555 BBC twin turbo update
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#52
Re: 555 BBC twin turbo update
did a 1/8 mile tnt this weekend since the funny car nationals were in town. Made two hits since it was so busy and i got tired of waiting around.
first hit went 1.35 60 then top of first blew tires off. Track was hot and junk. Next pass left the same with a 1.34 60 and put in a slight delay and 2 lbs less boost, and short shifted first. Spun second slightly but went to third early i guess and it went down. Just a 5.44 at 137. 19.5-20 psi
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IROCThe5.7L (07-20-2021)
#53
Re: 555 BBC twin turbo update
Not a good year lol struggled at my home track due to good surface prep on a radial tire. The new concrete top layer is breaking loose and not holding anything with power. Managed a shitty 8.20 at 178 with a 1.4 60 and shorting 2nd bad. 19-20 psi
went to a superb track, Maryland international for radial prep tnt and broke rear end. Lol. Had trans issues too, rebuilt trans and put in a new 2.10/1.40 gear set. Got it back and had issues but tried it, wouldnt shift 1-2 on this hit
still managed 1.29 60 leaving on 5-6 psi
then left on 7 and bent torque arm, grenaded u joint and pinion yoke
went to a superb track, Maryland international for radial prep tnt and broke rear end. Lol. Had trans issues too, rebuilt trans and put in a new 2.10/1.40 gear set. Got it back and had issues but tried it, wouldnt shift 1-2 on this hit
still managed 1.29 60 leaving on 5-6 psi
then left on 7 and bent torque arm, grenaded u joint and pinion yoke
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skinny z (01-07-2022)
#57
Re: 555 BBC twin turbo update
Got a nice bulletproof 9” in car. Midwest chassis did a nice job.
maxed car out today. 27 psi and no more power above that lol happy although i was hoping they had more in them. I figured 120 lbs min nearer 2k hp but oh well
maxed car out today. 27 psi and no more power above that lol happy although i was hoping they had more in them. I figured 120 lbs min nearer 2k hp but oh well
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IROCZman15 (07-30-2022), midias (08-10-2022), skinny z (07-30-2022), TallTim (04-12-2023), vorteciroc (07-30-2022)
#58
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Car: 1987 IROC-Z
Engine: 406 on N20 w/ EFI
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Re: 555 BBC twin turbo update
I saw this video pop up on my youtube subscription to your page.
WOW. Those kind of power numbers are so far out of my realm of reality that all I can really say is WOW; incredibly impressive. You rock !
WOW. Those kind of power numbers are so far out of my realm of reality that all I can really say is WOW; incredibly impressive. You rock !
#59
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Car: Resto-Mod 1987 IROC-Z Clone
Engine: Alky fed L92 Vortec Twin-Turbo 6.8L
Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: 555 BBC twin turbo update
Got a nice bulletproof 9” in car. Midwest chassis did a nice job.
maxed car out today. 27 psi and no more power above that lol happy although i was hoping they had more in them. I figured 120 lbs min nearer 2k hp but oh well
https://youtu.be/lCSWUDsZwdM
maxed car out today. 27 psi and no more power above that lol happy although i was hoping they had more in them. I figured 120 lbs min nearer 2k hp but oh well
https://youtu.be/lCSWUDsZwdM
Do you have any Images of the Frame/ Uni-Body work...?
I'd like to compare it to what I have been doing.
I have not put more than 1,400 to 1,500 to the Wheels in a Customer's 3rd-Gen.
Everything with more HP that I have built has been a Back-Half Car, if not a Tube-Chassis Car.
Thanks in advance!
#60
Re: 555 BBC twin turbo update
I love it!
Do you have any Images of the Frame/ Uni-Body work...?
I'd like to compare it to what I have been doing.
I have not put more than 1,400 to 1,500 to the Wheels in a Customer's 3rd-Gen.
Everything with more HP that I have built has been a Back-Half Car, if not a Tube-Chassis Car.
Thanks in advance!
Do you have any Images of the Frame/ Uni-Body work...?
I'd like to compare it to what I have been doing.
I have not put more than 1,400 to 1,500 to the Wheels in a Customer's 3rd-Gen.
Everything with more HP that I have built has been a Back-Half Car, if not a Tube-Chassis Car.
Thanks in advance!
#62
Re: 555 BBC twin turbo update
na power could do both and be happy. But the hub is easier to get on and off. If you are tuning for long endurance like a road race or standing mile car, hub is the way to go. Literally can lock it down at any rpm at wot for however long you want
#64
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Car: Resto-Mod 1987 IROC-Z Clone
Engine: Alky fed L92 Vortec Twin-Turbo 6.8L
Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: 555 BBC twin turbo update
I was going to be helping my Son get a Business going... but that will not be happening.
I need some kind of Shop.
I am thinking of just opening a Hub-Dynomometer Shop.
I had an AWD Chassis Unit before and hated it.
I do want an Engine Unit again though...
I need some kind of Shop.
I am thinking of just opening a Hub-Dynomometer Shop.
I had an AWD Chassis Unit before and hated it.
I do want an Engine Unit again though...
#66
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Car: Resto-Mod 1987 IROC-Z Clone
Engine: Alky fed L92 Vortec Twin-Turbo 6.8L
Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: 555 BBC twin turbo update
LOL!
The following 6 users liked this post by Orr89RocZ:
aliceempire (04-12-2023), Buddy (04-12-2023), LB9GTA (04-12-2023), skinny z (04-11-2023), Speedfreak391 (12-13-2023), and 1 others liked this post.
#69
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Car: 91 Z28
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Re: 555 BBC twin turbo update
And another youtube I'm subscribed to, thats some nice numbers.
The red line at the top of the pull looks interesting, is that a converter lockup or something else?
The red line at the top of the pull looks interesting, is that a converter lockup or something else?
#73
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Car: 83 3rd gen
Engine: 540 BBC
Transmission: TH400
Axle/Gears: 9 inch 3.7 full spool
Re: 555 BBC twin turbo update
is there a link to your build? I'm running a nitrous 540 in mine atm. About to switch it all to twin turbo EFI. But really struggling to workout where to put the turbos. Seen how yours are mounted and am thinking this might be a really good option. Already having 2.25 inch runners into 4inch collector headers would save me some big headaches with manifolds.any help or advice would be appreciated.
#74
Re: 555 BBC twin turbo update
Not really any build threads but some posts i think were made. Pretty straight forward. Basically like any na engine swap/build but turbos in back seats lol
i can say you dont want or need large piping. 4” is way big for collector. Id shrink that down if you can. Even if you have to taper it thats fine. No bigger than 3” to turbo. Maybe even 2.5” depending what you want out of it as far as power and spool time lol but alot of that can be decided in the turbo specs and housing ar
i can say you dont want or need large piping. 4” is way big for collector. Id shrink that down if you can. Even if you have to taper it thats fine. No bigger than 3” to turbo. Maybe even 2.5” depending what you want out of it as far as power and spool time lol but alot of that can be decided in the turbo specs and housing ar
#75
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Car: 83 3rd gen
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Axle/Gears: 9 inch 3.7 full spool
Re: 555 BBC twin turbo update
Not really any build threads but some posts i think were made. Pretty straight forward. Basically like any na engine swap/build but turbos in back seats lol
i can say you dont want or need large piping. 4” is way big for collector. Id shrink that down if you can. Even if you have to taper it thats fine. No bigger than 3” to turbo. Maybe even 2.5” depending what you want out of it as far as power and spool time lol but alot of that can be decided in the turbo specs and housing ar
i can say you dont want or need large piping. 4” is way big for collector. Id shrink that down if you can. Even if you have to taper it thats fine. No bigger than 3” to turbo. Maybe even 2.5” depending what you want out of it as far as power and spool time lol but alot of that can be decided in the turbo specs and housing ar
also I saw that you were just open in the back seat, where are you drawing air from?
I've essentially got pretty much same as what you do in ice box and stuff. Which when i saw your setup seems ive found a run around. For exhaust ove got 2 different ones already. I have a twin 4 inch system that ends with black widow neighbor haters. (Way to damn loud even compared to open pipes.) And a 3inch setup which I can cut down to use which sounds like will be the plan. How dod you brace the turbos? Just made a frame to mount supports? Sorry for all the questions, but any help/pictures would be greatly.appreciated.
(Added pic of current engine setup.)
#76
Re: 555 BBC twin turbo update
Oh man. Lol 1400 at the tire is practically pump gas for me. Its made that on 15 psi. I run e85 but have run 93 to 12 psi. You’ll like it. Turbo motor will live along time
i can share some stuff later tonight. Maven makes mounts that the turbo bolts to. Made a frame across the seat area to mount them. Then enclosed them in a sheet metal box. Its not perfectly sealed. A lot of air comes in from under car. No issues there. It wont drain your interior oxygen supply like some ppl thought haha
exhaust is 3” down the trans tunnel area. Clearance is ok. Trans subframe area is the lowest point. Headers have 3.5”’collector on mine tapers to 3” with a transition cone. Pretty straight forward like any long tube header swapped dual exhaust thirdgens
4” downs over axle. Plenty of space.
i can share some stuff later tonight. Maven makes mounts that the turbo bolts to. Made a frame across the seat area to mount them. Then enclosed them in a sheet metal box. Its not perfectly sealed. A lot of air comes in from under car. No issues there. It wont drain your interior oxygen supply like some ppl thought haha
exhaust is 3” down the trans tunnel area. Clearance is ok. Trans subframe area is the lowest point. Headers have 3.5”’collector on mine tapers to 3” with a transition cone. Pretty straight forward like any long tube header swapped dual exhaust thirdgens
4” downs over axle. Plenty of space.
#78
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Car: 83 3rd gen
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Re: 555 BBC twin turbo update
Yeah ive had a turbo SBC years ago back in australia. That thing was nuts we made 1583 to the tyres out of a 383 on 36lbs. Yes we found the limits of the block, trans and rear end multiple times 🤣🤣 but it was a fun ute.
As for the 3rd gen I've ran it on 116 but with just a 600 shot on a single kit its all at its limits and is just so hard on parts. I've had all the efi and turbo stuff sitting there waiting just coukd never find any real info for manifolds that didn't involve cutting up the whole front end. Mines still not even tube front, but I am thinking of swapping out to the rack and pinion swap and tube front just for weight.
just brought some double bead locks from weld and a kit to relocate to the coil overs i have. This motor was built with the intention of big power hence its copper head gasket and o ring blocked, recently had a custom cam ground by Straub technologies suited to my whole combo with these turbos. So with now finding this information from you its time to turn the wick up and chase that number and hurt some more feelings. My last time out they told me don't come back with a bottle and no chute lol. It pulled up fine but the 165mph was the no no with no chute hahahahaha.
appreciate the information mate. This has me inspired to get it out of the trailer and in a workshop LOL.
As for the 3rd gen I've ran it on 116 but with just a 600 shot on a single kit its all at its limits and is just so hard on parts. I've had all the efi and turbo stuff sitting there waiting just coukd never find any real info for manifolds that didn't involve cutting up the whole front end. Mines still not even tube front, but I am thinking of swapping out to the rack and pinion swap and tube front just for weight.
just brought some double bead locks from weld and a kit to relocate to the coil overs i have. This motor was built with the intention of big power hence its copper head gasket and o ring blocked, recently had a custom cam ground by Straub technologies suited to my whole combo with these turbos. So with now finding this information from you its time to turn the wick up and chase that number and hurt some more feelings. My last time out they told me don't come back with a bottle and no chute lol. It pulled up fine but the 165mph was the no no with no chute hahahahaha.
appreciate the information mate. This has me inspired to get it out of the trailer and in a workshop LOL.
#80
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Car: 83 3rd gen
Engine: 540 BBC
Transmission: TH400
Axle/Gears: 9 inch 3.7 full spool
Re: 555 BBC twin turbo update
Yes s400 base 1.26 AR from memory each turbo is rated to 1500. I'll have to find the test sheets for all the specs. When I get to my storage unit when I get home from Vegas and start moving to my acreage I'll grab it all and let you know. The ones I have were just cheap ones that I found to get it running, then was going to upgrade to billet wheel larger AR if need be but i think this setup should be good for the limits of all of what i have currently. My block is only good for around 2500 unless I grout fill it. But I still want to drive it on the street so don't really want to go down that road. I may end up building another bottom end in the future with a stronger block. But for now this will achieve the next goal.
#81
Re: 555 BBC twin turbo update
Honestly thought i may have posted some pics of stuff but dont think i did
headers are 2.125” primary to 3.5” vband collector. Ceramic coated now no longer wrapped
see the maven mount for the turbo. Make it easy to mount the turbos. Oil drain goes thru it. Use big drains
oil supply and return are handled by remote oil system with two turbowerx exa pumps. Have a 3 way junction block to make a Back pressure style regulator to maintain oil pressure over 40 psi. 3 qrt tank for reservoir.
basically the jist of it. Cold side runs thru car beside seat and thru factory heater core hole in firewall lol.
i have a 9” rear now, old pic of 12 bolt. Had to redo the wastegate position slightly. They just dump to ground
headers are 2.125” primary to 3.5” vband collector. Ceramic coated now no longer wrapped
see the maven mount for the turbo. Make it easy to mount the turbos. Oil drain goes thru it. Use big drains
oil supply and return are handled by remote oil system with two turbowerx exa pumps. Have a 3 way junction block to make a Back pressure style regulator to maintain oil pressure over 40 psi. 3 qrt tank for reservoir.
basically the jist of it. Cold side runs thru car beside seat and thru factory heater core hole in firewall lol.
i have a 9” rear now, old pic of 12 bolt. Had to redo the wastegate position slightly. They just dump to ground
#82
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Car: 83 3rd gen
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Transmission: TH400
Axle/Gears: 9 inch 3.7 full spool
Re: 555 BBC twin turbo update
Something I just realised my headers are a two piece deal 2 pipes come through and down the inside of the wheel well to fit the larger diameter. But I can secure that up easy enough, I might have to make another set as these have a few years on them and the metal is getting bit thin. But when I'm not worried about room for rhe turbos that's not an issue lol
Thanks for the pictures and info, ill order those pumps thats a good way to go about it. Do you run any type of oil cooler for the turbo oil?
Thanks for the pictures and info, ill order those pumps thats a good way to go about it. Do you run any type of oil cooler for the turbo oil?
#83
Re: 555 BBC twin turbo update
I do. Just a b&m bar and plate cooler. I do not know what my temps are after driving around. Turbo oil pressure usually goes 60 cold and drops to 40 hot. I’ll have to measure temps. It does get fairly warm. I can still touch the reservoir tho lol so its not that hot. I may not actually need the cooler but im also not sure how much its helping since its just mounted flush to floor and likely isnt getting a ton of cross air flow
#84
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Car: 83 3rd gen
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Axle/Gears: 9 inch 3.7 full spool
Re: 555 BBC twin turbo update
I have a bunch of oil temp gauges from a burnout car i was building so not a big deal to put a temp gauge for it. The rest ill run through the holley system and 7inch dash.
Guess now I am going to have to work out the cam sync and crankshaft sensor setup and the smart coils 🤦♂️
Build racecars they said, it's fun they said. Doesn't cost much they said.... bahahahbahahahahahthe end of the day it's about smiles per gallon....
Guess now I am going to have to work out the cam sync and crankshaft sensor setup and the smart coils 🤦♂️
Build racecars they said, it's fun they said. Doesn't cost much they said.... bahahahbahahahahahthe end of the day it's about smiles per gallon....
#85
Re: 555 BBC twin turbo update
Id be curious how slip fit two piece headers would be for a turbo application. Double slip fits seem ok from what i read but never used them. System is under backpressure so always worried it would leak. I wanted slip on collectors to make it easier to install. And remove trans without taking headers out
anyway the good thing is you will use methanol. Reallly helps spool the rear mounts. Just no comparison. 1.26 ar should be good. I have 1.1 t4 and it still laggy on street. Not terrible on track but wish it was faster responding. Wanted to switch to pulsar ball bearings turbos lol i should just go straight methanol
anyway the good thing is you will use methanol. Reallly helps spool the rear mounts. Just no comparison. 1.26 ar should be good. I have 1.1 t4 and it still laggy on street. Not terrible on track but wish it was faster responding. Wanted to switch to pulsar ball bearings turbos lol i should just go straight methanol
#86
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Car: 83 3rd gen
Engine: 540 BBC
Transmission: TH400
Axle/Gears: 9 inch 3.7 full spool
Re: 555 BBC twin turbo update
You've got me all excited again lol. If I wasn't in the middle of moving to the 10 acres I just brought (where there isn't a shop built yet or a house lol) I'd be pulling the car apart where it sits in the trailer 🤣. But to move I need the car trailer empty and the car drivable still. Adulting sux at tines LOL.
if these turbos are to laggy, I'll swap them out pretty quick. They weren't expensive, so not overly stressed.
if these turbos are to laggy, I'll swap them out pretty quick. They weren't expensive, so not overly stressed.
#87
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Car: Resto-Mod 1987 IROC-Z Clone
Engine: Alky fed L92 Vortec Twin-Turbo 6.8L
Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: 555 BBC twin turbo update
Honestly thought i may have posted some pics of stuff but dont think i did
headers are 2.125” primary to 3.5” vband collector. Ceramic coated now no longer wrapped
see the maven mount for the turbo. Make it easy to mount the turbos. Oil drain goes thru it. Use big drains
oil supply and return are handled by remote oil system with two turbowerx exa pumps. Have a 3 way junction block to make a Back pressure style regulator to maintain oil pressure over 40 psi. 3 qrt tank for reservoir.
basically the jist of it. Cold side runs thru car beside seat and thru factory heater core hole in firewall lol.
i have a 9” rear now, old pic of 12 bolt. Had to redo the wastegate position slightly. They just dump to ground
headers are 2.125” primary to 3.5” vband collector. Ceramic coated now no longer wrapped
see the maven mount for the turbo. Make it easy to mount the turbos. Oil drain goes thru it. Use big drains
oil supply and return are handled by remote oil system with two turbowerx exa pumps. Have a 3 way junction block to make a Back pressure style regulator to maintain oil pressure over 40 psi. 3 qrt tank for reservoir.
basically the jist of it. Cold side runs thru car beside seat and thru factory heater core hole in firewall lol.
i have a 9” rear now, old pic of 12 bolt. Had to redo the wastegate position slightly. They just dump to ground
@Orr89RocZ I truly Applaud you! Excellent!!!
#88
Re: 555 BBC twin turbo update
Lol thanks. I tried. I wanted to be different but it just made more sense. Given the size and weight of both the bbc and s400 turbos, i just didnt want to put all that on the nose. Also there was no way to really run piping for exhaust out the back of the car. Dual 4” under car would be impossible unless ovalized. Too expensive and heavy
i wanted it easy to work on with good plug access. It turned out good. Car is super heavy tho and bit laggy for the street fun but i still like it
i wanted it easy to work on with good plug access. It turned out good. Car is super heavy tho and bit laggy for the street fun but i still like it
#89
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Car: 83 3rd gen
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Axle/Gears: 9 inch 3.7 full spool
Re: 555 BBC twin turbo update
What converter you running? I have a new one on my shelf i had custom built to suit these turbos and my engine combo (sent the guy all engine specs and the cam card for the turbo cam straub designed for me.) Is that why you feel lag due to to the converter? The guy that built mine builds converters and boxes for monster trucks and dirt drag cars aswell as drag cars, can send you his info if ya like.
#90
Re: 555 BBC twin turbo update
Car is 3870 with me in it
converter is a dusty bradford spec PTC 9.5”. Its the tighest 9.5 they make and its been doing good. Probably too loose now for my power lately but between 1500-1700 ish hp it was about right. It will flash to 3600-3700 if you mat it from idle. Closer to 3900-4000 on methanol lol
transbrake i try to set it to 4400-4600 rpm and it gets there fairly quick and within 2 secs its usually at 5-7 psi, a touch longer to get to 8-9. On methanol it was like 2 sec to get to 9-10. Much better on methonal than e85.
On the street from a roll it wont get to 12 psi til like 5500 rpm. Looser converter may help but its more of physical limitations of the turbine/housing and compressor inertia. Boost threshold is just higher than i wanted.
id like to upgrade to a dump valve and big input shaft in the trans, and get a 10” or so converter to get it abit tighter. Last outing it missed a shift because the rpm drop wasn’t enough to trigger the shifter. Alot of slip when it didnt have that problem on slightly lower power
converter is a dusty bradford spec PTC 9.5”. Its the tighest 9.5 they make and its been doing good. Probably too loose now for my power lately but between 1500-1700 ish hp it was about right. It will flash to 3600-3700 if you mat it from idle. Closer to 3900-4000 on methanol lol
transbrake i try to set it to 4400-4600 rpm and it gets there fairly quick and within 2 secs its usually at 5-7 psi, a touch longer to get to 8-9. On methanol it was like 2 sec to get to 9-10. Much better on methonal than e85.
On the street from a roll it wont get to 12 psi til like 5500 rpm. Looser converter may help but its more of physical limitations of the turbine/housing and compressor inertia. Boost threshold is just higher than i wanted.
id like to upgrade to a dump valve and big input shaft in the trans, and get a 10” or so converter to get it abit tighter. Last outing it missed a shift because the rpm drop wasn’t enough to trigger the shifter. Alot of slip when it didnt have that problem on slightly lower power
#91
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Car: 83 3rd gen
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Re: 555 BBC twin turbo update
Hmmmm interesting, wonder if the dump valve would make up for it pushing through the converter
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