lt1z350

iTrader: (2)

car has 11.0 to 11.5 afr all the way through on 5 or 10 lbs and feels pretty dang good but after racing a bike last night i got back to the hang out and opened the hood and all was cherry read near clear looking from the heat. dont think this is normal. way too much heat but why. runs good engine temp is below 200 was even cool out last night and all exhaust pipes from the header to the down pipe were glowing red. after 3 runs on ten lbs it started to break up like blowing the spark out and i had blown out the collector gasket and pass header gaskets had melted out. i have aluminum ones and they melted. I am guessing egts are way to high and have no idea why if the afr is ok. timing? back pressure on system? even after cruising home and never going in to boost about 5 miles they were lit up when i pulled in the garage no where near like after i was racing but still had color to them. kinda scarry that much heat is under the hood. i raced a few 600s as no cars wanted to run and beat them on 5 lbs then a zx10 with mods wanted to stick up for his buddies and killed me on 5 lbs so i bumped it to 10 lbs and we were dead even. they were all shocked a car was haning with bikes and beating them. if I hadnt blown the gaskets i was going to go to 12 just enough to beat him but all the gaskets lettting go stopped that then i saw how hot it all was and was really going to be done. maybe normal but dont think so. help me out guys who are running a turbo and know. thanks one thing is boost is frickin awsome. better than a 200 shot. if this is the way it is wish i had done a supercharger.

5literTPIterror

yea i would be interested to know why this happened to, it happened to my car the other day to (TC-78).

i was wondering if the timing is a little too retarded......???
i have it locked at 34* but retarding 1*/1psi with 6AL BTM box...

lt1z350

iTrader: (2)

I am running 36 up to 100 kpa then drop to 26* at 5 lbs and down 22* by 10 lbs. so we are close to timing tables. I am trying to get turbotpi to send me his tables as his car runs really well. but no luck hearing back yet.

project89

iTrader: (1)

how thick of piping did u use?
were u doing runs back to back?

also i gave up on using gaskets on my crossover pipes and turbo inlet/downpipe flanges, the green thich or red thick paper like gaskets will last a while but they blow out. the aluminumones last a lil longer but as u found out once u get it nice and hot they dont last either.

i went to using no gaskets and just using copper seal on the mating flanges havent had a problem since, just make sure the mating surfaces are good and flat

lt1z350

iTrader: (2)

so the copper rtv by itself?thought about that but suck a pain to do the header to head and I built it myself and it wasnt the truest if you know what I mean. warped some when I welded it. might use mr gasket ultra seal with copper on it. I used the standard stuff mandrel bends from summit not very thick and the headers were headman 82 to 92 shorties that I cut up and made in to what worked so a cheap set and probably thin. I wish i would have coated it all now to help and if someone says it will enough to make it worth doing I will pull it all and coat it. yours glow. I did do a few back to back blasts but even if I do one run it glows. even the turbo exhaust housing that is cast is glowing red. i dont get it.

5literTPIterror

i was doing a couple of short burst back to back, but nothing extended....

as fars as gaskets, i have one 3-bolt collector style gasket on my crossover and i blew out a paper type, and replaced it with copper gasket and no problems yet at 7-10psi....

only like 15 miles on the setup tho.... quite a few boosted runs tho....
just my 2cents

project89

iTrader: (1)

i can get my .065 wall stainless headers glowing under high boost but its only a few inches of the primarys

yeah first time i used just the gaskets, that lasted about 3 runs

so then i used new gaskets and coated them with copper seal on both sides this held up a lil bit longer.
finally i was told to only use copper seal and i havent had an issue at all been like that for quite a while now

the only place i still use gaskets is headers to the heads, though im still waiting for those to go out on me

liek 5 liter said u can also try copper gaskets they work pretty dam good as well

theres a ton of things that can make ur headers glow but as seeing ur also making the turbine housing glow u deff need to get urself a good fast reading egt gauge

mount the probe within 1-3 inches of the ex port

could be timing
could be to much or to lil fuel
turbine side could be small
etc etc

327???

I think it's probably a combination of kind rich and kinda retarded(the timing).

lt1z350

iTrader: (2)

ok what is a good afr for boost? total timing for 5 lbs and 10 lbs.I know it will be dif for each engine or really head style and i have afr 195 which are known for not needing a bunch of timing.I just took the header off the driver side and the actually look at what happened.

lt1z350

iTrader: (2)

i just ordered some percys xxcarbon turbo gaskets from summit. good up to 2000 degrees they say so if good i will let every one know. I got two sets as they are only 14 bucks . was going to try copper but didnt see it being better than the aluimnum ones i just smoked. I got v-band clamps to go in place of the 3 bolt collectors . just have to cut and reweld no big deal if they never leak.

Batass

That much fuel and very late timing can cause a lot of fuel to burn in the exhaust. 11:1 is the richest you want to go, any more isnt saving detonation. Timing shouldn't be much less than 25 degrees either.

lt1z350

iTrader: (2)

well after i get all these gaskets and flanges fixed I will shoot for 11.5 and bump the timing up some. I had it as high as 30* and it never detionated but everyone said it was way to high. I was at 12.0 and 30* and car felt really good on 5lbs but i never looked under the hood to see if it was glowing during those runs. It was during the day and this was the first night time run. It even melted 5 plug wires with the heat shields that night.

Batass

At 5lbs you should only have to pull 4 degrees to be safe. I make about 9 psi and have run 30* non intercooled, didn't notice any detonation, car picked up a lot. It's scary though. I need to get my knock gauge hooked up, and it would do you good to get one.

10hp for every 2 degrees. So you've got a lot of power left.

lt1z350

iTrader: (2)

wow. when i get it back together I am going to try the 30 again at 5 lbs. I ran a zx10 this weekend that traped 137 at gainesville raceway and on 10 lbs and 20* timing stayed right on him from 40 to 120 or so. hate using od with that much power but have. thought it was a little week at 5 lbs though as i barley out ran a 600 that traped 125. this car ran 118 with same set up without boost and I had stock ported 113 heads and now afr 195 eliminators oh and compression is now 9 ish and was 11 ish to 1. actually may be closer to 9.5 to 9.8 now.

Batass

Thats cruising, and that turbo will support a whole lot more. Just remember when you run more boost to check your spark plugs after a run. Even though the wideband says 11.5:1, doesnt mean all cylinders are running at that. I'm not sure about the HSR, but some of those forward ram type manifolds have issues with the back four cylinders running lean.

Cylinder to cylinder conisistency is the key to running the best timing and afr. I was just watching "Pinks" at Gainesville.

lt1z350

iTrader: (2)

that was a cool weekend. I want to run my car but didnt have it done in time.I will next time they come here though. thanks for the advice. so far plugs look great.

lt1z350

iTrader: (2)

man got the headers off both sides and looks like not a bit of exhaust has run through them. No carbon residue in the pipe at all. Wipe it with a white towel an no black gets on it. That cant be good.

Batass

Is there any at the beginning of the exhaust pipe? Definitely getting too hot.

junkcltr

iTrader: (1)

I have been running the Percy XXCarbon since 2005. They work well, but you need a perfectly flat header flange for them to work right. I also re-torque after break-in. I blew one out before when I didn't re-torque.

It sounds like you have too little timing and are burning too much fuel in the exhaust and/or the turbine is too small creating too much back pressure.

327???

I've got a set of percys XXcarbon on my n/a camaro, they work great for me.

lt1z350

iTrader: (2)

timing was at 24* and afr was at 11.0. my ehaust housing is a .98 which I thought was good for that size. No not a lick of black any where in the ports. even the head doesnt have any. Kinda freaky since my afr was at 11.0.

junkcltr

iTrader: (1)

One other thing. It is not abnormal to have a glowing turbo and header after a run. That is why they are typically made out of stainless steel, thick mild steel, cast iron, or thin steel that is heavily braced and repaired when it cracks.

What size exhaust wheel is in that turbine?

lt1z350

iTrader: (2)

.96ar

327???

q trim, p trim, o trim,......?

lt1z350

iTrader: (2)

i think p. how do i find out this stuff on it. i got it used all I know it is a turbonetics ceramic ball bearing t-76 . no tag on it. i do think the guy i got it from said it had a p trim