Justin 87 GTA

iTrader: (3)

For those of you who know me, how have you been? I have been working too much lately so I havent been around. And most of you know that my season ended shortly after it started in July due to a bottom end knock. Anyway, I am in the process of pulling the motor. The specs of my old motor are below and detailed on my link. Anyway, I am keeping the Vortech, the trick flows and the superam. My goal is solid 11's on pump gas. I'd like to remain emissions legal (to pass the test), streetable and DURABLE. I was looking at a change to Speed Pro forged 8.1:1 pistons, and a blower cam to match the Superam and Trick flows, while keeping in mind my emmsions, streetablity and durability goals. Again, i must have atleast solid 11's at 115mph or above. I want to do the rebuild as cost effective as possible, w/out building a POS. This means that I want to re-use any parts that i can. i.e.: crank, rods or whatever else in the bottom end. The pistons I was looking at were only $300 and good bearings which i probably need are $85. Anyway, I would like some PROVEN formulas for what I want to do. Does anybody have any similar setups that my Superam, Trickflows, Vortech, inj, and everything else I have will work with? MY details are on my website, link below. I know that before I blew it up, the car was at very least mid 12's, not really tuned and had the wrong cam and whatnot. I raced a freind's high 12 Camaro many times and beat him w/ the 10 lb pulley. Anyway, please take a good look at what I have written, and if you think you can help, please make some detailed suggestions w/ proven formulas below. I would really appreciate it. I was thinking about using the 15lb pulley I have if I can (if not the 10lb). Also using somethin like the LPE 220 cam, w/ 8.1:1 pistons. It sounds like a good match for the heads, intake and blower, however, I can only guess what it might run. I am considering going over to DFI or something also, but would rather not just yet. I am aiming to assemble the motor myself. I pretty much want to stay around $1,500 for bearings, pistons, custom camshaft, and any block/crankwork I might need. Again, I have all the old parts, it's just that the bottom end is knocking, so I will reuse what i can. the motor is a '80-85 350 .30 over. .10under crankshaft. and only has about 20k on it. It's really clean, everything is near new and aftermarket. THANK YOU VERY MUCH, ANY HELP IS GREATLY APPRECIATED.
BTW, how are you Don and TTA 850???? How are the cars??? I'll be waiting for your replys to this one. You knew I blew it up, right? Boy was it running good before I did though!!! later I'll e-mail you.

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Disabled SUPERCHARGED 87 GTA: Blk/Gld w/Superam, 355cid Trickflows, forged pistons 9.5:1. Auto 2,600 stall, 3.45 9 bolt disc, Best ET (Nat. Asp.): 13.567 @ 101.900 w/ a poor 60ft. Best mph: 104.3 -*100% NYS emissions legal*
http:// www.community.webtv.net/munks87/JustinsGTApage.com
VORTECH S-TRIM completed 7/9/01: 10 & 15 LB. Pulleys, HKS race bypass, serpentine swap. No ET: 8/26/01, Blew motor before track. Rebuild in progess. Beat a freinds 12.9 @ 108 Camaro by A LOT. EST. mid 12's as it was. Looking for 11's w/ new motor.


[This message has been edited by Justin 87 GTA (edited October 17, 2001).]

maniacc

Justin,

I still can't believe that my STOCK 350 has held up to to the abuse of 10#'s of intercooled boost, but so far so good.

But anyways, depending on what is causing your bottomend knock, there are many possiblities, so what part can be re-used may be limited. Personally, I would not go below 9.0:1 comp, keeping some of the low end power, also consider up-grading to forged crank.

I believe that with the combination that you have (at 15 psi) and the addition of a ATI 3-core intercooler. and a custom prom, you'd be in the HIGH 11's.

I dont think that with the DFI, you can remain emission legal, unless you piggy back it to the stock ecm.

later
larry




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MÅN¡ÅÇ ©
88 IROC 5.7 TPI
ATI procharger D1sc 10#'s boost, edelbrock TES, complete MSD ignition, Borla cat-back, KB subframe connectors, accel 24# injectors...and a few other go fast goodies

<b>Best E.T. 13.417 @ 106.89 mph.</b> on worn out street tires
http://maniac.megamania.com

SecretFormula

Justin,What's up?I was wondering where you have been.Yes,I knew you had a knock in the bottom end,Probably a spun bearing.It is very possible to have a 11 sec street car, and you can do it without spending a fortune.
Here is my old setup that I had when running 11.40's.

-355ci.factory block(not splayed or filled)
-factory reconditioned rods(ARP bolts are a must)
-TRW forged pistons(p/n L2441F30)
-Total seal rings(p/n909003091-8)
-Federal Mogul bearings
---HAVE THE ROTATING ASSY.BALANCED!!!---

-Trick flow heads(mild bowl work)
-TPIS ZZ9 cam
-Comp Pro magnum rockers(1.5int. 1.6exh.)
-Accel base
-SLP runners
-Stock ported plenum
-58mm throttle body
-Vortech S-trim(yours now 10-11psi
-30 lb injectors
-SLP 1 3/4 headers
-4" exhaust(home built with spintech)

At the time i was still running the 700r4 trans,with a 10" Ati converter.12 bolt with 355 gears.NO intercooler and stock computer with custom Prom.
If you are looking for a good ET,Spend your money on a good trans,converter,rear,and a set of ET Streets or drags.Good times are soon to follow!
Shoot me an e-mail sometime dtb355@aol.com

Justin 87 GTA

iTrader: (3)

Thanks for the replies.
Don, what comp ratio were those pistons. Also, as far as the cam goes, would iI be even better off w/ a cam specifically designed for blowers & emissions? The zz9 isn't the best choice,...is it? Also, the tranny will remain as it is for now, and i have a deacent converter, the rear will remain 3.45 untill it breaks. I can't afford to build this up too much. Just want to fix my motor, and make it a little faster. thanks-justin

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SUPERCHARGED 87 GTA: Blk/Gld w/Superam, 355cid Trickflows, forged pistons 9.5:1. Auto 2,600 stall, 3.45 9 bolt disc, Best ET (Nat. Asp.): 13.567 @ 101.900 w/ a poor 60ft. Best mph: 104.3 -*100% NYS emissions legal*
http:// www.community.webtv.net/munks87/JustinsGTApage.com
VORTECH S-TRIM completed 7/9/01: 10 & 15 LB. Pulleys, HKS race bypass, serpentine swap. No ET: 8/26/01, Blew motor before track. Rebuild in progess. Beat a freinds 12.9 @ 108 Camaro by A LOT. EST. mid-low 12's as it was. Looking for 11's w/ new motor.

SecretFormula

With 63 cc chambers,the compression came to 8.7-1.The car had great street manners.
The ZZ9 cam may not be the best choice for you(with the Super Ram)but seemed to work well with my combo.I was just telling you what I had,take it for what it's worth. You may want to talk with Lingenfelter about a cam,He has done a lot of boosted Super ram cars. Later,Don B.

Justin 87 GTA

iTrader: (3)

so w/ 66cc heads, it should be around 8.4:1 right. I guess that's better than the 8.1:1 pistons, but can I run the 15lb pulley??? Do you know how to get a hold of Lingenfelter? I always get his reps, who don't know jack, and they're gonna just say get the LPE 220 cam.. I mean that cam sounds like the right one, but is it? anyone?

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SUPERCHARGED 87 GTA: Blk/Gld w/Superam, 355cid Trickflows, forged pistons 9.5:1. Auto 2,600 stall, 3.45 9 bolt disc, Best ET (Nat. Asp.): 13.567 @ 101.900 w/ a poor 60ft. Best mph: 104.3 -*100% NYS emissions legal*
http:// www.community.webtv.net/munks87/JustinsGTApage.com
VORTECH S-TRIM completed 7/9/01: 10 & 15 LB. Pulleys, HKS race bypass, serpentine swap. No ET: 8/26/01, Blew motor before track. Rebuild in progess. Beat a freinds 12.9 @ 108 Camaro by A LOT. EST. mid-low 12's as it was. Looking for 11's w/ new motor.

SecretFormula

Justin,you will be able to use the 15# pulley with 8.4-1 compression.You will need to keep a close eye on the a/f ratio.I would suggest using that pulley at the track,with race fuel,and the 10# pulley on the street.
Just my .02

Justin 87 GTA

iTrader: (3)

Yeah, that's what i'd like to do. So, I'll probably go w/ those pistons then, now I just have to figure out how to pic the right cam. Suggestions????? thanks. I tried calling you last night, line was busy. later -Justin

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SUPERCHARGED 87 GTA: Blk/Gld w/Superam, 355cid Trickflows, forged pistons 9.5:1. Auto 2,600 stall, 3.45 9 bolt disc, Best ET (Nat. Asp.): 13.567 @ 101.900 w/ a poor 60ft. Best mph: 104.3 -*100% NYS emissions legal*
http:// www.community.webtv.net/munks87/JustinsGTApage.com
VORTECH S-TRIM completed 7/9/01: 10 & 15 LB. Pulleys, HKS race bypass, serpentine swap. No ET: 8/26/01, Blew motor before track. Rebuild in progess. Beat a freinds 12.9 @ 108 Camaro by A LOT. EST. mid-low 12's as it was. Looking for 11's w/ new motor.

'91 Formula

iTrader: (1)

Justin 87 GTA..The bigest problem I see is you getting 15lbs of boost with the stock 6 rib pully setup. I used a 3.125 pully and only got 9lbs of boost. I used to get 12lbs with my 3.33 pully. I lost boost due to the loss of surface area of the smaller pully. I now switched to an 8 rib. I do not know if it helped yet because I have not driven the car yet due to another project I am working on. I'll keep you posted.

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'91 Formula
383CI Superram, Sportman II's
SLP Cam 214/224 .470/.490
Vortech V1 S-Trim
5-speed
3.42
12.34@117.04, 1.91 60Ft.
on Drag Radials

Justin 87 GTA

iTrader: (3)

well, i got 10lbs, already and I have a smaller pulley, that should make 15. the guy I got it rom had no problem making 15. keep me posted. thanks -Justin

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SUPERCHARGED 87 GTA: Blk/Gld w/Superam, 355cid Trickflows, forged pistons 9.5:1. Auto 2,600 stall, 3.45 9 bolt disc, Best ET (Nat. Asp.): 13.567 @ 101.900 w/ a poor 60ft. Best mph: 104.3 -*100% NYS emissions legal*
http:// www.community.webtv.net/munks87/JustinsGTApage.com
VORTECH S-TRIM completed 7/9/01: 10 & 15 LB. Pulleys, HKS race bypass, serpentine swap. No ET: 8/26/01, Blew motor before track. Rebuild in progess. Beat a freinds 12.9 @ 108 Camaro by A LOT. EST. mid-low 12's as it was. Looking for 11's w/ new motor.

superstreet

Justin 87 GTA,belt slippage is a big problem if you want to run 15 lbs of boost.I had a custom set of 12 rib serpentine pulleys made up and was only getting 8 lbs on the line and 12 down the track (the pulleys are set up for 27 lbs).When I got back to the pits there was black rubber dust every where.Any who, had a set of cogs made up pretty cheap (about $450,crank and blower pulley and idle pulley) through ASP racing.First pass it made a 60' time of 1.38 with a 2 1/2 foot wheelie,but it sheared the crank key.It might be worth to go to cog pulleys to make serious power.Do it right the first time,unlike me,now I have a set of 12 rib pulleys that I spent $600 collecting dust!

mcconahay37

iTrader: (3)

What do you guys mean by cog pullies?

superstreet

Cog pulleys have teeth on them and the belt has teeth that mesh with the pulleys like the top fuel cars have.There is NO belt slip what so ever.The ONLY way to make serious power with a high boost supercharger application.

Tom Simpson

how do those belt systems hold up on the street though?

superstreet

I have never used them on the street,but if the crank pulley and the supercharger pulley are "in line" and square with each other and there is no bracket deflection (it might have to be reinforced?) I don't see a problem.

TTA850

Justin whats up,sorry I can't give any advise unless you decide to go V-6

Gimme a call we should get together oh and BTW the motor is in the car,there are pics on my website www.tta850.com and I should be knocking on the 9 second envelope next spring

Hopefully

Steve

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1989 Turbo Trans Am's #124 and #850
1989 Turbo GTA,600hp 3.8L SFI TURBO
2001 Kawasaki ZX-6R
www.tta850.com

TTA850

Oh btw I totally agree with superstreet,thats the setup I wanted to use when I was gonna go with a supercharger years ago,no belt slip at all.

Steve

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1989 Turbo Trans Am's #124 and #850
1989 Turbo GTA,600hp 3.8L SFI TURBO
2001 Kawasaki ZX-6R
www.tta850.com

Justin 87 GTA

iTrader: (3)

I'll try to call you tonight

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SUPERCHARGED 87 GTA: Blk/Gld w/Superam, 355cid Trickflows, forged pistons 9.5:1. Auto 2,600 stall, 3.45 9 bolt disc, Best ET (Nat. Asp.): 13.567 @ 101.900 w/ a poor 60ft. Best mph: 104.3 -*100% NYS emissions legal*
http:// www.community.webtv.net/munks87/JustinsGTApage.com
VORTECH S-TRIM completed 7/9/01: 10 & 15 LB. Pulleys, HKS race bypass, serpentine swap. No ET: 8/26/01, Blew motor before track. Rebuild in progess. Beat a freinds 12.9 @ 108 Camaro by A LOT. EST. mid-low 12's as it was. Looking for 11's w/ new motor.