tpi guys

[Draven94blackbird]

hey guys, i was thinking of converting my 305 tbi to a 350 tpi with some other mods. i Would like to know what kind of numbers you guys are puting out(power, torque and 1/4) on stock and mod cars. please tell what you have done to it if not stock and tell if it is (Realy)street leagel. Im would like to keep mine as a daily driver, so am tring to see were i can go with this. also what do you guys suggest. it would be a ground up rebuild so options are still avalible to me. thanks

[enRo]

With a full bolt-on L98, and gearing, and some minor weight reduction, you can see high to mid 14's, maybe lower. Go check out TGO's TPI Section (http://www.thirdgen.org) where you will find everything, anything, and any questions you have, and use the "Search" at the top of the forums. They are alot better help over there.

[The Fixer]

With a full bolt-on LB9, and gearing, and some minor weight reduction, you can see high to mid 14's, maybe lower..

I fixed your quote. :) If you've got a full-bolt-on L98 running mid 14's, it's only running on 6 cylinders. I've run a 15.0 @ 90mph on a wheel-spinning 2.6 second 60' with my cammed TPI 305 (aka LB9). A cammed 350 TPI (L98 ) car should have no trouble knocking off mid-low 13s, and still be completely driveable and emissions-legal. Add in some good heads, a better flowing intake (like a Stealthram) and you'll be cooking!

[Teds89IROC]

I have new stock heads, flowtech shorty headers, hi-flo cat, magnaflow cat-back, TB coolant bypass (probably not much of a difference), a.i.r. tube delete (again, probably no real gain..it was more of a convenience thing), smog pump delete (better throttle response), MSD blaster coil, MSD 8mm wires. Thats pretty much it as far as power mods. I made 210 rwhp and 300 rwtq. Those flowtechs are ****** and I'm willing to bet that they held back some hp, not only because of their design and size, but because I had/have leaks. For a DD, I'd go with hooker super comp shorties..as for me, I'm going with super comp LT's as soon as I get some cash. I didn't run the 1/4 yet, but I have a few mods that will help out my time when I do run... I put in a 3.42 posi rear to replace my old 2.77's and I also have SFC's, LCA's and LCA relocation brackets that I still need to install. My friend Steve has an 89 GTA with the 350 TPI. He has edelbrock TES shorty headers, flowmaster cat-back, hypertech chip, MSD ignition box, boxed LCA's, 3.27 posi rear, and roller rockers. He ran a best of 13.7 in the 1/4

~Ted

[Teds89IROC]

forgot to mention..Steve's car is fully street legal, mine would be if it weren't for leaks and my uncertainty with the hi-flo cat that is on there. Once I get collectors insurance/registration and the LT headers, I'm ditching the cat.

~Ted

[Batman]

I fixed your quote. :) If you've got a full-bolt-on L98 running mid 14's, it's only running on 6 cylinders. I've run a 15.0 @ 90mph on a wheel-spinning 2.6 second 60' with my cammed TPI 305 (aka LB9).

Cammed is not bolt on....and for the kind of money re-doing a tired 350 and then getting a stealth ram, etc, etc it is cheaper to get a crate engine. If you get a low mileage L98 and are happy with just the cam swap then you are golden. If you are planning on rebuilding it or buying heads etc etc get a crate engine.

**BTW GM HO 350, 330HP, 350Ft LBS, $2,800, only downside it has vortec heads**

[Teds89IROC]

true, but if you have the engine out of the car, its not too difficult to throw in a different cam before you drop it in.

~Ted

[Batman]

That's what I am saying, if ther L98 is good enough to use as is that is an easy swap but you still have to take off the intake and such.

[Teds89IROC]

whats wrong with vortec heads? 20-40hp increase over earlier stock heads. plus they can still be ported and flow better.

~Ted

[Batman]

whats wrong with vortec heads? 20-40hp increase over earlier stock heads. plus they can still be ported and flow better.

~Ted

Different bolt pattern then the TPI, nothing performance wise wrong with them. They are awesome heads. Just need a different intake manifold.

[Teds89IROC]

oh, yea I know about needing a different intake...by you saying its a downside I thought you meant that the head itself wasn't good. I gotcha now

~Ted

[Batman]

Nope, just adds some cost

[misterjuice]

is a supercharger considered bolton???? ;)

[Koll]

With whats in my sig I run a best of...I think 14.5 My best 60' is 2.1. Hopefully with everything back and working now I should be around 14.2 ish

[JSPERFORMANCE]

88 Firebird T5, 355 tpi, GM block, GM Heads, GM upper, GM lower, and GM runners.. best 11.87 @ 113 3610lbs race weight

[Ian]

:shock:

any more specs on that? Is it huffing the laughing gas?

[The Fixer]

88 Firebird T5, 355 tpi, GM block, GM Heads, GM upper, GM lower, and GM runners.. best 11.87 @ 113 3610lbs race weight

Well, if you're in the 11s on a T5, I won't be as worried about mine after I swap in the 355. Whew!

[JSPERFORMANCE]

Sorry guys, can't tell yous ALL my secrets. ;-)