Imadude_134

iTrader: (9)

Is it possible to get an L98 TPI down into the 10 second range without Stealthram/Miniram/Superram and without upping the dis?

Basically, can a 3rd gen f-body make it to 10 seconds on a 350 LTR TPI setup?

Thanks in advance for the insight

-Tim-

Matterform

. . .dude
Hi I'm a reasonably new person/poster here on tgo, and could not let this one get by me. Yes you can make an ltr set up go 10's, but there is a necessary turbocharger set up in the mix.
There is a guy on the turbomustang site which did this on a jy longblock while his 'special race motor' was being prepared. He called this special project the 'grenade', fully expecting to blow the thing all over the track at some time. But the did it right, great tune, fuel and spark in the proper places at the proper time, good suspension-not great suspension and a couple of needing to be rebuilt GN turbos.
I think the final result was that he was in the 9's (mid-hi) at pushing a buck forty-ish.
Most of the readers were anticipating that he would pop the thing, and most expectged that it would. With a good tune, surprisingly , it held. Hi mile jy longblock, not even 1.94 valves, ltr tpi, and I believe amazingly stock.
His psi was around 20, and with a 50 shot it was around 25, and I believe his timing was around 20*.
So t answer your Q about 10 sec. et's, my answer is yes, this is just one way to do it, and with cast pistons no less. Just a great tune. If you can find the thread, it has to be one of the greatest on the internet for our hobby, more laughs than I can remember, and no blown engine.
Have a great day
Bill

Viprklr

iTrader: (5)

Anything is possible. Even with a true "TPI" it's possible. How much money do you have?

I've had people here tell me that you can't get 500 fwhp out of a "TPI" without forced induction or juice. I'm gonna prove 'em wrong. All I have left to do is tuning.

Orr89RocZ

iTrader: (20)

i would say it would be possible in a gutted out race car if its gonna be n/a

you can siamese the TPI and make it more short runner but then its not a "TRUE" LTR setup but still could be possible.

Guy on here has made 350whp with a siamesed setup on a 355. cam was fairly small tho. could go up a step and probly get up to 370whp. combine that with a ultra light car and you may crack 10's LOL

but other than that its gonna take forced induction or nitrous

its probly gonna take 420-450whp to touch 10's in the right car

1989GTATransAm

iTrader: (3)

Hey Viprklr I will be on the dyno by December so you need to get a move on if you are going to be first.

joeblue83

iTrader: (8)

Its gonna take way more than 420 horse to get into the 10's. I am making 470 and can barely get into the 11's. To get into the 10's with a pretty stock TPI your gonna need forged internals, a turbo or supercharger, and or a 200 shot of the juice. I have heard a guy in the high 9's with something like that. But if you were to do all that you would spend a lot that being both the motor and the chassis, cooling system.

Orr89RocZ

iTrader: (20)

i was talkin about 420 at the wheels which is probly near 500 on motor and for that power it will take a lightweight car with perfect suspension/converter combo to squeak 10's

Viprklr

iTrader: (5)

Crap. Slow down. I have to be first. Are you going to have your FIRST intake on though?

Orr89RocZ

iTrader: (20)

500 Fhp will be very interesting to see. should dyno very high 300s to low 400's depending on trans etc. that will be a stout TPI. i thought it could be done on a big 383-406 or something but never on a 355

Street Lethal

iTrader: (16)

Hey Tim, I posted this video once before (it's the Black C4 in the far lane), and although it's pushing more than 350 cubic inches, it is in fact using the stock TPI system during this run, so your 10 second goal for your third gen should easily be attainable w/the proper gearing, suspension, race weight (and power adder, if applicable), using the stock TPI setup....

As for 500-FWHP with the stock TPI system, naturally aspirated... it'll be tough to do, but with a power adder, you'll easily hit that mark. Good luck!

1989GTATransAm

iTrader: (3)

Viprklr, yes it is basically all done. Working on the monoblade right now to make it "smog legal" so to speak. Going to see how close I can come to 500hp at the motor. As to a 10 second car maybe with a 100 to a 150 shot I might be able to do it.

kowboy59

iTrader: (8)

Hahaha. I'm a college kid and I realized that buyin a miniram and doin other stuff is easier and cheaper than doin a TPI. But i always wanted to do it. I know an article in Chevy Hiperformance that did a TPI 383 like almost 500 hp and 500tq.

355tpipickup

iTrader: (5)

for the guys on this thread that are lookin to hit 500fhp what are you runnin fr a cam/heads.....will it pass emmission? i also would like to build as much power as i can from a LTR setup. juts need to find the right cam that will pass.

Orr89RocZ

iTrader: (20)

my thoughts on a LTR setup for 500 fly wheel hp are big inches, best heads money can buy and a cam that will have massive lift.

something i'd like to see is a 406+ inch chevy with ported 195-200cc heads that flow near 280-300cfm if possible at 600 lift and a cam that gets lift near that high. Something like an XFI 230-236 with near 580 intake lift. that should act good in a big inch TPI motor. Could possibly go 236/242 custom XFI as well but i think that would rev to much for a LTR. for LTR it have to be the biggest ported runners you can get with a matched base. extrude honed, maybe even a welded up base so you can open up the pinch point on TPI bases right where it goes into the runners/heads. You have to flow a theoretical 245 cfm to support 500hp but we all know theory is under estimating the reality. its probly gonna take a good 260cfm atleast probly more. not sure i've seen many TPI setups if any at all flow that much. I believe the welded up intakes can flow pretty good tho.
the HSR flows 275cfm and is said to max out near 400whp on most applications. TPI I dont think has the potential to make much more power than that on a BIG inch motor.

I'd love to see a 383 do it tho. i just have my doubts since TPI cant support the RPMS needed to make that power as a miniram/hsr can.

and i dont think it would pass emissions tho

Viprklr

iTrader: (5)

My combo, as of yet untested, consists of:

Stock TB for now
AS&M runners gasket matched
Bigmouth base gasket matched
AFR 195 Eliminators
Comp XFI custom 224/230 .566/.570 112 incl 1.6rr

All sitting on/in a 383 now. Melted a piston in my 350.

DD2K puts me at 534hp/540lbft at a peak horse value of 6K. (which I can spin). Just need to tune more before going to the dyno for the hard proof.

Orr89RocZ

iTrader: (20)

i cant wait to see how that combo runs.. i think its good enough for 500 crank if the intake is good, like an hsr or miniram. then again teh cam is abit smaller than i'd go. 280xfi would be nice to see. will a tpi feed it? hard to say, i think you will be a bit short

Imadude_134

iTrader: (9)

What would be possible to hit 11s with LTRs NA without nitrous?

Viprklr

iTrader: (5)

The cam was ground for my 350 not the 383. I figured i'd might as well still use it since it only had 150 miles on it. By using it, it also gives me another option for increasing hp when i get bored.
Same deal with my headers. 1 5/8 LT's. I should be running 1 3/4. At least I have other avenues to pursue in the future.

Orr89RocZ

iTrader: (20)

yep there is some hp in those two areas. i'd love to see how that cam runs, i'd love to run that on my 350 HSR but i'm worried about the mileage of the motor. may need a rebuild first

Viprklr

iTrader: (5)

It's got a bit of a lope.
The cam seems to be running quite nicely. Acceleration from 80-135 is the same as if I was accelerating from 40-80. No noticeable dropoff. Haven't seen the need to go over 135. Country driving has it's benefits.

Orr89RocZ

iTrader: (20)

indeed! lol

Imadude_134

iTrader: (9)

I wouldn't know... The closest thing that I have to country driving is those dumb posters of trees the city hung on the walls of the freeways...

California sucks sometimes...