lt1 vs tp1
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TECH Regular
Joined: Aug 2005
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From: Fort Worth,TX
lt1 vs tp1 who would win a tpi with lt headers,3.55,air foil,shift kit,CAI,58 TB and a cam or an lt1 with, true duals with lt headers,magnaflow catbacks,CAI,3.42,58 TB, im just wondering cus my friends wants to race me with his iroc.
What year IROC? Some of those TPI engines were 195-215 HP 305s. Even so, the L98 heads don't flow very well so even with his mods,those heads are going to choke it down. Most L98s dyno around 190-215 RWHP even with his mods you should take him.
How big is the cam? It will be a close race b/c the stock TPI system doesn't do well in the upper end range. It is very restricted. If any changes were made to it then I would say the TPI hands down.
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TECH Resident
Joined: Aug 2005
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From: SW Florida
sorry for hijacking the thread here, this is off topic a little...but my buddy had a 1992 Z28 Conv. and he is a really knowledgeable car guy, knows more than anyone my age. Anyways he was telling me one time it was a kind of rare car because of the motor it had I think..i can't really remember.....was there any special motor that was put in those 92 camaro z28's? I raced him with my 94 LT1 and from 55-130 he pulled on me by about a car length to my suprise, he did have the edge being he took off first and I had 3 people in my car too but I was shocked. My car did have 3.23s so it pulled hard down low, but when he started pulling away i was like WTF?? All he had was a Borla Cat Back I believe. I just can't remember what he told me so I thought I would ask.
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Joined: Jun 2004
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From: Romeoville, IL
If he's still running on the stock intake manifold that it will be a good race.
If he has aftermarket intake manifold then he's gunna beat ya.
As stated the intake manifolds on those cars really held them back bad, it was designed for the 305 TPI's, and created awesome low end torque, but they fell on their fast up top. L98's (350 TPI's) gain a great horse power increase with just switching out the intake manifolds. A popular swap these days is they actually put in a modified lt1 intake.
Mike
If he has aftermarket intake manifold then he's gunna beat ya.
As stated the intake manifolds on those cars really held them back bad, it was designed for the 305 TPI's, and created awesome low end torque, but they fell on their fast up top. L98's (350 TPI's) gain a great horse power increase with just switching out the intake manifolds. A popular swap these days is they actually put in a modified lt1 intake.
Mike
Launching!
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younggunls1 he forgot to tell you he was on a 200 shot not to be rude but I can sware to the bible I have never seen a tpi/l98 even cammed up go faster than a 15.5you know what I take that back there is 1 with a 250 shot running a 13.3
TECH Apprentice
Joined: Jun 2004
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From: Romeoville, IL
My buddys 87 IROC ran 13.8's @ 99MPH on nothing but your basic bolton's. He also ported his intake manifold and runners. And he was on nitto drag radials. 3.23 gears, stock suspension. Stock valvetrain, No pcm tuning either. I'll have to get him to post some time slips some time. I agree, most people who build L98's do it the wrong way and they are slow.
His buddy had similar mods and boxed lower control arms, drag radials, and a 2800 stall, and ran mid 13's with his IROC.
Mike
His buddy had similar mods and boxed lower control arms, drag radials, and a 2800 stall, and ran mid 13's with his IROC.
Mike
Staging Lane
Joined: Dec 2004
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From: chicago,il
Ive got a buddy with an 89 iroc that he swap the 305 out with the 350 and he ran 14.0 at like 97 with a upgraded trans a small converter and BFG drag radials. Everything else is stock. Everytime we would race in my lt1 (longtubes, ory, loudmouth, CAI, M6, and minor suspension), he would take me by a car off the line with his drag radials and hold till i got to mid second or the top of third and i would pull on him like he let off the gas. Yeah the TPI's are quick, but they are only quick up to about 60 mph on stock induction pieces, after that, they run out of breathe hard.
I have a buddy that had L98 heads(minor head work from what he said, dont know what he considers minor), a lopey cam(dont know the specs), stock intake, stock suspension, 3.73 gears, 3000 stall, shiftkit, longtubes with true duals dumped out the side in front of the tires, MSD, CAI, and I think thats about it. He showed me a few 13.1 time slips, and by the way it was an '89 305 Tuned Port Firechicken, not a 350. I know I'm gonna get the bullshit card, but its true. That car ran damn good, sounded sweet too.
The stock L98 heads flow like 10% less than the WORST LT1 heads an intake might help but the heads are still a big cork. Once they get into heads and intake well then we use similar bottomends so at that point it comes down to the quality of their parts.
Originally Posted by 94strokedz
I have a buddy that had L98 heads(minor head work from what he said, dont know what he considers minor), a lopey cam(dont know the specs), stock intake, stock suspension, 3.73 gears, 3000 stall, shiftkit, longtubes with true duals dumped out the side in front of the tires, MSD, CAI, and I think thats about it. He showed me a few 13.1 time slips, and by the way it was an '89 305 Tuned Port Firechicken, not a 350. I know I'm gonna get the bullshit card, but its true. That car ran damn good, sounded sweet too.
Naw, just playing i believe it... Gmhightechperformance got a 305 to run mid to high 12's in a 5 speed firebird. way way way back in the day though!
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From: Midland
Originally Posted by 2MuchNos93LT1
younggunls1 he forgot to tell you he was on a 200 shot not to be rude but I can sware to the bible I have never seen a tpi/l98 even cammed up go faster than a 15.5you know what I take that back there is 1 with a 250 shot running a 13.3
Originally Posted by 94strokedz
I have a buddy that had L98 heads(minor head work from what he said, dont know what he considers minor), a lopey cam(dont know the specs), stock intake, stock suspension, 3.73 gears, 3000 stall, shiftkit, longtubes with true duals dumped out the side in front of the tires, MSD, CAI, and I think thats about it. He showed me a few 13.1 time slips, and by the way it was an '89 305 Tuned Port Firechicken, not a 350. I know I'm gonna get the bullshit card, but its true. That car ran damn good, sounded sweet too.
For comparison though my baby cammed LT1 in my much heavier Caprice with 2800/3.42s has gone 13.2 on the ONLY night out since the header install and this is with the stock iron b-body heads, I feel there is more left in the combo especially given 87 octane at that time and a minor topend fuel issue.
The TPI isn't all bad you just have to recognize and correct it's weaknesses if you expect it to go fast, the intake and heads are WEAK like the headfs in stock form are under 200cfm.
Originally Posted by 96capricemgr
Did he mill the snot out of the 350 heads to allow him some comprtession with the smaller displacement? A "lopey" cam and the LOW compression which 350 heads on a 305 would result in is not a good recipe. I bet it was a 350.
Docspeed can attest to that. Back in the day I remember him putting a big cam in a 305 that was in a 70ish Nova. The thing sounded like it would win the Indianapolis 500 but was as slow as snail crap.