a buddy of mine has a 1992 camaro with the 305tbi (both are 2.73 but mine is posi) and i was just wondering by how much do you think i woul beat him 0-60?

 

0-60? Who cares, that's like saying who can eat a cheeseburger faster...completely pointless.

 

i just was wondering bout 0-60 cuz i have always heard that tbi's are slower to 60 and he said that he could woop my *** to 60. i know that 0-60 isnt very important i just want to beat him so he will shut up. i can never turn down a race.

 

Are your cars both stock and automatics? If so are they both in good tune? TPI makes a good amount more torque than TBI, it also makes more hp. But at this age dont be surprised when you dont beat him as bad as you thought. Theres to many factors to just be a TBI/TPI thing, but in a perfect world where both cars are 100% stock, both autos and same rear gears, in a perfect state of tune, and drivers are equal yes the TPI will come out on top everytime.

 

yeah there both autos and have the same rear gears. mine is posi and his is lsd. his car is completely stock and mine is to for the most part. I did the smog pump delete and tb coolant bypass and i also have full flowmaster exhaust.

 

LSD is Posi. Posi-Trac is just GM's name for a limited slip differential. His car is probably an open diff, which is going to hamper his take off.

You're most likely going to win, all things are pretty equal except your intake and heads give you a slight edge.

 

Averages say 0-60 for TBI is around 8 to 9 seconds. 0-60 for a TPI 5.0L auto car are in the 7 to 8 range. LB9's don't really start doing anything performance wise until they get a cam, GM handicapped all 5.0L TPI auto cars except for the 1985 TPIs.

L98's were around mid 5's to 6.5 seconds to 60. Again later years being faster due to tweaks.

 

yeah my bad about the lsd thing lol i realy didnt notice that til you mentioned it thanks! and why is it that GM did that in 1990? the 305 had the most hp and torque than any other years why i the hell didnt they give them a better cam and free'er flowing heads? i sill don't understand that.

 

LB9's all got the same heads, only different cams. The 1985 LB9 was just a L69 with a TPI on top. Same heads/cam.

L03's got swirl port heads and the baby cam.

1986 Lb9s got the L69 heads and a baby cam.

1987 and up LB9 goes the TPI 5L heads and either the baby cam (auto's) or the L98 cam (manuals).

Why did GM do it? I don't know, but I think it was stupid of them.

 

my lil 305 tpi is a runner and they will get up and go stock but their is room for improvement. GM should have put the l98 cam in all the 305's if it was a performance model like the trans am, formula, or GTA. and they should have made it an option for a lower model to for the small cubes its a stout lil engine.

 

The L03 will burn the right rear tire off then fall flat on its face...if the TPI car has a LSD that isnt wore out it will take off and leave the TBI engine way behind... my 91 RS stock ran 16.4s an IROC with TPI 305 ran 15.5s it was a second difference

 

I would think it will be close. 305tpi's aren't that fast.

 

ALL 1990+ 305 TPI engines had the same cam. The difference in the HP numbers was the N40 dual catalyst exhaust. The 205 HP cars came with the TBI exhaust manifolds and Y-pipe.

I think it will be a closer race than most would want to believe.

 

I thought that the 305tpi cars from 90+ had to 235bhp.

 

Only if it had t he N10 duals (I typo'd a second ago with N40).... The N10 setup was part of the G92 package. The single catalyst 90+ 305 TPI cars came with 210 HP/285 TQ as opposed to the 89 single cat peanut cammed 195 HP/295 TQ

 

Oh I see. Amazing that just a cam and exhaust on a 305tbi will make a Z28 look slow.

 

I have a similar question as the OP

I have an 89 305 TPI Z with headers and full 3inch flow master exhaust(mandrel bent), air foil, and custom CAI, and LSD.

He has a 92 305 TBI RS with trans am rear end, edelbrock airfilter with ram air hood and cut off exhaust at the cat.

So who would most likely come out on top at the 1/4?

 

Is your car a 5 speed? If so, you'll walk him like he threw it in reverse.

If your car is auto, not as much because you'll have the peanut cam, but there is still no way he's going to win in a heads up race unless you decide to pull 2 plug wires to make it fair.

A 305/a4 TPI car should be low to mid 15's 1/4 mile. A TBI car will be lucky to turn a sub 16 second 1/4 mile in near stock condition. An L98 or LB9/5spd would be almost 1.5 seconds quicker on average, if not a full 2 seconds faster in the case of the faster L98's.

 

If '86 got the baby cam, what cam did the '87 350 TPI get? I always thought it was the baby cam.....

 

Our cars are both auto.

We might be going to the strip in 2 weeks. he claims he can beat me in the 1/4 so hopefully i can show him otherwise

 

87 L98's got the following cam.
202/207 duration @.050" lift. Valve lift (1.5r) was .404/.415 on a 114.5 LSA.

Its very similar to the later speed density cams for 90-92s. Exact same specs cept the SD cars got .413 and .428 lift.

The 88 and 89's got 207/213 @.050" lift with .415"/.430" lift on a 117* LSA. More aggressive duration but with a wider LSA so it calmed it down a bit. Not sure how it directly compares to the SD cams performance wise, thats a little more technical than I can be.

On a side note about the differences heads make in performance my baby cammed, iron headed LT1 has the 179/194 @.050" duration cam, but still makes 260hp thanks to the better intake, heads, and exhaust.

 

Your iron headed LT1 doesn't have that cam unless YOU put it there.... Its 191/196 @ .050, .414/.428 on a 111* LSA....Its the same cam that came in the 1996-2002 L30/L31 Vortec truck engines.

The 179/194 @ .050, .350/.385, 109* LSA cam came in the TBI engines and the 1987 LG4 ONLY.

 

lol i just found this topic. mine and josh's car are nearly identical while playing around on the street. i think my tbi car will come close to beating his in the 1/8 because i have a lot lower gearing. however in the 1/4 i think he will pull me a little. you cant compare the specs from the factory beccause both of these cars have well over 100000miles on them.

 

so what happened to the op's race and the other guy's?...

 

Back in the mid 90's my 89 305TPI was BONE stock with an airfoil and K+N airfilter. My good freind had a 92 RS 305 TBI, again BONE stock with a K+N airfilter (not that those 2 mods make a diff but,,) and we would race up and down the strip. Every time, from any speed. I would walk his car like it was a v6. EVERYTIME.


The same went for my freind in his 87 LB9 auto car. Would spank him with up to a 2-3 car lead in a 1/4 mile + race.

Only 305ci Thirdgen that ever beat me was a rotted out, bondo covered 85 LB9 iroc with 1xxxxxxxxxxxx miles on it. Guess becasue of the cam.

Now, Here's my question. I also raced a stock SD LB9 back then regularly also. And used to beat him by a 1/2 to about a car + 1/2 In about a 1/4mile race. If the SD 90-92 LB9's had the better cam, why did my peanut cammed car always win?

This is why i always thought of my car to be a factory freak..

And to answer the OP's question. YES you will win. Just be sure youre car is in good tune, ie- plugs, wires, ignition, sensors, ect.. And get a good launch dont roast the tires off. And you got him all day.

 

I'll race ya, mines just a lowly tbi car,lol.

 

LOL,, You have a bit more than a K+N air filter.hahahaha..
Although, with both our mods (my cars not so stock anymore) it would be a nice race.