Who would win..

1986 Trans AM WS6:
T-Top
305 TPI
CAI
Airfoil
Ported upper plenum
Adj fuel pressure reg. @49lbs
Hypertech cap and rotor
Msd 8.8 mm wires
Msd plugs
Smog pump removed
AC removed
EGR removed
Hooker competition ceramic headers 1/58 to 3" collector
3" y pipe
Custome computer prom
2800 stall
Built lvl 3 700R4 Raptor transmission
Transmission cooler
160* thermostat

9 bolt w/2.77 posi
ADJ. Lower control arms

I believe that's it


VS.

1992 firebird formula:
305 TBI
K&N air filter
Pacesetter headers Custome
2.5" y-pipe
Msd cap and rotor
Msd coil
160* thermostat
3.23 gears open dif.
Sway bars panhard rod
Stock 700R4

 

I ran my all stock L03/700R4/2.73 T/A against an LB9/700R4/??? gear T/A from a light up to highway speed last summer. Just as you might expect, my car ran out of breath before his did at the top of each gear. So I could run with him from the start, but in the last 500-1000 rpm of 1st gear, my L03 was out of breath, and I had to shift. As a result, he would start to pull away just a little before each shift. Not a dramatic beat down, but it was a car length by the time we were hitting highway speed in 3rd. I was not disappointed with my cars performance, but I think he thought his car was gong to just walk away without having to try, and that was not the case.

 

Awsome

 

The rear gear is really the only thing that the 92 has over the 86. Maybe off the line the 92 has an advantage, but the 86 would definitely be able to pull ahead once they're moving.

 

Sorry but that 86 TPI car is going to annialate the L03 car. We are talking probably a full second faster in the 1/4. For the first few hundred ft though the L03 might be right there with it.

 

Nice that's what I like to hear..... I'll tell you all what happens when we race

 

OK so we did it Sunday... At the start I had real bad traction issues which I'm going to fix.. But he pulled 2 1/2
Cars off the bat but I ran him down the whole track. I didn't win but my nose of my car was about to tag his driver door.. It was fun but ya if I were to hook I would. Have pulled the whole time.. I have video.

 

I would have figured the tpi would've definitely trumped the tbi anyday???

 

Post the video!!

 

I only lost due to traction. But caught him all the way down the track.. I caught 2 1/2 car lengths.. My tpi is waaay faster just didn't launch very good.... Like I said a lot of wheel spin.... And I'm trying to load up the vid

 

Stock for stock an 86 TPI only has 20 HP more than a TBI car.....Hardly a full second in the 1/4. The TPI car also has a lame 2.77 gear. My personal opinion is that this is a drivers race, pure a simple. Whoever can put the power down is going to win.

 

Even if you hook, with that 2.77 gear you are just going to BOG the engine badly off the line and the TBI car will still take you. More off-idle torque and a better gear in the TBI car. I really doubt your "2800" converter is stalling a true 2,800 rpm behind that 305.

 

Maybe with mods a 5.0 TBI car isn't a second slower than a TPI car but in STOCK form and equal gearing it is. Ive seen too many over 20+ yrs hanging around and racing at the track. I honestly believe the Lb9s had more than the advertised 205 hp in the automatics. I would bet good $ they put down around 220 FWHP

 

Dont forget that the 86 is that much older and take into consideration maybe the engine has some more wear and tear. 86 is also before they went to the roller cam if im not mistaken. TBI is rated at 170 HP and the LB9 is rated at 190, but Im convinced the 92 has the upper hand with those gears.

 

I really feel that stall.. I had no bog... She just started blowing the tires off.. Like I said I pulled and had no prob catching him down the track. My lb9 just walked on him but I didn't get traction at the start....

 

I have also been around these cars for years at both the track and on the dyno for over 10 years myself. With the peanut cam and LG4 exhaust the 86 LB9 by no means comes anywhere close to either of those HP figures. It barely wheezes out more power than a stock L03 on the dyno and barely runs quicker down the track. In fact it takes a L98 cam and dual cat G92 exhaust to make a LB9 considerably quicker than a L03 STOCK FOR STOCK with EQUAL TRANS and GEARING. I have modified and chip tuned both and even put TPI on TBI 305 and 350 and honestly they are pretty equal. I put a 305 powered G-van on the dyno after swapping from TBI to TPI and found that the only place I gained power over he TBI was between 3,200 rpm and about 4,400 rpm, the TBI was better everywhere else.

 

wow...

 

These are examples of some stock 3rd gens ive had and what they turned. 1987 Formula Lg4 Auto 3.08 gears: 15.88 1991 Z28 Lb9 Auto 2.73 gears: 14.76 1989 Firebird Formula L03 auto 2.73 gears:16.16. 1982 Z28 5.0L CFI auto ?gears: 16.70 1987 GTA LB9 auto 3.08 gears: 15.44. As soon as I get my headers and my chip upgraded I will be glad to post what a internally stock L03 with headers, 3in exhaust, and 3.73 posi will turn. Im scared those cylinder heads are going to be very limiting and not nearly as good as the 081 heads. I hope im wrong Fast 355 and I know you have a lot more experience with these TBI engines than me. I will say this about the L03, it is extremely good on gas and runs extremely well with excellent torque out of the hole.

 

Really? I would not have thought it to be into the 15s.

That's about right...maybe even a little quicker with an auto than I would have expected.

That's a pretty nice difference with just one jump in gears (don't know enough about LB9s to know if the HP rating is the same 1991 Vs. 1987).

I look forward to seeing what your results are. I know Ron U.S.M.C. is pretty happy with his 3.42:1 gears.

 

My stock 305tpi 86 trans am ws6 beats my brothers 305tbi 92 camaro Rs every time we line them up, even from a 50mph roll on the highway. I wouldn't say I destroy him but I am always ahead by about a car

 

If that is one car length in an 1/8 or 1/8 mile that is about 1/2 to 1 tenth, hardly a full second difference between the cars. 1986 should be the peanut cam with a 190 HP rating vs the TBI cars 170 HP rating. Which 20 hp at those power levels should be 1-2 tenths in the 1/4 mile.

 

Nice job on the math, most of our races aren't organized into 1/8 or 1/4 miles. If we are on the highway and it's clear then we will go till one lets off or if we see other cars, if it's on a dead empty street from off the line we will just run them within the safety limits of the street. Nothing organized, just testing our cars against each other