My buddy has a 1988 turbo Supra with 235hp and 245 ft/lbs.I have a 1987 Gta 305 5spd with high flow cat 3 inch walker pipe to dyno max super turbo muffler.The cars are the same weight.Who would win.We both have 5spd.And could someone tell me the stock hp and torque for a 1991 mustang 5.0 lx aod.Thanks

 

I'd say you're GTA would win because of the outstanding torque advantage. The gearing is a little better in the GTA I think also. Mileage of the cars also plays a part in acceleration.

Stock 91 5.0 mustangs came with 215 hp at 4000 rpm and 285 ft/lbs of torque at 3200 rpm
(their automatics have low gearing, but their T5's have higher gearing)

Is that LB9 stock? because GTAs didn't come with 305s, only a small fraction did that were specially ordered directly from GM.

visit my website:
members.v3space.com/thirdgen/index.htm

 

Well, my 86 IROC w/ its 305 TPI auto (204/214 cam, ADS chip, ported plenum, flowmaster cat-back and 3.42s) whipped up on a Turbo Supra from around that year model.

I would think with your factory cam only being slightly worse than mine, w/ similar mods, and you have nearly the same gearing only w/ a 5spd you should also be able to put down the Supra. Go for it and post the results, should be interesting.

------------------
Ray87Z
-Vortec headed 350.
86 IROC w/ a cammed 305 TPI.
Formerly Ray86IROC.
www.inter-scape.com/Ray

 

iroc22 all five speed GTAs came with the TPI 5.0 and they arent that hard to find. just wanted to let you know.

Stormshadow not sure if you would win or not but race him anyway have fun and practice your driving. dont worry about losing just have fun. TINFY

 

GTAs came with the 5.7, but you could delete it to get a 5.0. The main reason for doing this was so that you could get the 5-speed (as GM would not put a 5-speed behind the 350).

My GTA came originally with a 305 and an automatic. I don't know why someone would order this car, but that is how it came.



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'88 GTA w/ t-tops
355 TPI, TPIS airfoil, Edelbrock headers,
Flowmaster exhaust, cold air induction,
MSD 6AL ignition, ADS chip, 1.6 rockers on intake,
BMR STB, Spohn SFCs
=====
Stereo:
Panasonic CQ-DFX700U
Infinity 4x6, Alpine 6x9
Rockford-Fosgate Punch 400a4
80 watt Bazooka sub

 

The GTA package originally came with the 350 TPI. The only way you can get a 305 5 speed with a GTA is to order it from a dealer. GM only fitted GTAs from the factory as 350 cars and usually the dealer changed the engine. The GTA had the B2L 350 as standard equipment. Trans Ams came with the 305 5 speeds because that is what Pontiac wanted. One problem with GTAs is the amount of fakes running around. Reproduction decals are abundant and easy to apply to the car. Doing this can make almost any trans am look like a GTA. Look at your console RPO codes, if it is a real GTA it will have a Y84 stamped on it.

check out this page for further info:
www.gtasourcepage.com

 

iroc22 i have read the web site many times. no the 305 was not dealer installed it was a factory installed motor. do you really think the dealer would change the engine and transmission and not slap their name on it.I dont think so. besides in chaning the engine they would have to change the vin number which has the engine size code as the eigth digit which in turn is illegal you cant just swap in a new vin if you feel like it. GM built the cars with 305s so that they could put a manual tranny behind the engine. they claimed the transmission couldnt handle the torque of the 350. and the standard engine for the GTA is the L98 5.7l TPI. go read the site you listed its all there in black and white(literally). TINFY

 

hey Buck Mustard that is an odd combo to me anyway. i have only heard of that combo in early IROCs and the 91-92 GTAs. oh well i see you have changed that though bet it made a big difference huh. TINFY

 

My car was origionaly a 305 tpi car with a 5spd. (see sig for its current status. ) I had also heard that you had to special order them this way. My car has the hotter cam the 3.42 positrack and the dual cat exhaust. I have seen a few others like mine around though.

------------------
1989 GTA TRANS AM
Was a TPI 305 & t-5 car.
Is now 383 stroker w/ the same T-5
World products Sportsman II heads. Lunati pistons and custom ground camshaft. Will dyno after the break in but is estimated at 450 hp and 520 ftlbs. The T-5 is on a suicide mission.

 

My bro-in-law had an '87 GTA with a 305TPI engine and an automatic. I verified it in the VIN and the option codes. He never ran it at the track, but as "un-fast" as it was I'm sure it had the peanut cam.

------------------
Greg Westphal
'87 IROC 305TPI/A4

 

Dealers have been installing engines in cars for a long time without putting their names on them. My dad bought a 1967 Chevy II with the L76 365hp Corvette engine backed by a M22 4 speed muncie. He also bought a dealer installed LT1 350 in a RS '71 Camaro. There's no kind of indentification from the dealer and I can verify this from my Dad. No, I'm not lying and yes there were no kind of dealer advertisments on the cars. As for auto 5.0 TPI GTAs, there wasn't ever such a thing unless the buyer changed the trans after it was off the lot.

I'm just a little frustrated because I know alot of fake GTAs floating around from my own eyes. I've gone to look at a few "GTAs" that didn't have the Y84 on the RPO console sticker.

Also take a look under the FAQ section of this site. They have a GTA question.

 

OK............Mine is a real GTA with a the 5.0 TPI and T-5 tranny. You could order them from the factory this way! As mine was. I have the factory build sheet.

------------------
1989 GTA TRANS AM
Was a TPI 305 & t-5 car.
Is now 383 stroker w/ the same T-5
World products Sportsman II heads. Lunati pistons and custom ground camshaft. Will dyno after the break in but is estimated at 450 hp and 520 ftlbs. The T-5 is on a suicide mission.

 

Holy crap GTArob, how long have you had that T5 behind that engine?

 

oh and TINFY racing, I know there are 5.0 TPI GTAs, its just that I thought there was a small fraction of them hanging around because people usually just kept the B2L 350. I didn't mean to start a huge argument or anything like that. What we have gotten into is totally off the original topic.

 

iroc22 you are throuwing around wrong info left and right. what is a B2L 350 and the B2L never came in a GTA it was the L98 only unless the buyer chose the 5.0. Yes you could get an auto tranny behind the 5.0 from the factory. and no no no the dealers did not swap trannies or engines in the GTAs on a regular basis may be after the car was bought the person had it done by the dealer instead of a custom shop like your dad did, but dealers did not do this before selling a car. unless it was a rare special make like the Berger Camaros of today and old or the baldwin motion cars. and also i just noticed this and this could be a big problem and the answer to the descrepencies in our posts. you live in Canada I dont know squat about Canadian bound cars so that could be the whole problem right there but I doubt it. man please do your research and ask questions if somehting is unclear but dont throw around information that you dont have documentation to prove your right.TINFY

 

The sig is up early. I just picked up the engine and the tranny should be ready shortly. I just hope it can hold out until I can get the Tremec or T-56. What is killing me is that I have to play nice for 1000 miles of break in time. That should only take me about three weeks to get in though. School is pretty far away.

 

One more thing. Just for personal reference, I just figured I'd put the production figures for the LB9 in the GTA

1987 They were bunched together with the T/As
1988 2,852
1989 366
1990 289
1991 714
1992 82

 

I don't know anymore, but I have this Pontiac book at home and it says in it that the GTAs came factory with the B2L as standard equipment and the 5.0 only with the T-5 could be specially ordered from the factory. It says also that the GTAs were supposed to only come from the factory with the T-5 because the GTA was a high-performance option. GM tested the T-5 behind the 350, but they figured they would have too many warranty problems with the T-5 being too weak (as you mentioned earlier).
Oh and my Dad's Chevy II and Z28's engines were not installed by a custom shop, they were installed by two different dealers. The dealers installed the engines because they wanted to sell the cars as something special and make a bit more money (that's what my Dad tells me). And I'm pretty sure the GTAs are the same in Canada and there probably isn't a difference. Also I'm done with this topic because I don't want to throw out any misleading information or false info anymore.

 

The B2L 350 is the true RPO code for the 5.7 liters in the F-Bodies. The L98 RPO code is for the Corvette 350 with the Aluminum heads and a slightly different camshaft.

 

Hey GTArob, I don't know if you'll see this but do you live in Grande Prairie Alberta? If you do, what colour is your car?

 

I'm no a moderator but I would move this to history/restoration section. GTAs came w/305-5 speed if you wanted it.Period.No big mystery.GTA was an option package not a guarantee of GTA=350.Just like if you wanted an IROC w/5speed, you'd have to settle for a 305.Nuff said.
Now back to Topic:
You will smoke the SUPRA/TURBO if you know your stick. I've had some charecters w/older Supras try to race me. No dice.They are a much better handling cars and at above 100mph, I would leave them be. But in a 1/4 you should have no prob.

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1990 Formula
Factory:TPI-305/Dual Cat/5 Speed,3.42 rear, Dealer:Aluminum Drive Shaft(230hp)
Mods:SLP air foil,K&N Filter, Accel:wires,coil cap,rotor.Hypertech Thermomaster chip,Stat,Fan switch,TES headers,Flowmaster 3" Cat-back exhaust,TB coolant bypass, Centerforce clutch (going).

 

sorry iroc22 i reread my post and it may have been comfussing i was saying instead of going to a custon shop your dad went to a dealer which i have heard of others doing. as far as the B2L vs L98 confussion i am confussed as well and am going to post a new topic to try and find out what is up. TINFY

 

Consider it moved as requested.