Iroc vs Trans Am

I recently bought a 1990 Iroc-Z w/ the 350 TPI engine ( auto ) . This kid at work says he has a 1996 Trans Am w/ Ram Air and he says he has 320 hp. From what I've looked up the stock T/A is about 285 and ram air doesn't really do much for performance. His is manual. Now, unless he screws up shifting, he's gonna win, but he insists he'll kill me. In the 1/4 (assuming hes an average shifter) how much do you think he'd win by and how much hp do you think he's actually got ( assuming its stock except for ram air)?

His car is "rated" at something like 285HP.
He'll kill you. He has a low 14-high 13 sec. car.
You have a low 15-high 14 second car.

Yeah if it's a 96 Trans Am you hardly have a chance. Now I know the GTA (the 350 Firebird cousin to your Iroc-Z) only came with Automatic, did the Iroc-Z only come with automatic or was there an option for a 5-speed?

With the 305 engine, there was the automatic or 5 speed option, but the 350 only came in the 4 speed auto.

The 305 was the RS though as well as the junky V6. GM's logic sometimes.....I dunno. Best engine, make it an auto only...

actually your wrong the 305 was put in early model irocs and was put in 90-91 z-28 when you got a manual tranny. and most 350 you see have a auto. almost all manual tranny's between 82-91 had 305


the differance in the 2 is IROC/Z-28 305 TPI
RS came with 6 cly or a 305 TBI

o yeah don't race him you will get smoked

You could get iroc-z's with a 305 tbi, tpi, or a 350 tpi. They only used automatics on 350's because the motor would tear up the weak 5-speed. You could only get 305's in convertibles. I have a 305tbi and 305 tpi iroc. I just sold a 350 auto iroc coupe. when the iroc first came out in 1985 the biggest motor was the 305 tpi. There is a big difference between an lt-1 motor and the traditional 350 tpi motors. ;)

what year iroc came with a 305 TBI ???

85 305 TPI
86 305 TPI
87 305 TPI or 350 TPI
88 305 TPI or 350 TPI
89 305 TPI or 350 TPI
90 305 TPI or 350 TPI

I just sold a 1989 IROC convertible that had a 305 tbi and automatic from the factory.

How would it tear it up, the Vette had the 350 as well and didn't they have the option of a 5 speed?

I don't think that vettes ever had a 5-speed tranny. In the mid 80's they had a 4+3 transmission, and an automatic. As far as I know they used those until they started using the 6-speeds. If they did use the 5-speed maybe it was from a different manufacturer. I would sure like to know if anyone has seen a 5-speed eighties corvette.

I was guessing anyways I would of thought by then it would use a 5 speed since the V6 and 305 V8 Camaro's and Firebirds used them.

One word: (Although it might hurt your engine over continued use) Nitrous :smoker2:

Either that, or hit the gas, powershift. amd pray to God he sucks at driving stick. In my experience, 70% of new Trans Am owners (I'm sure noone on this site..dont worry) buy a Trans Am purely for the look..and to pick up chicks. They may not be able to handle the power. (hey, if i could afford one i'd drive it..)

Originally posted by Blackbird01
His car is "rated" at something like 285HP.
He'll kill you. He has a low 14-high 13 sec. car.
You have a low 15-high 14 second car.

Damn,that would really give him hope

A 1990 IROC with the G92 package will have no problems hitting low 14's (14.2...14.3) if it is in good tune. If you got the 2.77's then I say mid-high 14's.


He will beat you though by a bit. Nothing some mods couldnt fix :)


Or just race him 0-60 :D If you launch well you got him there.

Got out and lease a viper from the local dodge dealership. Race your friend for a decent amout of money. Beat him take the money buy mods for your current car and take the viper back teh next day. See problem solved:D :D

Got out and lease a viper from the local dodge dealership. Race your friend for a decent amout of money. Beat him take the money buy mods for your current car and take the viper back teh next day. See problem solved:D :D

Why not get a decent auto shifter, something that will give you a little edge, like a hurst shifter or something.

Originally posted by Z28Josh
Why not get a decent auto shifter, something that will give you a little edge, like a hurst shifter or something.

Yeah that always works it would also be 85k cheaper then my idea ,but hey I think mine would be less work.

Originally posted by jonbravo27
I don't think that vettes ever had a 5-speed tranny. In the mid 80's they had a 4+3 transmission, and an automatic. As far as I know they used those until they started using the 6-speeds. If they did use the 5-speed maybe it was from a different manufacturer. I would sure like to know if anyone has seen a 5-speed eighties corvette.

yup, 4+3's were pretty much the norm for the 80's C4 vettes. The only other manual I can think of that was used in 80's was the 6spd. debuted in the '89 ZR-1.

As for the T/A vs. iroc race, if he can't drive it very well you might come off the line quicker as he spins or bogs. I've seen 350 auto's run some consistent 2 flat 60' times, but other than that, he has a much faster car, especially if he has done anything to it at all. His T/A should be a 13 second car with very minimal mods.

I have an ’86 IROC and recently replaced the 5.0 with a re-built 5.7 from an ’87, added an Edlebrock cam, Edlebrock headers, Hypertech chip, Hypertech air-charger, Hypertech coil, Flowmaster, and disconnected the cat and smog pump. This car can keep up with most of the late ‘90s-00 Z-28/SSs and TAs I have raced on the street. My next project is to install an ATI supercharger. I suggest you add some mods including the supercharger, then you will truly kill him.

http://files.automotiveforums.com/uploads/344746IROCZR1cropsmaller.jpg
http://files.automotiveforums.com/uploads/29775270ELCOSS.copy.jpg

disconnected the cat and smog pump

And what do you do come inspection time?

A friend of mine built a straight pipe with 3” flanges on both ends that is the exact length of the converter, then welded identical flanges on the cat as well as the two exhaust pipe ends, so it’s just bolt on bolt off as is the smog pump. By the way, that’s a nice looking truck you have, as is that Firebird.

Anyway whatever happens let us know. I'm sure you'll have a good chance aginst this guy. If not then you could always run around racing supra's.

P.s.

Thanks I like the truck too,but I wish I could say I owned it..lol..I just liked the pic and made it a Icon.

Blackbob