trackbird

I was assuming the LS1 would have the limiter removed (and still lose).

FruityOne

I'll have to track down the article, but the 1987 Camaro IROC-Z with the 5.7L TPI, 700r4 ran to 149mph. I've heard stories of them going faster. With the Trans Am being more aerodynamic I'm sure it could squeeze another mph or two out.

Here is the article I am referring too. Road & Track, October 1986
The perennial Ford-Chevy battle continues with a 225-bhp GT vs a 220-bhp IROC-Z
*If you are going to pound me for saying there were no 5.7L TPI Irocs in 1986 then you are correct. It was a magazine test testing the new models for the year. Notice that both cars are rated at about 220hp. In the later years GM gave them more power. To the tune of 245hp and 345lb/ft for the 90+ SD cars.

A stock 91 Trans Am GTA owned by someone I know dynoed 225hp and 315lb/ft to the wheels. He didn't even have a K&N filter on the darn thing! 150mph is ENTIRELY possible.

My own experience tells me that 145mph in my GTA is quite possible. Fastest I've ever run was about 135mph (on my speedo) before I chickened out and let off the gas. Had plenty of throttle left because I couldn't go into 4th gear at WOT. That maybe one reason that some people don't think they can hit 150mph. Because just about all 350TPI/Auto's (except B4C's) were not capable of going full throttle in 4th gear. They had to maintain about 2/3rd throttle or it would downshift into 3rd.

CODY BEHNKE

How fast do you all think a stock TTA is? My goodness yes they are qwick but they aren't faster than any LS1. A decent driver can pull 0-60 in less than 5 seconds. My friend has a pretty nice TTA that is all stock except a little air box modification and I roast him.

By the way the Gatorbacks aren't any worse than the OEM eagle F1's and GSC's on LS1's.

FruityOne

*Shrugs*

Its all a guess until we get solid numbers from a stock TTA.

Motor Trend quotes 4.6 seconds to 60mph in a TTA (I have a video for proof), and through the 1/4 in the low 13's. They don't state the exact time, or trap speed though. However, 4.6 seconds to 60mph is definitely mentioned. Motor Trend TTA Review

As far as top speed, I think a TTA would edge out the LS1 on the very top end. The thirdgen Firebird body is capable of hitting 200mph while remaining stable without ANY body modification. And even on the 300mph bonneville cars all they did was lower the car, change the rims, and duct tape the windows shut to prevent them from blowing out. Though they did add a little weight for some "free downforce"

1BADDAM

Don't have to think about that one.

In the 1/4, Mags had them from 13.4 to 14.2

Other owners have claimed stock times as low as 12.9's

Mine was never baselined, but for less money than the cost of a lid for an LS1, I went 12.7 @ 113 on reg. street radials.

RobsWS6

Mine went 13.0@104 with just a K&N, thermostat, and chip. That was my first and only trip to the track with that setup. Ran 5 times and they were all 13.0x.

As far as tires, Gatorbacks are terrible compared to the GSC's and F1's. I could cut high 1.8x on my GSC's in my 96 WS6. And that was an M6 and 4.10 gears. There is no way you could do that with stock Gatorbacks, even if they were brand new.

As far as top speed. The TA is much more stable at speed than a 4th gen. My WS6 was a hardtop and the windows were still trying to pull away from the roof. The TA was nice and quiet at speed, no wind buffeting.

The cars make similar power numbers but at different rpm. The 4th gens can't pull up to the rpm whereas the TTA can pull the rpm needed to run the faster top end. Its right in its power band where the LS1 can't get there with the gearing it has.

CODY BEHNKE

So a LS1 lacks top end and gearing?

No

RobsWS6

Not top end, gearing. Try and run it out in 6th and you'll slow down. It will not pull to the top of 5th either. Not enough gearing to pull the rpm up to peak power.

Don't be so close minded about the almighty LS1 and the LC2. Completely different animals with different power curves.

trackbird

The power curve and aerodynamic issues are why I'd put my money on the TTA. I like my LS1, don't get me wrong, but "different animals" about sums it up.

CODY BEHNKE

I ain't just saying LS1's are better. This is just a HP issue.

I think that it is pretty obvious that a car (LT1 or LS1) won't accelerate in 6th Duh!

I understand the power curve thing too. Like I said my buddy has one!

Look at what 4th gens are pulling of without a limiter. Just like how a LS1 C5 tops out higher than a ZO6 because of gearing.