[Tommy R]

Hey you all,

I'm looking for information on 4th Gen F-bodies. Specifically, I'm interested in the diff options, gearing differences (rear end and tranny), 1LE vs. base model specs, and any other differences from model year to model year.

For example, I know the '93s are speed density, not mass air. Are there any differences there from a performance or maintenance standpoint? The '93s also had a slightly different T-56 tranny, as I understand it. Were '93 and '94 models not available with 3.42 rear gears? Would a 150 mph speedo indicate that the car has 3.42's? No governor? I remember my old roommate's '94 T/A didn't have the "GT" package and as a result had the 115mph speedo, governor, and maybe even 3.23 gears (instead of 3.42s).

I know in '96 they went OBD-II with dual cats. They're also rated at an insignificant 10 hp more than the '93-'95 models. Of course, in '98 the LS1 came out with much more power. However, the LT1s are obviously still very compeitive in F-Stock, despite the power deficit, iron block, and smaller front brakes. Any particular reason for this? Or are the right people just not running LS1's? (IMG:http://www.frrax.com/rrforum/style_emoticons/default/unsure.gif)

So, needless to say, I'm intersted in LT1 vs. LS1 differences, too. But, I'll likely stay with the cheaper candidate, i.e. the LT1.

I should point out that I'd mainly be interested in F-Stock, so update/backdate concerns are of less importance. I'm not sure if/when I'd move to ESP.

Thanks in advance,
Tommy

[robz71lm7]

I regularly compete againt LS1 cars.

In fact I am the only LT1 car in the area... And I do pretty well against the LS1 cars. One of them is a WS6 car and I go head to head and toe to toe everytime. It is a good match. He has more motor, tire, suspension and I am within a second (last week) of his times.

I do have the LS1 brakes all around. The LT1 brakes are horrible... and the biggest weakness of the LT1 car IMHO.


I need to look at the other LS1 cars from the last autocross.. Paul Williams (FS) beats my times on Kuhmos. (Not to mention a great driver.)

A LS1 vert I beat more then half the time. (He is on Hosiers.)

The LS1 WS6 (from above) is always a head of me (but behind Paul)- is anywhere from 1.5 to .7 seconds ahead.

A LS1 1LE SS gets killed by everyone. He is on decent streets, but less expreienced then I... But, my expirence is thin too.

So I end up being middle to upper ground and about the 3rd fastest FBody near me. Hopefully with these new wheels and tires I bump up a few.

So as far as competition ability the LT1 still has a big can of whoop ass.

You can't really compare the two engines between cars that are setup differently and driven by different people-especially at local events.

Heck some people have good and bad days. For example I've beaten Greg Cudnick (slightly faster than paul williams) by over a second and Paul has beaten me by over a second at times.

LT1 brakes really aren't that bad for FS if you use good pads (w/o they suck). I could consistently lock up my 275 victo racers with LT1 brakes and HP+ pads. I just switched to LS1's for open tracking.


Trackbird, I'd feel more comfortable putting heads and cam on a stock bottom LS1. LS1's are just plain stout. A lot of LT1 owners are experiencing spun bearings after heads and cam. Some of that is due to age and sloppiness and people revving too high, but not all. A lot of people are finiding the front cam bearing looks like crap at the time of the cam swap. I think some of it might have to do with the LT1 water pump.

FWIW, my 10 year old LT1 dyno'ed 300+ ft-lbs from 2000 rpms up with cai and a catback. I don't think there is a significant difference between either. In esp I feel the LS1 is a better choice, however in FS it's about even.

Of course LT1 r&d is not dead by any means. There are stock heads/bottom end cam only LT1's dynoing 350-360 rwhp and running in the 11's. There are some heads and cam 350 ci guys making 420-440 rwhp.