[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

[Tommy R]

Hey fellas,

Okay, Jason (Soma07), how do you know me? And how do you know my language? (IMG:http://www.frrax.com/rrforum/style_emoticons/default/tongue.gif)

Sammy, yes, 'tis me. I'm certainly not decided, but I'm considering a swap from co-driving the Scirocco in FSP to moving back into a pony car in F-Stock. And, yes, this means I'd be selling the (potentially STX or DSP) 325is I was slowly prepping. Of course, nothing is set in stone yet as I'm merely in the data acquisition phase at the moment. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/smile.gif)

Anyway, on to the questions.........

'93 models: I'm still undecided. The gearing is better with the "old" T-56 and 3.23's. Second is effectively 6.9:1, whereas the later models are 6.1:1 which I thought was interesting. However, I'm not fond of a "single year production" vehicle with unique/troublesome concerns. Speed density and eventual mod-ability is a concern. And is batch firing true with this model? I didn't know the front brakes were different, too!

LT1 vs. LS1: Smaller steering wheel in the LT1, huh? Interesting. It sure appears that the LT1 has the stronger low end torque and obviously the LS1 has the horsepower. But, I'm not going the LS1 route. The LT1 is certainly cheaper, plus it's still very nationally competitive. A win/win. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/wink.gif) And the braking issue with the LS1 is a serious one to consider, IMO. I've experienced and seen that wheelhop. It can be quite violent.

Weight: Does the LS1 carry a lack of weight compared to its iron block counterpart? If so, how much? For that matter, what's an FS class F-body weigh in at? Are theZ28's lighter than the Formulas? No T/A's for me, FWIW.

Suspension: Any differences among the years of LT1 cars? Obviously a 1LE isn't necessary to win. Any spring rate differences over the years? Sway bar/bushing differences?

Non-performance stuff: I know the Optispark can be an issue. And changing plugs/wires requires an act of Congress. But, what about the other "mundane" maintenance issues? T-56's and the rear ends seem to hold up well to anything, but drag slick launches. The LT1 sure seems plenty robust. What about steering racks, A/C compressors, window motors, electrical issues, fit-n-finish after 100k miles, etc.? I need to consider the whole package and potential repair costs and daily nuisances are a real consideration. I don't expect BMW interior quality, but just how bad does it get?

FWIW, I'm expecting the suitable candidate to have 100k+ miles. At that point I'm sure it'll be needing lots of maintenance, if not already done. Are bushings a PITA?

Diffs: Are all LT1's equipped with some sort of posi? Are they Auburns? I understand the LS1's came with Torsens, but even they have shown to be far from flawless. Do the Auburns wear and need replacement every few years? Suggestions here?

Thanks,
Tommy