As a person who is really interested in the comptech supercharger, I need that little extra excitement to make me blow my load. Ive seen some G-tech times but those were'nt crazy impressive and Its just not the same as those paper slips. I have a G-tech so I know what they're all about. My previous car was an ITR that I g-teched alot till I went to the track for the first time and have'nt used it since. My ITR was pretty heavily modified and ran 12.90s @ 108mph. Its been 1.5 years since Ive had that crazy speed and I want it back. Now that all the bugs are pretty much worked out I'm ready to buy, just need some paper proof to assure myself I'm not wasting a big chunk o money. 12.60s to 12.90s on factory S02s with no other mods would do me in! No real track times have got me thinking that you guys have gone but are too embarrest with the results to post them.

 

I think the problem with getting sub 13 second slips with and SCd s2k will be the differential. You ain't gonna do too many of those with that weakling in the back.

 

Sev is correct. The diff should handle the power (spent some time talking to an RX-7TT guy this weekend), but any hint of wheelhop will frag it. And wheelhop can occur with this rear suspension setup.

Also, most of the SC guys are running stock clutches. Considering the temperment of the clutch with the stock power output, I suspect it will be even more finicky with an extra 100 hp.

I don't doubt that a good driver should be able to put a SC'd S2K into the 12's. More than a few folks have already run well into the 13's stock and the addition of all that extra hp should easily net a 1 second and 10 mph increase.

Look at it this way. With 300 wheel hp, 3600 lbs track weight and 2.0 60 fts on street tires, an LS1 Camaro will run 13 flat, or even in the 12's, at 107-109 mph. The SC S2K makes similar hp, is capable of pulling similar 60 fts and weighs 600 lbs less with driver.

But, if you're waiting for someone to post a slip, I suspect you might be waiting a while.

UL

 

wow...i may have hopped my rears once...is it THAT bad?

 

It isn't good, I can tell you that. Think of it this way. If you drop the clutch without preloading the drivetrain, you are creating a shock load on the entire drivetrain. Apparently, the weak point of the S2K drivetrain is the diff, either the pinion or the LSD.

Now, if you are accelerating at full throttle, and the wheels hop, what is happening? Well, as soon as they leave the ground, the drivetrain is unloaded. Then, when they hit ground again, you shock the drivtrain. So instead of a single shock load, which the clutch absorbs part of, you are getting multiple hammer blows to the rear end. Even worse, the wheels are now spinning, which means additional energy is being imparted.

Essentially, what I am saying, is that even one wheel hop under full throttle is more stressful than a drop clutch launch. Multiple wheel hops...well, you get the picture. This car should be very durable even with clutch drops, especially if you preload the drivetrain a little (very slight engagement before sidestepping, kind of tricky). But if you get wheelhop, you're asking for trouble. That's why live rear axles are so good for drag racing. Wheel hop is very rare.

UL

 

What about a supercharged s2000 with a stage 3 clutch and upgraded differential?

 

[QUOTE][B]No real track times have got me thinking that you guys have gone but are too embarrest with the results to post them.

 

[QUOTE]Originally posted by ultimate lurker
[B] . . .

 

Wesmaster, wheel hop is when the rear end winds up, the suspension squats a bit and then the tires lose traction because of suspension geometry changes. This can cause a pogoing action in the rear end. In mild cases the tires will break free and the suspension unloads, then they'll grab again, wind up the suspension and do it again. In bad cases, often exacerbated by rippled pavement, the tires will actually leave the ground. From what I've seen, on most types of surfaces, the S2K won't wheel hop as long as the surface is smooth. But throw in a couple ripples or rough pavement and you're likely to hear a couple loud "thump,thump" or "bam,bam" sounds from the back of the car. FWD cars are notorious for this because the engine mounts wear and allow the engine to rotate quite a bit, which means there is a lot of stored energy when traction goes and the whole driveline rotates until things grip again.

jahwerx, on anything less than a standing start, I wouldn't worry so much about wheel hop. Why? Because if you start backing out of the throttle at the wrong places, you may spin your car. I'd much rather frag a diff than put the car into the wall and I hate to see you do so trying to avoid wheelhop. A little skip is not going to do the same damage as a multiple hop on a drag style start.

UL

 

[QUOTE][B]In bad cases, often exacerbated by rippled pavement, the tires will actually leave the ground.