Wheel hop at the strip broke ????

[McAttack]

VERY bummed about this. On my 3rd run at the strip last Friday night, I got a terminal case of wheel hop. Thought I could ride it out but something gave. Had it towed to the shop but they can't get to it for a few more days. I'm goin' crazy trying to think of what broke. I had 285/30/18 S03's in the rear w/20psi in the tires. (I did do a burnout as well). Have (had?) a CT PG II clutch w/a little over 2500 miles on it.

There's a scraping as I release my foot from the clutch. I can shift all gears but car no go. I wasn't sure if it may be the differential gears? Does this sound like the clutch? Not for nothing but I'd be pretty shocked if it was. The PG II has a good rep and I did break it in.

I wanted to go to the strip one more time this month but if it's the clutch, that's out. Any thoughts?

Thanks in advance

 

[true]

Originally posted by McAttack:
VERY bummed about this. On my 3rd run at the strip last Friday night, I got a terminal case of wheel hop. Thought I could ride it out but something gave. Had it towed to the shop but they can't get to it for a few more days. I'm goin' crazy trying to think of what broke. I had 285/30/18 S03's in the rear w/20psi in the tires. (I did do a burnout as well). Have (had?) a CT PG II clutch w/a little over 2500 miles on it.

There's a scraping as I release my foot from the clutch. I can shift all gears but car no go. I wasn't sure if it may be the differential gears? Does this sound like the clutch? Not for nothing but I'd be pretty shocked if it was. The PG II has a good rep and I did break it in.

I wanted to go to the strip one more time this month but if it's the clutch, that's out. Any thoughts?

Thanks in advance

There's not to many things it could be...either the differential, clutch, or drive axles....as long as you really are getting it into gear. (rule out shift linkage) I would be suprised if it was the clutch too. Sounds like the clutch is disengaging. When you let it out you hear the scraping.. I'd vote for differential or cv axles.... I've never seen a cv axle break unless a 6 puck or harsher clutch was used though.. You should be able to pull on the axles to see if they are in tact.


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jack of all trades, master of some.

 

[Sig]

What were your times for the first two runs?
Did you use your spray on top of the SC?

Sorry to hear about your problem, good luck getting it worked out.

Jason

 

[McAttack]

Originally posted by true:
There's not to many things it could be...either the differential, clutch, or drive axles....as long as you really are getting it into gear. (rule out shift linkage) I would be suprised if it was the clutch too. Sounds like the clutch is disengaging. When you let it out you hear the scraping.. I'd vote for differential or cv axles.... I've never seen a cv axle break unless a 6 puck or harsher clutch was used though.. You should be able to pull on the axles to see if they are in tact.

What would be the BEST thing I can hope for?

 

[McAttack]

Originally posted by Sig:
What were your times for the first two runs?
Did you use your spray on top of the SC?

Jason

1st run was 13.6 @109 mph w/a, ahem, 1.65 R/T....DOE!

2nd run was 13.3 @ 107 mph w/a .60 R/T

Knocked a second off my 1st R/T but hit the rev limiter in 2nd AND 3rd gears.

Since I intended to use the 1st 2 runs as a warm up, I didn't get to use the NOS.

Hopefully next time....

 

[true]

Originally posted by McAttack:
What would be the BEST thing I can hope for?

I would be hoping for broken CV. If it's a differentail or clutch your trans needs to come out. If its a diff, it's gonna be very costly...not sure how easy it would be to source a used differential..might end up needed a new trans. A CV shaft should be easily replaced.

By the way, what was your 60ft. time?

[This message has been edited by true (edited 06 August 2002).]

[This message has been edited by true (edited 06 August 2002).]

 

[McAttack]

Originally posted by true:
By the way, what was your 60ft. time?

For the 2nd run, 60ft. was 2.1 s. I think if I didn't screw up on the rev limiter TWICE I could have hit 11's. My goal was 11.3 w/CTSC 9psi and 50 NOS (and perfect reflexes!)

Thanks for your input

 

[Si]

Macattack,

What you have described happened to me before in my turbocharged Miata - same sound, same thing with the gear (being able to shift into all gears but car no go), and it was the differential gears.

 

[McAttack]

Originally posted by Si:
Macattack,

What you have described happened to me before in my turbocharged Miata - same sound, same thing with the gear (being able to shift into all gears but car no go), and it was the differential gears.

I'm afraid to ask....how much $$$$ to replace this on an NSX? Anything aftermarket that may be stronger?

 

[Number9]

Sorry to hear about the incident. From the cup-is-half full perspective though, if it turns out to be the diff and you didn't already do the 4.55 R&P, might be good time to do that. Best of luck.

 

[McAttack]

Originally posted by Number9:
Sorry to hear about the incident. From the cup-is-half full perspective though, if it turns out to be the diff and you didn't already do the 4.55 R&P, might be good time to do that. Best of luck.

Ha! Ha!

Another eternal optimist! I love it! That was my thought too!

 

[nsxbadboy]

Reaction time has nothing to do with your E.T.The clock doesnt start until you cross the starting line.You could sit there for 5 minutes and still run a 13.xx.

Joe

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97 NSX-T BBSC Spa Yellow
93 Supra TT T-61
97 Viper GTS w/Corsa,K/N

 

[W]

Originally posted by McAttack:
1st run was 13.6 @109 mph w/a, ahem, 1.65 R/T....DOE!

2nd run was 13.3 @ 107 mph w/a .60 R/T

Knocked a second off my 1st R/T but hit the rev limiter in 2nd AND 3rd gears.

Since I intended to use the 1st 2 runs as a warm up, I didn't get to use the NOS.

Hopefully next time....

If you hit the rev limiter in 3rd and trapped at 107, then it sounds like you have short gears, right? Anyways, if you are expecting an ET of 11.3 then you should be trapping around 120. That means, with the 4.55, you are almost at the end of 4th. It's optimum for your current setup/expectations, but it will limit you should you want to go faster. How about the the 4.235 because you can trap around a second faster before it runs out in 4th. That's low to mid 10's!

 

[nsxbadboy]

Originally posted by W:
If you hit the rev limiter in 3rd and trapped at 107, then it sounds like you have short gears, right? Anyways, if you are expecting an ET of 11.3 then you should be trapping around 120. That means, with the 4.55, you are almost at the end of 4th. It's optimum for your current setup/expectations, but it will limit you should you want to go faster. How about the the 4.235 because you can trap around a second faster before it runs out in 4th. That's low to mid 10's!

Umm is this a joke? Trap speed is indicative of horsepower.Changing your final drive ratio is not going to get you a higher trap.If you want to go faster you must get some tires and cut your 60 ft down to at least 1.7-1.8 range.That 3/10's will net you a high 12 at best.With a trap speed of 109 off the rev limiter,the best you can hope for is a mid 12 @ 113-114 with a 50 shot.

Joe

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97 NSX-T BBSC Spa Yellow
93 Supra TT T-61
97 Viper GTS w/Corsa,K/N

[This message has been edited by nsxbadboy (edited 07 August 2002).]

 

[McAttack]

Originally posted by nsxbadboy:
Umm is this a joke? Trap speed is indicative of horsepower.Changing your final drive ratio is not going to get you a higher trap.If you want to go faster you must get some tires and cut your 60 ft down to at least 1.7-1.8 range.That 3/10's will net you a high 12 at best.With a trap speed of 109 off the rev limiter,the best you can hope for is a mid 12 @ 113-114 with a 50 shot.

Joe

Currently, I do not have short gears (although it looks like I'm gonna need new ones anyway).

Joe, I believe I can do mid 11's. I realize R/T has nothing to do with my ET. I mentioned it in passing. I pulled my time slip and my 60' was 2.032

With 352lbs of torque, 423.1 hp at the wheels and 2860lbs weight, if I shift well I think an 11.3 is doable. "Time will tell.."

 

[McAttack]

Originally posted by true:
I would be hoping for broken CV. A CV shaft should be easily replaced.....

[This message has been edited by true (edited 06 August 2002).]

CV IT IS! Looks like the towing will end up costing more than the repair.

 

[Sig]

Congrats on your damaged CV! There are few times that we find ourselves cheering a problem with our cars. But given the different things that could have been damaged, it looks like you ended up with the lesser of evils.

 

[McAttack]

Originally posted by Sig:
Congrats on your damaged CV! There are few times that we find ourselves cheering a problem with our cars. But given the different things that could have been damaged, it looks like you ended up with the lesser of evils.

I just got off the phone w/ my mechanic. He said to replace both shafts w/cv boots will run me about $1800. in parts. Labor extra.

I'm not sure, does this sound high? Anyone?

 

[Sig]

Was there a problem with the other one too?

I am not exactly a mechanic, but I would think that if there are not any problems with the other side that it should not have to be replaced. Is there value in having both sides replaced even if one side is fine?

 

[robr]

dont forget, whatever you need for parts, you get a heck of a discount if you buy them from niello. get a list of what you need and try to have them match niello's prices, or tell them you will just purchase the parts yourself. don't let them screw you more than they can

.

 

[nsxbadboy]

Originally posted by McAttack:
Currently, I do not have short gears (although it looks like I'm gonna need new ones anyway).

Joe, I believe I can do mid 11's. I realize R/T has nothing to do with my ET. I mentioned it in passing. I pulled my time slip and my 60' was 2.032

With 352lbs of torque, 423.1 hp at the wheels and 2860lbs weight, if I shift well I think an 11.3 is doable. "Time will tell.."

I hate to say it but congrats on the busted CV.

The lesser of 2 evils.423 rwhp is damn impressive and will definitely get you 11's.Get some tires and keep me posted.

Joe



------------------
97 NSX-T BBSC Spa Yellow
93 Supra TT T-61
97 Viper GTS w/Corsa,K/N

 

[W]

Originally posted by nsxbadboy:
Umm is this a joke? Trap speed is indicative of horsepower.Changing your final drive ratio is not going to get you a higher trap.If you want to go faster you must get some tires and cut your 60 ft down to at least 1.7-1.8 range.That 3/10's will net you a high 12 at best.With a trap speed of 109 off the rev limiter,the best you can hope for is a mid 12 @ 113-114 with a 50 shot.

Joe

Uh, not a joke. I don't know where you read that I was implying that changing the final drive ratio would raise your trap speeds, although it could but that's a pretty pointless debate. The whole key to my post was that finishing at the top of 4th gear is usually optimal in the 1/4 mile, and that shifting into 5th is not a good ideal at all.

How do I explain this? If he goes any faster than his current hopeful 11.3, than he would be shifting into 5th with the 4.55. It would be better if he was still in 4th, hence my statement to consider the 4.235.

 

[Nimbus]

For my 6sp + 4.55R&P I always shift into 5th just before the end of the 1/4 because I run out of revs in 4th. I do have a 6psi CTSC.

 

[Nimbus]

Originally posted by McAttack:
I just got off the phone w/ my mechanic. He said to replace both shafts w/cv boots will run me about $1800. in parts. Labor extra.

I'm not sure, does this sound high? Anyone?

McAttack, sorry to say this but $1800 is very high...

 

[Sig]

What is the mph at the end of 4th gear in a 6speed w/ 4.55 and the standard differential?

Nimbus-
Out of curiousity, what ET's are you getting when you run?