xHypex

iTrader: (1)

I've been reading lots of track posts lately and I plan on going to the track right after I install my new suspension (hopefully it'll get rid of my wheel hop). Everyone talks about different launch techniques, shifting, and of course 60's. The thing that bothers me the most are my best slips. My 18"s weigh ~20-21lbs and they have 235/40/18s on them.

Best 60' on 18" 1/8=9.898 (I must have missed a shift )
Best 1/8mi on 18"s 1/8=9.774
Best 1/4mi on 16"s 1/8=10.030

I think my clutch may have been slipping before the 1/4mi run which definitely wouldn't have helped things, but I was really surprised with my 2.181 60' on my 18"s. On my next run at the track I will have modified my JWT to be a hybrid, put in my ACT clutch, and put in shocks/springs so my 60' should get better. I just don't know which wheels to run
-hype

Justin95SE

iTrader: (1)

are those rims lighter than stock, it was my understanding that wheels usually slow you down unless they provide less rotational mass. if this is the case with your wheels then i shouldnt sound stupid. heh heh. yah i dont get it because your 60's were worse with the 18s, please explain to me.

xHypex

iTrader: (1)

Actually my 60's were worse with the 16"s. The only thing I can come up with is the fact that my 18"s are very close to my 16"s in weight but my 18"s have a wider contact patch for my launch. Overall I have no doubt that my 1/4 will slow some with my 18"s, but my 60's with 16"s weren't anywhere near my 60's with 18's. Ennis gets pretty good traction as you can see by the 60' of the Z06 on my 3rd slip.
-hype

Nealoc187

iTrader: (23)

From those 3 timeslips you can't make an accurate decision. Just because you happened to pull a good 60 on your 18s once doesn't mean you will all the time, obviously, as the other two 60' times totally suck (no offense, its obvious you are capable of better though). Do you have more timeslips we can analyze your runs with? If you can, take a look at your 1/8th mile trap speeds. I'm willing to bet that your 1/8 mile and 1/4 mile trap SPEEDS will be better with your 16s.

xHypex

iTrader: (1)

Of 11 runs on my 16s my best 1/8mi times were low 10s. I average more of a 10.2 though.
Of ~25 runs on my 18's my best were 9.7s, but I also got 9.8 and up to 10.2. My average time was probably closer to high 9s or low 10s.
So overall my times are still better on my 18s. Maybe I'll make a spreadsheet later to figure out my average 1/8mi time and average 60's.
-hype

Nealoc187

iTrader: (23)

I am interested in your speeds not times. Whichever wheels show you better SPEEDS are the ones you need to use. If its your 16s that show faster speeds but you have less traction and therefor slower times, you need to work on launching your 16s. If its on your 18s then thats just plain weird in my book, but go with what works.

xHypex

iTrader: (1)

You're right on the speeds thing. Maybe I was just having a bad day, but I was consistantly having a bad day as well. Here's some times with average and such (I threw out the odd ball runs including one time when first didnt engage).
Spreadsheet
The speeds are all about the same, but my highest speed was on my 18"s I bet my speeds would have been faster in the 1/4mi with my 16"s instead of 18"s, but it would still be interesting to see. I wish all these runs had been on 1/4mi, but unfortunately the 1/4mi track wasn't open when I went the first time.
-hype

RedMax95

ill let u borrow my wheels for the track

xHypex

iTrader: (1)

If I wanted to borrow bricks I'd call up Stan so I could borrow his 35lb. momo arrows (that's without tires too)
-hype

RedMax95

fine

Nealoc187

iTrader: (23)

I just did a little fiddling with your spread sheet. Without the two 72mph speeds on your 18" wheels, which honestly look like flukes given the rest of the data, your average mph was 70.633. On your 16s, minus the freak 57 and 62mph speeds, your average is 70.80. Not much difference.

One question, have you been running on your 18s LATELY and were you running on your 16s BEFORE? If so, I think I'd chalk your improved 60 times up to experience rather than the wheels.

Either way, you need to give it some more clutch or less gas off the line, because honestly, those 60' times are absolutely horrible. I assume you're spinning badly, rather than bogging. Whats your launching technique, maybe we can nail down some other technique to help you get those 60' times down.

xHypex

iTrader: (1)

The 16" track times were after my 18" track times so maybe I just forgot how to drive I really don't think that my clutch was in its best condition though so that may have also been a factor. Now I have an ACT so my launch is totally different than it was before. I usually launch low ~2500 because otherwise I get lots of wheel hop especially with my 18"s. After I put in my new shocks/springs I think it will help a lot so I'm going to try for a ~4000rpm launch. Another note on my 16" track times; I put on brand new Kumhos specifically for the track (which didn't seem to help at all).
-hype

Big_Ham

iTrader: (1)

Say what you will, for those of us not racing, nothing looks finer than a set of silver 18" Momo Arrows IMHO ... wish I could get a set under for $2000.

flyry110

GEEZE you guys have good 60' times! i know how to drive, and with my 15's (small i know) i was pullin like 2.8's! i was still pullin in 15.2's though (all i had was getto intake)

RedMax95