Had some issues at the track today
#1
Had some issues at the track today
so after getting my car tuned at the dyno i figured it was time to so how she'd do at the track.
i had about 5 runs (ill post the timeslips tomorrow). my best run was 13.8 at 106. the rest where all in the 14s even a 15. but my trap speeds are pretty consistent(within acouple mph). my 60 foots are what killed me every time, i would catch up as soon as i got outa the whole.
i was trying out my new drag radials(BF Goodrich g-force t/a drag radial 225/45r17 on 6th gen SL 17s) but they made so much wheel hop i couldnt do anything but lay off alittle and it would bog. i was going alittle easy, slipping the clutch from 2000-3000rpm but i couldnt get over the wheel hop. BTW i have energy mounts and i filled the side mounts
do you guys think i should be dumping the clutch from like 4000-4500rpm? . i was trying to think about what could be causing it, my shocks/struts are in tough shape....
my mods are
obx headers,test pipe,catman catback,berk intake, nwp spacers and BOP, safc tuned, wet 75 shot, 06 350z clutch/flywheel, energy f/r motor mounts, poly filled side mounts, engery shifter bushings, homemade oil catch can,bf goodrich drag radials, maxspeed springs
i had about 5 runs (ill post the timeslips tomorrow). my best run was 13.8 at 106. the rest where all in the 14s even a 15. but my trap speeds are pretty consistent(within acouple mph). my 60 foots are what killed me every time, i would catch up as soon as i got outa the whole.
i was trying out my new drag radials(BF Goodrich g-force t/a drag radial 225/45r17 on 6th gen SL 17s) but they made so much wheel hop i couldnt do anything but lay off alittle and it would bog. i was going alittle easy, slipping the clutch from 2000-3000rpm but i couldnt get over the wheel hop. BTW i have energy mounts and i filled the side mounts
do you guys think i should be dumping the clutch from like 4000-4500rpm? . i was trying to think about what could be causing it, my shocks/struts are in tough shape....
my mods are
obx headers,test pipe,catman catback,berk intake, nwp spacers and BOP, safc tuned, wet 75 shot, 06 350z clutch/flywheel, energy f/r motor mounts, poly filled side mounts, engery shifter bushings, homemade oil catch can,bf goodrich drag radials, maxspeed springs
Last edited by allblackmax96; 04-30-2010 at 10:24 PM.
#5
i think i will trap a higher mph with a better launch. even my 13.8 run had problems(2.4 60foot), so i know i have a lot of room for improvement, id like to see a 12 of some sorts @110ish. sparks did it with a similar setup...
#8
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You also have a major tire disadvantage. I was running 24.5x8x15" slicks for those mid 12s, and I now have 225/50/15 hoosier DRs (cheater slicks) which seem to hook even better...
The wheel hop is a side effect of our suspension with stock bushings giving it a lot of forward travel + you spinning the tires. Did you change the pressure in your DRs? Were you spraying off the line? You should be able to dead hook N/A even with those 17" DRs then start spraying after you're hooking good in 2nd gear. I was able to spray off the line with slicks. Most DRs on a FWD car like 18-19PSI, but that will vary.
Get aaron's torque link and new control arm bushings and you should see a night and day improvement in wheel hop when you do spin.
#9
way too much RPM/not enough clutch slip on the launch. you need to use less RPM or more clutch modulation, or both. those tires do not have the traction to hold on with a launch at that RPM without a ton of clutch slip.
#14
i had the nitrous ready to spray but it doesnt spray untill 100% throttle so it didnt spray untill i was fully into it, once i got outa the whole, i had no traction problems, i had limited options for tires (6th gen bbk).
i think i ran a 9.0 1/8, all my problems were outa the whole so...
my tires are at 18psi
i guess i just need more practice with my clutch work, my 350z clutch grabs alot quicker than my oem clutch. the last time i ran the car was when it was bone stock (14.6) so i had my hands full to say the least.
i think i ran a 9.0 1/8, all my problems were outa the whole so...
my tires are at 18psi
i guess i just need more practice with my clutch work, my 350z clutch grabs alot quicker than my oem clutch. the last time i ran the car was when it was bone stock (14.6) so i had my hands full to say the least.
Last edited by allblackmax96; 05-03-2010 at 09:41 PM.
#15
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i had the nitrous ready to spray but it doesnt spray untill 100% throttle so it didnt spray untill i was fully into it, once i got outa the whole, i had no traction problems, i had limited options for tires (6th gen bbk).
i think i ran a 9.0 1/8, all my problems were outa the whole so...
my tires are at 18psi
i guess i just need more practice with my clutch work, my 350z clutch grabs alot quicker than my oem clutch. the last time i ran the car was when it was bone stock (14.6) so i had my hands full to say the least.
i think i ran a 9.0 1/8, all my problems were outa the whole so...
my tires are at 18psi
i guess i just need more practice with my clutch work, my 350z clutch grabs alot quicker than my oem clutch. the last time i ran the car was when it was bone stock (14.6) so i had my hands full to say the least.
#16
What was your 1/8 mile trap speed?
I have a ceramic 6-puck and it's a pita to try to slip. Good thing I have slicks.
Yeah it took a lot of adjustment/practice for me to get used to launching on the ceramic 6-puck clutch since it's basically on/off. You definitely want to slip the clutch though, the only time you would dump it is with amazing track prep and traction, which you probably won't get on those 17s.
#17
Why did you put DR's on heavy *** 17s? That is my first question.
I typically launch my car from ~2400 on my new tires and feather it for just a sec and it dead hooks..sounds like you need a lot more practice. Also, the 45 series sidewall is not helping you..
I typically launch my car from ~2400 on my new tires and feather it for just a sec and it dead hooks..sounds like you need a lot more practice. Also, the 45 series sidewall is not helping you..
#18
because i got both of them for 50 bucks on craigslist and i have 6th gen front brakes so i cant run smaller than 17s. i'm more worried with traction(nitrous) than weight, its my daily driver, i want the best of both worlds, if i have to give up some time for a better daily ride, im ok with that.
launching street tires and drag radials is completely different(if thats what your talking about with launching). i have brand new sumitomo htr zIIIs for daily driving which grip very well and im not ashamed to say im not instantly running 12s with my drag radials, i need practice and i know that. i wasnt sure how the tires would react, i will prob be going back up in 2 or 3 weeks, hopefully i see some good results.
launching street tires and drag radials is completely different(if thats what your talking about with launching). i have brand new sumitomo htr zIIIs for daily driving which grip very well and im not ashamed to say im not instantly running 12s with my drag radials, i need practice and i know that. i wasnt sure how the tires would react, i will prob be going back up in 2 or 3 weeks, hopefully i see some good results.
#20
practice first, parts later. if you don't have the driving skill/practice situation hammered out, no amount of parts/money you throw at the car is going to turn times from mediocre to respectable.
#22
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I don't even run a 55 sidewall on my 15" drag radials, lol.
I completely agree. You should be able to pull very respectable '60 foots on those current DRs with practice.
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