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18-10-2015, 12:18 PM
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#1 | ||
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Regular Member
Join Date: Mar 2015
Location: Gold Coast, Queensland
Posts: 89
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Hey guys been up to the drags twice recently and i'm pretty disappointed
i have a n/a fg xr6 5 speed auto, now its usually running constant 14.1 - 14.3 with a average of 2.1 60ft. I have changed my rear springs out for very low springs and changed my tires (from ATR Sport 2's to Nitto invo's) (245/35R19) now when i ran a few days ago i was running high 14's to low 15's, i cant seem to launch i just keep wheel spinning, i have an open diff witch doesn't help but with my old tires / springs i could almost launch as hard as i wanted recently i have gone from 2.1 60' to 2.5 60' cant seem to get traction? the tires i have changed to are apparently "high performance" tires at almost $300 each i would expect them to have at least some grip. (Nitto Invo's) Weather i just take off fast or launch at even 2k rpm they will just spin (even on the street taking off quick they wont grip) could this be a cause of bad tires or my rear springs? The springs have almost no movement in them (i always thought that springs can make a big difference on how a car puts power to the ground, hence drag racing suspension you can buy.) could no movement in the rear springs be causing me to spin? I have tried the car at 40psi all the way to 30 psi, cant really go lower as i have to inflate / deflate at the servo as i don't have a pump and don't want to drive on the road with below 30 psi. Cheers guys, any help is very appreciated
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"If Everything Seems Under Control, You're Not Going Fast Enough" - Mario Andretti 2009 Fg Xr6 Sedan n/a 5 Speed Auto - 14.1 @99 MPH Mods: Redback Exhaust & Cold Air Intake Untuned |
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18-10-2015, 01:30 PM
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#2 | ||
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Brad
Join Date: Jul 2010
Location: New Zealand
Posts: 5,827
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Flame suit on.
I ran nitto invos in a 295/30R18 and I cant tell a difference in traction and almost the the Achilles ATR sport I have on now with 245/40R19 don't have any less traction and possibly a touch more. Im keen to throw on a set of 275/35R18 Pilot Super Sports and see how they go. But tbh I was rather un-impresses with the Invos. And I got terrible wear.
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Silhouette BF MKII F6 Plazmaman Intercooler Kit, ID1000, 34mm Internal Wastegate and Turbosmart Actuator, Tein Coilovers, Focal Audio, XXR 521 18x8.5 18x10 |
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18-10-2015, 01:53 PM
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#3 | ||
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Au Falcon = Mr Reliable
Join Date: Sep 2009
Location: North West Slopes & Plains NSW
Posts: 4,076
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Try 22 - 25 psi in the rear tyres, the rear springs sound like they are too stiff for 1/4 mile duties. I would pm Giant, he's got plenty of experience & knows his stuff Imo. Good luck!
cheer's, Maka
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Ford AU Series Magazine Scans Here - www.fordforums.com.au/photos/index.php?cat=2792 Proud owner of a optioned keeper S1 Tickford Falcon AU XR6 VCT - "it's actually a better-balanced car than the XR8, goes almost as hard and uses about two-thirds of the fuel" (Drive.com 2007) |
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18-10-2015, 03:26 PM
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#5 | ||
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FF.Com.Au Hardcore
Join Date: Jul 2006
Posts: 7,331
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How low is low? MM not SSSSSSSSSSSL.
IMO the springs are undoubtedly what's done it. Especially if as you say there's almost no movement, as not only would they be lower but much stiffer. You need a soft rear spring to get the weight to transfer. |
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18-10-2015, 05:37 PM
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#6 | |||
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Regular Member
Join Date: Mar 2015
Location: Gold Coast, Queensland
Posts: 89
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Quote:
__________________
"If Everything Seems Under Control, You're Not Going Fast Enough" - Mario Andretti 2009 Fg Xr6 Sedan n/a 5 Speed Auto - 14.1 @99 MPH Mods: Redback Exhaust & Cold Air Intake Untuned |
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18-10-2015, 07:09 PM
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#7 | |||
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FF.Com.Au Hardcore
Join Date: Jul 2006
Posts: 7,331
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Quote:
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18-10-2015, 06:24 PM
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#8 | |||
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Guest
Join Date: Feb 2007
Location: Gods Country
Posts: 16,258
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Quote:
It's all about the tyres and practice... |
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18-10-2015, 07:09 PM
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#9 | |||
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FF.Com.Au Hardcore
Join Date: Jul 2006
Posts: 7,331
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Quote:
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18-10-2015, 04:58 PM
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#10 | ||
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Regular Member
Join Date: Oct 2014
Location: Perth, WA
Posts: 94
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I would say it's a tire choice issue.
I have Nitto Invo's - 20x 10 - running 295s and I have trouble starting at any rpm without them lighting up in any mode except super gentle on the throttle. My next set of rear rubber will be the Toyo R888Rs.
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XFT Xtreme pack with XFT Stage III Trans and Circle D converter. 20x10x295 Nitto Invo rears (no good on this car), 245 front. E85 507RWKW, BP98 466RWKW. |
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18-10-2015, 06:21 PM
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#11 | ||
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Guest
Join Date: Feb 2007
Location: Gods Country
Posts: 16,258
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Don't stress ... track prep at Willowbank is real hit and miss....
My ETs are still sitting here... Get some 15"s if chasing a number , otherwise stick with daily rubber and NO burnout ! 30psi is low enough to run a 13 on 17" s for me... Mid 14's with 19" s 15 flat with 20"s lol |
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18-10-2015, 06:25 PM
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#12 | |||
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Regular Member
Join Date: Mar 2015
Location: Gold Coast, Queensland
Posts: 89
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Quote:
__________________
"If Everything Seems Under Control, You're Not Going Fast Enough" - Mario Andretti 2009 Fg Xr6 Sedan n/a 5 Speed Auto - 14.1 @99 MPH Mods: Redback Exhaust & Cold Air Intake Untuned |
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18-10-2015, 08:49 PM
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#14 | ||
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Guest
Join Date: Feb 2007
Location: Gods Country
Posts: 16,258
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Yep listen to these guys ....
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19-10-2015, 12:24 PM
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#15 | ||
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FF.Com.Au Hardcore
Join Date: Jun 2010
Posts: 4,760
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My best guess is its the low springs preventing enough rear weight transfer / rear squat.
Did you fit matching shorter shocks? Shorter bump stops? Good chance your riding on the bump stops which is unhooking your rear tyres. We ran a 14.02 on 205 50 16 Nexen rears. Stock XT springs and shorter bump stops 22psi. |
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19-10-2015, 01:22 PM
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#16 | ||
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FF.Com.Au Hardcore
Join Date: Jun 2010
Posts: 4,760
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Invos do suck until worn in. But ATR Sports 2 are no better. So that just leaves the springs.
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19-10-2015, 05:28 PM
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#17 | ||
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Regular Member
Join Date: May 2006
Posts: 36
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Cant say why youve gotten slower, but id only do a tiny burnout to get the water off the tyres, dont get too much heat into them as theyre road tyres and not designed to be red hot
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Wheel Spin Problems Need Advice
Re: Wheel Spin Problems Need Advice
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