Back with another headache >.< - 06 M6
Thread Starter
Safety Car
Joined: Jun 2011
Posts: 4,352
Likes: 32
From: Canton Michigan
Back with another headache >.< - 06 M6
Finally got to the track last night. To get some practice on the car after being built and running right i thought...
Temp was 92 outside. Mild humidity, track temp was around 107
Couple of things were happening - When i went from 3rd to 4th the car was falling on its face and would not accel. Happened muti times. 6/10 runs.. As i was talking to my buddies about gears. We realized I was being forced into 4th at around 103 MPH which is def not right.. As i read from gearing stats should be around 133ish give or take.
I had Mickey thompson Street rs on it 305/45/17s - motor is forged with a ECS 1500SL blower at 14psi spraying meth. Car made 770/552 on dyno on a 94 degree day. My highest trap was 129.5 @ 11.4 2.2 60 i think. and best 60ft was 1.65 100mph 1/8 and 11.3 @ 105 in 1./4 ( 4th goofed up again)
Temp was 92 outside. Mild humidity, track temp was around 107
Couple of things were happening - When i went from 3rd to 4th the car was falling on its face and would not accel. Happened muti times. 6/10 runs.. As i was talking to my buddies about gears. We realized I was being forced into 4th at around 103 MPH which is def not right.. As i read from gearing stats should be around 133ish give or take.
I had Mickey thompson Street rs on it 305/45/17s - motor is forged with a ECS 1500SL blower at 14psi spraying meth. Car made 770/552 on dyno on a 94 degree day. My highest trap was 129.5 @ 11.4 2.2 60 i think. and best 60ft was 1.65 100mph 1/8 and 11.3 @ 105 in 1./4 ( 4th goofed up again)
Safety Car
Joined: Jul 2009
Posts: 3,755
Likes: 190
From: Baton Rouge LA
St. Jude Donor '14, '16
How are you being forced into 4th gear with a manual transmission?
You're right with those tires you should be getting to about 130 at 7k in 3rd gear. The car was falling to about 4200rpm if you were shifting at 103mph which will mean it's making much less power considering you're in a boosted car.
Keep in mind that your speedo will be off if you didn't adjust your tune for the tires so you may have actually been going faster.
You're right with those tires you should be getting to about 130 at 7k in 3rd gear. The car was falling to about 4200rpm if you were shifting at 103mph which will mean it's making much less power considering you're in a boosted car.
Keep in mind that your speedo will be off if you didn't adjust your tune for the tires so you may have actually been going faster.
Last edited by sevinn; Jul 7, 2016 at 04:35 PM.
Thread Starter
Safety Car
Joined: Jun 2011
Posts: 4,352
Likes: 32
From: Canton Michigan
Bc i run out of gear in 3rd and have to shift. So in the video im at 105..when i shifting at 6300.
https://www.youtube.com/watch?v=9UC0...ature=youtu.be
https://www.youtube.com/watch?v=9UC0...ature=youtu.be
Last edited by UmX; Jul 9, 2016 at 08:22 AM.
Safety Car
Joined: Jul 2009
Posts: 3,755
Likes: 190
From: Baton Rouge LA
St. Jude Donor '14, '16
I don't really see anything out of the ordinary. You're short shifting a bit, and with those tall tires unless its tuned for them you're actually going more like 113 at 6300. The tires may just be too tall and you're fighting gearing a bit too much in 4th.
Thread Starter
Safety Car
Joined: Jun 2011
Posts: 4,352
Likes: 32
From: Canton Michigan
When I get my shift light IMA set it to 6500rpm. The tires are 28inch tall.
Drifting
Joined: Feb 2014
Posts: 1,418
Likes: 267
From: Pontiac Quebec
do you have HP Tuners? You need to start data logging your runs. Really helps to see what's going on rather than assuming. With a few logs I could really see when you shift how fast, and what rpm and what speed you're at. something is killing your trap speed because 130 for your power is way low IMO
Also, with a datalog during your runs we can see if the IAT's are in check, A/F ratios with a wideband and also if the car is pulling timing from anything like KR or IAT
Also, with a datalog during your runs we can see if the IAT's are in check, A/F ratios with a wideband and also if the car is pulling timing from anything like KR or IAT
Last edited by rpmextra; Aug 4, 2016 at 01:51 AM.
