Disappointed with my track result 11.8 @120
06-09-2016, 06:57 PM
#102
Senior Member
Thread Starter
I'm okay with the quarter mile time since my launch wasn't perfect. However, I expected higher trap speed from the original tune.
06-09-2016, 09:23 PM
#103
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05 SL55, 10 C63, 12 SLK350, 20 S560, 08 Bentley, 14 Porsche Cayman S
WOW! Great Lakes Dragway. Brings back a lot of memories. Raced there in the 60s and early 70s. Glad to see that it is still operating. So many have closed.
How about Byron or US30, are they still open?
Hope your Renntech tune works for you, mine is great. I guess I'll have to take it to a track and see what it can do. I know my reaction time won't be what it was.
The only track close to me is a 1/8 mile.
How about Byron or US30, are they still open?
Hope your Renntech tune works for you, mine is great. I guess I'll have to take it to a track and see what it can do. I know my reaction time won't be what it was.
The only track close to me is a 1/8 mile.
06-09-2016, 10:04 PM
#104
Senior Member
Thread Starter
Yes, Great Lakes Dragway is still open and going strong.
Although I never been to Byron, the track is still open.
The car feels much stronger now with the new Renntech tune vs the original tune even though Renntech claims less hp.
Are you Renntech tuned?
Although I never been to Byron, the track is still open.
The car feels much stronger now with the new Renntech tune vs the original tune even though Renntech claims less hp.
Are you Renntech tuned?
Last edited by silvers2k; 06-09-2016 at 10:27 PM.
06-09-2016, 10:23 PM
#105
WOW! Great Lakes Dragway. Brings back a lot of memories. Raced there in the 60s and early 70s. Glad to see that it is still operating. So many have closed.
How about Byron or US30, are they still open?
Hope your Renntech tune works for you, mine is great. I guess I'll have to take it to a track and see what it can do. I know my reaction time won't be what it was.
The only track close to me is a 1/8 mile.
How about Byron or US30, are they still open?
Hope your Renntech tune works for you, mine is great. I guess I'll have to take it to a track and see what it can do. I know my reaction time won't be what it was.
The only track close to me is a 1/8 mile.
06-09-2016, 10:45 PM
#106
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05 SL55, 10 C63, 12 SLK350, 20 S560, 08 Bentley, 14 Porsche Cayman S
The only time I have been back to a drag strip since I stopped racing in 1972 was when my sons took me to the Gator Nationals in Gainsville.
I don't think I will go to the track. Once you do it, it is in your blood and would be very hard to stop racing again. With me it was very addictive.
I don't think I will go to the track. Once you do it, it is in your blood and would be very hard to stop racing again. With me it was very addictive.
06-13-2016, 06:11 PM
#107
Senior Member
Thread Starter
Just a quick update:
I'm happy to report my first two passes were pretty good, and the trap speeds were an improvement from the previous runs: 11.7 @123 and 11.6 @122 respectively.
I will try to upload the video and share my perspective from this experience for those interested in tuning the car.
I'm happy to report my first two passes were pretty good, and the trap speeds were an improvement from the previous runs: 11.7 @123 and 11.6 @122 respectively.
I will try to upload the video and share my perspective from this experience for those interested in tuning the car.
Last edited by silvers2k; 06-13-2016 at 06:16 PM.
06-13-2016, 06:14 PM
#108
Member
Gaining 3-4mph on traps definitely means you're making more power, glad to hear you're happy with the results.
06-13-2016, 06:37 PM
#111
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06-13-2016, 08:43 PM
#113
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2014 E63S; AMS 100 octane ecu tune; edok tcu tune; BB intakes; dyno tuned
06-13-2016, 08:46 PM
#114
MBWorld Fanatic!
I guess, I prefer to fix things when they're wrong. It's almost never a tune that causes the problem, but a problem that already exists.
06-13-2016, 10:01 PM
#117
Senior Member
Thread Starter
Before I could type more my phone died...
I agree, the trap speed can be better but to gain 3mph in quarter mile is pretty significant in my opinion. Previously, I was trapping between 118-120mph with harder launch between 1200-2000rpm. I'm also running all season tires with traction control on. Not sure how much of a difference this would make but something to consider. Sorry in advance for the terrible video (blame my son for that), but hopefully you can see that I didn't launch the car hard at all.
First run: 11.7 @123
I agree, the trap speed can be better but to gain 3mph in quarter mile is pretty significant in my opinion. Previously, I was trapping between 118-120mph with harder launch between 1200-2000rpm. I'm also running all season tires with traction control on. Not sure how much of a difference this would make but something to consider. Sorry in advance for the terrible video (blame my son for that), but hopefully you can see that I didn't launch the car hard at all.
First run: 11.7 @123
06-13-2016, 11:09 PM
#119
Senior Member
Thread Starter
On the third run, I was going to be brave and turn off the traction control/launch the car at 1500rpm. But needless to say, my car threw CEL on the third run and finished the quarter mile in 13.3 @82mph in limp mode. As soon as I finished, I turned off the car and then turned it back on and to my surprise the CEL turned off by itself. Car seemed normal after that.
There were 3 F10 M5's and one of the guys wanted to run against me, so I decided go for the fourth run. For your reference, his best time was 11.4 @126 if I remember correctly (w/Nitto NT05 tires). With that said, I wanted another practice run before I ran against this M5. I was pretty confident that I can do better with the traction control off and launching the car at 1500-2000rpm. Despite my optimism, I ran the quarter mile in 12.5 @118mph (glad I didn't run the M5). This is when I knew something was wrong with the car even though there was no CEL. For some apparent reason, the car felt much slower than the previous two runs. I decided to call it quits and headed home.
On my way back home, I decided to give it some gas to pass up a car that was in front of me and for whatever reason the car all of sudden felt sluggish as if the engine was shutting down. I took the nearest exit and turned off the car again then turned it back on except this time the CEL returned but the car seemed ok. I continued to drive back home with the CEL.
When I got home, I ran the diagnostic using the OBD2 scan tool and found misfire codes. I e-mailed Renntech to see if they can help and received a response right away. Keep in mind, this was on a Sunday. They told me that they would call me first thing Monday morning to help me out in any way they can. As promised, I received a call from Renntech Monday morning and they setup an appointment with my local Renntech dealer to get the car checked out. It's probably the spark plugs, but I'm just glad Renntech didn't try to blame me or the previous tune.
I'll keep everyone posted!
There were 3 F10 M5's and one of the guys wanted to run against me, so I decided go for the fourth run. For your reference, his best time was 11.4 @126 if I remember correctly (w/Nitto NT05 tires). With that said, I wanted another practice run before I ran against this M5. I was pretty confident that I can do better with the traction control off and launching the car at 1500-2000rpm. Despite my optimism, I ran the quarter mile in 12.5 @118mph (glad I didn't run the M5). This is when I knew something was wrong with the car even though there was no CEL. For some apparent reason, the car felt much slower than the previous two runs. I decided to call it quits and headed home.
On my way back home, I decided to give it some gas to pass up a car that was in front of me and for whatever reason the car all of sudden felt sluggish as if the engine was shutting down. I took the nearest exit and turned off the car again then turned it back on except this time the CEL returned but the car seemed ok. I continued to drive back home with the CEL.
When I got home, I ran the diagnostic using the OBD2 scan tool and found misfire codes. I e-mailed Renntech to see if they can help and received a response right away. Keep in mind, this was on a Sunday. They told me that they would call me first thing Monday morning to help me out in any way they can. As promised, I received a call from Renntech Monday morning and they setup an appointment with my local Renntech dealer to get the car checked out. It's probably the spark plugs, but I'm just glad Renntech didn't try to blame me or the previous tune.
I'll keep everyone posted!
06-14-2016, 05:08 AM
#121
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2016 AMG E63S, 2015 Lamborghini Aventador
I would suggest increasing your psi to 39-40psi to increase your time/speed. Also colder plugs.
Thanks for those who chimed in.
Just to be clear, I did brake torque between 1200-1500, S+, comfort suspension mode, 36F/29R psi, traction control on with almost no wheel spin. My son watched from the spectator stand and said the launch looked decent no massive wheel spin. Even with my 2.0 60ft time, I still feel that I should be trapping at around 126mph especially with catless downpipes. As for my reaction time, I didn't care too much for it because it didn't affect the et.
Just to be clear, I did brake torque between 1200-1500, S+, comfort suspension mode, 36F/29R psi, traction control on with almost no wheel spin. My son watched from the spectator stand and said the launch looked decent no massive wheel spin. Even with my 2.0 60ft time, I still feel that I should be trapping at around 126mph especially with catless downpipes. As for my reaction time, I didn't care too much for it because it didn't affect the et.
06-14-2016, 05:38 AM
#122
Super Member
Turning traction off won't add 3-5 mph to a trap.
If you can't run a log and see exactly what is happening, that CEL is telling you start with the plugs/coils. I'd still wager your pcm is yanking your timing, even with this new tune.
If you can't run a log and see exactly what is happening, that CEL is telling you start with the plugs/coils. I'd still wager your pcm is yanking your timing, even with this new tune.
06-14-2016, 09:31 AM
#123
Senior Member
Thread Starter
Back to the trap speed, I feel much better now that I'm trapping between 122-123mph vs 118-120mph.
06-14-2016, 09:40 AM
#124
MBWorld Fanatic!
You're trapping better and throwing codes, honestly you need to fix your car instead of worrying about your tuning. I'm only saying this so you protect your investment.
06-14-2016, 10:57 AM
#125
Super Member
Thanks Mike for the pcm suggestion. I'm going to reset the pcm after I replace the spark plugs tomorrow (oem). Couple of members mentioned that gapping the plugs under .025 resolved the misfire issue, so I'm going to follow this suggestion as well.
Back to the trap speed, I feel much better now that I'm trapping between 122-123mph vs 118-120mph.
Back to the trap speed, I feel much better now that I'm trapping between 122-123mph vs 118-120mph.
I hope any suggestion here points you in right direction, as I'm sure its frustrating. If the pcm is pulling timing, reseting it won't help. It pulls timing to avoid detonation, or what it thinks is detonation.
Back to plugs, if it was spark blowout, which is why you gapp plugs down on FI, it would feel like a big engine breakup, pop-pop-pop sound, as you climbed the rev ladder. Full power, and then car falls on its face.
Either one of those scenarios can throw a misfire code.
GL.
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silvers2k (06-14-2016)
