My car is Infiniti M37S with 7AT and has installed GTM SC Stage 2. There is also custom exhaust without catalytic converters. I have noticed falling engine speed to 500
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02-12-2014, 07:48 PM | #1 (permalink) |
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M37S GTM SC Stage 2 - falling engine speed
My car is Infiniti M37S with 7AT and has installed GTM SC Stage 2. There is also custom exhaust without catalytic converters.
I have noticed falling engine speed to 500 rpm when car is moving at very low speed and I push and release the accelerator pedal - especially when I drive in traffic jam. It is seen on video: M37S - obroty - YouTube It do not occur when engine is cold. I have checked vacuum lines, BOV. Is this a common issue? What should I check first, next? Thanks, Robert |
02-12-2014, 08:44 PM | #2 (permalink) |
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Are you using the can tune supplied by GTM or a custom one?
I had some what a similar problem, my idle would drop down to 500RPM when at a street light and was on the GTM tune. Had it looked at by a local tuner and we had to tune the fuel to the MAF and dial in those settings.
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02-13-2014, 03:51 AM | #3 (permalink) | |
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I have the custom one.
Quote:
Now I have driven 10.000 km after SC installation. About 2.000 km ago I installed custom exhaust and issue with engine speed appeared at about the same time - but I'm not sure now. Thanks, Robert |
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02-13-2014, 04:26 AM | #4 (permalink) |
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get it retuned? not the same issue as you but when i messed with my stock exhaust my idle started acting funny and started dropping. ended up cleaning out the throttle bodies which solved my idle issues.
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02-13-2014, 06:41 AM | #5 (permalink) |
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Some things to look into: Make sure that you don't have an exhaust leak and get your tune adjusted if it persists.
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02-13-2014, 10:51 AM | #6 (permalink) |
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+1 on exhaust leak
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02-13-2014, 11:50 AM | #7 (permalink) |
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Drives: M37S GTM S/C Stage 2
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Thanks.
1. The throttle bodies were cleaned up. 2. After the custom exhaust were installed we did retuning - fuel and ignition maps were changed. 2. The custom exhaust is 2 x 2,5" with no catalitic converters and six customs mufflers. I do not think that there are leaks, but it has less back pressure than OEM exhaust. 3. I had connected Osiris and did not notice any strange when this issue occurs or I did not know on which parameters should I look. Could you tell me which parameters should be logged or changed? |
02-13-2014, 02:16 PM | #8 (permalink) |
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I'm not too savvy with tuning, but your tuner should be able to make some adjustments that can potentially fix this. I still also say check your exhaust for leaks. I've had a GTM SC kit since 2011 and have encountered some exhaust leaks that have caused similar issues.
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02-14-2014, 07:42 AM | #10 (permalink) |
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Drives: M37S GTM S/C Stage 2
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George, thanks. I will prepare logs and send it to you.
I have tuned ROM from you (GTM) and additional one from Coobcio Garage (Poland). On both this issue occurs. Coobcio's ROM is based on yours - fuel and ignition maps were changed. On yours I have 521 hp, on Coobcio's 570 hp. |
02-14-2014, 07:08 PM | #11 (permalink) |
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Grabba,
This issue only occurred once you changed exhaust, was anything else changed around the same time? Have you tried putting the OEM exhaust back on just to rule out if the exhaust is somehow related. I can't see how an exhaust would create this issue, especially at such a low load site. -George |
02-15-2014, 03:42 PM | #12 (permalink) | |||
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Join Date: Mar 2013
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Drives: M37S GTM S/C Stage 2
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Quote:
Quote:
Quote:
There is log from this ride: https://drive.google.com/file/d/0B-5...it?usp=sharing At the beginning the issue occurs 2 times, later engine speed falls too but not to 500 rpm because speed is higher. From 1:18 to 1:40 this issue occurs several times at speed about 15 km/h. Thanks, Robert Last edited by grabba; 02-15-2014 at 03:52 PM. |
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