Anyone who is having Cold Start Issues
cold start issues
I have a GReddy turbo kit which I used to run on the 370cc injectors at the 370cc tune. Since I upgraded to 650cc injectors and the 650cc tune, the car is very hard to start when it's cold.
I live in FL, so it's not even cold outside. (80+deg)
Needs to be cranked for approximately 7-10 seconds before starting, and when it does start it barely comes to life. It'll putter for a few seconds then run at a high RPM till it warms up and calms down.
I tried taking away fuel at startup and that seems to have made it worse so next time I'm going to add 30% to see if that helps. It's at -15% now and it seems worse.
I didn't look at the coolant temp where it gives problems, but it's about 80-90 deg in the garage where it gives me issues and the time interval where the issues return I'd estimate at about 1.5-2 hours before it gets tough to start again and probably 3-4hrs before it's full on PITA to start.
It happens no matter how full my tank is. It's done it every time since I upgraded to the 650cc injectors.
When I get around to changing it again to add fuel at startup I'll post back and let you all know how that went!
I live in FL, so it's not even cold outside. (80+deg)
Needs to be cranked for approximately 7-10 seconds before starting, and when it does start it barely comes to life. It'll putter for a few seconds then run at a high RPM till it warms up and calms down.
I tried taking away fuel at startup and that seems to have made it worse so next time I'm going to add 30% to see if that helps. It's at -15% now and it seems worse.
I didn't look at the coolant temp where it gives problems, but it's about 80-90 deg in the garage where it gives me issues and the time interval where the issues return I'd estimate at about 1.5-2 hours before it gets tough to start again and probably 3-4hrs before it's full on PITA to start.
It happens no matter how full my tank is. It's done it every time since I upgraded to the 650cc injectors.
When I get around to changing it again to add fuel at startup I'll post back and let you all know how that went!
Sorry for the delay. I datalogged my starting issues, and have yet to get them uploaded to my laptop, but as soon as I do I will post them along with the calibration.Hondata wrote:In your case a return to stock comparison is not possible. A datalog and calibration would help though.
If it helps, my tuner used the CT Stage 2 base calibration as a starting point for my tune.
Cold start issues started immediately after that, and he and I played with the cranking trim but nothing seems to make a difference.
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I've added a section to the help file with more information about the way cranking fuelling works. See http://www.hondata.com/help/flashpro/tu ... g_fuel.htm
Looking at the datalogs, I think the cranking fuel is too low when cold. Here are some changes to test out:
- Return the cranking fuel trim to 0%
- For Race calibrations only, alter the water temperature compensation cranking to:
This should work for both stock and aftermarket injectors.
Looking at the datalogs, I think the cranking fuel is too low when cold. Here are some changes to test out:
- Return the cranking fuel trim to 0%
- For Race calibrations only, alter the water temperature compensation cranking to:
This should work for both stock and aftermarket injectors.
Hondata
Do you think this will work in my situation as well?Hondata wrote:I've added a section to the help file with more information about the way cranking fuelling works. See http://www.hondata.com/help/flashpro/tu ... g_fuel.htm
Looking at the datalogs, I think the cranking fuel is too low when cold. Here are some changes to test out:
- Return the cranking fuel trim to 0%
- For Race calibrations only, alter the water temperature compensation cranking to:
This should work for both stock and aftermarket injectors.
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I will try making the changes you specified above and see if it helps the cold starts. I have also attached my calibration. I'll try and post my datalog of starting up soon.Hondata wrote:I suggest you make the compensation tables changes, and then look at issues specific to E85 & your injectors.
The car runs and starts fine once it's warmed up and has been running great with the attached calibration.
Thank you!
- Attachments
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- 9Aug09FuggiDynoTuneE-85.fpcal
- COMplex's calibration for e85, 3" pulley, RC 650cc injectors, Walbro 255lph pump.
- (72.71 KiB) Downloaded 293 times
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I'm not having any cold start issues at all so I figured I would post up a log and calibration for Hondata to use for comparison. I hope this helps.
I'm running a modified GReddy kit with RC 650 injectors and a Walbro pump for a fuel system. I have a couple cold start logs.
I'm running a modified GReddy kit with RC 650 injectors and a Walbro pump for a fuel system. I have a couple cold start logs.
- Attachments
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- 10-15 cold start.fpdl
- (5.73 KiB) Downloaded 335 times
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- soxfan_gt28 second round vtec and cam adj.fpcal
- (17.64 KiB) Downloaded 316 times
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- 10-13 cold start.fpdl
- (7.19 KiB) Downloaded 334 times
Please see the attached cold start datalog to go along with my previously attached calibration.Hondata wrote:In your case a return to stock comparison is not possible. A datalog and calibration would help though.
Let me know what you think... Tonight I will test the changes I just made to the compensation tables and report back.
Thank you!
- Attachments
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- COMplex_coldstart.fpdl
- Cold starting, to go along with my calibration: 9Aug09FuggiDynoTuneE-85.fpcal (attached in previous post)
- (51.24 KiB) Downloaded 295 times
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Hondata wrote:I've added a section to the help file with more information about the way cranking fuelling works. See http://www.hondata.com/help/flashpro/tu ... g_fuel.htm
Looking at the datalogs, I think the cranking fuel is too low when cold. Here are some changes to test out:
- Return the cranking fuel trim to 0%
- For Race calibrations only, alter the water temperature compensation cranking to:
This should work for both stock and aftermarket injectors.
I'm going to try this out aswell i'll let the car sit over night as it's -5C here now, and see what happens!
Compensation table changes (per the tables above) didn't seem to make any difference for me :(
fuel trim is currently +25%
cranking fuel trim is +10%
rc 650cc / e85 / walbro 255 / 50~F ambient temp
hmm...
fuel trim is currently +25%
cranking fuel trim is +10%
rc 650cc / e85 / walbro 255 / 50~F ambient temp
hmm...
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did the added changes to the map without any success :( well it made it start a hair sooner but the problem is still very bad, heres my datalogs. I have included all three from that day cuz I can't remember the one cold start log.
- Attachments
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- log-01.fpdl
- (1.53 MiB) Downloaded 277 times
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- log-02.fpdl
- (131.02 KiB) Downloaded 260 times
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- log-03.fpdl
- (1.53 MiB) Downloaded 274 times
Spunkster wrote:You must post the calibration as well
here you go
- Attachments
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- K20Z3 CT-e Supercharged.fpcal
- (17.4 KiB) Downloaded 264 times