Hot starts, injectors, ecu, what?
06-09-2008, 08:11 AM
#41
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I have the problem ( utec, rc 550cc injectors and 3.5 bar FPR ), I´m really tired of this issue , and the solution is get a EMS like Haltech , F-con , etc , or reflash the ecu for bigger injectors , or wait a little for the new UP-REV software......
The problem here is the cranking injectors time......
The problem here is the cranking injectors time......
06-09-2008, 09:19 AM
#42
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Originally Posted by KPierson
How big are the injectors?
06-09-2008, 03:36 PM
#43
Originally Posted by craigo'sznprgrs
Who tuned your car?
http://www.preracing.com/
06-09-2008, 05:57 PM
#44
Haltech, HKS 1000 cc injectors, hot starts were never a problem. Starts just like stock - immediately. Cold starts used to take 2 cranks (no gas required), with a little fine tuning, it only takes 1 but the first crank is not quite perfect yet (at about 1-2 seconds it starts to die a little, but then picks back up).
Haven't had a chance to play with it too much but I know there's a cold start enrichment that lets you adjust fuel at specified time intervals after cranking begins (offset % from base fuel table)... It's a little bit of a stab in the dark since you can't get an A/F reading until the O2 sensor warms up (15 seconds for me).
Haven't had a chance to play with it too much but I know there's a cold start enrichment that lets you adjust fuel at specified time intervals after cranking begins (offset % from base fuel table)... It's a little bit of a stab in the dark since you can't get an A/F reading until the O2 sensor warms up (15 seconds for me).
Last edited by rcdash; 06-09-2008 at 05:59 PM.
06-09-2008, 06:04 PM
#45
Raj, let me know about this stuff 
The HKS injectors are nice and don't give any problems when dialed in.
A little more prime pulse and cranking injector will make it start immediately. Then add a little fuel from 2-5 seconds after engine start in the 'post-start' fuel table.
The HKS injectors are nice and don't give any problems when dialed in. A little more prime pulse and cranking injector will make it start immediately. Then add a little fuel from 2-5 seconds after engine start in the 'post-start' fuel table.
06-10-2008, 07:08 AM
#47
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Originally Posted by Jay'Z
How would a reflash fix this?? If this is true id send my ecu to uprev again for this!!
06-10-2008, 10:04 AM
#48
Originally Posted by Hal@IP
Raj, let me know about this stuff The HKS injectors are nice and don't give any problems when dialed in.
A little more prime pulse and cranking injector will make it start immediately. Then add a little fuel from 2-5 seconds after engine start in the 'post-start' fuel table.
The HKS injectors are nice and don't give any problems when dialed in. A little more prime pulse and cranking injector will make it start immediately. Then add a little fuel from 2-5 seconds after engine start in the 'post-start' fuel table.
Thanks though - I don't want to waste your time with trivial stuff when you've got really cool stuff coming out that better deserves your attention. 
06-10-2008, 11:47 AM
#49
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Originally Posted by captj3
That is very strange. I've had my utec for a year now with my aps tt and never had a problem starting. Are you still using the aps fuel set up?
+1 never an issue with my Utec and APS injectors on warm/hot starts. Still have the UTEC but now have DW 600 injectors and every now and then I have an issue with warm starts, but not a big deal.
06-10-2008, 12:30 PM
#50
Originally Posted by al_v
You need to reflash the ECU for bigger injectors , this would reduce the cranking injector times , and this would solve all that hot starts issues.
06-10-2008, 12:39 PM
#51
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Originally Posted by 05Z33
So if we reflash the ECU for larger injectors, do we need to retune the utec as well or leave it as is?
06-10-2008, 02:27 PM
#53
Originally Posted by leeboyNY
I have HKS low impedance 1000cc, f con v pro, GTM ECU reflash and no problem with hot starts.
I miss my car
06-10-2008, 04:52 PM
#54
Originally Posted by 05Z33
Jeremy at PF is my tuner, so I'll have to have him do it for me. I wish I knew how to do my own tunning. I'll just wait till I upgrade my pulley before I have the reflash and retune.
07-04-2008, 04:48 AM
#57
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I also have a UTEC with my APS TT kit and it starts really quick, hot or cold. In fact, it starts the same as when I had the Unichip. I'm still running the APS supplied injectors for now.
07-04-2008, 04:54 AM
#58
Originally Posted by Madelinot
I also have a UTEC with my APS TT kit and it starts really quick, hot or cold. In fact, it starts the same as when I had the Unichip. I'm still running the APS supplied injectors for now.
07-04-2008, 07:37 AM
#59
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Originally Posted by Jay'Z
Do you have huge 750cc like me?? What is your fuel map looking like at the 0 column?
You need to step up to a real EMS I have 1000cc injectors and cold and hot startups with the Fcon are fine
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