MichaelR32GTR Posted February 11, 2018 Report Share Posted February 11, 2018 Hi all ive got an rb26 engine in my r32 Gtr with a Hypertune intake plenum and 90mm throttle body i have been battling very poor cold start issues since day one, it runs the factory AAC valve under the plenum, idle once warm is a nice solid 1100rpm which is perfect with my big 280 cams cold start in the morning will usually be only a few hundred rpm so I need to hold the throttle open until it gets to operating temp then it will maintain idle also another issue is when the AC is on the idle drops very low and wants to stall does anyone have any any tips or info as to what I can do or try to get this sorted or is this the trade off for using a big single throttle body and not the factory 6 throttle setup? any info would be much appreciated thanks Quote Link to comment Share on other sites More sharing options...
Adamw Posted February 11, 2018 Report Share Posted February 11, 2018 I would expect you should be able to get reasonable idle control with a set up like this. Most likely just a tune issue. Can you log a cold start and post that and your map here so we can take a look. This video is for G4+ but the logging setup for the V series is very similar: https://www.youtube.com/watch?v=_P1LRANeO4A Quote Link to comment Share on other sites More sharing options...
MichaelR32GTR Posted February 11, 2018 Author Report Share Posted February 11, 2018 Sure thing I will get a log and post it up along with my map sometime this week thanks Quote Link to comment Share on other sites More sharing options...
MichaelR32GTR Posted February 12, 2018 Author Report Share Posted February 12, 2018 here is my current tune map will get cold start log hopefuly tomorow... gtrtune655kw.pcl Quote Link to comment Share on other sites More sharing options...
MichaelR32GTR Posted February 14, 2018 Author Report Share Posted February 14, 2018 hi adam, here is my cold start log, thanks cold start log.llg Quote Link to comment Share on other sites More sharing options...
Adamw Posted February 14, 2018 Report Share Posted February 14, 2018 Ok, the problem during cold start is the idle valve is already fully open, so it cant open any further to bring the RPM up to the target idle. You base table suggests it also needs to be 50% open even for normal warm idle so it seems when it was set up originally the throttle blade stop was too far closed. You are going to have to wind the throttle stop in some more and then retune the idle control settings. I can help you do it on here but it is going to take a few logs and backwards and forwards tweaks to get it working reasonable. It might be easier if you can get wifi access near your car then I can log in via teamviewer and set it up live. Email me at if you want to arrange a time to do that. Quote Link to comment Share on other sites More sharing options...
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