djr81 Posted March 6, 2021 Report Share Posted March 6, 2021 I have had a G4+ ECU installed in my 32 GTR. It goes ok however after getting back from the tuna there are three issues: The aircon doesn't work any more. I assume I need to check the output from the climate control computer to the Link ECU to see if it is receiving the signal as it doesnt show up when plugged into the lap top. Are there any known issues with the aircon and the Link? The motor is terribly laggy between gear changes. Is this an internal MAP sensor (lack of proximity to the manifold) issue or a tuning issue? Light misfire in the first few kms of travel. Best dealt with with some enrichment? Sorry for the basic questions. Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 6, 2021 Report Share Posted March 6, 2021 Will need to see a log and tune. RB26's with ITBs are usually tuned using throttle position as the main fuel table look-up so MAP will have little influence. For the AC, are you saying you are not seeing DI4 status change when switching the AC on? Quote Link to comment Share on other sites More sharing options...
djr81 Posted March 6, 2021 Author Report Share Posted March 6, 2021 Thanks for the prompt reply. That is correct about the lack of a status change. Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 6, 2021 Report Share Posted March 6, 2021 Check the pull-up is enabled on DI4 is about the only thing that could have an effect on the AC request in the software. Assuming it is then there is a problem upstream somewhere. Pin 46 is the request signal from the AC unit, I believe it should be ground when the switch is on. Quote Link to comment Share on other sites More sharing options...
MichaelR32GTR Posted March 9, 2021 Report Share Posted March 9, 2021 Mine does same thing Adam setup anti lag for me which In my tune file which I haven’t gotten around to testing Should have results this weekend at roll racing Hopefuly Quote Link to comment Share on other sites More sharing options...
djr81 Posted March 13, 2021 Author Report Share Posted March 13, 2021 A run up second third, fourth. The thing behaved itself from a cold start so Ill have to try again tomorrow with that. Havent had time to check the air con signal. Run up log 210413.llg G4+ R32 Albany.pclr Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 13, 2021 Report Share Posted March 13, 2021 Unfortunately you car has been mapped using MGP as the look-up on the fuel table, this generally doesnt work well on ITB cars and I have never seen an RB26 have stable fuel control when mapped this way. You can see you barely have any vacuum even with a very small amount of throttle so your AFR is going to be all over the show when off boost. This is the reason our GTR base map is set up with TP as the load axis, its really going to need to be changed and the fuel table re-tuned. It kind of suggests the tuner may be lacking experience too if he has overlooked such a well known and often discussed ITB tuning fundamental. Quote Link to comment Share on other sites More sharing options...
Ben C Posted March 13, 2021 Report Share Posted March 13, 2021 That's verging on money back type mistake. Hope they sort it without much hassle Quote Link to comment Share on other sites More sharing options...
djr81 Posted March 13, 2021 Author Report Share Posted March 13, 2021 Well I’m not going to lie - that is more than a little disappointing. In any case, thanks for the help. Quote Link to comment Share on other sites More sharing options...
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