Ian C Posted July 30, 2012 Share Posted July 30, 2012 If you could datalog everything when you try and start it and it actually lumps into life, that'd be handy. Knowing what the stock ECU is pumping out as duty cycle, what adjustments the EMU thinks it should do, and what the end result is would be very telling as to what's going on. Sounds like it's trying to put way too much fuel in. I used the water temp adjustment map to remove up to 20% duty when the coolant is cold. How much duty are you pulling and how much have you scaled the airflow signal back for 0% throttle and vacuum boost pressure? Quote Link to comment Share on other sites More sharing options...
richarde7927 Posted July 30, 2012 Author Share Posted July 30, 2012 Ill have a look at the map in the morning and give you all the info i can . Thank you for your help Rich. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 30, 2012 Share Posted July 30, 2012 I have never liked the way the EMU handle's injector lag times, and i think the larger you go the worse the effect, i too have found it necessary to remove a fair bit of fuel from the water temp map to avoid odd starting behavior. Quote Link to comment Share on other sites More sharing options...
Yakky Posted July 30, 2012 Share Posted July 30, 2012 Have you altered the voltage or the control of the voltage to the fuel pump from 9v to 12 during crank? the "12v rewire". Maybe whoever fitted the Walbro has done this because they are rated to run 12v. Quote Link to comment Share on other sites More sharing options...
richarde7927 Posted July 31, 2012 Author Share Posted July 31, 2012 I have not done a 12v rewire i just removed the welbro 255 that the last owner had fitted and replaced it with the 400 welbro pump. Rich. Quote Link to comment Share on other sites More sharing options...
richarde7927 Posted July 31, 2012 Author Share Posted July 31, 2012 Ok i have made no adjustments to the airflow adjust map as i did not think my engine was using a airflow metre i assumed it was running off the greedy map sensor . What do you think the air flow adjust map figures should be ? The water temp adjustment map is set as follows temp -8 0 8 16 24 32 40 48 56 64 72 80 88 96 104 112 adj.val -1.30 -1.20 -0.88 -0.78 -0.64 -0.32 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Rich. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 31, 2012 Share Posted July 31, 2012 You can try taking a little more fuel out up to the temp that the std ECU comes out of cold start, you don't use the airflow adjustment map unless your compensating for injector scaling that way instead of the global setting. Are your injector maps scaled to the std MAP sensor or the Greddy sensor? Quote Link to comment Share on other sites More sharing options...
Guest Diemaxpeter Posted July 31, 2012 Share Posted July 31, 2012 Just a thought, whats your plug gap, we had same on 640bhp dyno run. plugs set to 0.6mm now no trouble. Quote Link to comment Share on other sites More sharing options...
richarde7927 Posted July 31, 2012 Author Share Posted July 31, 2012 Plugs gaps all good its reving right though now once you can get it started .Its just the cold start and startin gup flooding . Rich. Quote Link to comment Share on other sites More sharing options...
Matt H Posted August 1, 2012 Share Posted August 1, 2012 I had a horrible miss on boost a while back. Turned out to be cam sensor. Fixed that and the problem went away. Just an idea as it caused me no end of grief at the time! Quote Link to comment Share on other sites More sharing options...
richarde7927 Posted August 1, 2012 Author Share Posted August 1, 2012 I had a horrible miss on boost a while back. Turned out to be cam sensor. Fixed that and the problem went away. Just an idea as it caused me no end of grief at the time! Thank you for that mate ill have a look into that i need all the help i can get at the minute its really getting me down. Rich. Quote Link to comment Share on other sites More sharing options...
richarde7927 Posted August 4, 2012 Author Share Posted August 4, 2012 Ok the plot thickens . I have unpluged the fuel pump now to save flooding and removed the coil packs and plugs so it can turn over easier and save battery life. I have now be logging each time i turn the car over. As i remove fuel from the cold start the duty input and output go up . As the cold start was set it was around 22 ms on turning it over . So i added fuel to the cold start and it went down to 2.5 ms on crank. Which i do not understand . But the with no changes to the map . I just keep turning it over and logging 5 times in a row and everytime was different on a couple of time the injector duration spiked too a 100 % . Im about ready to take this ecu out and smash it as im almost sure its faulty and the case of all my problems . I really need help people this is doing my head right in and i want my car back on the road . Rich. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.