Running lean under boost

shadow85 · 07-17-2018, 11:13 PM

Quote:

Originally Posted by Spooler

Looks like you don't have enough injector. Most folks get at least IDA 1300cc injectors for
for E85. I am using IDA1700cc for my build. Go through the trouble shooting process and see what happening with the fuel pressure.

My Ecutek log shows my injector duty cycle only reaches 50-60% under load, does that mean I still have a bit of room left in my injectors?

Also interestingly, on another log I took the other night of a semi-pull in 2nd gear, 'Injectory Duty Bank 1' dropped from 50 to almost 0 momentarily. But I think that may be another issue altogether that Seb has said may be a failsafe map dropping the throttle, which he has adjusted and sent another tune through, I have not tested that new tune but will do tonight. See below:

Quote:

Originally Posted by Spooler

Did you get the fuel pressure gauge with the CJ Motorsports fuel system? It shouldn't take but a pull or two on the dyno if you do. Then you will know.

Yes I did the mini pressure gauge. That is why I am taking it for a run on the dyno on Monday to see if it is holding pressure under load.

Quote:

Originally Posted by Jinxx

If you have the return kit you should be able to increase fuel pressure under boost ... if it was tuned correctly and started doing this you may have a vacuum leak on the fuel pressure regulator ... my fuel pressure at idle is 52 but I also have different injectors

Yes I have the return kit. Well I will check the pressure under boost on the dyno, see if it is increasing. It started doing this possibly the moment I got the build done and tried my first WOT pull.

The workshop it was at, said they done a leak test accross the fuel system, tensioned all lines and could not find any faults?

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