Turbo woes

[kev kev]

Hey what's up guy listen I am having a issue with my turbo e30
Here is the set up
M20 stock
Arp head studs
Bimmer head turbo cam
Holset turbo
Whodwho megasquirt
Here is the issue every time I do a wot pull the car lean out at about 5000rpm
I try adding fuel with in that rpm did not do anything. These are the things I change
Fuel pump
Fuel filter
Injectors
Fuel pressure regulator (adjustable)
And I can't find Keith aka whodwho please help.

[whodwho]

Sorry still haven't had a chance to look at your files, I will dig them up in the morning. are you sure it isn't running out of injector? Do you know the duty cycle they are reaching? What fuel pressure are you running?

[kev kev]

The fuel pressure at idle is 50psi don't know what it is at 5000rpm
Duty cycle at 5000rpm is 55% I am using decker 60 lbs injector

[redsubdivisions]

Try turning the AFR targets off? Keith has more insight but I had a similar issue where it would break up pretty bad going into boost when I turned that on. Turned it off and she screamed to 7k.

[kev kev]

Ok thanks reds I will try that and report back

[kev kev]

The afr target was already turned off Keith send me a new tune.
Could get the car to run right so I use some of his setting with my old tune.
The car now pulls all the was to 6000rpm where it seem like sine know d if cutting on.
I was going threw the setting I notice Keith AKA whodwo has the coolant cut at 180 degree
To 6000rpm and 200degree to 6000tpm as well. I am gonna change it and see what happen
Any suggestions.

[Golfer_705]

Congrats on your turbo project!

Have you had a chance to confirm your base timing? You should be able to set your timing to fixed in TS and with a timing light at idle confirm that MS is seeing the actual engine advance. If it reads advanced/retarded you will need to adjust your trigger angle* settings.

If your base timing is all good I would preform a tooth log next. If the resistance in the CPS circuit is set too high you will experience sync loss in the higher rpms. It will feel like a rev limiter kicking in and may cause a backfire, TS will generally show a sync loss count when it happens.

You shouldn't need an adjustable FPR with MS since you can adjust your injector PW. A stock FPR should work fine and eliminates another variable. An adjustable regulator would really only be nessasary if you were still using Motronic and couldn't adjust your fuel map, or if your injectors were too small.

If your unsure about reading the tooth logs you could post a screenshot of the log here.

Best of luck with your project!

[kev kev]

ok thanks golfer my base timimg is good.I did not data log this run yet but i will.Now let say
it does loose sync at 6000 rpm,does this mean my cps is bad.

[kev kev]

Hey guys keep hitting some kind of rev cut a 6000rpm
Change the cps still the same thing. Help please

[nomansland92]

What's your ignition setup?

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[kev kev]

Wasted spark


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[nomansland92]

What plugs and what gap? Is it only under full throttle?

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[kev kev]

Turbo woes

Plugs are 7heat range gap 22
No not only under full throttle


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[nomansland92]

So it's not cylinder pressure related, sounds like it's still losing sync. Run the composite loger in tuner studio

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[kev kev]

Ok I will try that
Hey what skip pulse in tuner studio


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