E30 S50 Swap - O2 Relay Issue, Diag Port Issue, Breakup Issue

[berlow94]

A good read: http://www.aceperformancesystems.com...able-blending/

[berlow94]

Yeah but the cost of building a high compression S50? You can get a PnP Link ecu with VE fueling for under $2k. It's insurance for all that shiny high compression hardware.


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[vitiokas95]

Get rid of the "war" chip and get a real standalone ECU. You would have been able to identify the problem in under 2 minutes. Why spend all that money on the hardware that goes into a high compression S50 and then run it with BS electronics???

Yeah but cost of standalone....

[berlow94]

Get rid of the "war" chip and get a real standalone ECU. You would have been able to identify the problem in under 2 minutes. Why spend all that money on the hardware that goes into a high compression S50 and then run it with BS electronics???

[vitiokas95]

Update: The 6300-6500rpm problem was a failing VSS in the diff. Got a tune with it deleted, and problem is GONE!

Idle is still a little rough, but not bad, need to put a wideband on it, I suspect its just a little lean.

I know it is old tread, but would you share who sold you tune with VSS delete? I think I have same problem on my race car, I can only rev up to 6200-6400, very rarely over 7k

[dubseven]

Its apart getting boosted right now ;)

[Beej '86 325es]

Idle is still a little rough, but not bad, need to put a wideband on it, I suspect its just a little lean.

any update?

[lolcantturn]

so what happened with the sputtering and loss of power that seemed like the fuel pump dying? It was the VSS?

[dubseven]

Update: The 6300-6500rpm problem was a failing VSS in the diff. Got a tune with it deleted, and problem is GONE!

Idle is still a little rough, but not bad, need to put a wideband on it, I suspect its just a little lean.

[AldcE30]

what connecton harness are you using

[328ijunkie]

yeah check your x20/c101

[brody]

Yah send it over anyway just to make sure.

[dubseven]

Edited my post above. But yes, pretty sure its correct, I will be going back through it tomorrow if I get time. FWIW, car ran just fine for some time before this started happening.

[nrubenstein]

I have constant power, but no switched 12v.

Have you verified that your wiring at the C101/X20 is correct?

[dubseven]

I need to re-check the diag connector. It did have constant 12v, but INPA showed no ignition on (switched 12v), but I dont remember if I checked it with a meter. I tried manually jumpering 12v into pin 16 on the diagnostic port, but INPA still didn't show ignition. Ill check it with a meter tomorrow at the shop.