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Tuning With Bigger Injectors

Crans

By Crans,
in Engines & Forced Induction

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Crans Mentor

Crans

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After greatly annoying my neighbours for the last 2 hours(Gotta love a 3.5" exhaust with only a 4.5" cannon) i think i got a good compromise between idle and cruise.

Towards the end my battery voltage dropped from around 13.8 to 13??? must need some better earthing as i have already replace the altinator(Hes me hoping i dont need to do that again)

The voltage drop caused it to run alittle leaner(I think) around 15.2 and the odd stall pulling up after a short drive(Car always had this problem, could be no BOV??)

On boost she sat at around 11.2 which is better than the reported RICH from the techedge 2J1

So i think im getting somewhere finally, now for the big test driving to work YAY!!

  • 2 weeks later...
Crans Mentor

Crans

Posted
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Ok so pretty sure i have an electrical problem. The longer the car runs the worse it gets. Had to drive from Mindarie back to work in West Perth today and about 10km's from the city it started leaning out to 18-19afr on cruise, had been running pretty much stoich on cruise for most of the way. Had to drop her back a gear and keep the throttle on a bit more to get her back to work at a more reasonable 15.5-16afr.

Drive it home 3 hours later and it was fine most ofthe way untill again it started leaning out.

A new Deatschwerks 300LPH fuel pump has been installed so i doubt its a fuel pressure problem.

Also after running for a while it starts missing alot at low rpm. It's bad enough to make it look like i can drive a manual when in first gear unless i floor it, it will lurch forward in time with the missing

Im thinking a number of things could cause this.

Stuffed CAS

General wiring/altinator problem(Voltage drops the longer you drive it)

Coil packs are packing it in(Dosnt explain the lean out, would appear to richen up if anything)

Any combo of the three above

Any input would be appriciated.

rob82 Mentor

rob82

Posted
Posted

Using NB sim from my techedge wideband. Using an rb20 ecu so i dont think there is any learning going on

I can tell you that there will definately be AF trims learning on your car. You cannot tune a factory ECU without reading fuel trim data!! Fullstop..

rob82 Mentor

rob82

Posted
Posted

How can the ecu learn if memory is cleared when the car is turned off? Pretty sure the rb20 ecu does not have any battery backed/NV RAM

Can %100 garuntee that there is af learning from CA18 onwards. If you have a factory manual goto pg EN-267.

You need to see this data to understand whats going on. Havn't used nistune - but surely it willgive you AF trim data.

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