Elite 2000 - Suddenly gone lean

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duz10s+gtr
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Joined: Mon Oct 16, 2017 8:19 am

Elite 2000 - Suddenly gone lean

Postby duz10s+gtr » Mon Oct 16, 2017 8:30 am

Hi All,

After some opinions.

R32 GTR with Haltech Elite 2000, runs nearly every sensor apart from EGT's and flex fuel.

Recently had an issue, car was tuned in Sydney but resides in Melbourne, about 4 weeks after getting it back it started getting hesitating etc on light cruise and take-off anywhere around the 1500-4000rpm area, once out this range and under decent load would clear up and come good, it slowly got worse to the point it wouldn't drive.

Anyway tuner logged in remotely and did some adjustments and logging, for some reason car had gone seriously lean in the 1500-4000rpm zone, up top under good load it was normal, had to add some large numbers in the fuel map to get it to clear up in the low rpm zone and we are lost as to why. On boost in higher rpm no problems at all and no adjustments needed.

Fuel pressure is fine ( runs mechanical pump ), O2 working fine, no vac leaks, temp is good, fuel is fresh ( runs pump E85 ), sparks plugs are new

Any ideas on what it could be, block injectors? fuel filter needs cleaning ? fuel reg?

Thanks

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HaltechMatthew
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Re: Elite 2000 - Suddenly gone lean

Postby HaltechMatthew » Mon Oct 16, 2017 10:35 am

It could be anything.

You would see this is they tuned it over MAP with the factory ITBs, rather then correctly mapping it over TPS.

duz10s+gtr
Posts: 2
Joined: Mon Oct 16, 2017 8:19 am

Re: Elite 2000 - Suddenly gone lean

Postby duz10s+gtr » Mon Oct 16, 2017 10:55 am

HaltechMatthew wrote:It could be anything.

You would see this is they tuned it over MAP with the factory ITBs, rather then correctly mapping it over TPS.


Hi Matthew thanks for reply

Car no longer runs ITB's , now large single TB with TPS

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Mattias
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Re: Elite 2000 - Suddenly gone lean

Postby Mattias » Mon Oct 16, 2017 9:21 pm

Check your LTFT map if you have that active. LTFT has caused these kind of problems for me sometimes.

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HaltechMatthew
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Re: Elite 2000 - Suddenly gone lean

Postby HaltechMatthew » Tue Oct 17, 2017 1:00 pm

Long Term only does what Short term is doing, there is no secret magic to it. If STFT is positive it will learn positive, if STFT is negative it will learn negative. LTFT does not look at the AFR in any way.

The only issues we come across are when you try to run too high a gain and turn your Long Term into a second type of Short Term. :wink:

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Mattias
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Re: Elite 2000 - Suddenly gone lean

Postby Mattias » Tue Oct 17, 2017 5:39 pm

Yes, I don't think there is anything wrong with the function. But it seems easy to fall in a pit before the tune is done for all conditions and all settings are correct for the setup. I've managed to mess it up quite a bit while trying to get a feel for the function and its limits :lol:


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