need help tuning

Tuning concepts, methods, tips etc.

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Mk41.8t
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need help tuning

Post by Mk41.8t »

i have a jetta with megasquirt. im learning as i go and have been reading the manual when i have time. i have the car running but is running lean under hard throttle. its a 1.8t with forged internals and a aeb head . I am located in Savannah,GA

i have my current file attached but the log is to big. i can send the file via email
slow_hemi6
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Re: need help tuning

Post by slow_hemi6 »

You could try to zip the log and attach that way.
Find the Manuals up top under Quick links: Manuals. :RTFM:
Cheers Luke
Mk41.8t
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Re: need help tuning

Post by Mk41.8t »

Thanks. i just tried and its still to big to load
turbo conversion
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Re: need help tuning

Post by turbo conversion »

If it is repeatable just make a short log of the problem.

David
1976 Datsun 280Z L28ET Garrett GT35R T3-T04E stage3 50 trim 63 A/R housing custom grind cam 2000-6000 rpm 440cc injectors intercooled 18 lbs. boost
3" exhaust turbo back LC-1 o2 sensor Hallman manual boost controller EDIS 6 ignition batch fire 60mm throttle body 5 spd T5 borg warner 3.54 lsd
billr
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Re: need help tuning

Post by billr »

Your VE values are all pretty low, I'm not surprised that it is lean. How did you come up with that VE table.
lotus23C
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Re: need help tuning

Post by lotus23C »

Yea, my AEB has higher Ve values, quite a bit higher on every area except close to idle, which are similar.
Check out the peak around 93kpa and 2466rpm and it is low all around it. A peak like that can be caused by Autotune if theses cells are the only ones driven thru consistently. Bring surrounding ones up, and maybe these down a bit.
How does it drive when not on WOT?
Currently Lotus 23C replica Audi 1.8T MS 2 v3 Sequential COP and ignition.
Lotus 7 replica 4age 20V blacktop MS2 v3
lotus23C
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Re: need help tuning

Post by lotus23C »

For reference, I have attached my Ve table.
I'm not saying it is perfect and I doubt will work on your engine, but might help you.
Currently Lotus 23C replica Audi 1.8T MS 2 v3 Sequential COP and ignition.
Lotus 7 replica 4age 20V blacktop MS2 v3
turbo conversion
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Re: need help tuning

Post by turbo conversion »

To get more tuning ability (better resolution) you can change your VE table kpa settings.

From 20kpa to 100 kpa make these the first 12 lines and use the upper 4 lines for boost.

This will give you the ability to tune drive ability much easier.

Matt from DIY said this in another post and it works very well.

As he said 4 lines for boost are plenty.

I reset mine and did a little retuning and drive ability is so much smoother.

David
1976 Datsun 280Z L28ET Garrett GT35R T3-T04E stage3 50 trim 63 A/R housing custom grind cam 2000-6000 rpm 440cc injectors intercooled 18 lbs. boost
3" exhaust turbo back LC-1 o2 sensor Hallman manual boost controller EDIS 6 ignition batch fire 60mm throttle body 5 spd T5 borg warner 3.54 lsd
benckj
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Re: need help tuning

Post by benckj »

To get more tuning ability (better resolution) you can change your VE table kpa settings.

From 20kpa to 100 kpa make these the first 12 lines and use the upper 4 lines for boost.
This is a good idea that makes sense. Why not have the greatest resolution in those areas where you drive the most!

jim
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