90mm MAF housing over stock 80mm Z20LET MAF

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Topic: 90mm MAF housing over stock 80mm Z20LET MAF (Read 45831 times)

alexs307

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	Re: 90mm MAF housing over stock 80mm Z20LET MAF « Reply #60 on: January 09, 2013, 12:21:14 PM »

Kelesha, there is a romanian phrase people use:one tiny flower does not bring spring. we are still far behind in means of tuning. even with the gtr and pulsar...those are extremes...but majority suffers from lack of performance parts that usually arrive from Us in min3 weeks, very few tuners know what they are doing in this country, etc.

I am a in happy situation: i have my own dyno, i have tools, i have this opel speedster...but others have to travel hundreds of km to get to a dyno, for example...

Anyway, good to know that help is available if this project does not come to an end.


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alexs307

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	Re: 90mm MAF housing over stock 80mm Z20LET MAF « Reply #61 on: January 28, 2013, 02:01:47 AM »

News update:

- MAF issues are solved: seems the thing that caused the engine to stop at idle once the MAF was plugged was the fact that because of too little space in engine bay, the MAF was located very close to the turbo, so the turbulence caused at idle by the turbo spinning at low revs was messing up MAF readings; it may sound easy now, but it took me a while to figure it out
- I moved MAF 1m away from the turbo, everything is fine
- I calibrated injectors after the 80mm LEH MAF installed, when everything was fine, I went for calibrating the MAF for larger housing, and here everything went fine also
- I stopped the dyno adjustment session because valve seals started to leak again, and I got a decent power figure of 425hp at 1.5bar boost, 11.4-11.8 AFR
- total adjustments took 500km on dyno and 104runs, but I am happy with the results. Boost control must be improved, it's not 100% precise, but this I will take care of once I get back to adjustments after fixing mechanical problems.

Engine will be taken apart for replacing all gaskets and seals, I also ordered ACL race bearings ( main + rod ), so I guess next adjustments will be made after driving 1000km break-in distance.

Thanks for help.


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Rabbid

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	Re: 90mm MAF housing over stock 80mm Z20LET MAF « Reply #62 on: January 28, 2013, 04:09:04 AM »

Well done sir Grin

Which MAF curve did you use for the 90mm in the end? Theres several I've come across and depending which one you choose will either cause the car to use the right or wrong load values in other tables.

What was the top value in MLHFM you used?

Obviously any can be made to work by scaling the injectors.


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alexs307

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	Re: 90mm MAF housing over stock 80mm Z20LET MAF « Reply #63 on: February 02, 2013, 08:47:49 AM »

1600kgh top value in MLHFM.


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