There is definitely too much variation in those maf values, something is wrong.

Unfortunately it could be in your datalogging setup though, sometimes you can get bad values mixed in with good values.

This can happen if you are trying to log too many params, so try logging just 2 params, ie RPM and MAF count and see what it looks like.

If the MAF value really were flying around that much I would think it would be running poorly, how is it running?

 

i'll try that out. i'm wondering if its due to logging only PID's (lowecase values) rather than the uppercase EPID's as the EPID's are the direct memory values from the ECU.

car runs great. aside from it being a bit lean above 3k if i really step on it, as its not tuned all the way. its pulls nicely. idle feels solid as well.

 

Crap, so you are saying that the brand new SCT X4 won't datalog the EPID's?

I was hoping with this new version that SCT finally got datalogging working better on our vintage cars, I never was able to get a X3 to datalog reliably on my 02 and it was a known problem that the X3 doesn't log well on 02's and similar years.

The values on the PID's should still be correct though, try the logging test I mentioned with just 1 or 2 PID's. Since the car is running well its probably a logging problem.

 

Lol yea man X4 has a problem with EPIDs. SCT knows about it too. The new Livewire has the same issues too, from what 02sonic has seen.

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Well, that sucks!

 

its the bov. i didn't actually loosen it last night, i didn't realize there was a set nut as well as a screw that needed to be moved. anyway; i loosened it a lot and logged a few things. rev logs and drive logs. i also did just rpm/maf counts logs but they were the same as normal logs i do.

anyway; neutral rev logs showed the maf counts as jumpy still however; the drive log showed the maf counts to be a lot smoother. wtf? how and why?

 

If you key on but do not start the car do the maf values initialize at min readings and hold? You can try pulling the maf pipe off and using a blow dryer to blow consistent air through it and see what the readings are, then pull the maf from the pipe and blow air over just the maf as an attempt to see if turbulance is an issue the way you have it mounted.

 

I hope you guys put some pressure on SCT to make the logging work better on our cars.

It is possible to log the EPID's on our cars, the BE/Mongoose based system I use does that really well.

 

The greddy knockoffs use a single spring that you adjust with a nut on the top. I had a greddy type S on my eclipse.

If you use a vacuum pump you can measure how much vacuum it takes to open the valve. A simple test that will answer if it is set right.


Good catch on the maf counts swinging. I tried looking at the logs from my iphone and did not see it. Trending in excel helps that stuff pop out.

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Tial Q 50mm ordered!! thanks JPC Racing.

 

No Problem Buddy!!!!

Email me your log file. I'd like to take a look at it a little more in depth.

 

The log now or after the Tial?

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The log now

 

It's attached to the first post. I have a rev log and drive log.

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a bit confused on how the maf's should look via the graph and numerically. Joe @ Tricktuners is telling me the maf counts are jumpy but idk how they should look. i know they should look smooth or rather smooth at idle but idk about increasing the rpm's. mind you i am logging maf counts rather than MAF AD COUNTS b/c the SCT X4 has issues logging uppercase EPID's. over the weekend i moved the MAF from where it was originally located to a new spot as i and others figured it was a turbulence problem. here are my findings w/ pics and datalogs attached. original MAF location and datalog pic from 040514: new MAF location and datalog pic from 040614: values look very similar. not sure what the next move should be to get these values smoother. sigh, battling this injector/fuel rail issue and maf sucks!!

What MAF sensor/setup are you using? 90mm sct or just a lightning MAF ?