is harlan going to make twin maf box?
The Bull
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From: Grand Rapids, MI
Harlan is out of town with GM doing some testing at the moment. His connection is pretty limited at the moment as they travel to glorious destinations like Death Valley this week. Take this back to the top towards the weekend and hopefully he'll pick up on it.
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I'm pretty sure 
another company is working on a box like this also but, I haven't checked with them in a month or so. I'll contact them and get back to this thread with some info. 
another company is working on a box like this also but, I haven't checked with them in a month or so. I'll contact them and get back to this thread with some info. Honestly, I am not too sure what the point would be. Even if you ran two maf's and summed them you would be limited to the 512 grams per second PCM limit. So what if the box would average the two maf flows (basically cut your air flow in half), then feed it to the PCM. Now, you have to go into your PCM and halve every table that references the MAF table, which is most of them. It can be done, but I guess I would ask why. Your timing tables would lose a ton of resolution too - you could only change timing every 800 rpms.
There is no silver bullet to get around the 512 limit. That's all I am saying. Now if LS1Edit or someone came out with a version that automatically did all the conversions to go along with, say, a pro-m MAF, then you would have something good. Otherwise, you are going to be in a world of pain getting it tuned.
Just my 2c.
-Geoff
There is no silver bullet to get around the 512 limit. That's all I am saying. Now if LS1Edit or someone came out with a version that automatically did all the conversions to go along with, say, a pro-m MAF, then you would have something good. Otherwise, you are going to be in a world of pain getting it tuned.
Just my 2c.
-Geoff
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Originally Posted by White_Hawk
Honestly, I am not too sure what the point would be. Even if you ran two maf's and summed them you would be limited to the 512 grams per second PCM limit. So what if the box would average the two maf flows (basically cut your air flow in half), then feed it to the PCM. Now, you have to go into your PCM and halve every table that references the MAF table, which is most of them. It can be done, but I guess I would ask why. Your timing tables would lose a ton of resolution too - you could only change timing every 800 rpms.
There is no silver bullet to get around the 512 limit. That's all I am saying. Now if LS1Edit or someone came out with a version that automatically did all the conversions to go along with, say, a pro-m MAF, then you would have something good. Otherwise, you are going to be in a world of pain getting it tuned.
Just my 2c.
-Geoff
There is no silver bullet to get around the 512 limit. That's all I am saying. Now if LS1Edit or someone came out with a version that automatically did all the conversions to go along with, say, a pro-m MAF, then you would have something good. Otherwise, you are going to be in a world of pain getting it tuned.
Just my 2c.
-Geoff
that it's just a matter of dividing the VE table and injector slope by 2 for a twin maf setup. I'll probably hear something back on the prototype tomorrow sometime if it's still being made at all.
Last edited by XLR8NSS; Jul 19, 2004 at 06:04 PM.
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Originally Posted by XLR8NSS
I've heard from a VERY reliable source that it's just a matter of dividing the VE table and injector slope by 2 for a twin maf setup.
that it's just a matter of dividing the VE table and injector slope by 2 for a twin maf setup. And don't forget to rescale all your timing tables too (referenced in grams per second).
-Geoff
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Originally Posted by White_Hawk
If that's all you are going to do, you can go get a pro-m maf right now and do it. What is the advantage of having dual MAF's? There is only one throttle body on the car.
And don't forget to rescale all your timing tables too (referenced in grams per second).
-Geoff
And don't forget to rescale all your timing tables too (referenced in grams per second).
-Geoff
The ProM setup is easier but, I bet twin MAFs would look cooler.
As far as part throttle driveability I have no clue. Since only one person has ran both of these setups maybe he could chime in.
Originally Posted by 69firebird
I think that the twin mafs would be on the non-pressure side, they wouldnt see boost, so the 512 really wouldnt come into play I wouldnt think
thanks
ed
thanks
ed
If you are just trying to extend the MAF range by faking out the PCM, you can do that today with a pro-m maf or even a maf translater will work (I think they go up to 25%).
-Geoff
The Bull
Joined: Jun 2002
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From: Grand Rapids, MI
Harlan's twin MAF's are on the pressure side. It really wasn't that complicated for him to do, like XLR8NSS said. He has some cool ideas on how you overcome the limitations of the MAF as well. I'm sure he'll be able to chime in when he can.
There are many ways to do it, the problem with the twin MAF's is you're cutting the "fineness" of the tables in half. It's been tried, driveability suffered noticeably. If I ever get around to it I'm going to offer up a system that gets around it with a single MAF, but like everybody else I have no time.
Good question, I'll let you know after the tranny is in and I can see it on a dyno (or street) for myself.
Originally Posted by Bryan Wilkinson
Does it see boost in the computer after 511 G/ps.
Originally Posted by Jammer
Good question, I'll let you know after the tranny is in and I can see it on a dyno (or street) for myself.
Im learning...thank you for the "starting point" in this arena!
Im sure it doesnt help much but this is the Z06 maf.
Im sure it doesnt help much but this is the Z06 maf.
Originally Posted by Bryan Wilkinson
My MAF starts to clip at 4200 RPM because the computer has reached its maximum adjustablity. I made my numbers in the signature with the stock MAF, and stock computer. If you go to www.perigee.net/~lunapark/dynograph.html, you can see what happens to the A/F when it maxed out the MAF. The correction of the A/F after 4200 is where the tuner started adding and removing fuel to match what the wideband was saying.