Need help. (MAF related)
Thread Starter
9 Second Club NA
iTrader: (180)
Joined: Mar 2003
Posts: 5,943
Likes: 1
From: Houston, TX
So I want a factory 02 and up ZO6 MAF which is an 85mm MAF, but I dont want it calibrated for a LS1 F-body? If so, whats the part number and cheapest place to get it?
You want Delphi P/N 25341604. SDPC has it for $135. They list
it as "SENSOR". Big help when you are searching for "MAF".
However SDPC seems not to have the 5-wire to 3-wire harness
(or, their search engine / database is just too lame to turn it up).
Casper's Electronics sells it outright and Pace resells it, you want
CAS108100 which also brings out the in-MAF IAT sensor to a
connector. Or reuse your GMAF adaptor, if you know that's proper.
You can probably do more price-shopping using those P/Ns if you
want. The best price I found is not a sponsor of this 'board.
it as "SENSOR". Big help when you are searching for "MAF".
However SDPC seems not to have the 5-wire to 3-wire harness
(or, their search engine / database is just too lame to turn it up).
Casper's Electronics sells it outright and Pace resells it, you want
CAS108100 which also brings out the in-MAF IAT sensor to a
connector. Or reuse your GMAF adaptor, if you know that's proper.
You can probably do more price-shopping using those P/Ns if you
want. The best price I found is not a sponsor of this 'board.
Thread Starter
9 Second Club NA
iTrader: (180)
Joined: Mar 2003
Posts: 5,943
Likes: 1
From: Houston, TX
The part number you listed, is that the part number for the 02 and up Z06 85mm MAF? Reason I ask is because you mentioned Delphi and that threw me off. What are you talking about when you say 5 wire to 3 wire harness? Im going to sell my Granatelli, so using parts off of it isnt an option. I will be selling it as I bought it. So does this MAF does not bolt right up? What will need to be changed/modified? Lastly, I dont quite understand this statment:
"Casper's Electronics sells it outright and Pace resells it, you want
CAS108100 which also brings out the in-MAF IAT sensor to a
connector."
Thanks.
"Casper's Electronics sells it outright and Pace resells it, you want
CAS108100 which also brings out the in-MAF IAT sensor to a
connector."
Thanks.
The GM part number I gave you is the '02 Z06/LS6 MAF.
The late 'vettes and the truck MAFs have a 5-wire
connector. The F-body MAF uses a 3-wire. The extra
two on the 85mm Delphi are for the IAT. You need to
adapt it up either by getting and soldering on your own
connector, ot use a plug-n-play adapter. The one I use
is that Casper's Electronics one I gave you the number
for. Pace Chevrolet, who also sells a variety of MAFs
(but they charge like $4 more than SDPC), sells the adaptor
but it is made by Casper's and Casper's sells it for a little
less, last I looked.
The MAF is physically larger than the F-body but should be
no problem fitting into whatever plumbing you had the GMAF
bedded into. However if the GMAF came with special hose
bits etc. you will have to come up with those. My SLP MAF
came with a cut-off bit of 3.5" Fernco (so stamped on one
end, the other end was obviously cut with an X-acto knife).
The late 'vettes and the truck MAFs have a 5-wire
connector. The F-body MAF uses a 3-wire. The extra
two on the 85mm Delphi are for the IAT. You need to
adapt it up either by getting and soldering on your own
connector, ot use a plug-n-play adapter. The one I use
is that Casper's Electronics one I gave you the number
for. Pace Chevrolet, who also sells a variety of MAFs
(but they charge like $4 more than SDPC), sells the adaptor
but it is made by Casper's and Casper's sells it for a little
less, last I looked.
The MAF is physically larger than the F-body but should be
no problem fitting into whatever plumbing you had the GMAF
bedded into. However if the GMAF came with special hose
bits etc. you will have to come up with those. My SLP MAF
came with a cut-off bit of 3.5" Fernco (so stamped on one
end, the other end was obviously cut with an X-acto knife).
A stock ported descreened MAF will flow over 900 CFM which exceeds the flow of a SCREENED 85mm MAF. Since you already have the MAF, I would suggest you just have someone tune the car with LS1 Edit.
For those of you that don't want to port your factory MAF (always good idea to keep the stock parts) we sell plastic ported MAF ends that will work with your stock sensor. When tuned with LS1 Edit they will flow as much as 99 % of the motors out there will ever need.
For those of you that don't want to port your factory MAF (always good idea to keep the stock parts) we sell plastic ported MAF ends that will work with your stock sensor. When tuned with LS1 Edit they will flow as much as 99 % of the motors out there will ever need.
Thread Starter
9 Second Club NA
iTrader: (180)
Joined: Mar 2003
Posts: 5,943
Likes: 1
From: Houston, TX
Well I dont have my stock MAF anymore and from what Ive read, there are no calibration tables for the Granatelli and Granatelli will not provide any, so basically its impossible to tune for. So in my case, I need to get a whole new MAF and from what Ive been told, the best way to go is the 02 and up ZO6 MAF which is a descreened 85mm MAF.
I would surely love to see flow/pressure curves
for screened & descreened, 75mm and 85mm MAFs.
Have not, so far. My own measurements are not
able to resolve the drop across an open MAF (not
enough flow on my blowers). But the screen is a
real burden. Comparing screened to descreened
is a big "duh...". The real $135 question is, what
is the pressure drop difference at a more reasonable
700CFM air flow betweeen a descreened 75mm and a
descreened 85mm.
Bueller?
The stock F-body MAF is also within calibration
out to the 12000Hz, 512g/sec limits of the PCM.
The 85mms are up at 12000Hz by 450-460g/sec
of airflow. The Holden table on an F-body will
get the 75mm MAF working out that far. The stock
tables quit early although the MAF doesn't.
However I am nowhere near seeing that kind of
air. I've never seen the high side of 11KHz on
either kind.
Unless you are up for a real tuning challenge you
should not port your MAF or use ported ends.
Unless the place you're buying from can tell you
the proper MAF table, you're in for a fair bit of
trial and error. That's what makes the Delphi MAFs
preferable to the other big-MAF options. I've yet
to see anyone show a proper GMAF or MAF-ends
table. Maybe that's all a trade secret.
for screened & descreened, 75mm and 85mm MAFs.
Have not, so far. My own measurements are not
able to resolve the drop across an open MAF (not
enough flow on my blowers). But the screen is a
real burden. Comparing screened to descreened
is a big "duh...". The real $135 question is, what
is the pressure drop difference at a more reasonable
700CFM air flow betweeen a descreened 75mm and a
descreened 85mm.
Bueller?
The stock F-body MAF is also within calibration
out to the 12000Hz, 512g/sec limits of the PCM.
The 85mms are up at 12000Hz by 450-460g/sec
of airflow. The Holden table on an F-body will
get the 75mm MAF working out that far. The stock
tables quit early although the MAF doesn't.
However I am nowhere near seeing that kind of
air. I've never seen the high side of 11KHz on
either kind.
Unless you are up for a real tuning challenge you
should not port your MAF or use ported ends.
Unless the place you're buying from can tell you
the proper MAF table, you're in for a fair bit of
trial and error. That's what makes the Delphi MAFs
preferable to the other big-MAF options. I've yet
to see anyone show a proper GMAF or MAF-ends
table. Maybe that's all a trade secret.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo If you have LS1 EDIT you can pretty much tune any type of MAF by doing some driving, logging results and then making some changes, driving/logging again. For people that do not have a tuning tool, I agree, stick with the stock MAF or the PCM could give you some wacky results.
I have never pinned my ported 75mm MAF even with a blower running 6 lbs of boost. I think the only people that have done it are running much higher boost levels.
I have never pinned my ported 75mm MAF even with a blower running 6 lbs of boost. I think the only people that have done it are running much higher boost levels.
Thread Starter
9 Second Club NA
iTrader: (180)
Joined: Mar 2003
Posts: 5,943
Likes: 1
From: Houston, TX
I'm not as knowledged about this subject as the 2 of you or anyone else that has replied to this thread, but is the 02 and up the way to go because I certainly dont wanna make the mistake of buying another "bad" part. I just wanna make sure that I get it right the second time around. I had no idea about this until someone suggested I get rid of it when I posted up my mod list. Im ready to purchase a new one, just wanna be 100% sure that its the right one. Thanks.
Thanks. Like I said in the beginning, you do have the option of
just tuning around the GMAF in (though it is going to
take work). Aside from the "mystery calibration" there
is nothing really wrong with it. Did you ever inquire of
the tuner, whether they maybe already had the proper
tune for that piece "in their bag"?
Otherwise, the P/N I told you is a good-to-go, no-screen,
known-calibration piece that anybody can download the
factory table for, off the Internet. I know this because
I have posted it and hosted it. As I'm sure others have too.
Your third option is the stocker. That requires zero tune,
zero adaptation, you can pop the screen or not.
What I can't do, is tell you what -you- really want. Just
the pros, cons, and hows.
just tuning around the GMAF in (though it is going to
take work). Aside from the "mystery calibration" there
is nothing really wrong with it. Did you ever inquire of
the tuner, whether they maybe already had the proper
tune for that piece "in their bag"?
Otherwise, the P/N I told you is a good-to-go, no-screen,
known-calibration piece that anybody can download the
factory table for, off the Internet. I know this because
I have posted it and hosted it. As I'm sure others have too.
Your third option is the stocker. That requires zero tune,
zero adaptation, you can pop the screen or not.
What I can't do, is tell you what -you- really want. Just
the pros, cons, and hows.
Thread Starter
9 Second Club NA
iTrader: (180)
Joined: Mar 2003
Posts: 5,943
Likes: 1
From: Houston, TX
Besides the calibration/tuning part of this, does the 02 and up 85mm ZO6 MAF put out the best performance? Not only do I wanna buy one that has known calibration table and can be properly tuned, but has the best performance as well. Thanks jimmyblue for all your help!
