Spot The Missing Part
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
I prefer the MAF reading air flow directly as opposed to the SD system where the ECM must read manifold pressure from the MAP and manifold temp from the MAT and then calculate air flow.
However, once a MAF engine is modified to where air flow is beyond the MAF's capacity, i.e. a count of 255, the MAF cannot accurately measure air flow.
You could "convert" from a MAF to a SD system; it would require yoiu to change the sensors, the ECM and the wiring.
However, once a MAF engine is modified to where air flow is beyond the MAF's capacity, i.e. a count of 255, the MAF cannot accurately measure air flow.
You could "convert" from a MAF to a SD system; it would require yoiu to change the sensors, the ECM and the wiring.
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Elite Torch Red Member
Joined: Sep 1999
Posts: 57,805
Likes: 23
From: Exit 89 GSP,Lakewood,NJ The Land Of Mojo
Cental/South NJ Events Coordinator
CI 1-2-3-4-5-6-7-8-9-10-11-12 Vet
CI-II Burnout & Drag Champ
St. Jude Donor '03-'04-'05-'06-'07
Speed Density was from 90-93.
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
maf/MAP
factory speed density is only good for stock motors.
any internal engine changes, and it throws a code.
your entire wiring harness has to switch from 2 connectors to 4 connectors and a new computer.
There's 2 computers, one for a generic like a camaro, or berlinetta or cavalier, and then one for corvettes that's sturdier. you install a custom chip after the install.
The advantage is the maf flows about 670 cfm, and the map system flows what ever the throttle body will flow.
disadvantages are custom chipsets every time you change heads, cam, headers, etc.
The computer has a look-up table that delivers the fuel based on all the sensors, knock, MAT, CTS, mat, MAP, vehicle speed sensor, tach signal,TPS.
The knock sensor is a different P/N also
any internal engine changes, and it throws a code.
your entire wiring harness has to switch from 2 connectors to 4 connectors and a new computer.
There's 2 computers, one for a generic like a camaro, or berlinetta or cavalier, and then one for corvettes that's sturdier. you install a custom chip after the install.
The advantage is the maf flows about 670 cfm, and the map system flows what ever the throttle body will flow.
disadvantages are custom chipsets every time you change heads, cam, headers, etc.
The computer has a look-up table that delivers the fuel based on all the sensors, knock, MAT, CTS, mat, MAP, vehicle speed sensor, tach signal,TPS.
The knock sensor is a different P/N also
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
Originally Posted by kopbet89c4
Nice engine! SD setups are so much cleaner looking than an 80s MAF C4.
There is nothing wrong with this one... and it all works properly too....
Safety Car
Joined: Dec 2004
Posts: 4,088
Likes: 0
From: Poop land
Nice clean RHD engine Case! I like that mirror image look. 
At least its working alright for you. Although harder to tune and play with, I still think SD is still a lot neater though. Would you rather have to replace a $20 MAP sensor or a $500 Mass Air Flow sensor?????
At least its working alright for you. Although harder to tune and play with, I still think SD is still a lot neater though. Would you rather have to replace a $20 MAP sensor or a $500 Mass Air Flow sensor?????
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
Tar mate. I kept it in top working order and reasonably tidy. Ive never had to replace either, and dont wish to replace any of them!!! If you like the right hand drive look, ship your car to me and ill convert it for ya!!! That will save you having to replace your tired old left hand drive steering rack 
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
I still think SD is still a lot neater though. Would you rather have to replace a $20 MAP sensor or a $500 Mass Air Flow sensor?????
RACE ON!!!
Safety Car
Joined: Dec 2004
Posts: 4,088
Likes: 0
From: Poop land
Originally Posted by Casethecorvetteman
I think im going to be needing a bib if im going to drink at the computer while reading the CFI-EFI vs Kopbet89c4 threads
Got scotch running out my nose after that laugh
Got scotch running out my nose after that laugh
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by Casethecorvetteman
And so it begins....
Common sense vs abomination!!!
Common sense vs abomination!!!
I'm gonna lay low here. Most can imagine what I'm thinking and have already beat me to it. I'm preaching to the choir, here.
Originally Posted by Casethecorvetteman
I think im going to be needing a bib if im going to drink at the computer while reading the CFI-EFI vs Kopbet89c4 threads
Got scotch running out my nose after that laugh
Got scotch running out my nose after that laugh
RACE ON!!!