What can I replace my maf with?
Thread Starter
Drifting
Joined: Apr 2009
Posts: 1,898
Likes: 9
From: Morrisville PA
What can I replace my maf with?
Hi, I am going to SD tune for my new fast 90/90 combo through a vararam and the powerduct. I don't mind just leaving the maf in place and turning it off, as I don't think it will hurt flow at all. However, since I am getting SD tuned, I want to switch to a fast acting IAT sensor. The problem is the powerduct doesn't have the provision, so I would have to drill it, which I would prefer not to. I would rather drill into whatever I replace the maf with so A) I don't ruin the powerduct and B) it is as close to the TB as possible which will be most accurate for tuning.
Any ideas? I was thinking PVC pipe but home depot only has sizes up to 2" diameter.
Any ideas? I was thinking PVC pipe but home depot only has sizes up to 2" diameter.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
MY experience as a tuner----Leave the MAF alone and run the MAF tune-
A stock 99 MAF table goes up to 11250 HZ--this is easily enough to run apprx 425-450 RWHP !!! The newer MAF's go up to 12500 and can handle to around 450-475 RWHP---So in my opinion no need to run a SD tune -The reason some use a SD tune is because their HP expectations take them beyond the MAF scale---This typically takes larger cubic inches--- a turbo or a supercharger--- As far as HP gains running a SD tune when not really needed ?? My opinion none--or very little---And you have no corrections to AFR in closed loop or P/T driving-as it runs 100% off the VE table---To run SD correctly you must do HOURS and HOURS of data logging to hit all the cells--Then as you change altitudes or air desnity gos up or down due to outsdte temperatures--by rights you should adjust your VE table at every major air density change---Also with a SD tune things like idle hunting--surging--dying show up if the VE table isn't 100% correct---
If this is a 100% dedicated race car yes you may gain a few ponies with a SD tune--But a few HP is not gonna do much for you--
PS: The IAT sensor and location is a NON ISSUE-- as your tuner should "tune it out" or desensitise all the false IAT knock retard anyway--
If driveabilty is more of a concern your MAF is the best bet--take a look at my profile and mods --apprx 400 RWHP with the STOCK MAF and MAF tune---\
AS for your 90/90 combo-- you are making 2 MAJOR mods--this is NOT a typical bolt on--tuning is deff called for--Again data logging with a wideband for hours and hours are the only way to get it correct--
With a MAF tune it will be much easier and faster to tune
A stock 99 MAF table goes up to 11250 HZ--this is easily enough to run apprx 425-450 RWHP !!! The newer MAF's go up to 12500 and can handle to around 450-475 RWHP---So in my opinion no need to run a SD tune -The reason some use a SD tune is because their HP expectations take them beyond the MAF scale---This typically takes larger cubic inches--- a turbo or a supercharger--- As far as HP gains running a SD tune when not really needed ?? My opinion none--or very little---And you have no corrections to AFR in closed loop or P/T driving-as it runs 100% off the VE table---To run SD correctly you must do HOURS and HOURS of data logging to hit all the cells--Then as you change altitudes or air desnity gos up or down due to outsdte temperatures--by rights you should adjust your VE table at every major air density change---Also with a SD tune things like idle hunting--surging--dying show up if the VE table isn't 100% correct---
If this is a 100% dedicated race car yes you may gain a few ponies with a SD tune--But a few HP is not gonna do much for you--
PS: The IAT sensor and location is a NON ISSUE-- as your tuner should "tune it out" or desensitise all the false IAT knock retard anyway--
If driveabilty is more of a concern your MAF is the best bet--take a look at my profile and mods --apprx 400 RWHP with the STOCK MAF and MAF tune---\
AS for your 90/90 combo-- you are making 2 MAJOR mods--this is NOT a typical bolt on--tuning is deff called for--Again data logging with a wideband for hours and hours are the only way to get it correct--
With a MAF tune it will be much easier and faster to tune
Last edited by tblu92; Oct 25, 2011 at 12:35 PM.
Thread Starter
Drifting
Joined: Apr 2009
Posts: 1,898
Likes: 9
From: Morrisville PA
MY experience as a tuner----Leave the MAF alone and run the MAF tune-
A stock 99 MAF table goes up to 11250 HZ--this is easily enough to run apprx 425-450 RWHP !!! The newer MAF's go up to 12500 and can handle to around 450-475 RWHP---So in my opinion no need to run a SD tune -The reason some use a SD tune is because their HP expectations take them beyond the MAF scale---This typically takes larger cubic inches--- a turbo or a supercharger--- As far as HP gains running a SD tune when not really needed ?? My opinion none--or very little---And you have no corrections to AFR in closed loop or P/T driving-as it runs 100% off the VE table---To run SD correctly you must do HOURS and HOURS of data logging to hit all the cells--Then as you change altitudes or air desnity gos up or down due to outsdte temperatures--by rights you should adjust your VE table at every major air density change---Also with a SD tune things like idle hunting--surging--dying show up if the VE table isn't 100% correct---
If this is a 100% dedicated race car yes you may gain a few ponies with a SD tune--But a few HP is not gonna do much for you--
PS: The IAT sensor and location is a NON ISSUE-- as your tuner should "tune it out" or desensitise all the false IAT knock retard anyway--
If driveabilty is more of a concern your MAF is the best bet--take a look at my profile and mods --apprx 400 RWHP with the STOCK MAF and MAF tune---\
AS for your 90/90 combo-- you are making 2 MAJOR mods--this is NOT a typical bolt on--tuning is deff called for--Again data logging with a wideband for hours and hours are the only way to get it correct--
With a MAF tune it will be much easier and faster to tune
A stock 99 MAF table goes up to 11250 HZ--this is easily enough to run apprx 425-450 RWHP !!! The newer MAF's go up to 12500 and can handle to around 450-475 RWHP---So in my opinion no need to run a SD tune -The reason some use a SD tune is because their HP expectations take them beyond the MAF scale---This typically takes larger cubic inches--- a turbo or a supercharger--- As far as HP gains running a SD tune when not really needed ?? My opinion none--or very little---And you have no corrections to AFR in closed loop or P/T driving-as it runs 100% off the VE table---To run SD correctly you must do HOURS and HOURS of data logging to hit all the cells--Then as you change altitudes or air desnity gos up or down due to outsdte temperatures--by rights you should adjust your VE table at every major air density change---Also with a SD tune things like idle hunting--surging--dying show up if the VE table isn't 100% correct---
If this is a 100% dedicated race car yes you may gain a few ponies with a SD tune--But a few HP is not gonna do much for you--
PS: The IAT sensor and location is a NON ISSUE-- as your tuner should "tune it out" or desensitise all the false IAT knock retard anyway--
If driveabilty is more of a concern your MAF is the best bet--take a look at my profile and mods --apprx 400 RWHP with the STOCK MAF and MAF tune---\
AS for your 90/90 combo-- you are making 2 MAJOR mods--this is NOT a typical bolt on--tuning is deff called for--Again data logging with a wideband for hours and hours are the only way to get it correct--
With a MAF tune it will be much easier and faster to tune
I was leaning towards the maf. The only reason I wanted to go SD was because I can't think of a good way to hook up the fresh air PCV line AFTER the maf. You see, the powerduct puts the maf right next to the throttle body, so there is little to not room to try to get a fitting between. If I can find a way, I will definitely do the maf tune. Otherwise, I was going to use my AIR tube fitting that is capped off for the fresh air line. But that is unmetered air, so I would assume that would screw up the maf tune? Or would it not matter and can be tuned around?
My car made 436 sae corrected through the stock maf, tb, and ls6 intake manifold. I expect it to at least hit 450, if not 460 with the FAST setup. Will the maf be ok in this case?
Last edited by mchicia1; Oct 25, 2011 at 12:55 PM.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
Depends on whether or not you have smog police in your area---But an easy fix would be to VENT the PCV to atmosphere with a universal breather--Mine is plumbed that way-Then you don't have to worry about the routing onto the intake tube---
And yes--whatever you decide-- metered -- unmetered or vented to atmosphere-your tuner will make adjustments to your MAF table to correct your trims---
And yes--whatever you decide-- metered -- unmetered or vented to atmosphere-your tuner will make adjustments to your MAF table to correct your trims---
