can we put LS1 MAF on LT1?
09-27-2011, 06:19 PM
#1
can we put LS1 MAF on LT1? looking to get a larger diameter MAF to stop the reduction on my air intake.
I have 4" tube from intercoolers necked down to 3.5" for the stock MAF than an elbow to the 4.5" throttle body
are LS1 MAF 4" and can we get them to work with a stock LT1 PCM?
curious.....
I have 4" tube from intercoolers necked down to 3.5" for the stock MAF than an elbow to the 4.5" throttle body
are LS1 MAF 4" and can we get them to work with a stock LT1 PCM?
curious.....
09-27-2011, 07:50 PM
#3
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09-27-2011, 08:08 PM
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There are two LS1 MAF sensors. The early sensor is 3 wire 78mm and the same GM part number as the LT1 MAF. Used through 2002 F-Body.
The late sensor is 2001 and 2002 Corvette 5 wire 85mm (it adds the intake air temp sensor within the housing). Not sure about the diameter of the housing.
The late sensor is 2001 and 2002 Corvette 5 wire 85mm (it adds the intake air temp sensor within the housing). Not sure about the diameter of the housing.
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09-27-2011, 08:22 PM
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You can, but there is a limitation in regards to the frequency output; the LT1 PCM can only read the 85mm MAF to about 2/3rds of it's flow due to the max frequency input into the LT1 PCM. It used to be a good upgrade/replacement if you were fairly stock and just looking for a cheaper replacement (they used to be about 1/3rd the price of the LT1 stock replacements)
09-27-2011, 10:38 PM
#10
You can, but there is a limitation in regards to the frequency output; the LT1 PCM can only read the 85mm MAF to about 2/3rds of it's flow due to the max frequency input into the LT1 PCM. It used to be a good upgrade/replacement if you were fairly stock and just looking for a cheaper replacement (they used to be about 1/3rd the price of the LT1 stock replacements)
I'll keep researching
thanks
09-28-2011, 08:53 AM
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Wouldn't work if you're already maxing out the stocker. the increased flow on the 85mm I'm 99% sure is above the range the LTx PCM can read/understand.
09-28-2011, 09:47 PM
#17
If you are maxxing out a stocker you would just max out the 85mm LS one sooner which is fine if you are comfortable tuning above the maxxed out point.
It would gain you some resolution down below 360gps which is about where the LT pcm can no longer interpret it.
For NA use we don't max out the stocker and Ed Wright has tested it to only be a couple HP restriction on his over 500rwhp mule so it is not worth the hassle of tuning above the max point on the LS sensor but with a boost you max out anyway it might be worth a shot.
It would gain you some resolution down below 360gps which is about where the LT pcm can no longer interpret it.
For NA use we don't max out the stocker and Ed Wright has tested it to only be a couple HP restriction on his over 500rwhp mule so it is not worth the hassle of tuning above the max point on the LS sensor but with a boost you max out anyway it might be worth a shot.
11-26-2012, 03:37 PM
#18
I'm going to bring this back up.
I tuned the car on a dyno, stock LT1 MAF, recalibrated the frequecy tables as high as the PCM would allow.
It now reads max 511.xx AFGS vs 471.xx AFGS with stock freq. tables.
Without telling me to upgrade to 24X or FAST computer, do you think or have seen what a 4" MAF will read compared to the stock 3.5" MAF?
Theory that larger MAF may allow more use of available frequency tables in the PCM, might not max out or not as soon, allowing more MAF tuning.
Anybody tune in a 4" MAF can comment on this theory?
I tuned the car on a dyno, stock LT1 MAF, recalibrated the frequecy tables as high as the PCM would allow.
It now reads max 511.xx AFGS vs 471.xx AFGS with stock freq. tables.
Without telling me to upgrade to 24X or FAST computer, do you think or have seen what a 4" MAF will read compared to the stock 3.5" MAF?
Theory that larger MAF may allow more use of available frequency tables in the PCM, might not max out or not as soon, allowing more MAF tuning.
Anybody tune in a 4" MAF can comment on this theory?
11-26-2012, 03:54 PM
#19
IMO if you go to a larger MAF that can output enough flow within the LT1 pcm's frequency range then you are going to lose resolution down low possibly affecting low speed operation.
Can you tune it speed density for just a few dyno runs and then run it with the MAF in place and then with a 4" piece in place of it? I wouldn't think it should be too bad to get it tuned speed density if you already have it well tuned MAF. Part throttle and such would take more work which is why I am specifying for dyno runs as a test before you keep chasing this.
Can you tune it speed density for just a few dyno runs and then run it with the MAF in place and then with a 4" piece in place of it? I wouldn't think it should be too bad to get it tuned speed density if you already have it well tuned MAF. Part throttle and such would take more work which is why I am specifying for dyno runs as a test before you keep chasing this.
11-26-2012, 05:24 PM
#20
The only thing the larger tube is going to do is lower the HZ reading, not going to do anything for the G/sec limit (511.99). You either have to rape the PE table when you start maxing out the table or scale the tune by percent, or do a SD tune.