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YOUR RESEARCHMAF sensor question
Leading reported evidence
Install before the elective build
Performed · outcome unconfirmed
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Performed · outcome unconfirmed · Original poster
I can definitely say that the IPD plenum was a noticeable change and it was installed before the elective build to 3.8L.
Leading evidence: 'Install before the elective build' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Install before the elective build' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
So I just received and installed the OEM airbox from a 2007 Carrera S 3.8L onto my '99 engine to replace the very early generation "cold air" intake
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Performed · outcome unconfirmed
When Jake rebuilt my 3.4 into a 3.8, I already had the 3.8 box installed with the 3.4 MAF.
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Suggestion · Original poster
in fact the engine is also now a 3.8L, so that maybe changing the MAF models from 3.4L to 3.8L version would be beneficial to the measurement and adjustment of
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Suggestion · Original poster
So I just received and installed the OEM airbox from a 2007 Carrera S 3.8L onto my '99 engine to replace the very early generation "cold air" intake
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Suggestion · Original poster
in fact the engine is also now a 3.8L, so that maybe changing the MAF models from 3.4L to 3.8L version would be beneficial to the measurement and adjustment of
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Generation: 20261026T205155Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
So I just received and installed the OEM airbox from a 2007 Carrera S 3.8L onto my '99 engine to replace the very early generation "cold air" intake
that I had.
Everything that I have read over the years suggests that the "cold air" intakes are not really that good and that the best actual intake for the most flow
of actual cold air is the 3.8L stock box and even Jake Raby seems to agree with that....good enough for me.
So it is a straight forward install, a bit of plastic to remove on the airbox with a Dremel to clear the locking mechanism of the hood and it looks great with the 3.8L written
into the housing which happens to reflect what the engine is now.
So to my MAF question, it hadn't occurred to me until today but my thinking is that the MAF part numbers are different for a 3.4L and the 3.8L.
The intake snorkel, and airbox are so much bigger on this new airbox versus the original 3.4 airbox and
in fact the engine is also now a 3.8L, so that maybe changing the MAF models from 3.4L to 3.8L version would be beneficial to the measurement and adjustment of
the air/fuel mixture.
The 3.4L MAF is 996-606-123-00
The 3.8L MAF is 986-606-125-02
Any technical thoughts from the pro's out there?
When Jake rebuilt my 3.4 into a 3.8, I already had the 3.8 box installed with the 3.4 MAF. He did not change it. He also told me being a MY99, it was not worth spending money on a larger TB or plenum. I doubt it would make any difference.
I can definitely say that the IPD plenum was a noticeable change and it was installed before the elective build to 3.8L.
Jake has mentioned numerous times that he believes in the performance advantage of them as well.
The throttle body was bored out from 74 to 78mm because we aren't given any other choice with the cable throttle as none of the
aftermarket or GT3 throttle bodies with an even larger bore will work.
Did you get the stage 1 or stage 2 on your build and how do you like it!
I find the additional torque a lot of fun to have.
