Originally Posted by
Bagato We have one of those stock MAF working as blow thru, on my friends car, with the SAFC on zero (not doing anything) AFR's were at 10:1 on WOT, after working a lil bit on the SAFC we got the AFR's to like high 11's/flat 12's. The car pulls strong as hell now.
So I guess without tuning, the stock MAF indeed makes the AFR's go rich as hell. If you have a stock MAF, an ECU that you cant tune, you should reconsider going from draw thru to blow thru.
I agree with this statement. Last year i was running a de with a bb t25, 370's, nismo fpr, walbro, bb ecu and a de maf in blow through, I had no afc and i had the fpr set a 3bar. The problem i was having was the car always ran rich under boost low 10's if not lower than that even at stock boost. I turned the boost up to try and lean it out a bit but it would still run the same mostly because the nismo regulator was doing its job and bringing in more fuel pressure as boost was rising. I have an aem wideband in the car, i have also verified the same readings with a inovate lm1.
I would say if you are running a de or like maf and dont have a way of tuning use it in draw through configuration, as you will most likely run a bit leaner and make more power. I should have been running this way because the blue birds were set up to run like this from the factory.
If you are running an n60, z32, q45 etc and have a way of tuning i would recommend running in blow through.
I have had 4-5 different turbo/ maf set ups on my nx and an n60 in blow through was my favorite, it seemed to have the best driveability and ran great. The only problem i had was maxing out the maf.
1 was a t25/28 jwt ecu bored maf draw through tmic, then i added an safc and upped the boost, next was a gt2871 with a bb det ecu/hks fcon with a water to air i/c, next was a gt2871 with a stock usdm ecu/emanage with a q45 maf draw through same i/c,
Next was the same but a larger trim gt2871r with a 10:1 engine with a stock ecu/emanage. then i went blow through with an n60 with the same set up. And last was a bb set up in blow through configuration.
The set up i am currently working on will be a 9:1 built de, with a jwt ecu 72lb z32 program with either an emanage or an safc to tune, and an undisclosed turbo this will be set up with a blow through maf. The goal of this set up is ultimate drivability and instant boost response with 300+whp on pump gas 93 oct.