slash128's Top Mount Build
#2226
n3rd
Thread Starter
The analysis continues I keep comparing to past logs and I came across a very close match.... 1psi difference and it every so slightly shows in the power graph, but otherwise a near perfect match!
Red line: current (stock) MAF in 85mm housing, stock MAF scale, 13psi
Blue line: previous Amazon MAF in 83mm honeycomb housing, modified MAF scale in idle and cruise regions, 12psi
Red line: current (stock) MAF in 85mm housing, stock MAF scale, 13psi
Blue line: previous Amazon MAF in 83mm honeycomb housing, modified MAF scale in idle and cruise regions, 12psi
Last edited by slash128; 10-20-2016 at 04:46 PM.
#2228
Hybrid Greddy Boosted
There's a subtle trend in the above graph that leaner AFRs appear to give comparatively better power. I've noticed while tuning my car that the difference in power between AFR of 10.5 (and below) and 12 is quite noticeable. Perhaps this accounts for a small part of the variation you're seeing.
Perhaps your old MAF had more internal resistance? You could do the resistor mod to get more head room. The main thing is that your AFRs are looking safe, and you've got enough headroom for more airflow.
Perhaps your old MAF had more internal resistance? You could do the resistor mod to get more head room. The main thing is that your AFRs are looking safe, and you've got enough headroom for more airflow.
#2230
n3rd
Thread Starter
There's a subtle trend in the above graph that leaner AFRs appear to give comparatively better power. I've noticed while tuning my car that the difference in power between AFR of 10.5 (and below) and 12 is quite noticeable. Perhaps this accounts for a small part of the variation you're seeing.
Perhaps your old MAF had more internal resistance? You could do the resistor mod to get more head room. The main thing is that your AFRs are looking safe, and you've got enough headroom for more airflow.
Perhaps your old MAF had more internal resistance? You could do the resistor mod to get more head room. The main thing is that your AFRs are looking safe, and you've got enough headroom for more airflow.
The gain in power from 10's to low 12's AFR is precisely why I was having so much fun with running E50! I was working my way towards best torque AFR and it was paying off, but sadly the only local station that carried it decided to discontinue it earlier this year and never brought it back. The only reason I run as rich as I do on 92 octane is to counter knock. Our 10.0:1 compression engines are great for NA power but become severely knock limited under high boost...
#2233
n3rd
Thread Starter
It's good to be back I no longer have any doubts about my rebuild!
FWIW, this is with the stock MAF sensor in the 85mm housing, no honeycomb, just a single screen. In the 83mm honeycomb MAF housing with a single screen this sensor was hitting 4.94V @ 12psi. In the 85mm housing it only hit 4.89V @ 14psi... Amazing what a difference 2mm diameter makes...!
FWIW, this is with the stock MAF sensor in the 85mm housing, no honeycomb, just a single screen. In the 83mm honeycomb MAF housing with a single screen this sensor was hitting 4.94V @ 12psi. In the 85mm housing it only hit 4.89V @ 14psi... Amazing what a difference 2mm diameter makes...!
Last edited by slash128; 10-21-2016 at 07:13 PM.
#2245
n3rd
Thread Starter
#2247
n3rd
Thread Starter
Yep, the GoodBox and Paimon's work is what inspired me. I have no grand plans to produce anything, or even if I will be successful with what I'm after, just a personal pet project...