Gabe's fuel and FMU setup
by Akfahad » Tue Apr 13, 2010 9:49 am
Got back from the dyno yesterday after finally getting everything I needed to put the Fuel Management Unit on.
A little history: put the Gen 3 Camry return line fuel system on, but because I had the Supra MAF, my correction values were +50% from around 3800RPM on upward. So I needed something that would increase fuel pressure with boost so I could input smaller correction values on the Neo so I could get some timing back (anything over +30% or so on the SAFC/Neo will pull timing). Hence the reason for the FMU. I bought the full calibration kit from Vortech as Gabe and I were somewhat sure what ratio disk we needed but not 100%. The FMU can use anything from 3:1 on up to 12:1 ratio disks, but the 4:1 disk works perfectly, keeping the fuel pressure around 62psi and a little higher at WOT. The only problem that we realized with the FMU after the tune is that it takes some time for the fuel pressure to build in the lines once at WOT. So my corrections were still around +25% or so towards the lower band on the RPM spectrum and near 0% on the top end to keep a 12:0 A/F. My tuner did say that with a better tuning device where we could control timing and fuel delivery better, 300HP would be almost a sure bet. But with 80* weather and the Neo, she pulled 260HP. I'll post the graph once he emails it to me. She FEELS like a totally different car! Need to track her now and see how she does....
BTW....if you plan on getting Gabe's *new* supercharger, you will have to do the return line fuel system, FMU, and bigger pump (255).
Sorry for the essay
A little history: put the Gen 3 Camry return line fuel system on, but because I had the Supra MAF, my correction values were +50% from around 3800RPM on upward. So I needed something that would increase fuel pressure with boost so I could input smaller correction values on the Neo so I could get some timing back (anything over +30% or so on the SAFC/Neo will pull timing). Hence the reason for the FMU. I bought the full calibration kit from Vortech as Gabe and I were somewhat sure what ratio disk we needed but not 100%. The FMU can use anything from 3:1 on up to 12:1 ratio disks, but the 4:1 disk works perfectly, keeping the fuel pressure around 62psi and a little higher at WOT. The only problem that we realized with the FMU after the tune is that it takes some time for the fuel pressure to build in the lines once at WOT. So my corrections were still around +25% or so towards the lower band on the RPM spectrum and near 0% on the top end to keep a 12:0 A/F. My tuner did say that with a better tuning device where we could control timing and fuel delivery better, 300HP would be almost a sure bet. But with 80* weather and the Neo, she pulled 260HP. I'll post the graph once he emails it to me. She FEELS like a totally different car! Need to track her now and see how she does....
BTW....if you plan on getting Gabe's *new* supercharger, you will have to do the return line fuel system, FMU, and bigger pump (255).
Sorry for the essay
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Akfahad - SolaraGuy Semi-Pro Racer
- Posts: 2738
- Joined: Tue Jan 28, 2003 9:13 am
- Location: NJ
I knew that extra fuel would do the trick.
