And that inherently will introduce problems with an unreferenced regulator in boost. PCM thinks fuel pressure differential is static, yet 6 psi of boost yields 6psi lower differential fuel pressure than a N/A vehicle. On a set of Mototron 60s (63.2# at 43.5psi, 72.3# at 58psi), the PCM will think you're flowing 72.3# (0kPa MANVAC), when in reality, at 6psi of boost, they flow 68.5# or so, yielding lower than needed pulse widths and a leaner mixture...Originally Posted by joecar
dc justin
What would you do in my situation? What would you suggest?
Thanks
-Jet
1 7/8" American Racing Headers, 3" X pipe, 6" GHL Bullits ~ DONE, AEM Wideband~DONE, MTI R1 Cam~DONE, Mototron 60's~DONE, D1SC Stage II procharger~DONE, Alky Control Methanol Spray System~To do
2-bar from the get go. You can account for the changes in fuel pressure differential very easily. Your VE table won't technically be correct (but nothing can be in this case), but your end-result fueling will be.
THANKS!
Would this be the correct 2 bar?
GM 12569241 (AC-Delco #213-1520)
Last edited by JET LEE; March 20th, 2007 at 04:41 AM.
1 7/8" American Racing Headers, 3" X pipe, 6" GHL Bullits ~ DONE, AEM Wideband~DONE, MTI R1 Cam~DONE, Mototron 60's~DONE, D1SC Stage II procharger~DONE, Alky Control Methanol Spray System~To do
I think the correct one is 12580698, or some combination of those numbers.
Is it more troublesome to redesign the fuel system with a vacuum/boost referenced fuel pressure regulator? I would think a few companies out there (someone like Racetronix) would have thought about an easy to install system so we wouldn't have these problems. Then, we could set the IRF accordingly (flat) and have accurate values with the right fueling system.
Last edited by SSpdDmon; March 20th, 2007 at 07:26 AM.
That would be definitely be ideal.
Thanks for all the help guys.
So:
1. Get a 2 bar MAP sensor
2. Reflash with COS5
3. Set IFR for 60 lb mototrons (60@43.5psi w/ rail press @58 psi)
4. Bump up MainVE by ~15%
5. AutotuneVE
Do I need to do anything other than listed in the Autotune tutorial to get it running good and dependable?
Thanks again for everyone's help, you guys are a wealth of information!
1 7/8" American Racing Headers, 3" X pipe, 6" GHL Bullits ~ DONE, AEM Wideband~DONE, MTI R1 Cam~DONE, Mototron 60's~DONE, D1SC Stage II procharger~DONE, Alky Control Methanol Spray System~To do
3. 60Lb Mototrons are actually 63.2# at 43.5psi (http://www.racetronix.com/L107.html look at the static flow rate section)
4. Also fill out the boost VE table (instructions are in the COS doc).
6. Disable MAF sensor.
Thanks DC Justin,
I'll track down a 2 bar map and try my hand at tuning.
1 7/8" American Racing Headers, 3" X pipe, 6" GHL Bullits ~ DONE, AEM Wideband~DONE, MTI R1 Cam~DONE, Mototron 60's~DONE, D1SC Stage II procharger~DONE, Alky Control Methanol Spray System~To do
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