1G 1g Fuel pressure with mods

[Custom GSX]

Hey fellow dsm'ers I have been doing some research on setting my AFPR. Here are my mods Evo 16g, 560cc injectors, MAF Translator, 255lph Wally, FMIC, Aeromotive AFPR. 1990 GSX 5 speed. 19-22psi. So when I had hooked everything up I was told to set it at 43psi, not knowing to remove the vacuum line first. Through reading base pressure should be 37 psi on stock set up.

1. Question. Could Running that pressure damage anything 150mi ?

2. With the mods what would be a good pressure to run for my set up?

Thanks tuners!

 

[turbolover10]

I wouldn't sweat it if anything you where running a little rich.
Base Fuel Pressure for a 1g manual is 37psi "with vacuum disconnected" I would start there, good luck!

 

[Custom GSX]

Ya ill start there at 37 psi but with out being able to monitor it under load, how would I know how much to bump it to for the best efficiency of injector duty cycle, pump capability and boost.

Anybody got anything. Or do I need a way of logging and monitoring to see any benefits of the lower or higher pressures.??????

 

[flawlessTSI]

just set it to stock pressure with the line off at idle and call it a day. it will add more pressure with boost by it self. there is lots of info on here about fuel pressure but with out dsmlink or anything you cant change it with out harming performance.

 

[91stocker]

Anybody got anything. Or do I need a way of logging and monitoring to see any benefits of the lower or higher pressures.??????

The auto's run about 43psi and manuals run 37. So no harm done. The car will run richer then it did before. Dont you have a wideband you can monitor?

Higher fuel pressure allows to effectively get more out of your injectors. If you have a way to tune for it you can run whatever base pressure you want. At some point the injectors will slam shut and refuse to open though. Its also harder on the injectors and will lower its shelf life. Much higher then 43psi of course though.

Injectors are actually given their rating at 43 psi of fuel pressure. But like said above, its better to just leave it stock.

 

[9secSLC]

Too much pressure won't hurt anything besides making your plugs a little black and less power of course without re-tuning it.

 

[habitatguy187]

Too much pressure won't hurt anything besides making your plugs a little black and less power of course without re-tuning it.

Also makes your fuel pump work harder at high boost levels since fuel pressure raises 1:1 with boost pressure. (45psi base pressure + 30psi boost = 75psi fuel pressure) Unless you have the pump/pumpS to supply your injectors at that fuel pressure your tune won't work out right. For most guys 37.5 psi is better and easier on the pump and injectors.

 

[Custom GSX]

Thanks guys, that's what I had read. Just nothing really clarifys the rate of change in fuel psi to make most power. But obviously I need some way of monitoring it besides just a wide band such as DSMLink. So stock psi I will run until DSMLink comes into play. Thanks again.