650cc install and cant go past 5000rpms!

[GSTdude06]

I just installed my 6500c injectors and I cant free rev past 5000rpms. Im in the middle of tuning my short tirm. Is it cause I havnt tuned my long term tirms? Or whatt could the problem be???

 

[GVR4592]

It's probably from an incomplete tune. What are your safc settings? What is your base fuel presure?

 

[GIZMO]

Does it hit fuel cut or stutter when you try reving. I had something that sounds similar to this but on a stock tune, and if your injectors aren't bad it could have something to do with your fuel pressure, like GVR4592 said. I don't know enough about the tunning to give my thoughts on that side of things.

For me it was a lack of fuel combined with a bad MAS

 

[GSTdude06]

fuel pressure should be at 43 psi with the vacc hose off. it stutters like it is trying to go up there but cant. Im about to go for the long term trim in a little bit so ill post how it goes.

Right now all my low throttal settings are negitive on the SAFC......
But the short tirm is 0.

Good or bad?

 

[GVR4592]

What are the settings? If the high throttle is set at 0 or near 0 it will very very rich.

 

[ChvyKc]

My car did the same thing before I installed the AFC. I just swapped the injectors out and didn't have time to install the AFC so I drove it for three days without it. The amount of fuel going into the motor in the upper RPM's was enough to blow the spark out and make it stutter. It sounds like you have a problem with the tune (like everybody else is saying).

 

[section8]

Mine did the same thing when I installed my 650's. Recheck the injectors and make sure they are sealed properly. Mine weren't and I couldn't get above the same rpm area, it would just stutter and the boost wouldn't engage. My injectors were on good, but the actual rubber seal that goes on before the injectors wasn't sealed and I could smell a little bit of gas from it. I'm not sure about the safc tuen idea. I have dsmlink and it didn't cause my problems. Just another avenue of approach. Hope this helps.

 

[dub2gsx]

When you want to use baseline corrections for fuel injectors. If you have 450's, leave both tables at zero. If you have 550's, put them around -10%. If you have 660's, usually around -18% would be a fine starting point. If you have a hacked MAS, then you will want to use about 5% more than these values.

Check out this article, I live on it!!!:
http://www.dsmtuners.com/forums/showthread.php?t=58403

This will help you a lot!

Brian

 

[GSTdude06]

Right now I can go past 5000rpms but most of my high throttals r negitive 40+....

that good?