man the hp is definatly about 100hp off imo, but the torque is probablty just a little low..

 

The HP low because of that HUGE fall off of the torque curve. HP is nothing more then torque times RPM. With a positive displacement blower like that, the torque curve should jump up there like it does in the beginning and pretty much stay flat till the end and then start to fall a bit. Either your having a bad belt slip problem, which should show up as boost dropping, or it's in the tune. Most like, I would say the tune. Something is pulling a BUNCH of timing, possibly Knock Retard especially since your going lean. You need to get someone who knows what there doing with FI tuning to tune it.

 

Well it was tuned with EfiLive data log. There was no belt slippage because the dyno guy was looking at it and I always look at it, always 7psi.

 

I'm thinking the fuel pump is weak and he's running out of fuel. IDC is too high for that setup.

 

The pump is about 4 months old, it came with the kit that I bought brand new. I know they could go bad so I will have to check on that. Also what is IDC?

 

Test the fuel pressure anyways. IDC=Injector Duty Cycle. If your pump isn't producing the volume & pressure that it needs to, the PCM increases the IDC to try to supply enough volume of fuel.

 

Did pick up on the IDC, thanks. I am going to check it tomorrow hopefully and see what it is at. Do you have an idea of what it should be at. Its the pump that MagnaCharger supplys which is a Walbro 255.

 

I show 65 psi at WOT all the way to 6000 rpm. If it's dropping off as rpm increases, you have a problem.

 

His truck is return less and not boost referenced, fuel pressure will fall as rpm goes up and more fuel is used, but shouldn't fall much. Fuel could be a problem, as well as high IAT's pulling timing or a number of other things. A log from the dyno pull would be extremely help full.

 

His truck is return less and not boost referenced, fuel pressure will fall as rpm goes up and more fuel is used, but shouldn't fall much. Fuel could be a problem, as well as high IAT's pulling timing or a number of other things. A log from the dyno pull would be extremely help full.