830 rwhp but loosing boost after 6500 rpm

[tim03cobra]

Just got the car tuned today. We installed a Fore e-85 kit and tuned up the boost. We installed a 4.25" pulley on the F1A blower. There seems to be a problem. It's loosing boost after 6500 rpms and the horsepower is dropping off after 6300rpm. Any ideas? It's a F1A with stage 2 intercooler, 3400 stall stock headers minus the cat and 3" exhaust. No filter on the car for the dyno.

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[15RRGT]

If it's actually losing boost and not just power you could have a big problem brewing.... the psi has to be going somewhere and hopefully not the crankcase. Hopefully it's just belt slip.

 

[Iceman2733]

Any chance are you having belt slip?


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[Grim_Reaper]

Couldn't this just be a simple boost leak? Did you check all intercooler/piping couplers?

 

[tim03cobra]

We checked all of the pipes. We also installed new clamps on the complete system.

Couldn't this just be a simple boost leak? Did you check all intercooler/piping couplers?

 

[tim03cobra]

That's what I was thinking. We put the shortest belt and cranked the tensioner to the max. It only gained 2 lbs of boost from a 4.75" to the 4.25" pulley.

Any chance are you having belt slip?


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[spdbydesign]

Probably belt slip. Car @ Abel?

 

[tim03cobra]

I hope it's a easy fix. I tried to upload the boost graph but, It keeps failing to load.

If it's actually losing boost and not just power you could have a big problem brewing.... the psi has to be going somewhere and hopefully not the crankcase. Hopefully it's just belt slip.

 

[Reds197]

Sounds like belt slip. What does the Maf Lbs/hr reading look like at the 6300 RPM and up?

 

[tim03cobra]

Yes, It's at Abel.

Probably belt slip. Car @ Abel?

 

[tim03cobra]

I'm not sure. I will check on that.

Sounds like belt slip. What does the Maf Lbs/hr reading look like at the 6300 RPM and up?

 

[15RRGT]

I hope it's a easy fix. I tried to upload the boost graph but, It keeps failing to load.

I hope so too! Keep us posted and good luck!

 

[ProChargerTECH]

Make sure she isn't blowing the valves open.... (you upgraded the springs right?)
The boost might be going right out the tail pipe....

I'm not a coyote race guy, but I am sure [MENTION=10926]beefcake[/MENTION] might have info.

 

[beefcake]

could be belt slip, could be like was mentioned, spring pressure, at that power level, springs are a good idea

 

[Higgs Boson]

how many ribs?

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