Re: [DML] No power at 4000 RPM

[dherv10@xxxx]

Scott, See below.
John Hervey

<< Recently I posted a message asking for ideas on what could be causing
the drop in power at full throttle once the engine started going past
4000 rpm.

I installed a gauge to measure fuel system pressures.

All reading were taken on a cold engine, 70 F ambient temperature. ( what 
are your raedings hot.)

Control Pressure = 2 bar
Primary Pressure = 4.9 bar
Rest Pressure = 2.9 bar
Rest Pressure after 10 minutes = 2.5 bar

Looking at my chart, it looks like primary pressure is at the bottom end
of the allowable checking pressure 4.9 to 5.5 bar.
I can set the primary pressure to the setting range of 5.1 to 5.3 bar.

My question is;

Will raising the primary pressure affect the Control Pressure? ( Yes ).

Is there a way to adjust the Control Pressure?( Yes, But by the experts. )

How is it done? >> ( Take the fuel dist off and send it to me. )

The fuel pump doesn't create the pressure, all it does is pump volume of gas. 
The restrictions create the pressure. The primary pressure can only be 
adjusted by a shim in the unit. ( Picture on my web site.) When it's right ( 
Yes ) it also creates a back pressure ( trying to keep the gas from going 
back to the tank) which will raise or lower the control pressure which in 
turn will allow the control plunger to up or down sending gas to the 
injectors. Speaking of injectors, Have they been cleaned or replaced. You may 
be starving the car gas at high RPM because the injectors are partially 
stopped up. 
John Hervey
www.specialTauto.com