Comptech supercharger.

When tuning with AEM EMS and 650cc injectors. Do you remove the Comptech FPR or can you just leave it there and tune?

Thanks Liem.

 

You won't need a rising rate FPR with 650cc injectors. You may want to add a adjustable regulator to adjust static pressure.

 

The whole idea of bigger injectors and the AEM is to remove the rising rate regulator.

 

Thanks guys.

 

The Comptech and Vortech kits use a high ratio (12:1 in Comptech) rising rate regulator and hide boost fromt he ECU because the ECUs tables for air pressure and fuel just don't go high enough for forced induction. So once th epressure reachs a certain point (about ambient) the increase is hidden and extra fuel is added by upping fuel pressure (rising rate regulator).

When you replace the ECU with an AEM you can read much higher pressures and build the fuel maps to suit them if you have injectors with enough capacity.

We took out the Comptech RRFPR but found that the stock regulator wasn't up to the task with bigger fuel pump and injectors. So we used a Sard unit and then for sh!ts and giggles (actually colour co-ordination) a red AEM unit.

 

What kind of power is the stock regulator capable of? So basically, I have to remove the Comptech FPR and go back to stock FPR? Is it even possible to tune without removing the Comptech FPR?

I'm only looking to get nothing less than 320 rwhp with 7 lbs without aftercooler, AEM EMS and 650cc injectors. I'm going AEM EMS and injectors now so later down the line, tuning and fuel will be up to par.

I will the tuning at Church Automotive, I'm definitely in good hands.

 

Never mind, Church confirmed that tuning can be done with or without the Comptech FPR.

I think I will just leave it as is, with the Comtech FPR.

 

stock fpr will work just fine with your setup and unclutter your engine bay
unless you wind up the boost and have problem with fuel delivery at high rpm, you don't need to change it. The aem fuel pressure regulator is the easiest to fit into the stock fuel rail, when you need it.

Ditch the piggy back FMU. They are so inconsistent (on boost initially) and not as consistent to tune as the 1:1 or 2:1 regulators.

 

I would strongly advise you to remove the Comptech FPR. It provides so much fuel pressure under boost that you will have to drop the duty cycle of 650cc injectors so much you'll just be fighting against yourself. And being a mechanical device it won't always react the same way nor instantly. You'll have all sorts of fluctuation.

There is no point in both a high ratio rising rate regulator (ghetto) and AEM EMS and injectors (proper tuning) fighting each other. I'd say put the OEM regulator back in and see if you can get the fuel pressure you require (I needed adjustability because I was using 440s and the E-manage at the time). If it doesn't do what you need then install the AEM and adjust it.

Fact is, you're using Church. They know what they're doing much better than a bunch of office chair tuners and will steer you right.

 

I'm guessing they will remove the vacuum line from the comptech regulator, and turn it into a fixed rate regulator. There in no need to have 100+psi of pressure with 650cc injectors.