best double pumper for a evo period.. not even debateable. i cant count how many ****ty double pumpers i replaced with buschurs and it works everytime 100% flawless.

had one in my car now for going on 3 yrs and its rock solid with e85.

 

For those of you interested I did a couple of videos yesterday. One showing the dyno sheets and AFR differences and one with AEM logs showing the difference. They are posted on my Youtube channel or you can go to our Facebook page and click them there.

 

Your car is a beast!

Michael

 

Look forward to the 93 tune.
Could you let me know the IDC when you get done.

 

That has got to be one of the most expensive double pumpers in history, lol...

 

Actually, since Josh is in this thread you can verify with him..... I sold him the AEM AT OUR COST, didn't charge him to install it, didn't charge for any dyno time beyond the first hour ($300), have charged for no trouble shooting either. We also didn't charge to take his POS double pumper out, fix it and re-install it.

Pretty cheap actually.

 

An extremely good deal if you ask me

 

Truth.

Anything Evo related in the future that I do will be with Buschur.

 

You are a cool guy for doing all that.

All I meant was that the initial savings by purchasing a fake instead of a Buschur double pumper, was definitely overshadowed by the labor and parts which were used to fix the problem! If he would have had the Buschur pump assy you would have two days of your life back, and the car might not be on AEM yet, it sounds like... Just pointing out that the bill for the BR double pumper is worth it because IT WORKS!

 

Glad to here this crank is working out Dave... What clutch is in this car?

 

The 6-leg version of the QM twin with the newer "gear drive" hubs.

 

Awesome power and awesome work. I need to head over and check those videos.

 

Did upgrading the pumps setup fix the leanout? You probably wouldn't be surprised, but the stock fuel supply line causes a pretty massive pressure drop. I measured a whopping 16 psi between the pump housing outlet and the fuel rail at 500 whp of E85 flowing through it. Pressure drop goes as the square of the flow rate, so going from 500 whp to 700 whp should increase the pressure drop to 30 psi. Add 40 lbs of boost and 43 psi base pressure, and you've got two fuel pumps fighting against 110 psi of pressure. Not much flow happens at that much back pressure.

I'm sure that the custom fuel line from the double pumper outlet to the stock hardline helps reduce the pressure drop, but I'd still bet there's 20 psi of pressure drop between the pump housing outlet and the fuel rail.

 

Interesting, it's pretty smooth compared to the other Quarter Masters I've driven.

 

Yes, I think I posted it fixed it in here, it's also in the videos. The AFR's went from mid 12's to 10.0:1.