Do you know what the limitations are, that are caused by the direct injection system? I'm just curious, have been wondering about this ever since direct injection started popping up on the newer cars.

 

Coincidentally, yes it's an 8374 with an internal gate, open scroll T3 housing, unknown octane but not 91 and not leaded fuel. This is on a Mustang dyno in 2WD mode, which has less power loss than 4WD mode.

One limit is that the injectors can not inject during combustion and exhaust strokes, so the injection window is cut in half. Also the high pressure fuel pump needs to produce around 2000 to 3000 psi of fuel pressure which is hard on the pump. It's not easy to find an upgraded HPFP either.

 

Like dave said the injection window is not 720 crank angle, but it isn't 360 either... We can sometimes inject up to 410 degrees. VW/Audi stuff injects between 100bar and 200bar rail pressure. Large injectors are scarce and the ones Bosch will make for you are very expensive. APR makes high pressure fuel pump upgrades (fixed displacement pumps) we increase the piston diameter and use the factory fuel lobe (lift) You can also add more lift or lobes to the cam profile that drives the HPFP. So you have the pump that limits you based on engine speed (since it's driven off the camshaft) and you have an injector limit based on window (crank angle) and engine speed (mS).

 

Headed to the dyno

 

Is the pic working for anyone else?

 

Wrong kind of Evo.

 

Thought process here -

1. Yes, ready for testing!
2. Wait, that radiator is pretty dark
3. Damn it that's a firewall
4. I'll take what I can get lol

 

LOL evo 8/9 pics coming next- evo x kit- here - again



cb

 

Looks tops Chad.

What size?

 

This one is 7163- can also use slightly smaller in the same location-

more pics coming-

cb

 

Has anyone done any comparisons betweens these two turbos yet. Side by side testing for spool boost hp tq etc?

I'm currently running an Airwerks 83/75 and considering the EFR 83/74 or possibly the EFR 76/70.

Just trying to get a few ideas for the next turbo.

 

Any progress for 8/9 testing?

 

Well the airwerks is a big journal bearing turbo with an inconel turbine and the EFR is a ceramic ball bearing turbo with a gamma-ti wheel and probably some turbine aero designed with response in mind....so you can extrapolate that at the least the EFR is going to feel a lot more responsive

 

well i spoke to my friend who shall remain unnamed mentioned the EFR 83/74 spools like a GT30 but pushes too much air causing surging issues in a 2.0 liter. and said the 76/70 would be a better size for the 2.0L. not that the 83/74 won't work but may have issues like that.

 

I am loving the 7163 Open Scroll stuff we are doing-

all of the cars are making 400+whp on our dyno on 93 with bolt ons- (some with stock airboxes and piping)-

we are testing smaller 6758 stuff- which should be interesting (also running two on our GTR)-

cb