So I was reading a few different guys that were saying during dyno lifting the upper plenum and getting like 330 hp w/o forced induction. So if the mrev2 helps I was wondering if anyone has tried to just pull the lower plenum out altogether. Would that be bad for the engine? Maybe no spacer and factory upper plenum. Would it choke out or what? Does anyone have any ideas? Maybe even an mrev2 with some of the bottom shaved off to help with more air volume?

 

What?

 

yea what?

 

um. what were you reading? links? elaborate clearly on what you mean please.

 

Yes, remove the lower plenum and bolt the upper plenum directly to the heads. Greatly reducing the air volume this way has the same effect as a traditional FI setup. Good find and applied theory!


















I think he is a little confused about the testing that was done when the guys in Canada were making the carbon fiber plenum. They made a hole on the top of the plenum and opened it to atmospheric pressure at certain RPMs as an experiment. This is not something you could do full-time; it was just a snapshot.

 

 

No on one of the G or Z forums I read were this guy had his car on a dyno and during the process he had two guys stand at either fender of the car and had the upper plenum with the bolts just started and the two guys were holding down on the upper plenum, then they started the car had it going and as they were building rpms the two guys would literally lift the upper plenum up and off the lower plenum and they were pulling out about 330 hp. I was just throwing out ideas.

 

^sounds very interesting....any word on what those guys eneded up doing?

 

Not sure. I mean there isn't much you can do. I have been trying to use auto cad to design a lower plenum. I have this idea of something like the MREV2 but then also something like an old carburetor. You know what I mean, if it like the MREV2 but as you got into the higher rpm range the lower longer intake part of the MREV could open up somehow allowing more air as you were digging into the upper rpms and maybe it will give you kick in the rear.

 

So for this to be true:

#1 The unrestricted flow would have to cause the airflow/pressure sensors give readings ridiculously out of expected range, causing the engine computer to default to "fail-safe" fuel maps which go for the safer option of more fuel to prevent a lean condition, dumping fuel at a rate based on engine speed instead of based on sensor readings. This requires a lot of coincidences and dumb luck to be possible just to keep the engine running, let alone at greatly increased power.

#2 It would also mean that the intake design on our cars is absolutely horrible beyond any measure of horribleness.

#3 It would also require that people smart enough to tune an engine and run a dyno shop would risk the engine running lean and destroying itself just to "see what would happen".

#4 The basic FI kits for our cars aren't actually producing any PSI over ambient pressure, merely compensating for poor intake design in the stock intake.

- or -

It's fake.

Occam's razor is pretty clear about what to do with these situations.