Thread: Product review: BPi Flow Stack

That is if turbo show's impressive enough numbers.

If you google for it, you will see that most people get about 5whp, and sometimes up to 10whp if you have a free enough flowing exhaust and depending on other mods...

I also think that it's only fair to dyno the stack with a filter on it if it is a direct comparison between intakes. I don't really like the video they posted on the site. But if you were doing a direct comparison between stacks, then I'd no filters on either one.

I agree, but since I don't have a spare 2.5" filter, just 6" ones, I will do all with no filters. Now final dyno will be with filter, but that will be more for tuning etc.

I must say it will be a bit of an uneven match between the JWT Pop charger and the BPi Flow stack.

The JWT Pop charger designed for the DE maf doesn't like to have any sort of MAF adapters. I tried the AEM one and then this universal one...



As compared to the BPi:


So the BPi will flow better then JWT and probably give a bit more power then the JWT.

I would test this on the DE MAF if I was still using the DE MAF, but I am now using E60 MAF, so my dyno results are mainly going to focus on Turbo with nothing, and then with just the BPi Flow Stack.

If I was a smart feller I would try to determine the surface area to volume differences to maybe show which "stack" has more gain per inch. I dunno, probably not making sense. Pretty much, it would be nice to crunch some numbers and make it a more level playing field.

Still very interested in your dyno numbers.

I got an idea of how to get the JWT dynoed! I will attach it to the DE MAF, then have a 3" to 2.5" pipe going form E60 MAF to DE MAF

EDIT Pictures:

The results are in for this flow stack, and I must say I'm VERY impressed and very disappointed.

Dyno:


Now don't be discouraged by the 2whp gain on the BPi flow stack, as soon as I put the K&N filter on, it got 230whp. The K&N filter probably helped control the air to be more steady when it would be entering the engine.

I was VERY disappointed in JWT one, it did a lot worse then no flow stack at all. I must say that I did have to hook up the JWT Pop Charger with the DE MAF to the E60 MAF. So the JWT pop charger for the E60 MAF might have done a bit better, but why bother when you can get a BPi flow stack for much less and it wont heat soak!!!







A/F Map:


Now the Air to Fuel ratio map looks very interesting for the BPi Flow stack. It was leaner then the others. But this allowed me to richen up my tune and increase timing to yield higher torque numbers.


Now onto getting a BPi Flow stack for my Wife's P11...

Looks like BPi flowstack FTW. Makes sense to me. Look at the pop. The flow hits a wall that takes up approximately 1/2 the surface area, where as the BPi flowstack maintains the same diameter as the coupler/tubing. Plus less heat soak.

It's hard to fault the JWT unit. It's basically the same as the BPi flow stack. It's the DE MAF behind the JWT unit that's killing the power. That DE MAF is a flow disaster.

Yup, this is why I can't just say the JWT is Terrible, thus for this to be MORE accurate it would need to be done on a different JWT POP.

But there has been a few people that said that JWT pop made only 1-2 whp over stock...