I had the same question about the blower whine. It seems that most people want their car to be loud and obnoxious, but as far as I'm concerned, the more 'sleeper' it can be, the better. The video posted on the BRP forums sounds pretty loud, but I think the camera's microphone just picks up the blower whine quite a bit. An acquaintance who has driven a BRP-equipped Miata said it wasn't too bad, but who knows..

I don't mind some whine when driving it hard, but for driving around town, it would be nice if it kept mostly quiet.

 

Thanks for the updated graphs slim "face punch" jim.

The blower is pretty quite when you are just doing normal driving. Most exhausts (at least in my experience with the Miatas) have been louder than the blower, even the quietest ones. You shouldn't really hear it until you get a heavy right foot.

 

More eye-candy. I have corrected for crank horsepower (assuming 18% driveline loss) and assumed a 3000 pound car (one 200lb driver or two supermodels ).

The error propogation at this point has to be pretty large. Just throwing that out there. Anyone taking these results as set in stone is making a number of very large assumptions.

But we can most certainly get a rough idea...and it's pretty fun to look at if I may say so myself.

Weight to power ratios can give you a good idea of how hard a car is going to "pull". Assuming one car doesnt have a huge advantage in gearing of course...

For giggles (200lb driver):

~ From Supercars.net ~

Integra GS-R: 17.65
RX-8: 13.56
Mustang GT: 12.33
Nismo 350Z: 11.52
Evo IX: 12.19
NSX-R: 10.86
M3: 10.6
Porsche 911S: 9.38
Corvette: 8.43
Ford GT:6.72
Z06: 6.66
Carrera GT: 5.29

 

Wow. I just noticed that a BRP equiped S2000 should be able to keep up with an Integra GS-R.......if you short shift at 4000 RPM

 

I had a Jackson Racing SC on my Miata and during cruise you wouldn't have known the blower was even there unless I told you, unlike a Comptech kit I've heard on an S that made a whistling sound like a loose power steering belt at idle and everywhere in between. Aside from the dual pillar guage pods with my A/F ratio guage lit up like a Christmas tree, the car was a sleeper. It was only running high 14's anyway, so I couldn't have cared less about it being sleeper and I couldn't care less about the S being a sleeper either. Around here, if you don't have an SUV or a pickup truck, you stand out like a sore thumb anyway. I think I'm 1 of 2 or 3 in this town of 45-50k people with an S2000. Do you think I care about having a sleeper? I'm driving the S around in the snow and at times, -30 degree F temps. This car really doesn't fit in here. Getting back to the subject of sound, once you open the throttle, you'll start to hear it and at WOT, it's quite prominant (sounds kinda like a jet engine spoiling up). I wouldn't worry about it being obnoxious though. It's not like the F20/22 is a quiet motor at 8-9k RPM anyway. It's not easy making even a stock S2000 a sleeper.

Another thing to keep in mind is that the latest graph from BR isn't the final product and there was still more A/F ratio tuning to be done.

 

Yes, the MP62 flows enough air for maybe 400hp at the crank, so figure probably 350rwhp or so.

 

I would disagree with that statement.

They did test the blower at 8psi with the wrong IC. Even though they did not state it I think that they did test with the proper IC for 8psi.


The reason that they have pulled back on the boost is to keep the longevity/reliability of the engine up.

They did state that 8psi ran fine it was just getting to close to the detonation point for comfort. Now with that said that was only with there ELF, stock ECU, stock injectors, and stock fuel pump 06 so no fuel pressure regulator.

Now I think with an aftermarket ECU or sister card and other supporting upgrades(fuel pump, injectors, fuel regulator, ect..) it would be possible to run 8psi maybe more off of the BRP MP62 safely on a S2k.

 

Well, as I said, the MP62 can only flow enough air for maybe 400hp, so figure about 340-360 at the wheels...max. At that point, the blower is spinning awfully fast, and it's beating up and heating the air pretty good.

So, yes, the BRP kit is not maxxed out at this point, but it's only about 50hp away from it. The reason they decided upon the 6.5psi instead of 8psi probably has as much to do with intake charge temps. as running out of fuel with the stock injectors and Elf.

I'm sure with a standalone, you'd get that extra 25-50hp, but that'd be about it.

 

Since we just had a nice discussion in another thread about the importance of torque, I've made another comparison graph. This one is similar to the last in that I have adjusted for 18% driveline loss (so that you can make some comparisons to other cars and their published crank values if you wish). The weight includes a 200 pound driver. Or four monkeys at the controls.

I figured all the guys with gears would want to know how their cars are going to stack up to forced induction, so I've included 4.44, 4.57 and 4.77 effective torque multiplication graphs. Awesome

These curves are directly related to the amount of force pushing you into your seat.

 

do you mind inclue 4.44 gears?