Astral

I can attest to that... it was also shrill, as shrill as it sounds in the online video (granted, that's with the hood opened).

Daemos

That's sad...

I had a procharger C-1 on my sentra at 4,5psi I made 240whp and 220ft-lb of torque from 2000rpm-6200 (redline) that was on a mustang dyno, that reads ~10-15% lower than other mustang dynos. So easily 260whp-270whpish on a dynojet.

It also contained many more pieces, and came with EVERYTHING, and was 5K USD.

I'm not sure what's driving the price much higher than that.

Yes prochargers amplify the stock curve, but also gives you much more top end, but it's gradual, it's a very linear powerband, and VERY nice.

tajabaho1

I see, the higher price would probably be that this car is very new and everyone's jacking up the price on it

Daemos

I'm not sure how much the powermod costs, but the cost of fabbing a bracket, buying the procharger at cost, and getting all your IC piping done (including intercooler), injectors, spark plugs, filter, belts, a recirc-bov, lines, wiring, walbro fuel pump, would be no more than ~$3200 USD (even that might be a little high, but the most expensive part should be the procharger which is $2000USD at cost, well something like $1950 USD.

swiftrx8

Yeah, I was thinking the same thing, there must be a hell of a mark-up on this kit. I think the powermod is only $600-700, not sure, but I thought I saw it somewhere for that price.

Red Devil

You could put on a much smaller pulley and bascially overboost the system...but once you hit that peak X pressure ratio, you'd have to put in a pop off valve to vent the excess...kind of complicated, imo.

swiftrx8

Also looking through some dyno's of stock/minor bolt ons the RX8 seems to make about 120-125whp @ 5K rpms, the Procharged @ 10psi is making about 145whp. So it appears that you do get a small improvement under the peak area.

Astral

Keep in mind that those dynos are DynoDynamics dynos, which read low (notice stock 8's dynoing in at ~160whp)

swiftrx8

Yeah that's a strange power curve for a stock RX8, guess we will see a better objective dyno when someone installs the kit. I don't doubt the 303WHP @ 10psi.

rotarygod

That won't work. First off consider the internal gearing in the supercharger. You have to spin it a whole lot faster to get appreciable boost down low. This would mean you overspin it up top. If you set it up so you reach the superchargers max rated speed at engien redline and bleed off boost if it's too high, you've got another problem. Heat. It doesn't matter if you bleed off pressure or not. You had to compress the air in the firstplace which heats it up. You may get rid of excess pressure but you won't get rid of the heat.

mac11

iTrader: (1)

Its not ideal by any means but I've seen it done on other motors. A wastegate was used instead of a pop off valve though.

dynamho

That makes sense, regarding the excess speed.

It momentarily escaped me at the time of postulation that with turbos you can control the incoming exhaust to limit the speed (boost). That's not the case with a belt driven impeller. I was concerned more about incoming charge air to the engine and less about the turbine's max rated speed.

Then it sounds like the centrifugal supercharger can benefit from variable vanes for our application huh?

Thanks for the explanation.

Daemos

Actually I think the stock power band is perfect, and something that only enhances it further would be a benefit.

As a previous pro charger owner, I can attest without a doubt that the first thing you will notice when putting it on is the throttle response is a little slower due to the extra pully/gears you need to turn. But honestly once you are moving, and you romp on the gas, it's completely different, you don't' really care, once you are in boost it's fast.

Personally I think it's pointless to have 6.5 psi of boost on a procharger over 9000 rpm range, as it'll do 6.5 at 9000 and 0 at 0 and it's a linear curve, I would expect at least 10-12 psi for 'good' performance to fatten up the power band. Yes I know what I'm saying is simplistic, sorry.

mac11

iTrader: (1)

Vortech blowers are not linear.

MazdaManiac

iTrader: (3)

Centrifugal superchargers are exponential.
Technically, so are turbos, but since their drive speed is tied to load and not RPM, they end up behaving in a linear fashion.

r0tor

iTrader: (1)

centrifugal superchargers have always been ridiculed (i'm not a gigantic fan of them either)... but the fact of the matter is if you keep the revs up (and all of us have no problem with that when we are trying to have fun), they can add a whole lot of bang for your buck and are great for drag racing since you get awesome top end and still be able to launch the car easily

mac11

iTrader: (1)

centrifugal blowers are great for high displacement motors that already make a good amount of torque down low in N/A form. That should be self evident.

Daemos

Exactly

Here is a dyno for my old car @ 4.5 psi on a Pro charger PSC-1

Red Devil

Yes, it will work. The idea is to overspin it up top, but if you have sized the SC appropriately to handle the excess boost, and maybe even stay within good efficiency than that's not an issue. I've seen it in person on a Mustang a few years back. Naturally you are generating more heat because you're compressing more air - so get a larger intercooler, and play with the engine's timing.

I'm not claiming by any means that I'd do it, or even that I like the idea. Simply that I've seen it performed effectively. Using the pop off valve basically as a wastegate seemed way too risky to me.

The_Don

I joined so i can post on this and another thread about this SC kit and FI in general on the renesis.

You guys with all your collective knowledge, just keep going in circles.

There is a reason no other Jap tune house has not released a serious turbo kit, appart from the "excuse for a turbo kit" GReddy makes.

BECAUSE IT IS INEFICIENT WITH THE RENESIS ENGINE. MAZDA engineers said it them selves, turbos are a waste of time. They engineered the damn thing, im sure they know.

How many turbo chargerd 600HP renesis engined RX8's are there out there > 0
geeeeee i wonder why ?

There are many Series 6 13B conversions in RX8 pumping big power. Yes also the nutters that some how managed to shoe horn a 20B in one.

I'm blown away that intelligent people can't see that the ProCharged kit is the best on the market. It's the only one that keeps making power to 9,000 RPM. And is reliable. And if you think it's too expensive, then just buy your self a cat back system that does nothing for your power out put, BUT is sure sounds COOL.

Nitrous is easiest.

The whole business of i want more torque down low, buy a GTO. 5.7 liters should make you happy. Man the thing I love about the renesis is the fact that it revs to 9,000. And the powerband is 5-9k, what other car on the planet has a powerband of 4000RPM, NONE that i know of.

I know i'm going to rub some people up the wrong way, but that is life. Don't be too hard on me.

Red Devil

Thanks for the education professor. Everything you wrote that I kept above is wrong or inaccurate.

The_Don

Please correct me.

Also would love you too show me a 600HP turbo Renesis engine. Id consider changing my current RX8 setup if i can make 600Hp all day.

Red Devil

No need to. The information to explain why your thoughts are inaccurate, or misguided, are everywhere on this forum.

And 600hp "all day" in a 2 rotor...right. I've seen 600+hp two rotors, there is nothing "all day" about them.

mysql101

Yes, actually he is right, you're basically wrong on all counts. Rather than trying to reexplain it, you should do some reading up.

mac11

iTrader: (1)

Please show me a 600hp Procharged Renesis.

I would also like to see a turbo charged car that makes less than stock power anywhere in the power band on any amount of boost.