Hi All,

I have been looking into getting an exhaust for my 8. I went to Promaz and they claim to have a combined air filter exhaust system that give gains equal to about 20kw. Now i know power gains for the 8 is a hot topic in itself, but in terms of promaz's system has anyone got it and can give me an opinion of whether or not it is worth the money and that the car actually goes faster. Also what sort of air filter is it?

Thanks for any help you can provide.

 

I don't want to start getting people offside here but if you look up the Racing Beat site you will see that their testing shows that the gain to be had by completely removing the muffler entirely was about 4hp. The stock intake for the RX8 is also extremely good.

Each to his own but IMHO 20kw from an intake and exhaust sounds extremely optimistic to me.

 

Perhaps I haven't been looking in the right places, but I haven't seen any properly documented evidence that any of the modifications being offered make any substantive improvements to performance. There have been references to that high precision instrument The Butt Dyno, but IMO there hasn't been anything you could bet the farm on.

If you have another reason for buying an exhaust (looks or sound, maybe), then perhaps you can contact Hymee. His system seems to have touched a popular note.

 

yeah that's what i was thinking. I am an engineer, unfortunately of your piston variety and havent had enough time to study the rotories, but must get onto it. you can get some high gains from exhausts and the like, but it seems like the 8 may be highly tuned like the s2000 so the gains to be had just arent there. I will investigate more into exactly what he does. I know it is a twin system back. It was a quick drop by, so any opinions are welcome. Dont be scared to say it how it is... i certainly wont get offended (I havent spent the money yet )

 

I guess the fact that the car is hard to properly dyn test makes all of these things very, very dodgy at best. It could provide some substantial gains and the only way to measure it may be the butt dyno. Unfortunately when you are in a car with a different exhaust note it may automatically feel faster without actually being faster. I will have to ask for dyn sheets just as a starting point.

 

I tend to believe the Racing Beat claims as they have an ENGINE dyno plus their claims appear to be realistic in the amount of extra power that they are getting.

 

The more extensive researched team has done only 7-8kW in Japan.

If you said a full exhaust plus intake 20kW I might believe but just a catback and intake for 20kW???

Promaz has done work for many many years and i think i should go in and listen to their bull **** one weekend =)

 

I don't really want to get various persons off-side by claiming there claims as BS. I'll let L&L raise the flag for that. What city are you in Black Night? I'm sure you will be able to contact via PM's all those who have had one of mine fitted to get their honest impressions.

I believe we can chassis dyno them properly. Just having an engine dyno doesn't solve the "safe mode" thing - I mean where are the wheel speed sensors getting input from?? Has anyone thought much about that?

The Engine Dyno, however will reduce a number of variables that come into play on a chassis dyno.

I know how to make 20 more HP from a renisis with out changing anything, or fudging the figures on the dyno. Have a read or my most recent posts on the RIC SHAW Piggy back and also Smoothies recent review of it as well at https://www.rx8club.com/showthread.p...hreadid=26089.

I feel I can fairly accurately measure on-road performance with my accelerometer. I have been able to achieve very repeatable results - just ask Smoothy. I'd like to have been able to demo it to Wildcard as well. I believe he can give credible opinions.

No I am confusing myself - as I am replying to 2 threads at once!!

Anyway - best of luck. Hopefully you can benefit from some of the work we have been doing!

Cheers,
Hymee.

 

WOW permission to raise the bullshit blag , by none other than our moderator .

No offence to you DALBKKNIGHT, but i think PROMAZ ARE PISSING IN YOUR POCKET WITH THOSE FIGURES.HA HA HA

cheers
michael

 

I have the promaz system. Simon was indeed helpfull and did an A+ job on the install.

The exhaust and intake itself is real streetable and does not drone, its perfect. As far as performance goes, its got a bit more response down low maybe an extra 5-7Kw, i can spin/chirp the wheels into 3rd gear now so that says something.

K&N air filter.

I'd say its worth the money, even worth the hastle of importing from overseas and installing it myself.

 

Kas,

So how did you measure the 5-7kW?

And that is a LONG way short of the Promaz advert I saw for 19kW??

I dunno about pissing in anyones pocket, but Promaz have advertised in print 19kW. As diplomatically as I can put it "I would tend to dispute that". You can nearly get that much just from getting the car nice and hot on the dyno

Cheers,
Hymee.

 

They can claim what ever they like. With all those problem why don't we sit down and have one car on the dyno in a given day. With all the exhausts we have available and do a dyno day and compare the charts. Test it out like a pro.

THEN... AND ONLY THEN... I will except all the claims. Otherwise... it is all bullshit.

Hymee, please tell me it is not a fair comment

 

Gotta love Racing Beat..........................................

 

Hymee, you have a catback system, is it for power gains or for image (ie. sound)? I'll do a thread search to read up on your system.

I know that Promaz have been doing rotary work for a long time and have a good rep. Their system is a fully redesigned exhaust, but again 19kw seems a high number. Still the system did show improvements from the stock version.

I am very interested in the piggy back. The gains you have seen seem real. How does it affect this new ECU flash I keep reading about everywhere.

Also, at work over here we have heard some claims that Mazda are having some problems with piggybacks and the ECU after a service.

 

I believe Hymee's exhaust saves a bit of weight, adds a few KW's, looks fantastic (I have seen it), sounds ace, and costs bugger all.

The owners of these systems report that the boot (trunk for our U.S readers) floor stays a good bit cooler, too.

A major benefit which I have not seen anyone comment on before, is the change in the look of the car when viewed from the rear. The huge rusty appendage of a muffler disappears when Hymee's system is installed. That muffler is the only ugly part of the car, IMO.

Other aftermarket systems also hide the mufflers, but the damage to the skyrocket is considerably increased.

Gomez.

 

I have a Rotary Extreme Intake and a Hymee Catback exhaust. While I haven't dyno'ed my car with these mods, I would estimate the gain in power at 5-10kW from the timed acceleration runs that I have done. I don't doubt the Promaz system would provide gains, but 20kW seems very optimistic to me.

Wildcard

 

Very optimistic indeed..

These are the sort of gains that you would expect on a turbo not an NA car.

Regards
Phillip

 

It would seem that a general consensus is emerging that around 7-8kW extra is about the best you can do, no matter what mods you bolt on. I thought that Racing Beat was clear in their assessment, and seem to have done their homework.

Whether you subject those potential gains to a cost/benefit analysis, or bolt stuff on because you enjoy playing around with cars and you have the money to indulge this enjoyment is a purely personal thing. I tend to lean to the former point of view, I guess.

My overall assessment is that Mazda have done a remarkable job in getting the most out of the car within commercial constraints. When you look at other aspects of the design, there is a definite philosophy of delivering as much power to the back wheels as possible. For instance, the electric power steering means less engine power wasted in this department. The in-line, carbon fibre tailshaft means more efficient power transmission. The list goes on.

A mischievous thought entered my head. Perhaps Takahashi with his medical knowledge of designing double blind experiments could examine the placebo effect of someone taking his RX-8 to a performance shop. The car would be tinkered with (but nothing actually done) and the person relieved of his cash. He would then be asked about his impression of performance gains. Of course, you need statistically significant numbers of people to undertake this experiment. It would be interesting to compare the subjective impressions of people who had genuine work done and the control or "placebo" group.

 

Ever read "The Rise and Fall of Peter Brock" by Bill Tuckey.....As I recall, Brocky stuck a Polariser under the dash of Larry Perkins' race Commodore and it fell under the brake pedal during testing at Sandown....he was pissed, as it nearly killed him, came roaring into the pits, said a few choice words and turfed it out the door.....

The mighty Polariser, No 1 on the list of Placebo bolt-on's!!!

Gomez.

 

ok if you didnt realise.. promaz claim that they get a 7kw increase with a cat back exhaust. not 20. A 20kw increase is with the Fuel computer too. Read there website correctly.
www.promaz.com.au

I have currently a microtec LT10, K&N RAM pod intake, custom extractors, 3.5inch mid pipe, highflow cat, and magnaflow mufflers all done by PROMAZ and i have well over 20kw. DYNO TUNED 28KW AT THE WHEELS INCREASE.

 

.... then I believe - congrats...

How does it sounds... a lot more?

 

Welcome anthony....sounds like you have a hot modded 8 there

What else have you done to it?