CraigRX8

Hi guys

Im from the UK. Our cars are slightly different in the fact that they are restricted to 231ps for the hi power model.

Ive a few questions and theres no clear section for me to read so i thought id create one for myself and anyone else seeking these answer.

1. With some of the impressive figures reached with turbo and s/c kits are easy is the car to live with and what has to uprated to cope.

i am aware the renesis has very little moving parts but what kind of pressure and stress can the rotors, gear box, clutch etc take. Obviously prevention is alot better than cure so im keen to learn what exactly should be done.

I bought the 8 with every intention of upgrading power wise when i could. I am told that the car will dyno at about 185 standard. Id be looking to push the 300 mark. But reliabilty is the problem. I also would prefer not to have to resort to an extremely heavy clutch and like to keep major servicing ruffly the same.

2. With such power increase what effects does this have on, 0-60 0-100 and 1/4 miles.

I love straight line speed

N rider89

here is the dyno comparisons if you didnt see them:

https://www.rx8club.com/showthread.php?t=132628

i will let those with turbos/sc's to for some better help

CraigRX8

does no one even know how the 0-60 times vay

mysql

you can estimate using something like this:

http://www.cars-cars-cars.org/0-60-Times-Calculator.htm

The problem is that it all varies. Your mods such as lightweight rims and flywheel play a role. Your car's condition, your shifting ability, etc. too.

SayNoToPistons

iTrader: (8)

We still haven't seen any real 1/4 time sheets.

CraigRX8

Simple answers are the best.

I most likely going to go for the turbo to be honest. Unless the hymee one proves to be excellent.

mysql ive been looking at yoursetup very impressive. What kind of piggy back system are you using?

mysql

adrian-1 had a 13.1 sheet posted on the forum. he dynoed 260ish whp, but had installed the turboxs exhaust after the dyno, but before that run.

mysql

all my dynos and videos show my car running the interceptor-x.

late this week i'll have the cobb accessport running on my car, and likely a new dyno sheet to show.


also, make sure you look at the area under the curve - looking at just peak hp/tq is deceiving.

CraigRX8

ok thanks.

Who on the site is running at 316hp 260 torque upgrade?

mysql

thats jeff. he had a bit longer to tweak his settings than he had with my car, plus i'm using full 2.5" exhaust. so a 3" would help the numbers.

CraigRX8

What pipe is it your have?

Im contacting a local mapping company regarding the different turbos and contacted mazsport also.

Looking over the dyno results the mazsport turbo is running at an extra 4psi than the greddy upgrade.

What would everyone recommended turbo wise?

The Greddy upgrade looks to have a very smooth curve, increasing all the way to 8,200rpm

mysql

b&b catless midpipe is 2.5"

CraigRX8

I see. unfortunately our emissions laws are pretty strick, legally we need to have a cat on the car but between annual inspection testing i keep a midpipe on. Its an agency power one which comes with a 3inch pipe. Then a RB cat back.

Cant wait to hear back from mazsport. Car is pretty much stock, seriously lacking in the performance department next to the scoobies and the supras around here

mysql

I think you did the calculation wrong.

If you have 300 whp, let's figure that's 340 bhp.

Using 3,000 lbs, that's 1,360 kg.

Giving us 4.4 sec 0-60

This doesn't factor in gearing or anything like that.

rotorocks

opps I accidentally deleted my post. but anyway

the formula states time = weight (kg) / bhp * 0.9

1360 / 340 = 4
4 * 0.9 = 3.6

hows it wrong? Are we looking at diff formulas?

rotorocks

i am not saying that it looks right, it sure looks awfully optimistic in my opinion, but like I said: "according to that formula..."

mysql

yeah.

1360
------
340 * 0.9



1360
------
306



4.44

rotorocks

ha ha. my bad... read it wrong.

still ain't bad, though

mysql

if you have 350 whp (380 bhp) it estimates you can hit 4 sec. I'm sure this isn't going to be a perfectly accurate method, but it gives us an idea for people who want a number. It will depend on how fast you shift the 1-2

Rocketman1976

Don't forget to add your body weight into all those equations or at least an average persons weight of 175 lbs, unless you have "Kitt" as your RX-8

CraigRX8

Just been speaking to re:worx a company based in england they said its not problem mapping the kit and it looks to be able to fit RHD. Can anyone fitted the greddy upgrade confirm that it should have no problems with RHD.

Pretty excited now

Also what kind of power can the renesis take and the gearbox take

sosonic

This is the problem with the turbo solutions... being emissions legal. Then there are some other issues, that are going under the radar... However, the emissions issue alone is a big one for many people.

You may need to look at the Supercharger solutions. The Pettit kit is actually very decent when you look at it objectively and in comparison to other kits in terms of psi (which different ranges are showed on the graph) and low end to high end power. It is also maturing, with the ECU reflasher options coming out and greater knowledge base of solutions for issues. Their kit is also backed by a Pro-Tuner, versus being a more "do it yourself" concept.

The much anticipated Hymee SC kit may soon be making it's appearance, so is another contender.

Ultimately, you have to decide what is best for you. Both ways, SC or turbo, will get you to 300WHP (335+ HP at the crank).

The Greddy kit, and so should the better MazdaManic Upgrade of the Greddy kit (I would consider the MM upgrade over just the standard Greddy snail), work with RHD. Re-Amemiya, RX-8 Pro-Tuner, has been installing the kits in JDM (RHD) cars.

MazdaManiac

iTrader: (3)

I'd love to hear what those "under the radar" problems are.
That aside, no power adder is "emissions legal" or even "emissions compliant".
The re-flash engine management solutions allow the end user to completely bypass virtually every emissions compliance test in the country, however.

What graph are you looking at? All the dynos I've seen (as represented in the "dyno comparison thread") pretty clearly show the Pettit getting its *** handed to it.
Once you factor price into it, it isn't even a realistic contender if performance/dollar is your goal.

No, its not "maturing" - other people are spending a great deal of energy fixing it. Pettit has (begrudgingly) offered updated parts to address serious flaws in the system's engineering.

I hope you don't mean Pettit themselves. There is nothing "Pro-Tuner" going on over there. Pettit is a fabricator and a manufacturer of performance parts. They hire out their tuning and, thusfar, all of the major tuning advances for that system have come from third-parties.
It is, IMO, the ultimate "do it yourself" since you clearly need to figure out why it doesn't work correctly on your own.

CraigRX8

What about the hymme kit?

One of the reasons i think im going to go for the mazdamaniac upgrade over the turbo kits from mazsport is because the power curve is so smooth despite it not creating as mch power. Would this be sorted out with different mapping?

sosonic

Yeah, you are here to tell me that the Greddy turbo (with it's amazing long history of problems) and your upgrade turbo kit are problem free. Hahahaha... sorry, I can't be convinced, because I know how "perfect" installs don't go that way.

The ECU flash can be changed back to be emissions legal. Arguably, the turbo kit would have to be took off to be emissions compliant. Even if the turbo could pass emissions, it then leaves the argument of it killing your cat. The supercharger kit can be left on and still make emissions compliance, with less issues.

You can "spin" this, but you know that would just be "spin".

If turbo was "so easy" and "problem free" for the RX-8, Mazdaspeed/Mazda would have done it long ago. Now why was there not a turbo RX-8? It's not like Mazdaspeed can't just slap on a turbo kit? So when you start your spin, please tell us how "safe" turbo is and how the longevity of the engine is/is not effected.

Interestingly the aborted attempt at FI, was with a supercharger. Problem was though, they went with a roots supercharger instead of a twinscrew. Still the fact they went Supercharger, is indicative of several concerns.

Comparing different kits, at different psi is deceptive. The supercharger has done well when compared to other kits, even showing well up against the Mazsport turbo and SFR turbo at lower rpms, and maintains power to the rev limit of the car. Higher psi supercharger kits would only do better.

Yeah, turbo will win the all out HP race, but not everybody is trying to push the car to it's maximum HP limit, which will also require all kinds of upgrades besides FI.

Many people will argue with how "power is delivered", consistency, and stock feel of the car. Again, things that can favor the Supercharger. But also, people will argue the points of install, maintenance, emissions, and longevity of their engine.

You know this. However, you also have the agenda to sell products. Your conclusions, conveniently correspond to your product. This is otherwise known as bias.

Greddy turbo + MazdaManic Upgrade + tuning is NOT cheap.

It is only now with ECU reflashers, that it is starting to become a possibility. Your MazdaManic Upgrade kit will not realize it's full potential until it is a standalone MazdaManic Turbo Kit (which I would like to see, by the way).

Again, these statements are deceptive and unfair on 3 levels:

. 1st, for you giving the appearance that the Pettit Supercharger kit is not improving, when in fact it is.

. 2nd, for giving the impression that Turbo kits don't have problems. It's not like any other Pro-Tuner or Turbo kit is a offering a problem free solution, where the user is not involved in trying to figure out problems.

. 3rd, for not acknowledging you have a competing FI product. Pointing out a rival's problems, mistakes, and missteps is something you can gain from.


I think your products, solutions, and contributions to the RX-8 community are MASSIVE. We all know what you are offering MazdaManic is no joke. We all know your intelligence.

However, there is room enough for people to make choices. You offering competing products and services, and then criticizing a rival looks unfair and bias.