typically when goin with a highflow or a straight pipe that has an adjusted or recessed O2 bung the O2 sensor will go much quicker than the OE steup,,, just one of those maintenace things, I ve had my supercat for about 34 months and Im on my 3rd...

 

So just restore the cat?


.................................................. ..........like seriously?

Wow lol I know the cat would die a swift and harsh death but I didn't think it would be that simple.

OK...lets argue a turbocharger on a supercharger's terms. Most people buy the Pettit or Hymee kit for the quality over performance aspect, correct? What does everyone feel is the best turbo kit regarding quality, irregardless of price or performance, on the market right now? This would clear up the debate I think. Compare the highest quality kits from each side and see if the performance outweighs the quality or vice versa.

 

HOLD. UP. Just clicked on Mysql's link below his name for the MM turbo upgrade to see what would happen and its still up on MM's website! I closed that out and went to MM's website all over again and he is still offering his GReddy upgrade kit! But I thought he announced that he wasn't making anymore of those??

"You confused."
"I am a little confused."

 

i guess he didnt bother updating his website?

i think the greddy kit is fine. you can get it for $3400 @ fluidmotorsports, new. if you just want 250whp, its perfect. thats more horsepower than i've ever owned before and i'll be happy to own it when i do. the problem with the greddy kit (that i see) is that people push it to 7,8,9 psi, when it was designed for 6. when i want more horsepower, i'll simply buy another turbo kit. or another car.

250whp(~300hp) in a car that weighs 3000lbs is a great hp/lb ratio.

 

But doesn't it lose a lot of top end power?! I heard it loses breath after 7k...
Also, (I really don't know) isn't the Greddy Kit unreliable, or was it made unrealiable due to the other's who pushed the kit over 6psi?

thankx.

 

the turbo has issues. no argument there.

but for $3400? who is going to argue? fluid motorsports sells a turbo upgrade for $1050.

 

You seem to go with Fluid Motorsports alot don't you? I don't really care, cause honestly he has done nothing wrong to me and is decent.

End of Offtopic Vendor stuff./

But that is pretty damn cheap nonetheless.

 

im all about a good product.

even better if its cheap.

fluidmotorsports is very easy to check prices with because of his website. i dont have to PM him.

and he didnt invent the clutch bracket he sells (mazsport did) but since it is touched by the hand of a rotary deity and it should be on all rx8s i have no problem trying to support him.

and you should buy one. really. you wont regret it. if you do, i will remove the link and message from my signature.

 

If you up the boost past ~6 psi it "loses breath". For example even if you use a boost controller and tweak it to 9 psi, at about 7500 the turbo goes back down to ~6 psi (the factory standard). Not because of the wastegate, but because the turbo is too small to flow that much air. There's no fix except a better turbo.

There are some problems that come with the GReddy kit, regardless of what boost level its at. The wastegate is supposed to cause problems, creating unwanted boost way too early and you really have to eeeease off the line, even when driving normally, or else you'll smoke your tires. The tuning software is horrible from what everyone has said (another $700 for an AP), and journal bearing turbos simply don't last a long time.

$3,500 is dirt cheap but if you think about it, not for what you're getting. There are naturally aspirated RX8's that crank out 200 whp or damn near close, so if you keep it safe at 250 whp for $3,500 you gained 50 whp. For a little over $1,000 you could achieve that goal with a nitrous kit. Not that great of an investment.

 

on the dyno charts, you'll see the drop off after 7500 rpm, but in the car, you don't really notice it - it's still generating more power than stock.

the issue of unwated boost isn't an issue, you just need to do fix #2.

 

for $3,500 you gained 50 whp. For a little over $1,000 you could achieve that goal with a nitrous kit. Not that great of an investment.

The big difference is when you factor in the cost of nitrous refills.....

The Greddy kit, even with all it's flaws, will give a huge boost to the bottom half of the rev range - torque the stock car so sorely misses.

Sure the nitrous and Greddy will give the same 'peak' horsepower figure, but around town the turbo will kick *** all day long - without refills!

 

Ah yes. How could I forget the legendary fix #2

I should dig up that old post and flip through. Maybe a GReddy kit with small upgrades here and there isn't so bad =/

 

Its like $20 a refill though isn't it? You could get 100 refills before you even match the parts for the base GReddy kit alone!

But I see your point though. And lets not forget nitrous kits don't come with BOV's! That extra hiss makes it all worth the extra $2K for parts alone and cracked rotor housing

 

There are a couple of nice looking turbo kits, but the reliability issues come into play because those turbo kits are not able to be tuned by the AccessPORT or similar OEM ECU flash tool and rely on interceptor or piggyback ECUs which are much more unreliable and likely to cause engine damage as well as losing stock like drivability. If the SFR turbo kit is adjusted to be tuned with the AccessPORT and they are able to offer a nice package deal it could be an excellent option as the materials look top notch. They are working towards that right now in the Major HP section, I think WantedTwo's thread has the info.

Otherwise, the only AccessPORT tuned turbo setup is the GReddy kit (which is junk by itself), and some of the available upgrades for it like the MM upgrade. Suffice to say, there would be a market for a competitively priced turbo kit tunable with the AccessPORT around the price point of the Pettit and Hymee systems. Such a kit would have to have a properly sized turbo, and quality components with good customer service and installation availability. Ie. all the same things Pettit offers for it's SC kit. Personally I wish Pettit would just release a turbo kit as well as the SC setup.

 

several things wrong. RARELY does anyone get 200whp on a stock rx8, so thats not a valid argument. the general whp the rx8 has is about 180. so thats a 70whp increase.

so not only do you get 15 more whp, over 55 with nitrous, you get it ALL the time.

and ok, its $20 to fill up a bottle of nitrous. but also factor in the gas and time it took you to get there. personally, i do not want to be running to get my nitrous filled up every week.

and turbos dont blow intake manifolds.

 

Aw you beat me to it? Aren't you forgetting like 85pounds of torque? I wouldve loved to have that much towards the lowend of the car!

 

umm, not meaning to butt in anywhere, but....if you guys take a look at what RX8 hes driving...more specifically this: "2005 Mazda Rx8, Sport ,4 speed auto."

so why's he asking about FI? ..."4 speed auto"...

 

I have to agree unfortunately. If I had the choice, I would have gone for a turbo. More power with more room to grow than nitrous (for the moment). I haven't installed my remote opener yet, so that's another inconvenience. I have to open the bottle before I start driving (or pull over) to use it. Turbo is always there. Plus, it's like 25 minutes away for me to refill the tank. I've had to spend about $50 a tank. I rarely use my nitrous (3 or 4 tanks in 1 year). It's fun, but I never feel like driving out to get the tank refilled when it's empty, and don't always anticipate that I'll feel like having a little fun when I first get in my car. I don't regret it, but I do wish I would have been able to get the turbo instead.

 

Good point. I hope he was leaning more towards a supercharger

 

So the air pump and wastegate problems with the GReddy kit are quick fixes and the tuning problem is more than solved with that $700 gameboy lookin thing. Aside from the turbo over-heating itself and dieing over time are there any other definitive problems with the GReddy? Over time I would upgrade various components (intercooler, maybe the clamps, I hear some people upgrade the wastegate) and obvioiusly a BOV and set of gauges. And eventually upgrade the turbo itself. Whether its the hybrid turbo Bryan@BNR is working on, the rebuild and clipped upgrade by Fluid, or the MM upgrade if its available. Thoughts?

 

MM's upgrade is no longer available, the Fluid upgrade does not address the caking issues resulting from insufficient cooling, so if I where going to upgrade the GReddy turbo now I would investigate the Bryan@BNR option. There are a couple of people who have purchased it so far, but nobody has installed it or tested it yet. Remember also the GReddy kit itself is complete garbage. Even if you get an upgraded turbo your work is not done, there are other things to consider. Besides the manifold and the piping you will need to replace every other piece of the kit. (this is the extra work Worms/RIWWP and myself where discussing) You need to get a new intake as the GReddy one will not work with the AccessPORT (only the AEM one does), replace the couplers with silicone ones etc. You can look at my build thread to get an idea.

 

carbonRX8 has a stock greddy intake and is using the accessport.

 

you can technically use the greddy intake, but it isn't ideal.

when I ran with the greddy intake, it just ran really rich. getting the maf to have proper readings when the sensor is right next to a foam intake filter isn't so hot.

Given a proper intake, you can tune the AFRs to a higher degree of accuracy. Proper afr's are kind of important since your engine depends on it.

 

Hey mysql, you still boosted? I noticed your sig still says "Turbocharged RX8"

I thought you sold your turbo a long time ago?

BTW, what are you replacing your car with? Still for sale right?

 

Already have an AEM intake and was focused on upgrading the cooling aspect of the car (intercooler, radiator, turbo blanket, meth injection, possibly a 3rd oil cooler, etc). Daily driven would the GReddy turbo last about a year if properly tuned and set up (averge driving puts that at about 15,000 miles)?