Turbo RX8
05-07-2006, 08:11 PM
#2
Junior Member
Join Date: May 2006
Posts: 11
Greddy has a nice turbo that comes with all upgrades you need for about 3k. It will add 60whp (wheel not measured at engine, rx8 has about 200whp stock).
However, if you can wait I am getting the pettit racing twin-screw supercharger. It also gives 60whp (that includes power loss to run supercharger, so it is a little more psi than greddy). So, it has same power as Greddy but comes on much faster and stays high in psi in high RPM when turbo goes down. The product is from what I hear finished, but pettit hasn't quite started selling them yet.
If you want more power there is a kit that gives 80 more whp but it costs $7,000 so I won't even bother mentioning the company name. Since the supercharger comes on earlier and does better in high RPM, it might be faster anyways.
However, if you can wait I am getting the pettit racing twin-screw supercharger. It also gives 60whp (that includes power loss to run supercharger, so it is a little more psi than greddy). So, it has same power as Greddy but comes on much faster and stays high in psi in high RPM when turbo goes down. The product is from what I hear finished, but pettit hasn't quite started selling them yet.
If you want more power there is a kit that gives 80 more whp but it costs $7,000 so I won't even bother mentioning the company name. Since the supercharger comes on earlier and does better in high RPM, it might be faster anyways.
05-08-2006, 01:56 PM
#3
Junior Member
Join Date: May 2006
Posts: 11
Originally Posted by blue_mazdaspeed_rx8' post='817875' date='May 7 2006, 09:11 PM
If you want more power there is a kit that gives 80 more whp but it costs $7,000
I meant more 80whp than stock, not turbos/superchargers. If it were 80 more than them then 140whp more than stock would be a great deal. Sorry if I confused anyone.
05-08-2006, 07:32 PM
#4
Senior Member
Join Date: Aug 2005
Location: Freeport FL
Posts: 381
Good luck without a bunch of cash, the Greddy kit is a pile of dog poo IMO.
I have been talking with 1revvin7 and figuring out best way to go about this but he should be working on a engin dynod turbo setup. Exspect around 400whp and over capable.
I have been talking with 1revvin7 and figuring out best way to go about this but he should be working on a engin dynod turbo setup. Exspect around 400whp and over capable.
05-17-2006, 12:00 PM
#7
Senior Member
Join Date: May 2005
Posts: 959
The boosted Rx8 idea worries me. Unlike a conventional 13B under boost, if the renesis detonates and attempts to chuck the apex seal out the exhaust... where will it go? It doesn't have side exahust ports like the normal 13B, instead...the seal will get stuck and bounce around in the motor for a few seconds, then grind away at those expensive housings. Just my thoughts... I still like the rx8 and want one, but I dunno if I'd boost it. If I did, it would be low, 5 -7psi max...
05-18-2006, 03:33 AM
#8
Member
Join Date: May 2004
Posts: 36
Precisely the reason why the Renesis is more resilliant to detonation. The seals can't be blown out the periph ports, so they don't deform under light detonation. Now, you can blow the MSP up, but it is no longer the case that one good ping will spew a seal like the REW.
05-18-2006, 09:45 PM
#9
Senior Member
Join Date: May 2005
Posts: 959
Its always good if a seal stays where it's put...and even better that the renesis can take a few pings more than the REW..but lets face it, most the rx8 guys out there wanting to boost their cars and are NOT rotary mechanics and they WILL blow the motor after numerous pings, etc.
Seriously, out of all the Rx8 owners i've run into and actually talked to, only two of them had previously owned an rx7, neither of which modified their cars, but are planning to mod the rx8,lol...
the rx8 in capable hands would be a terrific car, but otherwise...
Seriously, out of all the Rx8 owners i've run into and actually talked to, only two of them had previously owned an rx7, neither of which modified their cars, but are planning to mod the rx8,lol...
the rx8 in capable hands would be a terrific car, but otherwise...
05-20-2006, 06:15 PM
#10
Junior Member
Join Date: May 2006
Posts: 11
Originally Posted by MazdaManiac' post='819852' date='May 18 2006, 04:33 AM
BS and BS. If power came on any faster than it does in the Greddy kit, the car would be undrivable. As it comes from Greddy, the gas pedal becomes an on/off switch for full boost.
Furthermore, the boost drop-off problem with the kit is not the turbo - its the WG actuator which can't hold the flap under full exhaust pressure.
The Greddy kit is FAR from perfect, but it comes with almost all of the things you need to make it perfect. Just add talent.
The pettit supercharger definitly comes on before an unmodified Greddy turbo. In fact, it is on in idle (not full boost of course).
Also, I have never heard of people saying its not the turbo size that makes it lose power in high RPM. Experts who have been working on getting more power from it (over 350 whp) say it still goes down in high RPM. People have put larger turbos on the rx8 and keep power in high RPM. Unless the turbo had its own gears, it can't keep power in high RPM.