Turbo RX8's?

RX8Dude · 11-10-2007, 01:48 PM

You guys seen this, or know much about turbos on these things? how good are they? reliable? ( I have my doubts )

But I would love one, listen to how mean this sounds!

onebadapple · 11-10-2007, 03:07 PM

I don't know much about that, but I wouldn't say no, that's for sure!

Paton · 11-12-2007, 09:52 AM

That just sounds dangerous! I love it.

Alain · 11-17-2007, 02:46 PM

WOW I'll have to admit that is too much for me. I can get into enough trouble as it is

L8APEX · 11-20-2007, 12:58 PM

poorly tuned turbo's on a Renesis = blown motors. I don't know everything about them, but I do know that the majority of them end up going boom. If you really want to go FI, the new Petit SuperCharger seems to be much more reliable, and makes a lot more HP and TQ, and now can achieve over 300 WHP.

EDIT:

The owner of that car, he has a catless midpipe on there, that is what gives it the sound, more than the Turbo. The blow off valve on it sounds really ricey to me, I don't care for that noise at all. The thing about the Greddy Turbo, is that it boost's HP figures, but doe snot really do all that much for actual usable performance. Yes, it is a little faster, yes there is a little more TQ, but in the end, it is not a big improvement over the stock car, and when you add in the risk, and potential for the engine going bang in a bad way, it really is not worth it. my two cents.

killjoy · 12-02-2007, 04:16 PM

Not much good usually comes from turbocharging rotaries, unless they're done right, it's not as easy as slapping it on with say, something like a Honda.

Done right though, you can get a nice bump in power

onebadapple · 12-08-2007, 01:32 PM

Do you guys say this based on turbo vs. supercharging, or just all FI in general?

Blast Radius · 12-10-2007, 09:06 PM

Supercharging is slightly better then Turbo, but they both have their issues.

I personally wouldn't have any problems with doing it myself, but I know a few great tuners that I trust

mysql · 02-23-2008, 10:12 PM

The video linked in the first post is from my first dyno session. I made around 270 whp then. Please see my later videos for the improvements since. I run a customized GT3071R turbo now, same spool time, but it'll be able to push 400 whp.

SC's are always going to be at a disadvantage for several reasons. They are tied to rpm, they are always less efficient using crank energy instead of "wasted" exhaust power, and have far more moving parts and belts. The ironic thing about a SC is people always think SC = Torque. But of the two available SC's for the RX-8, every single turbo kit outperforms them in torque. The Pettit doesn't even reach 200 tq.

My last dyno did over 300 whp and 245 lb/ft torque. When compared to a Pettit SC, I have some 60 whp gain from 3.5k rpm till 8k rpm over theirs, even though my peak hp number matches their 300. Basically under the curve the turbo out powers them. This is exactly why you never want to look at just peak power numbers.

I'm currently running 11 psi. I don't have dyno numbers yet, but I don't plan on going back till I'm 12-14 psi. I estimate the car will be over 360 whp and 270 tq by that point.

I'm still on the original engine. It has a lot of compression and has no issues. 47,000 miles. So I've been boosted for 15,000 miles so far.

Let me know if you have any questions. Make sure to check the links in my sig.

Alain · 02-25-2008, 12:22 PM

Nice to have the man behind the video here.. welcome to the forum!

11-10-2007, 01:48 PM	#1 (permalink)
RX8Dude Senior Member Join Date: May 2007 Posts: 214	Turbo RX8's? You guys seen this, or know much about turbos on these things? how good are they? reliable? ( I have my doubts ) But I would love one, listen to how mean this sounds!

11-12-2007, 09:52 AM	#3 (permalink)
Paton Member Join Date: Sep 2007 Location: Greenville, SC Posts: 67	That just sounds dangerous! I love it. __________________ Titanium Grey 2004 RX8 GT (AT) - "Stock Naked"

11-20-2007, 12:58 PM	#5 (permalink)
L8APEX Senior Member Join Date: Jun 2007 Location: Roswell, Georgia Posts: 374	poorly tuned turbo's on a Renesis = blown motors. I don't know everything about them, but I do know that the majority of them end up going boom. If you really want to go FI, the new Petit SuperCharger seems to be much more reliable, and makes a lot more HP and TQ, and now can achieve over 300 WHP. EDIT: The owner of that car, he has a catless midpipe on there, that is what gives it the sound, more than the Turbo. The blow off valve on it sounds really ricey to me, I don't care for that noise at all. The thing about the Greddy Turbo, is that it boost's HP figures, but doe snot really do all that much for actual usable performance. Yes, it is a little faster, yes there is a little more TQ, but in the end, it is not a big improvement over the stock car, and when you add in the risk, and potential for the engine going bang in a bad way, it really is not worth it. my two cents. __________________ 2004 Titanium Gray Touring 6MT 18x8 Rota Torque - TEIN Flex Coilovers - RacingBrake Slotted Rotors F&R - Mazdatrix Stainless Lines - RacingBeat Sways F&R, REVi Intake and RAM Air Duct - A/C and Oil Cooler Screens - MAZDASPEED Front Strut Brace, Shift Knob - MAZMART Water Pump - Team Moon Custom Catback Exhaust Last edited by L8APEX : 11-20-2007 at 01:02 PM.

02-23-2008, 10:12 PM	#9 (permalink)
mysql Junior Member Join Date: Feb 2008 Posts: 1	The video linked in the first post is from my first dyno session. I made around 270 whp then. Please see my later videos for the improvements since. I run a customized GT3071R turbo now, same spool time, but it'll be able to push 400 whp. SC's are always going to be at a disadvantage for several reasons. They are tied to rpm, they are always less efficient using crank energy instead of "wasted" exhaust power, and have far more moving parts and belts. The ironic thing about a SC is people always think SC = Torque. But of the two available SC's for the RX-8, every single turbo kit outperforms them in torque. The Pettit doesn't even reach 200 tq. My last dyno did over 300 whp and 245 lb/ft torque. When compared to a Pettit SC, I have some 60 whp gain from 3.5k rpm till 8k rpm over theirs, even though my peak hp number matches their 300. Basically under the curve the turbo out powers them. This is exactly why you never want to look at just peak power numbers. I'm currently running 11 psi. I don't have dyno numbers yet, but I don't plan on going back till I'm 12-14 psi. I estimate the car will be over 360 whp and 270 tq by that point. I'm still on the original engine. It has a lot of compression and has no issues. 47,000 miles. So I've been boosted for 15,000 miles so far. Let me know if you have any questions. Make sure to check the links in my sig. __________________ Turbocharged RX-8 - 307 whp, 245 lb/ft torque @ 9 PSI with GReddy turbo delete. Videos, Pictures

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11-10-2007, 03:07 PM	#2 (permalink)
onebadapple Member Join Date: Jun 2007 Location: Phoenix Posts: 59	I don't know much about that, but I wouldn't say no, that's for sure!

11-17-2007, 02:46 PM	#4 (permalink)
Alain Member Join Date: Sep 2007 Posts: 44	WOW I'll have to admit that is too much for me. I can get into enough trouble as it is

12-02-2007, 04:16 PM	#6 (permalink)
killjoy Member Join Date: Jun 2007 Posts: 36	Not much good usually comes from turbocharging rotaries, unless they're done right, it's not as easy as slapping it on with say, something like a Honda. Done right though, you can get a nice bump in power

12-08-2007, 01:32 PM	#7 (permalink)
onebadapple Member Join Date: Jun 2007 Location: Phoenix Posts: 59	Do you guys say this based on turbo vs. supercharging, or just all FI in general?

12-10-2007, 09:06 PM	#8 (permalink)
Blast Radius Member Join Date: Jun 2007 Posts: 66	Supercharging is slightly better then Turbo, but they both have their issues. I personally wouldn't have any problems with doing it myself, but I know a few great tuners that I trust

02-25-2008, 12:22 PM	#10 (permalink)
Alain Member Join Date: Sep 2007 Posts: 44	Nice to have the man behind the video here.. welcome to the forum!