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Boosting my RX-8

Old 02-20-2017, 03:02 PM
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Boosting my 8

Yee

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Old 02-20-2017, 03:21 PM
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Boosting my RX-8

Originally Posted by RotardGuy View Post
So I'm not new to the 13b renesis but its still some stuff I lack knowledge of. I plan on boosting it but run low boost, give or take 10lbs. I plan on a full rebuild with stronger seals, basic streetport, sx300x3 borg warner turbo. I'm gonna run a C02 freezer kit mounted to the intercooler to keep intake temps down. Cause I know one thing that kills boosted renesis is the seals failing early because of excessice heat from the turbo. I also thought about water meth injection system but would that be an overkill? And has anyone ever used any of these systems on their boosted renesis?

Why don't you search and find out? Then start your own thread if you have questions. Bumping a thread that you didn't even bother to read isn't going to help you.
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Old 02-20-2017, 04:39 PM
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Again, if you had read (big colored stickies at the top of the page), you would know why you could not start a thread. But really you don't need to start a thread, you need to read threads that already exist.
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Old 02-21-2017, 10:36 AM
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You read them but nothing? I highly doubt that.. There is a **** ton of discussion on meth injection and the cryo stuff has been discussed many times as well. And if you under stood the basics of turbocharging an RX-8 (had you read) you would know that the turbo family you are considering would require a lot of planning and customization to fit a Renesis. Not to mention it would be pointless just to run low boost. know what you are getting into.
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Old 02-21-2017, 10:56 AM
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10lbs of boost isnt low on a renny. 9k only runs about 2psi lol
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Old 02-21-2017, 10:59 AM
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So then why run such a large turbo? And 10psi is not low boost (for an RX-8 anyway) it's average boost. Again, you don't really know what you are getting into, so it's time for you to spend a few weeks reading threads.
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Old 02-21-2017, 11:11 AM
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9k knows more about boosting an 8 than most people on this board. when he tells you to search its because he did his homework and doesnt like spoon feeding people. an inproperly sized turbo isnt going to make a good driver even if its on the weekends. if its a show car go with a huge top mount (cause you wont see a low mount anyway) and trailer it to the shows
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Old 02-21-2017, 11:21 AM
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Old 02-21-2017, 11:26 AM
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"crowds love big turbos". Well there we have it. Your RX-8 will get turbocharged around the same time the RX-9 gets released. And spoon feeding is exactly what you are seeking.
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Old 02-21-2017, 11:44 AM
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In before the lock.


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Old 02-21-2017, 11:47 AM
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lulz im so glad i clicked this thread
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Old 02-21-2017, 11:48 AM
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Old 02-21-2017, 12:00 PM
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Originally Posted by rotardguy View Post
crowds love big turbos.
Boosting my RX-8-big_turbo.jpg

Boosting my RX-8-one-big-turbo.jpg
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Old 02-19-2018, 03:21 AM
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Originally Posted by 9krpmrx8 View Post
So then why run such a large turbo? And 10psi is not low boost (for an RX-8 anyway) it's average boost. Again, you don't really know what you are getting into, so it's time for you to spend a few weeks reading threads.
So I've been nonchalantly perusing this thread and saw this... Out of curiosity, what would you consider to be low boost? Would 8psi on a Pettit supercharger be what you would call "low boost?" Or is that more in the danger zone of "medium boost?"

And secondly, the lowest boost on a turbo RX8 that I've personally heard of anyone running is 7psi on RotaryMachineRX's car - until I just read 200.mph state above that you're running 2psi. Is he for real, or is he just being sarcastic and I'm being autistic and missing the internet sarcasm..? I mean I am getting a real internet sarcasm vibe here, but I'm really not sure, since I'm well aware of how badly our engines hold up under any significant boost... Sorry if I'm missing the obvious, I just had to ask.
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Old 02-19-2018, 10:53 AM
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200 was just being 200, he doesn't even own an RX-8. Anything over 10psi on a renny is pushing your luck, low boost would be stock Greddy kit boost which is like 5-7psi IIRC.
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Old 02-19-2018, 01:33 PM
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I pushed my BNR GReddy up to 14psi for a "brief" unexpected period back in the day.

fun fun
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Old 02-19-2018, 02:15 PM
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Yeah mine tends to creep up to 13psi or so every once in a while.
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Old 02-19-2018, 03:17 PM
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Originally Posted by boricua13 View Post
YAY S#!tposting!

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Old 02-20-2018, 10:43 PM
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Originally Posted by 9krpmrx8 View Post
200 was just being 200, he doesn't even own an RX-8. Anything over 10psi on a renny is pushing your luck, low boost would be stock Greddy kit boost which is like 5-7psi IIRC.
OK cool. I'm just not savvy on turbos at all and thought there might be some engine-preserving technique I'd never heard of involving running super-low PSI for your daily driving and then dialing it up when you feel like having some fun on the weekend or something.

I think the ~280-290ish horsepower and ~200ish lb-ft torque granted by the 8psi Pettit setup will keep me perfectly happy, and I'm glad it's basically in the "low boost" range, which translates for me into "low chance of replacing my engine within 10-20k miles" is all.
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Old 02-20-2018, 10:50 PM
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I'm happy running mine on pump gas at 10psi but it's a lot bigger than a Greddy . To run a Greddy up that high you should be using an octane enhancer . The Pettit is pretty kind on the engine at 8psi on pump gas so long as the tune is good.
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Old 02-21-2018, 06:58 AM
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My Hymee supercharged car was on 8psi. The supercharger kit was added when the engine had already clocked up 98 000km and seen over 60 track days before the supercharger was added.

The car then clocked up a further 50 000km of boost. It would have lasted a lot longer however it died at the drags as I revved it past the buzzzer in 4th gear trying to set a better quarter mile time.

It was a silly mistake. I also made several vacuum line changes and should have done a new tune.

I now have a much stronger engine with better cooling, steel apex seals, porting, dowels and billet studs. I will probably up the boost to 10psi.

I also plan to get back to the track and better my lap times and probably stay away from the drags.
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Old 02-21-2018, 09:44 AM
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Originally Posted by OtherSyde View Post

And secondly, the lowest boost on a turbo RX8 that I've personally heard of anyone running is 7psi on RotaryMachineRX's car
Yeah that was back before I had a boost controller. Essentially anyone running the stock Greddy kit without a boost controller was limited to that boost range by the wastegate diaphragm (there was ways to screw around with the wastegate actuator arm to up the boost).

With the BNR turbo I'd feel completely comfortable running 10psi and my aim would be more for 12psi as a low setting and 14psi as a high setting with that turbo.
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Old 02-21-2018, 06:58 PM
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Originally Posted by skc View Post
My Hymee supercharged car was on 8psi. The supercharger kit was added when the engine had already clocked up 98 000km and seen over 60 track days before the supercharger was added.

The car then clocked up a further 50 000km of boost. It would have lasted a lot longer however it died at the drags as I revved it past the buzzzer in 4th gear trying to set a better quarter mile time.

...

I now have a much stronger engine with better cooling, steel apex seals, porting, dowels and billet studs. I will probably up the boost to 10psi.
Your engine sounds like a beast now! Although I didn't know anyone really tried to set quarter-mile times in our cars since they're mostly handling/cornering cars; I thought even with FI they're just not super-fast among sports cars unless they are insanely built-up..? And incidentally ~98,000km equates to almost exactly 61,000 miles, which was exactly where my engine was before it popped a coolant hose on the freeway last week and proceeded to pump all of its coolant out all over the hot southern California freeway and fry its internal coolant seals within 2-3 minutes - the engine was probably pretty well dead before I even got the Check Engine light and started trying to pull off the road to shut it down as steam poured out of the freshly-painted hood vents

Not sure exactly what went wrong to cause said failure - but I will say that upon thinking about it, the previous owner was a young Army guy who described the car as "not fast enough" for him and went on to immediately buy a Mustang GT auto-trans which he drove aggressively... Which leads me to believe he didn't exactly familiarize himself with the nuances of rotary maintenance - probably drove it hard, didn't feed it enough oil, he still had the crap stock ignition kit and wires in it at 34,000 miles, definitely didn't premix, installed a ridiculous hot-air-intake cone filter right in the hot engine bay (see the early pics in my albums - it's neon green), and I suspect he might have put non-FL22-compatible coolant in it (with silicates and borates), which (in combination with hard driving in a very hot environment in Hawaii without any cooling mods for 34k miles) would go far in explaining the early and easy coolant seal/hose degradation and failure. Maybe I screwed something up though too, I didn't know wtf I was doing the first year or so I had the car.

On the bright side, with my original engine's combustion chambers full of coolant, I get my odometer rest to zero courtesy of a quality rebuild by Rotary Resurrection which has several Atkins seal upgrades that will hopefully also aid in longevity as well as their higher-quality bracket of rotor housings, so I guess at least my SC will go on a strong, fresh engine (once I break it in for a few thousand miles, that is).

Originally Posted by RotaryMachineRX
With the BNR turbo I'd feel completely comfortable running 10psi and my aim would be more for 12psi as a low setting and 14psi as a high setting with that turbo.
Wow really? 12psi as a "low" setting? You'd trust that level of boost on what I'm assuming is a relatively stock Renesis? This is news to me - I was under the impression anything over 10 or 11 psi required some hefty engine hardening O.o Like I said though, I'm not versed in turbocharging by any means, I'm just trying to keep up.

Originally Posted by Brettus
The Pettit is pretty kind on the engine at 8psi on pump gas so long as the tune is good.
Well at least this is great news Would you consider MazdaManiac to be a decent tuner? This new engine is going to be taken care of the right way from day one - I'm aiming for 60-80k+ miles, Pettit-boosted at 8psi. Is this a sensible goal or am I being way too optimistic?
_

Last edited by OtherSyde; 02-21-2018 at 07:08 PM.
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Old 02-21-2018, 07:20 PM
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Originally Posted by OtherSyde View Post
Well at least this is great news Would you consider MazdaManiac to be a decent tuner? This new engine is going to be taken care of the right way from day one - I'm aiming for 60-80k+ miles, Pettit-boosted at 8psi. Is this a sensible goal or am I being way too optimistic?
_
Yeah MM is a good tuner (almost as good as me ) , just a bit of a 'special' person.
No not to optimistic on the mileage , but will depend on many factors like how you drive it and maintain it ...obviously.
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Old 02-22-2018, 11:34 AM
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Originally Posted by OtherSyde View Post

Wow really? 12psi as a "low" setting? You'd trust that level of boost on what I'm assuming is a relatively stock Renesis? This is news to me - I was under the impression anything over 10 or 11 psi required some hefty engine hardening O.o Like I said though, I'm not versed in turbocharging by any means, I'm just trying to keep up.
What do you call hefty engine hardening? Rx7 seals and larger studs? Other than that there isn't much more "hardening" to be done and I'm not going to re-build my engine to install mods like that if it doesn't need to be rebuilt at the time. Slash for a time was running 16+ psi, though he was also running ethanol. Up here in Canada (at least where I am) you are pretty much stuck with pump gas so 14psi would be the max I'd be willing to push. It would be driven 90% of the time at 12PSI and I would just set my EBC up for a higher 14PSI setting for those desperate times of need.

I used to use MM for tuning too, he did a perfectly fine job, no complaints at all but I found my customer experience to be a better and much more personal through Brett.

Also I think the goals for mileage and boost pressure are completely reasonable.

Last edited by RotaryMachineRx; 02-22-2018 at 11:39 AM.
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