Boosting my RX-8
#2
SARX Legend
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Boosting my RX-8
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.
#3
SARX Legend
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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.
#4
SARX Legend
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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.
#5
FULLY SEMI AUTOMATIC
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10lbs of boost isnt low on a renny. 9k only runs about 2psi lol
#6
SARX Legend
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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.
#7
FULLY SEMI AUTOMATIC
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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
#8
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#9
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You gonna eat that?
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In before the lock.
#11
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lulz im so glad i clicked this thread
#12
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#14
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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.
#19
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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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OtherSyde (02-21-2018)
#21
rev it up
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.
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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OtherSyde (02-21-2018)
#22
SPOOLN8
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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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OtherSyde (02-21-2018)
#23
Registered
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.
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.
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.
Originally Posted by Brettus
The Pettit is pretty kind on the engine at 8psi on pump gas so long as the tune is good.
_
Last edited by OtherSyde; 02-21-2018 at 06:08 PM.
#24
Boosted Kiwi
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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?
_
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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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OtherSyde (02-21-2018)
#25
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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.
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 10:39 AM.
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OtherSyde (02-22-2018)