Originally Posted by ChrisHolmes2014
(Post 4929044)
My intention with the SC is not to pursue high revs power but rather mid range torque with a rev limit of 8000rpm.
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Originally Posted by OtherSyde
(Post 4929061)
And you're right - in general, superchargers are great for low-to-mid-range power/torque, whereas turbochargers are what you want for mid-to-high-range power.
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Originally Posted by OtherSyde
(Post 4929061)
... And you're right - in general, superchargers are great for low-to-mid-range power/torque, whereas turbochargers are what you want for mid-to-high-range power....
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Originally Posted by jcbrx8
(Post 4929084)
Have any SC VDs to compare HP / Trq?
Note the highest whp SC dyno we've ever seen (in yellow) is bettered pretty much by every turbo dyno everywhere in the power band (including the Greddy) . https://www.rx8club.com/attachment.p...1&d=1299737176 |
Originally Posted by Brettus
(Post 4929100)
It's all readily available info on the highest whp thread anyway ....
Note the highest whp SC dyno we've ever seen (in yellow) is bettered pretty much by every turbo dyno everywhere in the power band (including the Greddy) . |
Originally Posted by Brettus
(Post 4929067)
...Unless you are talking about an oversized turbo with poor spoolup .............. and sure there are plenty of those around.
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Originally Posted by TeamRX8
(Post 4929151)
well there was this in the same thread, stock numbers are a bit low though
I do believe there's value in the drive-abilty of the "direct" response of a supercharger vs. a turbo, but beyond that... these HP and torque dynos clearly indicate which mode of FI has the higher HP & torque...across the rpm range on the Renesis. |
not really, but I can appreciate you not wanting to rub it in :suspect:
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Excuse my randomly jumping in after a 2 year hiatus...
I am going the S/C route due to concerns others had posted about the turbo trapping more heat in the exhaust ports (especially the center iron) which could be not so great for the Renesis. This makes sense to me since a turbo is adding a restriction to the exhaust flow, though I haven't seen (and don't know how to find) proof of this. So my decision on S/C vs. turbo was more for longevity (hopefully) than from an expected torque vs horsepower, throttle response, driveability, etc. standpoint. I also liked the more complete nature of the Pettit kit, though since purchasing it, I have swapped out almost all the components, save the S/C and castings, so that didn't end up mattering much. Is this still fair to say a S/C helps keep the engine more reliable than a turbo with the more modern turbo kits for these cars? I mean a turbo is a turbo as far as exhaust restriction/heat buildup, regardless of the kit. And inb4: rear mount turbos are stupid. Also, for anyone who wonders where I went for the last couple years: I sent the Pettit castings to be polished, the shop moved, closed, held my parts hostage, and then finally gave them back looking worse than when they went in. I had someone else "fix" them then ceramic coat them. Well, they got coated without the polish residue being cleaned off, so they're not polished very well and have clear ceramic coating with black shit underneath. My only options are to leave it that way or sandblast them and re-re-polish. I also had a bunch of stuff powder coated that somehow took a year to do, and some parts were damaged/lost in the process. I'm currently looking for replacements (luckily this is just stock RX-8 stuff, not Pettit related). I'm hoping to be running in the spring. We'll see. I've been paying attention to some of what you guys have going on, and everyone's 8's are looking pretty nice! Keep holding down the fort here. I'll be back in action soon. |
those are good points about the exhaust port situation, but at the boost/power level of what we see with the SC it’s not really applicable to that. The issue being that most of the turbos you’re referencing for that conclusion were undersized and/or having insufficient turbine flow or held back by other issues such as poor design or lack of proper resources/capabilities to do it right.
I can appreciate how much easier this is to bolt on without getting your hands dirty dealing with all that though, but again, without intending to bash or knock going SC, the serpentine belt issue and power loss drag of having to drive all that friction and momentum mechanically are always going to be offsetting factors. A cog belt system can at least address the serpentine slippage problem, but will require making the effort to accomplish it and assumes there’s a suitable belt available in the proper width and length. That’s more of an issue for creating higher boost than Pettit had intended. . |
Has anyone junked the Pettit charge cooler and replaced it with an air/air intercooler?
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