klikai8

Hey Everyone,

this is a dead section but let me bring some light and see if it would work out
I will finally get my ported S2 R3 back from IRP with RX7 Apex seals/IRP 2-piece seals (How much more reliable it is, but still no real evidence or proof that is 100% beneficial for the engine)
Now as the thread suggested. I looked for boosting options and applications, finally settling on a supercharger instead of a turbocharger, due to heat and simplicity
initially, I was considering the DNA kit but since it's a centrifugal design, but the amount of custom-made parts needed was a lot so I decided to simply go with a Pettit Supercharger kit,
I did some research, but essentially everything would bolt on like it would in an S1 but with the expectation that the OMP pumps now directly sits on the top of the engine, so the challenges will be making brackets that would physically move the OMP away plus making new lines for the OMP Pump.
If anyone has anything else they think about please let me know. I do intend to do 5-7 track days a year and rest is daily averaging 3000-5000 miles a year

But before I proceed with this progress, I understand Renesis is not made to be boosted due to two major implications, High Compression Ratio and Weak Side Seals. And 13REW swap is an obvious good option to swap in. But it isn't much faster unless you spend even more $$
I have spoken to numerous people about boosting and the reviews were very mixed. The general idea is that if done conservatively, tuned properly with properly setup cooling, and obviously maintained it will get a decent life out of the engine and it usually will have more wear and tear but won't magically blow a seal somewhere, as long as I know what I'm doing and the engine builder knows what they are doing
The rest is basically saying it is a bad idea and just don't do it it will always end badly.

I am fine with the street ported S2 engine, way more than enough I can handle on the track anyways before I really need more power, however, I would not mine at all to simply having more power since I already have a Pettit Supercharger Kit just sitting there
Please let me know what everyone thinks.

I sent a few DMs but didn't get a response but I wonder if it is better to just post.

Brettus

iTrader: (2)

Good luck - think you could be opening a can of worms attempting to move omp setup though.

klikai8

That is what I'm contemplating I will attempt to re-use the original fittings, I failed to see why braided lines would not work, and I don think I have to worry about pressure drop on the length of the lines.
Be honest if it wasn't because S2 you can't delete the OMP pump I would have just deleted the OMP pump.

What problem do you think I would run into ?
Moon told me he ran in to some issues but mainly just the tuning.

Brettus

iTrader: (2)

I've disassembled an S2 omp setup and it kinda blew my mind how complex it was . No Idea what problems you will encounter TBH but it looks daunting.
I've tuned a turbo S2 up to around 350whp and it goes great but we left the omp alone.

klikai8

Well, I'm not so much differentiating the OMP pump but just physically moving the brackets away a little bit.
How was the reliability of a 350WHP S2?

I'm also looking for someone to tune my Pettit Supercharger setup once successfully installed, can I aks you to tune it? And do you versatune?

Kevin

Brettus

iTrader: (2)

The S2 has been going on my manifold setup about 9 months and done two track days - before that it had two other turbo setups (that I tuned also) and done multiple track days on those as well. So it's been around a while and is still going strong.
Not doing tunes other than for my own setups sorry.

Smikella

I dynoed at 320whp a year ago on E85 @12psi and have about 1,000 miles on it including autocross track days. I have versatuner but it is not enough to tune the car, I had gone Adaptronic standalone wire in ECU (no longer supported) but now have to redo the wiring to install Haltech Elite which my tuner will support. These ECU's give you MAP based control while safety monitoring fuel pressure, ethanol content, ect. This has been my biggest headache but the boosted RX8 is so fun to drive!

klikai8

oh for Pettit supercharger on an S1 or S2? Now will using Haltech be able to pass inspections like enabling the monitors through OBD2 and run CAN lines and such?
I wanted to preserve the original ECU

TeamRX8

iTrader: (25)

without the factory PCM there is no way to have OBD2 functionality.

you might be able to do it with the previous Adaptronic Select piggybacked onto the factory PCM, but as mention they no longer support it after Haltech discontinued the brand in May 2022. There are tuners who still work with it though. Or tune it yourself. I have it on an REW Turbo RX8 and it’s fairly decent for what it is, but is not really a long term solution if it dies and a replacement can’t be found. I do have an Adaptronic Modular ecu to replace the Select piggyback at some point.
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Smikella

I am running an EFR 7670 turbo on S2 and have not wired the Haltech yet so not sure how it operates yet. I preserved factory ECU and use that to pass emissions but it is not always easy. I have 2nd throttle body wired to factory ECU to trick it in thinking its controlling the engine and use versatuner to block codes that are not emissions related like SSV/VDI solenoids that are components actually being controlled by Adaptronic ECU.

Brettus

iTrader: (2)

Would you mind posting your dyno ?

Smikella

93 Octane @10psi



E85 @12psi (Dome pressure 14.4psi & 26 EMAP)

Brettus

iTrader: (2)

Many thanks for that . What is 'dome pressure' ? Pre intercooler?

Smikella

The pressure sourced off the turbo that is applied to wastgate diaphragm to hold it closed.

TeamRX8

iTrader: (25)

oh nice, post some pics when you can

I have an EFR 7163 fitted with a hybrid turbine housing and SX-E compressor cover that I’m hoping is going to spool faster and make more power than the EFR 7670. Working on the turbo manifold for it now, but for an REW engine.

surprised your emap is that high, must be the 0.83 A/R IWG then?
.

Smikella

I have been meaning to get a build thread going to contribute to S2 forced induction but the turbo project never seems to end lol

The emap surprised me to as I am actually running .92 IWG. I went back and forth between 7670 vs 8374 but since I primary autocross I wanted quicker spool than more top end. It definitely spools but I still wonder if the 8374 would have been a better.

Brettus

iTrader: (2)

That's why you do a build thread ... to plot your journey. Starting with a dyno is actually pretty rare around here. Many never progress much beyond 'this is my build list'.

klikai8

Brett what made you guys do turbo instead of supercharger?
I understand turbo is more efficient and better suited for rotaries but doesn't the heat and other potential hadarus kill the engine faster?

TeamRX8

iTrader: (25)

It just depends on your goal. It’s not well understood in the rotary arena that even the 1.05 EWG turbine housing, the largest offered on the 7670, is on the small side for a 2-rotor engine exhaust flow requirement. Which is why I decided to go with a larger hybrid turbine housing selection wrt max turbine flow.
.
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Brettus

iTrader: (2)

Basically ...much more power ...everywhere. And yes there is potential for overheating the exhaust ports, but as with any issue, it's avoidable.
Paying attention to side seal lubrication / oil temp/water temp and EMAP goes a long way to eliminating the issues. Not to mention , making sure the setup and tune is optimal.