Evil's Brettus Build Thread
03-01-2023, 01:41 PM
#51
That sounds pretty awesome. I'm def not as knowledgeable as I'd like to be, but if its new, fits, and is similar enough to the Garrett I'd totally be down for using it. Trying not to deviate too far from the formula, but it doesn't sound like this would.
03-01-2023, 02:03 PM
#52
If you can get it to fit ...it sounds good to me. I would be very surprised if it does though, knowing how tight in every direction, the small frame G30 is down there.
Also worth considering for a track car... the G30 has a high temp turbine wheel and turbine housing (both 1050C rated) and nature of this setup is that it will see VERY high egts. I don't know if EFR will be as resilient.
Also worth considering for a track car... the G30 has a high temp turbine wheel and turbine housing (both 1050C rated) and nature of this setup is that it will see VERY high egts. I don't know if EFR will be as resilient.
Last edited by Brettus; 03-01-2023 at 02:05 PM.
03-01-2023, 02:16 PM
#53
Fitment and temp tolerance are definitely my two priorities. It's for sure going to get hot AF considering I keep the engine between 6-9k the entire session of 30-45m at COTA. The enduro is longer but the track is smaller and we try to maintain a strategic pace and let the car cool on the front straight.
03-01-2023, 04:18 PM
#54
Also ... I'm not sure if we talked about this, but endurance racing is def. not something the manifold was expected to have to ....endure. The testing I've done is fairly extensive but has not gone to the extremes that you will subject it to. Same can be said for the Renesis itself actually.
I'm really looking forward to seeing how the setup performs .... it's definitely exploring the boundaries of what the engine/manifold combo is capable of however so ... baby steps
I'm really looking forward to seeing how the setup performs .... it's definitely exploring the boundaries of what the engine/manifold combo is capable of however so ... baby steps
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moko (02-17-2024)
03-01-2023, 04:25 PM
#55
Oh I'm very accepting of the fact that I'm in uncharted territory, so y'alls help and advice has been awesome. It's also why it's taken so long to get everything from the rear diff to the engine "ready". Like most racing I accept I'm going to break, fix, break, fix, etc. So far I've managed to ensure the car will survive the next baby step...boost...
It's all for fun at the end of the day. Sick sadistic expensive fun. A toxic relationship I can't break free from. 🤣
It's all for fun at the end of the day. Sick sadistic expensive fun. A toxic relationship I can't break free from. 🤣
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RotaryMachineRx (03-01-2023)
03-01-2023, 08:24 PM
#56
the ceramic EFR turbine wheel does have a lower temp rating the the Garrett, but being the same approximate size is why the spool difference will be noticeable. It’s been discussed a lot on RX7Club, but nobody can point to a single EFR failure for this reason including the vendors selling them. Honestly though, you should not be running a Renesis past 1650°F EGT any way for side seal life, which is below the turbine limit. Part of it may be the issue is potentially greater for the larger wheel sizes like 80mm. It is entirely new and it possibly won’t fit. The diameters are close to the G30 T3 (which is bigger than the same A/R V-band), but the CHRA is longer and this will move the compressor forward compared to the G30. Let me take a few measurements to be sure.
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EvilHoHo (03-01-2023)
03-01-2023, 09:52 PM
#57
Sounds to me like I need to add an EGT sensor regardless and set a warning either way. The team did a good job keeping the car temps under control the last time, so it shouldn't be that big of a deal provided we are mindful of the limits.
03-01-2023, 11:19 PM
#58
sensors, two rotors, two EGT sensors
unfortunately with the OE ecu you have no control over them individually for timing, injector duration, injector phasing
the rear rotor always has a different requirement than the front rotor, always …
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unfortunately with the OE ecu you have no control over them individually for timing, injector duration, injector phasing
the rear rotor always has a different requirement than the front rotor, always …
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Last edited by TeamRX8; 03-01-2023 at 11:25 PM.
04-15-2023, 08:47 PM
#59
my apology for not getting back to you sooner on the EFR7163. Was always buried in other things when out at the shops (three separate ones in the same complex, plus a covered parking space), and it kept getting by me.
Surprisingly, it’s pretty much a match for the G30-600 with 1.01 T3 housing according to the dimensions on their flange diagram compared what I measured on the EFR. The G30 0.83 T3 is smaller in a few spots, but I didn’t directly compare against it since I thought Brettus already had the 1.01 T3 on it previously.
The thing that I wasn’t expecting is it’s only 1.5 - 2mm longer on overall length (edge of compressor inlet to the turbine discharge flange. I was expecting that to be longer given how open the CHRA is on the EFR is than the Garrett. Everything else I can check measurements on is pretty much the same. There are some dimensions in other directions not shown, but the only way to find out if it will fit at this point is to try it.
The compressor inlet is 3.5” dia. compared to 3.0” on the Garrett, not sure if that’s an issue or not for routing intake piping?
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Surprisingly, it’s pretty much a match for the G30-600 with 1.01 T3 housing according to the dimensions on their flange diagram compared what I measured on the EFR. The G30 0.83 T3 is smaller in a few spots, but I didn’t directly compare against it since I thought Brettus already had the 1.01 T3 on it previously.
The thing that I wasn’t expecting is it’s only 1.5 - 2mm longer on overall length (edge of compressor inlet to the turbine discharge flange. I was expecting that to be longer given how open the CHRA is on the EFR is than the Garrett. Everything else I can check measurements on is pretty much the same. There are some dimensions in other directions not shown, but the only way to find out if it will fit at this point is to try it.
The compressor inlet is 3.5” dia. compared to 3.0” on the Garrett, not sure if that’s an issue or not for routing intake piping?
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Last edited by TeamRX8; 04-15-2023 at 08:52 PM.
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EvilHoHo (04-18-2023)
04-18-2023, 10:39 PM
#70
I love both of y'all for pushing and advancing this whole thing. Hell I might just try both because I'm blessed with the financial ability to.
If there's one thing my high performance corporate training has taught me is that fostering different opinions and people will always yield the best results.
Y'all are awesome. Don't forget that. You bring so much to the table. You both make me think of all the things I never thought about. You both make me learn so very very much just trying to keep up with your enormous knowledge.
I'm humbled when either of you talk. And doubly so when you both agree.
At the end of the day...if it blows up...I don't care...I'm in this to learn. I'm stupid all the time. That's how I learn.
And I look to both of you to call me stupid. Because I respect you and know you are both just trying to do the best you can.
09-14-2023, 02:01 PM
#71
I forgot to post the last update before the summer pause in racing around here.
The water pump cavitates at high rpm. The long straights at COTA have been cooking the car. In the heat, bad things happened like it pulls power and/or puked up oil from the breather again.
I've got an EWP install this weekend and retry at COTA again in two weeks. If nothing else breaks I'll finally get the turbo installed.
The water pump cavitates at high rpm. The long straights at COTA have been cooking the car. In the heat, bad things happened like it pulls power and/or puked up oil from the breather again.
I've got an EWP install this weekend and retry at COTA again in two weeks. If nothing else breaks I'll finally get the turbo installed.
09-14-2023, 04:52 PM
#74
he’s referring to engine rpm
it really doesn’t matter that much which mechanical pump you use, as they aren’t the real factor to consider, but you could actually have both the mechanical pump fed by the electrical pump to eliminate cavitation and play it safe. It defeats the purpose of being the most efficient choice though. Otherwise the EWP does trump any of the MWPs on the track, but requires the proper setup.
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it really doesn’t matter that much which mechanical pump you use, as they aren’t the real factor to consider, but you could actually have both the mechanical pump fed by the electrical pump to eliminate cavitation and play it safe. It defeats the purpose of being the most efficient choice though. Otherwise the EWP does trump any of the MWPs on the track, but requires the proper setup.
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09-14-2023, 05:29 PM
#75
The S2 and Mazmart pumps are a better design and flow more than the stock S1.
I agree that an EWP can work better than the stock pump but for long term reliability you can't beat the stock pump.