BorgWarner EFR Turbos
#141
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I saw that as well, it was pretty interesting.
Here is another comparison
GTX3076R vs EFR 7670 vs GTX35R
From the looks of it, EFR spools a tad bit slower than the GTX30 but makes roughly the power of a GTX35.
Here is another comparison
GTX3076R vs EFR 7670 vs GTX35R
From the looks of it, EFR spools a tad bit slower than the GTX30 but makes roughly the power of a GTX35.
#143
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It would be pretty awesome if every third word in this thread wasn't blatantly incorrect, guys. This could have been a pretty good comparison thread but instead it's full of total garbage.
#144
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So, 7670 spools faster than a GT3076R, a tad slower than a GTX3076R but makes the power of a GTX3586R sounds like good news to me. I would love to see how well the twin scroll performs next to the single scroll though, Sav do you have any input on the difference?
#145
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I'll play with a 7064 .92 TS on the black car later this summer, once our 6258 development is done. (oops, probably said too much there. )
I have two problems with the NASIOC/Perrin testing, BTW.
-Similar boost levels. The EFRs are designed to be highly efficient at high boost - the big, long technical brochure(that I actually read through cover to cover) talks about how they specifically gave up some low-boost efficiency to make the turbo work at 35-40psi. Comparing a GTX to an EFR at only ~21psi or whatever is a little harsh on the EFR - the GTX is a lot more efficient, the maps show that, but the EFR still maintains the same power.
-Similar timing map. Again, the EFR opens up the exhaust which should allow for a lot more timing than a comparable GT/GTX setup. Same reason why Hustler and I make so much more torque than .64 A/R cars - open up the turbine and you can run a lot more timing. Opening up the turbine and NOT running more timing will give you... the same power and less spool.
It's not practical for someone like Perrin, and I applaud the guy for giving us that data, but I would have liked to see him choose two of the turbos and spend 3-4 hours tuning each setup - dial in the fuel map, play with the spark, and experiment a bit, and see what he ended up with on each setup. Just slapping the turbos in is a cool "controlled experiment", but that's not going to give a full picture of the true performance.
#148
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I talked with my buddy Reed at SuperNaturalTurbo (also a dealer for BW - and built my current setup) and for some reason he really wants to go with the T3 flanged 7064 with the smaller .83 A/R (compared to the other 2 T4 7064s) - he says it should be available in a couple weeks, FWIW.... we'll see. Input on why the T3 flange over the twin scroll T4s? In any case, he's researching some more and will trust his judgement... just a curious question. Mind you - this will be for an E85 application.
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Realistically 350-400 with ease - but its a track car so spool time is important. On the smaller EFRs his thinking was the T25 .64 A/R where too small, but the T4 .92 A/R where too big - Maybe that's why he stuck with the T3 .83 A/R
#154
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According to Geoff from Full-Race on my car he said I should be able to hit full boost by 4,000 RPM with a Twin Scroll T4 .92 A/R 7064. Take it for what it's worth no one has done testing (twin scroll) on a Miata that I know of, I will be the first.
Fae, what are you talking about no one is making that much power? I will easily make over 500 whp and I am going to be running a twin scroll set-up.
Fae, what are you talking about no one is making that much power? I will easily make over 500 whp and I am going to be running a twin scroll set-up.
#159
Word back from BW/Full Race.
The CHRA bolts are non-spiralocked A2-80 grade stainless.
Said there's no indication of them failing.
http://www.fullermetric.com/technica...less_steel.htm
Looked it up here, that should be about the same as an M20 graded bolt. Pretty impressive stuff.
The CHRA bolts are non-spiralocked A2-80 grade stainless.
Said there's no indication of them failing.
http://www.fullermetric.com/technica...less_steel.htm
Looked it up here, that should be about the same as an M20 graded bolt. Pretty impressive stuff.