EFR 6258 or GTX2867 twinscroll
#25
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No data, just driving impressions. The 6258 that I drove reminded me of my old BP4W/2554R setup. Crazy, crazy responsive and awesome low-end and mid-range power. I've driven several 2860RS cars and they don't even compare to the way a 6258 drives, and the 2867 isn't going to spool or respond faster than a 2860RS.
Look at soviet's dyno plot - 200ft.lbs at 3000rpm and 250+ft.lbs at 3500rpm. Not even Paul's old car did that, and that was a 2560R car. The EFR6258s are torque monsters.
Look at soviet's dyno plot - 200ft.lbs at 3000rpm and 250+ft.lbs at 3500rpm. Not even Paul's old car did that, and that was a 2560R car. The EFR6258s are torque monsters.
#28
No data, just driving impressions. The 6258 that I drove reminded me of my old BP4W/2554R setup. Crazy, crazy responsive and awesome low-end and mid-range power. I've driven several 2860RS cars and they don't even compare to the way a 6258 drives, and the 2867 isn't going to spool or respond faster than a 2860RS.
Look at soviet's dyno plot - 200ft.lbs at 3000rpm and 250+ft.lbs at 3500rpm. Not even Paul's old car did that, and that was a 2560R car. The EFR6258s are torque monsters.
Look at soviet's dyno plot - 200ft.lbs at 3000rpm and 250+ft.lbs at 3500rpm. Not even Paul's old car did that, and that was a 2560R car. The EFR6258s are torque monsters.
#31
Based on my experience - the 6258 is crazy responsive in singlescroll T25 config compared to any of the traditional turbos we're used to. the small EFRs are an outstanding fit for turbo miatas, in fact one of bw's engineers ran a 6258/log manifold on his personal car and LOVED it, until he had to move across the planet and sell his car.
There will be more EFR housings released next year (2013) and SEMA will be the official announcement of what's coming. I do not yet know if twinscroll will help 6258s (there is a good chance much earlier spool would make you compressor limited at surge, but dont know the limit yet and it will be different for different engines).
one nice option is you could purchase a singlescroll EFR and upgrade to the twinscroll housing in the future
There will be more EFR housings released next year (2013) and SEMA will be the official announcement of what's coming. I do not yet know if twinscroll will help 6258s (there is a good chance much earlier spool would make you compressor limited at surge, but dont know the limit yet and it will be different for different engines).
one nice option is you could purchase a singlescroll EFR and upgrade to the twinscroll housing in the future
#32
I think earlier spool would surge limit as well from playing with the match bot, but that would mean it requires less energy in the exhaust gas to spool which would theoretically decrease transient response time. Spool doesnt really concern me as long as I can hit my torque target by 3500-4k rpm, its transients that I want.
#34
No data, just driving impressions. The 6258 that I drove reminded me of my old BP4W/2554R setup. Crazy, crazy responsive and awesome low-end and mid-range power. I've driven several 2860RS cars and they don't even compare to the way a 6258 drives, and the 2867 isn't going to spool or respond faster than a 2860RS.
Look at soviet's dyno plot - 200ft.lbs at 3000rpm and 250+ft.lbs at 3500rpm. Not even Paul's old car did that, and that was a 2560R car. The EFR6258s are torque monsters.
Look at soviet's dyno plot - 200ft.lbs at 3000rpm and 250+ft.lbs at 3500rpm. Not even Paul's old car did that, and that was a 2560R car. The EFR6258s are torque monsters.
I am looking at a 2860RS compared to the 6258. Buying from Full Race, there is a $550 price difference between the two turbos. Is the 6258 that much better than the 2860RS? I am willing to spend the money if the value is there.
This will be going on a 91 with a 1.8 swap. ECU to be sorted out, I am still in the early stages of planning at this time.
I am clicking reply and completely expecting to get blasted. Thanks for any info.
#37
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