Dyno results - OB breaks 300bhp
#46
Drifting
You might want to think about running a little bit bigger tailpipe. I have 3" inlets (due to headers so this part need not apply) merging into a Y with a 2.5" venturi in it and then back up to 3" all way out the back. 2.5" would probably be ok, but fitting 3" is easy.
#47
Nordschleife Master
#48
Racer
Thread Starter
Well guys I will dyno again after I get the new exhaust next week !!
My exhaust guy is adamant that I do not need 3" with power of less than 350hp. He says 2" on the Y-pipe and 3" for the system after the Y-pipe will be fine.
Have trawled RL and read everything on the topic. Any other comments welcome.
Joel
My exhaust guy is adamant that I do not need 3" with power of less than 350hp. He says 2" on the Y-pipe and 3" for the system after the Y-pipe will be fine.
Have trawled RL and read everything on the topic. Any other comments welcome.
Joel
#49
Supercharged
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I'm in the process of building my exhaust too, so I'm interested in what you find. Hope to have the car running again in a couple weeks (need to re-install the oil cooler and re-build my breather setup).
#50
Rennlist Member
Well guys I will dyno again after I get the new exhaust next week !!
My exhaust guy is adamant that I do not need 3" with power of less than 350hp. He says 2" on the Y-pipe and 3" for the system after the Y-pipe will be fine.
Have trawled RL and read everything on the topic. Any other comments welcome.
Joel
My exhaust guy is adamant that I do not need 3" with power of less than 350hp. He says 2" on the Y-pipe and 3" for the system after the Y-pipe will be fine.
Have trawled RL and read everything on the topic. Any other comments welcome.
Joel
Once I get the red ****ter back on the road in the next 6mths it will be an interesting match - a 1984 928 Euro S2 with 120k miles on the clock vs. a cherished Frankenstein of a 1980 928
#51
Rennlist Member
sorry, he is an "xxxx". going from stock 2.5" piping to 3.5" piping got 10hp with no other changes. thats with 190hp to 200rwhp.
Well guys I will dyno again after I get the new exhaust next week !!
My exhaust guy is adamant that I do not need 3" with power of less than 350hp. He says 2" on the Y-pipe and 3" for the system after the Y-pipe will be fine.
Have trawled RL and read everything on the topic. Any other comments welcome.
Joel
My exhaust guy is adamant that I do not need 3" with power of less than 350hp. He says 2" on the Y-pipe and 3" for the system after the Y-pipe will be fine.
Have trawled RL and read everything on the topic. Any other comments welcome.
Joel