Any gain to be had running open downpipe?
Jul 12, 2005, 02:11 PM
#1
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Any gain to be had running open downpipe?
Ok im going to the track, i have a 3inch helix exhaust and testpipe. On my silvia i would remove the exhaust after the test pipe (it was also 3 inch) and there was a good gain in spool time, and maybe a tad of power. Has anyone had good results with the on the evo? Its only 2 bolts and the hangers but i had to ask before i try
Jul 12, 2005, 02:25 PM
#2
Originally Posted by turboex
Ok im going to the track, i have a 3inch helix exhaust and testpipe. On my silvia i would remove the exhaust after the test pipe (it was also 3 inch) and there was a good gain in spool time, and maybe a tad of power. Has anyone had good results with the on the evo? Its only 2 bolts and the hangers but i had to ask before i try
Jul 12, 2005, 02:32 PM
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this might be stupid, but running exhaustless from the downpipe could be a little dangerous couldn't it? Are you going to risk getting CO poisoning for a 100th of a second?
Jul 12, 2005, 02:34 PM
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no more dangerous that running catless.....unless you are parked in a closed garage, you'll be fine
I ahve doine this on an Evo once....spool time with a stock turbo went totally down the drain FWIW
I ahve doine this on an Evo once....spool time with a stock turbo went totally down the drain FWIW
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Jul 12, 2005, 02:34 PM
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Originally Posted by Thegame
this might be stupid, but running exhaustless from the downpipe could be a little dangerous couldn't it? Are you going to risk getting CO poisoning for a 100th of a second?
Jul 12, 2005, 02:39 PM
#9
Originally Posted by Thegame
this might be stupid, but running exhaustless from the downpipe could be a little dangerous couldn't it? Are you going to risk getting CO poisoning for a 100th of a second?
I had no issue with spoolup, and I don't see how anyone would have issue with spoolup at the drag strip, since you're never below 5500 rpm...
Jul 12, 2005, 03:26 PM
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Originally Posted by Nez136
running leaded gas will mess up your front o2 sensor
Not when the exhaust is disconnected
BTW be careful of fuel cut.. I did this once on stock ECU and car wanted to boost 21psi and would hit fuel cut.
Jul 12, 2005, 03:36 PM
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Originally Posted by gsujeff55
you don't disconnect your FRONT o2 sensor.....that wouldn't work too well if you took off the o2 housing
Doh.. your right. hahaha
Most cars i have worked on have both O2s by the cat.. forgot the DSMs have them in the o2 housing.
Anyway.. runing it a few times wont hurt, but it would probably be best to pull the O2 sensor and get a plug for the bung.