E-cutout = How lean ?
08-13-2007, 01:14 PM
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E-cutout = How lean ?
Hi, just a quick question, my car was tuned at a 11:5:1 A/F at 8 pounds or so.....on a greddy cat-back with a 2.25" test pipe and 2.5" DP.
Now I'm planning on putting a 2.5" cutout on my DP, I know it will become leaner but will it become lean to the point where I would have to get a re-tune ? Let me know thanks !
Now I'm planning on putting a 2.5" cutout on my DP, I know it will become leaner but will it become lean to the point where I would have to get a re-tune ? Let me know thanks !
08-13-2007, 01:45 PM
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my a/f ratio or boost didnt change at all when i installed my e-cutout. nothing that noticable anyways. i guess because it was a cutout and not open downpipe.. because half the exhaust still goes out the back. every setup is different though.
08-15-2007, 06:45 PM
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Re: (Offer)
I've seen between .3-.5 leaner with my setup(e-cutout). Try it and see is the best I can tell you. As long as you stay below 12:1, you'll be fine.
08-15-2007, 10:39 PM
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Re: (B18cHatch06)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18cHatch06 »</TD></TR><TR><TD CLASS="quote">my car runs about .5 leaner... this on an all-motor set-up though</TD></TR></TABLE>
mine probably runs .5-.7 leaner on a boosted motor. Versus 2.25" full exhaust with 2.5" downpipe and cutout.
mine probably runs .5-.7 leaner on a boosted motor. Versus 2.25" full exhaust with 2.5" downpipe and cutout.
08-16-2007, 05:50 AM
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Re: E-cutout = How lean ? (Offer)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Offer »</TD></TR><TR><TD CLASS="quote">Hi, just a quick question, my car was tuned at a 11:5:1 A/F at 8 pounds or so.....on a greddy cat-back with a 2.25" test pipe and 2.5" DP.
Now I'm planning on putting a 2.5" cutout on my DP, I know it will become leaner but will it become lean to the point where I would have to get a re-tune ? Let me know thanks !</TD></TR></TABLE>
tune it with the E-cut OPEN. you won't have any problem. I'm using one too and once you get it, I don't think you'd want to close it unless you're going out to see you GF at night. lol
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Offer »</TD></TR><TR><TD CLASS="quote">What kind of gains can you see with one of these things at the same psi ?</TD></TR></TABLE>
it depends but in my car it pulls GOOD.
Now I'm planning on putting a 2.5" cutout on my DP, I know it will become leaner but will it become lean to the point where I would have to get a re-tune ? Let me know thanks !</TD></TR></TABLE>
tune it with the E-cut OPEN. you won't have any problem. I'm using one too and once you get it, I don't think you'd want to close it unless you're going out to see you GF at night. lol
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Offer »</TD></TR><TR><TD CLASS="quote">What kind of gains can you see with one of these things at the same psi ?</TD></TR></TABLE>
it depends but in my car it pulls GOOD.
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08-16-2007, 12:51 PM
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Re: (raceACCORDingly)
tune with the cutout open, then when its closed you might be half a point richer or so. you will more than likely see less boost or at least slower spool wiht it closed though, so be ready for that to happen
08-17-2007, 05:26 PM
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Re: (blackeg)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blackeg »</TD></TR><TR><TD CLASS="quote">tune with the cutout open, then when its closed you might be half a point richer or so. you will more than likely see less boost or at least slower spool wiht it closed though, so be ready for that to happen</TD></TR></TABLE>
I've actually seen quicker spool with mine closed. It doesnt begin to spool as fast, but it hits full boost quicker and moves the powerband down a little
I've actually seen quicker spool with mine closed. It doesnt begin to spool as fast, but it hits full boost quicker and moves the powerband down a little
08-17-2007, 08:16 PM
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Re: (PA MATT)
going from a 3" downpipe with a tapered 2.5" exhaust and stock muffler TO a 3' open downpipe i went from about 11.8:1 (muffler) to about 13.0:1 (3" open downpipe) and my boost went from 10psi to 13psi. just a heads up...
08-17-2007, 08:41 PM
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Re: (the.hamburglar)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by the.hamburglar »</TD></TR><TR><TD CLASS="quote">going from a 3" downpipe with a tapered 2.5" exhaust and stock muffler TO a 3' open downpipe i went from about 11.8:1 (muffler) to about 13.0:1 (3" open downpipe) and my boost went from 10psi to 13psi. just a heads up...</TD></TR></TABLE>
was that on a internal wastegate ?
was that on a internal wastegate ?
08-18-2007, 05:36 AM
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Re: (hoya_10fintec)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hoya_10fintec »</TD></TR><TR><TD CLASS="quote">you need to tune your car with the E-cut open... that's way too off. My boost level never changed. weird. 
</TD></TR></TABLE>
its common to reach higher boost levels when you free up your exhaust.
</TD></TR></TABLE>its common to reach higher boost levels when you free up your exhaust.
08-18-2007, 08:47 AM
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Re: (SOHC_MShue)
So if I have a 8.7 psi spring in my tial 38mm...and I add the cutout....will it intend to boost higher then 8.7-9 ??
08-18-2007, 09:06 AM
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Re: (SOHC_MShue)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHC_MShue »</TD></TR><TR><TD CLASS="quote">
its common to reach higher boost levels when you free up your exhaust. </TD></TR></TABLE>
well i guess my exhaust was already pretty free flowing then...
its common to reach higher boost levels when you free up your exhaust. </TD></TR></TABLE>
well i guess my exhaust was already pretty free flowing then...
08-18-2007, 09:36 AM
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Re: (mike93eh2)
The AFR is not the only thing to consider. A significant change in backpressure will also change the ignition timing requirements. If you are already tuned with it closed, I would re-tune with it open.
08-18-2007, 11:13 AM
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Re: (Offer)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Offer »</TD></TR><TR><TD CLASS="quote">So if I have a 8.7 psi spring in my tial 38mm...and I add the cutout....will it intend to boost higher then 8.7-9 ??</TD></TR></TABLE>
my car has an 8.7 psi spring and it makes no less than 12 psi without even a boost controller installed. thats with a full 3" downpipe and exhaust
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