Waiting on FI

BG370z · 01-04-2014, 12:36 PM

Quote:

Originally Posted by luigi90210

if you want more power but dont want to spend the money on a full 3in exhaust, get a 3in electric cutout welded on to your test pipe

i have the Z1 test pipes on to the Greddy TIC Turbo exhaust. Never heard of cutting test pipes before.

Chuck33079 · 01-04-2014, 12:40 PM

It would be a pain in the ***. There's not enough room in there if you've got external wastegates. You'd have to weld them in way downstream. You'd also have to get another map for when the cutouts are open. And electric cutouts fail all the time. And they're not cheap.

esfourteen · 01-04-2014, 02:24 PM

Quote:

Originally Posted by Chuck33079

It would be a pain in the ***. There's not enough room in there if you've got external wastegates. You'd have to weld them in way downstream. You'd also have to get another map for when the cutouts are open. And electric cutouts fail all the time. And they're not cheap.

I've thought about cutouts before, you could install them just after the test pipes and it would still be a big improvement, but you absolutely do not need another tune for a larger exhaust, I wish people would stop spreading information like this when they don't fully understand things. They certainly seem prone to failure though which is a concern.

luigi90210 · 01-04-2014, 05:40 PM

Quote:

Originally Posted by Chuck33079

It would be a pain in the ***. There's not enough room in there if you've got external wastegates. You'd have to weld them in way downstream. You'd also have to get another map for when the cutouts are open. And electric cutouts fail all the time. And they're not cheap.

You don't need to retune unless boost starts spiking to stupidly high levels, I have seen eclipses with cutouts spike upwards of 5psi with the cutout open vs closed.

Also the more expensive cutouts have low failure rates with good warranties. QTP(I think that's the companies name) has an extremely low failure rate and has a leak proof design, but their cutouts are expensive, close to 300 for one. The cutouts that use the butterfly valve design always leak eventually due to soot build up preventing the valve from fully closing.

Chuck33079 · 01-04-2014, 07:04 PM

Quote:

Originally Posted by esfourteen

I've thought about cutouts before, you could install them just after the test pipes and it would still be a big improvement, but you absolutely do not need another tune for a larger exhaust, I wish people would stop spreading information like this when they don't fully understand things. They certainly seem prone to failure though which is a concern.

You don't need a retune for a larger exhaust, but you do for the cutout. You're essentially going from a 2.5 in to no exhaust.

esfourteen · 01-04-2014, 07:12 PM

Quote:

Originally Posted by Chuck33079

You don't need a retune for a larger exhaust, but you do for the cutout. You're essentially going from a 2.5 in to no exhaust.

no. no you don't.

Chuck33079 · 01-04-2014, 07:18 PM

Quote:

Originally Posted by esfourteen

no. no you don't.

You would just run the cutouts with no adjustment to the tune? I would absolutely get it on the dyno and see if anything needed to be adjusted.

esfourteen · 01-05-2014, 06:13 PM

Quote:

Originally Posted by Chuck33079

You would just run the cutouts with no adjustment to the tune? I would absolutely get it on the dyno and see if anything needed to be adjusted.

if you're on a stock block and afraid of making too much power, sure put it on a dyno and see if you want to turn down the boost. as far as AFR and timing goes, going from a 2.5" to 3" cutouts won't require a change to the tune

BG370z · 01-06-2014, 07:11 AM

Are there bigger test pipes(GTM?)
i am running with no cats.

Chuck33079 · 01-06-2014, 08:36 AM

Quote:

Originally Posted by BG370z

Are there bigger test pipes(GTM?)
i am running with no cats.

GTM has 3" downpipes, but they won't mate up to a 2.5" exhaust without some work.

01-04-2014, 12:40 PM	#182 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	It would be a pain in the ***. There's not enough room in there if you've got external wastegates. You'd have to weld them in way downstream. You'd also have to get another map for when the cutouts are open. And electric cutouts fail all the time. And they're not cheap. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

01-06-2014, 07:11 AM	#189 (permalink)
BG370z Base Member Join Date: Dec 2010 Location: New Brunswick,Canada Posts: 230 Drives: 2009 Black 370Z Rep Power: 14	Are there bigger test pipes(GTM?) i am running with no cats. __________________ GTM Stage II-Greddy-Defi-More Stuff

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