those exhausts really make that much whp gain?

ohoh · 07-25-2011, 08:01 PM

went to dyno with a friend, he only has CBE(with y pipe) changed, other than that his car is all stock. The problem is the hp gain was not even close to what manufacturer claims. That made me wonder those manufacturers claims 18whp or 20whp gains on exhaust are even true(without tuning)? Not trying to make any company looks bad, just wondering cause I am in the market for exhaust myself, thanks.

TreeSemdyZee · 07-25-2011, 09:31 PM

Ah yes. Marketing departments.
They tend to run numerous dyno passes and record the highest gain. Average gain would be more honest, but it's a case of "mine's bigger than yours".

Methodical4u · 07-25-2011, 09:32 PM

Not all exhaust systems are going to yield massive results... some are rather poor actually... the Fast intentions seems to have the highest numbers with a full CBE with test pipes getting about 25 or so whp.

I myself would likely go with their exhaust with the Motordyne ART test pipes, their pricey, but they aren't as loud as test pipes, but have gains over all test pipes so far that i've seen... but there could be some out there that do better.

The more expensive exhausts are USUALLY expensive for a reason... they get results.... but that's not a hard and fast rule either.

b1adesofcha0s · 07-25-2011, 09:45 PM

It also depends on the type of dyno and the temperature as well.

Red__Zed · 07-25-2011, 09:47 PM

you're doing pretty well if you see half of what they claim.

Methodical4u · 07-25-2011, 09:47 PM

Quote:

Originally Posted by b1adesofcha0s

It also depends on the type of dyno and the temperature as well.

yeah, good point.

Methodical4u · 07-25-2011, 09:49 PM

I saw (I believe this is correct) a Z with a FI exhaust and test pipes, G3 intake and Stillen headers make 324 hp at the wheels. I don't know if that's the highest out there for an NA Z, but I haven't seen in anyone's sig more than that... but that doesn't mean it can't be done.

Red__Zed · 07-25-2011, 09:51 PM

Quote:

Originally Posted by Methodical4u

I saw (I believe this is correct) a Z with a FI exhaust and test pipes, G3 intake and Stillen headers make 324 hp at the wheels. I don't know if that's the highest out there for an NA Z, but I haven't seen in anyone's sig more than that... but that doesn't mean it can't be done.

raw numbers mean less than nothing.

Methodical4u · 07-25-2011, 10:00 PM

Quote:

Originally Posted by Red__Zed

raw numbers mean less than nothing.

It also ran 317 hp on a dyno dynamics... does that mean nothing also?

Red__Zed · 07-25-2011, 10:08 PM

Quote:

Originally Posted by Methodical4u

It also ran 317 hp on a dyno dynamics... does that mean nothing also?

means nothing without a baseline taken immediately prior, and then only the delta matters.

^ that graph, with a couple of modifications to correction parameters, can yield as low as ~450 whp and as high as ~1000whp.

leighspped · 07-25-2011, 09:58 PM

I felt a good gain from headers and catback from F.I., no dyno though. With intake and tune put a solid 334whp and 252wftlb

b1adesofcha0s · 07-25-2011, 10:02 PM

When I installed my Berk cbe, I definitely felt the difference on the butt dyno :P

Red__Zed · 07-25-2011, 10:09 PM

Quote:

Originally Posted by b1adesofcha0s

When I installed my Berk cbe, I definitely felt the difference on the butt dyno :P

exhausts are tough because the extra sound always makes you feel faster

b1adesofcha0s · 07-25-2011, 10:34 PM

Quote:

Originally Posted by Red__Zed

exhausts are tough because the extra sound always makes you feel faster

True, but a bunch of other people felt the difference as well, but that could have been the sound too. I swear I saw the speedo go up quicker than before when I got into the triple digit range

Red__Zed · 07-25-2011, 10:36 PM

Quote:

Originally Posted by b1adesofcha0s

True, but a bunch of other people felt the difference as well, but that could have been the sound too. I swear I saw the speedo go up quicker than before when I got into the triple digit range

gtfi

07-25-2011, 08:01 PM	#1 (permalink)
ohoh Base Member Join Date: Aug 2009 Location: Atlanta Posts: 4 Drives: 09 NISSAN 370Z PW M6 Rep Power: 15	those exhausts really make that much whp gain? went to dyno with a friend, he only has CBE(with y pipe) changed, other than that his car is all stock. The problem is the hp gain was not even close to what manufacturer claims. That made me wonder those manufacturers claims 18whp or 20whp gains on exhaust are even true(without tuning)? Not trying to make any company looks bad, just wondering cause I am in the market for exhaust myself, thanks.

07-25-2011, 09:45 PM	#4 (permalink)
b1adesofcha0s A True Z Fanatic Join Date: Jan 2011 Location: MD Posts: 40,963 Drives: HypeTrain Choo Choo! Rep Power: 141	It also depends on the type of dyno and the temperature as well. __________________ Project: b1adeZmobile (2009 370Z) \| Uprev Tune by AAM Competition \| Berk Exhaust Project: b1adeZmobile 2.0 (2014 C7 Z51) \| Corsa Xtreme Exhaust

07-25-2011, 09:58 PM	#11 (permalink)
leighspped Enthusiast Member Join Date: Feb 2011 Location: Morristown Posts: 444 Drives: US Rep Power: 14	I felt a good gain from headers and catback from F.I., no dyno though. With intake and tune put a solid 334whp and 252wftlb __________________ Performance: Fast Intentions LTH + CBX + Injen CAI + UpRev + KW3 + Whiteline sway bars + short throw shifter + 34r oil cooler = 335whp + (OS Giken Clutch and Diff) Interior : Recaro seat + Alpine HU and Rockford Fosgate Amp and Speakers + Passport 9500ci + JDM shift knob + LED's Forged avant garde m310's 19x9 19x12 RE-11

07-25-2011, 10:02 PM	#12 (permalink)
b1adesofcha0s A True Z Fanatic Join Date: Jan 2011 Location: MD Posts: 40,963 Drives: HypeTrain Choo Choo! Rep Power: 141	When I installed my Berk cbe, I definitely felt the difference on the butt dyno :P __________________ Project: b1adeZmobile (2009 370Z) \| Uprev Tune by AAM Competition \| Berk Exhaust Project: b1adeZmobile 2.0 (2014 C7 Z51) \| Corsa Xtreme Exhaust

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07-25-2011, 09:31 PM	#2 (permalink)
TreeSemdyZee Premium Member Join Date: Dec 2009 Location: Kentuck-IANA Age: 60 Posts: 4,883 Drives: '09 370 & ‘14 Juke Rep Power: 27408	Ah yes. Marketing departments. They tend to run numerous dyno passes and record the highest gain. Average gain would be more honest, but it's a case of "mine's bigger than yours".

07-25-2011, 09:32 PM	#3 (permalink)
Methodical4u A True Z Fanatic Join Date: Jun 2011 Location: Maryland Posts: 1,393 Drives: 11 370 6mt pw w/sp Rep Power: 15	Not all exhaust systems are going to yield massive results... some are rather poor actually... the Fast intentions seems to have the highest numbers with a full CBE with test pipes getting about 25 or so whp. I myself would likely go with their exhaust with the Motordyne ART test pipes, their pricey, but they aren't as loud as test pipes, but have gains over all test pipes so far that i've seen... but there could be some out there that do better. The more expensive exhausts are USUALLY expensive for a reason... they get results.... but that's not a hard and fast rule either.

07-25-2011, 09:47 PM	#5 (permalink)
Red__Zed A True Z Fanatic Join Date: Jul 2010 Location: window seat Posts: 28,940 Drives: Mostly on two wheels Rep Power: 119	you're doing pretty well if you see half of what they claim.

07-25-2011, 09:49 PM	#7 (permalink)
Methodical4u A True Z Fanatic Join Date: Jun 2011 Location: Maryland Posts: 1,393 Drives: 11 370 6mt pw w/sp Rep Power: 15	I saw (I believe this is correct) a Z with a FI exhaust and test pipes, G3 intake and Stillen headers make 324 hp at the wheels. I don't know if that's the highest out there for an NA Z, but I haven't seen in anyone's sig more than that... but that doesn't mean it can't be done.