3inch single exit exhaust too big for N/A

blacknismoZ · 12-06-2011, 10:53 PM

just making sure lol... btw how do you like your cnt catback w/ test pipe? loud?

edub370 · 12-06-2011, 10:57 PM

not too loud at all. very low rumble at idle actually but really opens up up top.

here's a vid to give u an idea

370z CNT cat back and test pipes - YouTube

to be honest nobody that has heard it has even noticed im running test pipes

blacknismoZ · 12-06-2011, 11:08 PM

damn sound really good. what kind of test pipe? is your check engine light on? notice any hp increase?

edub370 · 12-06-2011, 11:16 PM

Nissan 370Z Z34 Infiniti G37 Coupe VQ37VHR 3.7L 08-11 Exhaust Test Pipe Pipes | eBay

those tp's (or some similar to that with the o2 extender).

no check engine lights, and after driving a stock z then hopping back in this, this definately feels waaay more responsive and getting those cats out really helps the engine breath better up top

blacknismoZ · 12-06-2011, 11:24 PM

thanks for the info... now im really leaning toward CNT Catback.. did u install the test pipe urself ive heard those bolts are pain to remove?

edub370 · 12-07-2011, 08:21 AM

i actually did not do the test pipe, only piece i didnt do actually. i think it will prolly come down to how many miles u have on your car to determine if the bolts have gone thru a ton of heat cycles or not. the less miles u have, the better the chance it will come off without fighting u.

corbin09 · 12-07-2011, 09:21 AM

I ran test pipes, a TopSpeed Y pipe, into a 3 inch pipe through a 3 inch hks muffler. It was loud as hell. I gained 3hp up top, but it did feel like I lost torque lower in the RPMS. I now have a Nismo exhaust with a custom X pipe and resonated TP.. to me it is the best of both worlds... The extra 3hp didnt make up for my hatch rattling from the exhaust noise.

blacknismoZ · 12-07-2011, 10:13 AM

Quote:

Originally Posted by corbin09

I ran test pipes, a TopSpeed Y pipe, into a 3 inch pipe through a 3 inch hks muffler. It was loud as hell. I gained 3hp up top, but it did feel like I lost torque lower in the RPMS. I now have a Nismo exhaust with a custom X pipe and resonated TP.. to me it is the best of both worlds... The extra 3hp didnt make up for my hatch rattling from the exhaust noise.

nice.. u have video?

VDC_OFF · 12-07-2011, 10:57 AM

Quote:

Originally Posted by corbin09

I ran test pipes, a TopSpeed Y pipe, into a 3 inch pipe through a 3 inch hks muffler. It was loud as hell. I gained 3hp up top, but it did feel like I lost torque lower in the RPMS. I now have a Nismo exhaust with a custom X pipe and resonated TP.. to me it is the best of both worlds... The extra 3hp didnt make up for my hatch rattling from the exhaust noise.

Hmm, now you are scaring me. I have a Top Secret exhaust and am going to put on a Top Speed Y Pipe and Berk HFC's soon. I hope it doesnt get annoying loud.

awkwardturtle · 12-07-2011, 10:40 AM

Yeah, I'd definitely like to see a dyno of the 3" vs. stock. Here's a dyno of a 70mm exhaust vs. a 3" exhaust on a measley 2.0L Civic SI motor. No tuning:

You can see that the 3" gains probably 5 whp up top, and maybe as much as 10 ft lbs of torque at the vtec crossover.. and it loses maybe 2 ft lbs of torque down low. That's with zero tuning. If a 2.0L 4 cylinder motor can benefit from a 3" exhaust, it stands to reason that a much larger motor such as the Z's can as well. Enough with the backpressure nonsense, we need to see some dynos!

Red__Zed · 12-07-2011, 12:51 PM

Quote:

Originally Posted by awkwardturtle

Yeah, I'd definitely like to see a dyno of the 3" vs. stock. Here's a dyno of a 70mm exhaust vs. a 3" exhaust on a measley 2.0L Civic SI motor. No tuning:

You can see that the 3" gains probably 5 whp up top, and maybe as much as 10 ft lbs of torque at the vtec crossover.. and it loses maybe 2 ft lbs of torque down low. That's with zero tuning. If a 2.0L 4 cylinder motor can benefit from a 3" exhaust, it stands to reason that a much larger motor such as the Z's can as well. Enough with the backpressure nonsense, we need to see some dynos!

Strong source....runs weren't even made on the same day, made by the manufacturer of the exhaust, and they are comparing max power runs rather than averages. Besides, the flow characteristics of the k20a are completely different...it's an freaking inline four.

3" exhaust on the z makes sense if for some reason you go single, or dual for FI.

I do not understand why someone would run a single on the z(single turbo build notwithstanding) in the first place. Might as well take advantage of the scavenging afforded by an x or h pipe. The firing order across banks supports it, and the gains are proven by systems like berk. Hell, even the nismo picks up a couple horses through the h.

EDIT: People that truly believe there are gains to be had do it themselves, they don't post about it asking others to do legwork for them. I look forward to seeing your dyno results when (if) you ever do it.

corbin09 · 12-07-2011, 11:02 AM

I dont have a video.. I may be able to post up a dyno chart however... Let me e-mail my tuner and see what he has on file. With non-res tp and the topspeed y pipe into a muffler that was pretty much a straight pipe was very loud. I think with HFC's you will be happy. It will be loud but shouldnt drone as much.

VDC_OFF · 12-12-2011, 11:35 AM

Quote:

Originally Posted by corbin09

I dont have a video.. I may be able to post up a dyno chart however... Let me e-mail my tuner and see what he has on file. With non-res tp and the topspeed y pipe into a muffler that was pretty much a straight pipe was very loud. I think with HFC's you will be happy. It will be loud but shouldnt drone as much.

Btw, I had the Top Speed y pipe and Berk HFC's put on Friday to go with my Top Secret exhaust... My God this thing screams now! It does rattle the trunk a bit revving past 4-5k but it a much better response. Even stepping on it while cruising at 60 in 6 gear it accelerates. Before I had to downshift to 5. Im happy

blacknismoZ · 12-07-2011, 12:01 PM

Thanks... I think I'll go with ARK grip or CNT.

awkwardturtle · 12-07-2011, 04:34 PM

Somehow I knew you and your "expertise" would chime in on that, lol. Do you just troll 8thcivic all day looking for **** on there to wing back at me? lawls. Btw, f20c? No...

You really think an exhaust producer would fake those gains? GTFO.

12-06-2011, 10:53 PM	#1 (permalink)
blacknismoZ Base Member Join Date: Mar 2010 Location: PDX Posts: 166 Drives: 2010 370Z NISMO Rep Power: 16	just making sure lol... btw how do you like your cnt catback w/ test pipe? loud? __________________ HKS filter, DBA 5000/4000, HPS, Stoptech. bone stock dyno at Surgeline tuning 294whp 251tq.

12-06-2011, 10:57 PM	#2 (permalink)
edub370 A True Z Fanatic Join Date: May 2011 Location: KCMO Posts: 3,458 Drives: 09 370z S/T 6MT Rep Power: 21	not too loud at all. very low rumble at idle actually but really opens up up top. here's a vid to give u an idea 370z CNT cat back and test pipes - YouTube to be honest nobody that has heard it has even noticed im running test pipes __________________ 09 370Z ST 6MT//Injen CAI//Greddy CBE//TP//TSW's//Swifts//Stillen lip//Whiteline sways 326whp/268tq

12-06-2011, 11:08 PM	#3 (permalink)
blacknismoZ Base Member Join Date: Mar 2010 Location: PDX Posts: 166 Drives: 2010 370Z NISMO Rep Power: 16	damn sound really good. what kind of test pipe? is your check engine light on? notice any hp increase? __________________ HKS filter, DBA 5000/4000, HPS, Stoptech. bone stock dyno at Surgeline tuning 294whp 251tq.

12-06-2011, 11:16 PM	#4 (permalink)
edub370 A True Z Fanatic Join Date: May 2011 Location: KCMO Posts: 3,458 Drives: 09 370z S/T 6MT Rep Power: 21	Nissan 370Z Z34 Infiniti G37 Coupe VQ37VHR 3.7L 08-11 Exhaust Test Pipe Pipes \| eBay those tp's (or some similar to that with the o2 extender). no check engine lights, and after driving a stock z then hopping back in this, this definately feels waaay more responsive and getting those cats out really helps the engine breath better up top __________________ 09 370Z ST 6MT//Injen CAI//Greddy CBE//TP//TSW's//Swifts//Stillen lip//Whiteline sways 326whp/268tq

12-06-2011, 11:24 PM	#5 (permalink)
blacknismoZ Base Member Join Date: Mar 2010 Location: PDX Posts: 166 Drives: 2010 370Z NISMO Rep Power: 16	thanks for the info... now im really leaning toward CNT Catback.. did u install the test pipe urself ive heard those bolts are pain to remove? __________________ HKS filter, DBA 5000/4000, HPS, Stoptech. bone stock dyno at Surgeline tuning 294whp 251tq.

12-07-2011, 08:21 AM	#6 (permalink)
edub370 A True Z Fanatic Join Date: May 2011 Location: KCMO Posts: 3,458 Drives: 09 370z S/T 6MT Rep Power: 21	i actually did not do the test pipe, only piece i didnt do actually. i think it will prolly come down to how many miles u have on your car to determine if the bolts have gone thru a ton of heat cycles or not. the less miles u have, the better the chance it will come off without fighting u. __________________ 09 370Z ST 6MT//Injen CAI//Greddy CBE//TP//TSW's//Swifts//Stillen lip//Whiteline sways 326whp/268tq

12-07-2011, 09:21 AM	#7 (permalink)
corbin09 Track Member Join Date: Jun 2009 Location: Dallas tx Posts: 665 Drives: 370z Rep Power: 281	I ran test pipes, a TopSpeed Y pipe, into a 3 inch pipe through a 3 inch hks muffler. It was loud as hell. I gained 3hp up top, but it did feel like I lost torque lower in the RPMS. I now have a Nismo exhaust with a custom X pipe and resonated TP.. to me it is the best of both worlds... The extra 3hp didnt make up for my hatch rattling from the exhaust noise.

12-07-2011, 10:40 AM	#10 (permalink)
awkwardturtle Base Member Join Date: Nov 2011 Location: minnesota Posts: 98 Drives: 07 Civic SI Rep Power: 14	Yeah, I'd definitely like to see a dyno of the 3" vs. stock. Here's a dyno of a 70mm exhaust vs. a 3" exhaust on a measley 2.0L Civic SI motor. No tuning: You can see that the 3" gains probably 5 whp up top, and maybe as much as 10 ft lbs of torque at the vtec crossover.. and it loses maybe 2 ft lbs of torque down low. That's with zero tuning. If a 2.0L 4 cylinder motor can benefit from a 3" exhaust, it stands to reason that a much larger motor such as the Z's can as well. Enough with the backpressure nonsense, we need to see some dynos!

12-07-2011, 11:02 AM	#12 (permalink)
corbin09 Track Member Join Date: Jun 2009 Location: Dallas tx Posts: 665 Drives: 370z Rep Power: 281	I dont have a video.. I may be able to post up a dyno chart however... Let me e-mail my tuner and see what he has on file. With non-res tp and the topspeed y pipe into a muffler that was pretty much a straight pipe was very loud. I think with HFC's you will be happy. It will be loud but shouldnt drone as much.

12-07-2011, 12:01 PM	#14 (permalink)
blacknismoZ Base Member Join Date: Mar 2010 Location: PDX Posts: 166 Drives: 2010 370Z NISMO Rep Power: 16	Thanks... I think I'll go with ARK grip or CNT. __________________ HKS filter, DBA 5000/4000, HPS, Stoptech. bone stock dyno at Surgeline tuning 294whp 251tq.

12-07-2011, 04:34 PM	#15 (permalink)
awkwardturtle Base Member Join Date: Nov 2011 Location: minnesota Posts: 98 Drives: 07 Civic SI Rep Power: 14	Somehow I knew you and your "expertise" would chime in on that, lol. Do you just troll 8thcivic all day looking for **** on there to wing back at me? lawls. Btw, f20c? No... You really think an exhaust producer would fake those gains? GTFO.

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