3inch single exit exhaust too big for N/A

awkwardturtle · 12-07-2011, 12:13 AM

Quote:

Originally Posted by edub370

dual 3" WILL lose you low end torque. back ressure creates torque. sure u might gain slight hp up top but the butt dyno will feel like there is less power because of the torque loss.

and before anyone asks "how do u know if a 3" will lose power? have u tried it?"... well no i havent, but i understand how cars work...

"Horsepower sells cars, torque wins races".

-Enzo Ferrari-

You sound EXACTLY - like word for word - like everyone used to on the 8thcivic forums. "We need backpressure or we'll lose power down low". That was the mantra for at least 2-3 years. Everyone chanted it. One day a 3" comes out, proves every single person wrong.

Maybe you are right, maybe your'e wrong. Someone should actually test it before saying that, though, because everyone used to be like you until it was proven wrong.

edub370 · 12-07-2011, 12:16 AM

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 · 12-07-2011, 12:24 AM

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, 09:21 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, 10:21 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, 11:13 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?

awkwardturtle · 12-07-2011, 11:40 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!

VDC_OFF · 12-07-2011, 11:57 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.

corbin09 · 12-07-2011, 12:02 PM

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.

Footloose301 · 12-07-2011, 12:58 PM

Quote:

Originally Posted by 98intrigue

It won't be a problem... Depending on a few things, I'll be running FI LTHs with my 3" single exhaust with a HKS Hi-Power muffler.

No more turbo?

blacknismoZ · 12-07-2011, 01:01 PM

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

Red__Zed · 12-07-2011, 01:51 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.

awkwardturtle · 12-07-2011, 05:34 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.

Red__Zed · 12-07-2011, 08:02 PM

Quote:

Originally Posted by awkwardturtle

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...

I have been a vendor on there since the forum started bro

Quote:

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

it has never happened before

there is a reason people don't believe gains unless they are seen on a third party dyno. Motordyne (and many other reputable shops) offer dyno credits for people to independently verify...and those are the only circumstances you can even begin to believe the claimed power gains.

b1adesofcha0s · 12-07-2011, 08:15 PM

Quote:

Originally Posted by Red__Zed

I have been a vendor on there since the forum started bro

it has never happened before

there is a reason people don't believe gains unless they are seen on a third party dyno. Motordyne (and many other reputable shops) offer dyno credits for people to independently verify...and those are the only circumstances you can even begin to believe the claimed power gains.

It would be stupid for a company to show that their exhaust gives minimal gains. They're not going to sell many like that.

12-07-2011, 12:16 AM	#17 (permalink)
edub370 A True Z Fanatic Join Date: May 2011 Location: KCMO Posts: 3,458 Drives: 09 370z S/T 6MT Rep Power: 20	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

12-07-2011, 12:24 AM	#18 (permalink)
blacknismoZ Base Member Join Date: Mar 2010 Location: PDX Posts: 166 Drives: 2010 370Z NISMO Rep Power: 15	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, 09:21 AM	#19 (permalink)
edub370 A True Z Fanatic Join Date: May 2011 Location: KCMO Posts: 3,458 Drives: 09 370z S/T 6MT Rep Power: 20	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, 01:01 PM	#26 (permalink)
blacknismoZ Base Member Join Date: Mar 2010 Location: PDX Posts: 166 Drives: 2010 370Z NISMO Rep Power: 15	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.

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12-07-2011, 10:21 AM	#20 (permalink)
corbin09 Track Member Join Date: Jun 2009 Location: Dallas tx Posts: 665 Drives: 370z Rep Power: 280	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, 11:40 AM	#22 (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, 12:02 PM	#24 (permalink)
corbin09 Track Member Join Date: Jun 2009 Location: Dallas tx Posts: 665 Drives: 370z Rep Power: 280	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, 05:34 PM	#28 (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.