Nissan 370Z Forum  

Stock Nismo and TT?

Some news! Husam and I have been chatting, and I moved to an ebay exhaust, and turned up the boost. I turned it up the boost from 8 to 10

Go Back   Nissan 370Z Forum > Nissan 370Z Tech Area > Engine & Drivetrain > Forced Induction


Like Tree19Likes

Reply
 
LinkBack Thread Tools Display Modes
Old 03-27-2018, 03:46 PM   #16 (permalink)
Base Member
 
Join Date: Oct 2016
Location: TX
Posts: 141
Drives: 2013 Nismo 370z 6MT
Rep Power: 34
ihiryu has a reputation beyond reputeihiryu has a reputation beyond reputeihiryu has a reputation beyond reputeihiryu has a reputation beyond reputeihiryu has a reputation beyond reputeihiryu has a reputation beyond reputeihiryu has a reputation beyond reputeihiryu has a reputation beyond reputeihiryu has a reputation beyond reputeihiryu has a reputation beyond reputeihiryu has a reputation beyond repute
Default

Some news! Husam and I have been chatting, and I moved to an ebay exhaust, and turned up the boost. I turned it up the boost from 8 to 10 psi, and lets just say I did a pull, and was pleasantly surprised! I was soooo surprised that that I had thought it was a lot more than two. Then I saw my datalog and it showed another 2 psi!

Currently I'm at 12 psi, on my street tune, and it feels way stronger, but my injector duty cycle is at 80%, so I'm scrambling to finalize my water meth system.
Jayhovah likes this.
ihiryu is offline   Reply With Quote
Old 03-31-2018, 08:56 AM   #17 (permalink)
A True Z Fanatic
 
BOLIO 671's Avatar
 
Join Date: Mar 2010
Location: GUAHAN
Posts: 1,198
Drives: To & From then Back
Rep Power: 3399
BOLIO 671 has a reputation beyond reputeBOLIO 671 has a reputation beyond reputeBOLIO 671 has a reputation beyond reputeBOLIO 671 has a reputation beyond reputeBOLIO 671 has a reputation beyond reputeBOLIO 671 has a reputation beyond reputeBOLIO 671 has a reputation beyond reputeBOLIO 671 has a reputation beyond reputeBOLIO 671 has a reputation beyond reputeBOLIO 671 has a reputation beyond reputeBOLIO 671 has a reputation beyond repute
Default

Quote:
Originally Posted by BOLIO 671 View Post
Sori to thread jack... But since we’re on the topic is there a significant difference in using a 2.5” Exhaust over a 3”? Will 1/2 an inch make that much difference on the spool?
Anybody able to chime in on this ^^^^^
__________________
2013 Nismo Z34 / FI TT #091 / IG: @lilzilla_z34
BOLIO 671 is offline   Reply With Quote
Old 03-31-2018, 09:24 AM   #18 (permalink)
Premium Member
 
Jayhovah's Avatar
 
Join Date: May 2013
Location: St. Pete, FL
Posts: 3,848
Drives: 520whp Fire Breather
Rep Power: 86951
Jayhovah has a reputation beyond reputeJayhovah has a reputation beyond reputeJayhovah has a reputation beyond reputeJayhovah has a reputation beyond reputeJayhovah has a reputation beyond reputeJayhovah has a reputation beyond reputeJayhovah has a reputation beyond reputeJayhovah has a reputation beyond reputeJayhovah has a reputation beyond reputeJayhovah has a reputation beyond reputeJayhovah has a reputation beyond repute
Default

Quote:
Originally Posted by ihiryu View Post
Some news! Husam and I have been chatting, and I moved to an ebay exhaust, and turned up the boost. I turned it up the boost from 8 to 10 psi, and lets just say I did a pull, and was pleasantly surprised! I was soooo surprised that that I had thought it was a lot more than two. Then I saw my datalog and it showed another 2 psi!

Currently I'm at 12 psi, on my street tune, and it feels way stronger, but my injector duty cycle is at 80%, so I'm scrambling to finalize my water meth system.
Only 2psi, but opening the exhaust allowed for a lot more overall flow. You would have made a good bit more power without even turning up the boost!

Sent from my Nexus 6P using Tapatalk
__________________
2013 Gun Metallic Sport - Gamma V3 Twin Turbogized
DIY Gamma V3 TT Install * Jayhovah's Gamma V3 TT Install Pic'Z and Vid'Z * DIY: Washer Reservoir for the Boosted
Quote:
Originally Posted by redondoaveb
You've got a twin turbo sound system, I think you met your audio goals.
Jayhovah is offline   Reply With Quote
Old 03-31-2018, 10:18 AM   #19 (permalink)
A True Z Fanatic
 
Hotrodz's Avatar
 
Join Date: Aug 2012
Location: NW, AZ
Posts: 9,330
Drives: 10 Nissan 370z Nismo
Rep Power: 2684385
Hotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond repute
Default

Quote:
Originally Posted by BOLIO 671 View Post
Anybody able to chime in on this ^^^^^
The difference is the 2.5" will spool faster and torque will come on strong due to the back pressure in the 2.5" exhaust. With the 3" you will see higher whp numbers and your tuner should be able to control the torque better which allows for the increase in top end. Spool not really a factor unless you are using a large turbo from what I can tell on our cars.
__________________
Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:|Fast Intentions 3" TT-TDX|SpecialtyZ/Fast Intentions 72 Row Oil Cooler|SZ 6 Puck Clutch & Flywheel|3GsCustoms|Z1|Wavetrac|Hotchkis|Whiteline |Blitz|Fortune Auto 500|Fujimura|SPL|H&R|TK|TWM|RPM Rollbar|Sparco|Next Level Performance|TrackSpec|AeroFlow Dynamics|Pioneer|
Hotrodz is offline   Reply With Quote
Old 04-05-2018, 09:50 AM   #20 (permalink)
Premium Member
 
Jayhovah's Avatar
 
Join Date: May 2013
Location: St. Pete, FL
Posts: 3,848
Drives: 520whp Fire Breather
Rep Power: 86951
Jayhovah has a reputation beyond reputeJayhovah has a reputation beyond reputeJayhovah has a reputation beyond reputeJayhovah has a reputation beyond reputeJayhovah has a reputation beyond reputeJayhovah has a reputation beyond reputeJayhovah has a reputation beyond reputeJayhovah has a reputation beyond reputeJayhovah has a reputation beyond reputeJayhovah has a reputation beyond reputeJayhovah has a reputation beyond repute
Default

Quote:
Originally Posted by Hotrodz View Post
The difference is the 2.5" will spool faster and torque will come on strong due to the back pressure in the 2.5" exhaust. With the 3" you will see higher whp numbers and your tuner should be able to control the torque better which allows for the increase in top end. Spool not really a factor unless you are using a large turbo from what I can tell on our cars.
I disagree with this. There is no benefit to downsizing the exhaust for scavenging on a turbo motor, and it will only harm spool speed. You want to maximize the pressure differential across the the turbo to speed up the spool.. back pressure behind the turbo will only reduce spool, flow, and require more boost to make power.

For the 2.5" vs 3" exhaust question, its really just a question of diminishing returns.... It doesn't appear to me (and I haven't really looked at it with much scrutiny so I could certainly be wrong) that the 3" is going to do a whole lot more for you in a modest 500whp type of build.
__________________
2013 Gun Metallic Sport - Gamma V3 Twin Turbogized
DIY Gamma V3 TT Install * Jayhovah's Gamma V3 TT Install Pic'Z and Vid'Z * DIY: Washer Reservoir for the Boosted
Quote:
Originally Posted by redondoaveb
You've got a twin turbo sound system, I think you met your audio goals.
Jayhovah is offline   Reply With Quote
Old 04-05-2018, 10:39 AM   #21 (permalink)
A True Z Fanatic
 
Hotrodz's Avatar
 
Join Date: Aug 2012
Location: NW, AZ
Posts: 9,330
Drives: 10 Nissan 370z Nismo
Rep Power: 2684385
Hotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond reputeHotrodz has a reputation beyond repute
Default

Quote:
Originally Posted by Jayhovah View Post
I disagree with this. There is no benefit to downsizing the exhaust for scavenging on a turbo motor, and it will only harm spool speed. You want to maximize the pressure differential across the the turbo to speed up the spool.. back pressure behind the turbo will only reduce spool, flow, and require more boost to make power.

For the 2.5" vs 3" exhaust question, its really just a question of diminishing returns.... It doesn't appear to me (and I haven't really looked at it with much scrutiny so I could certainly be wrong) that the 3" is going to do a whole lot more for you in a modest 500whp type of build.
I don't disagree with what you are saying as I think we are saying the same thing but you provided the long and more detailed answer. Ultimately the 3" will out perform the 2.5" due to scavenging and the reasons you pointed out, however I have not seen much difference on power, spool or any other performance points on a non-built motor. The 2.5" will produce good numbers up until about 635whp or so before the tq becomes to much and as you stated it will be a question of diminishing returns on a 2.5" if you want big power. As far my comment on spooling faster or more aggressively, that is due to back pressure if I am mistaken then I have been edumicated!
VQStryker likes this.
__________________
Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:|Fast Intentions 3" TT-TDX|SpecialtyZ/Fast Intentions 72 Row Oil Cooler|SZ 6 Puck Clutch & Flywheel|3GsCustoms|Z1|Wavetrac|Hotchkis|Whiteline |Blitz|Fortune Auto 500|Fujimura|SPL|H&R|TK|TWM|RPM Rollbar|Sparco|Next Level Performance|TrackSpec|AeroFlow Dynamics|Pioneer|
Hotrodz is offline   Reply With Quote
Old 04-05-2018, 01:28 PM   #22 (permalink)
Track Member
 
VQStryker's Avatar
 
Join Date: Jul 2011
Location: Texas
Age: 36
Posts: 659
Drives: :(
Rep Power: 15
VQStryker has a spectacular aura aboutVQStryker has a spectacular aura aboutVQStryker has a spectacular aura about
Default

Quote:
Originally Posted by ihiryu View Post
Sorry all, been really busy. Went to the dyno and did a very quick tune on it, and was not happy with the results.

I'm making a smidge under 400 right now, and I am positive this is an issue with the stock exhaust. With that being said, I've ordered a cheapo ebay exhaust for testing. I plan to cut this exhaust up if it's too loud to ad resonators lol.

Also, this was only ignition timing and fuel done, I think if I spent more time with the VVEL and VTC, I'd definitely would pick up power. I did run after run with only breaks from flashing the maps on it lol.
6 psi isn't enough to gain much power even after a tune. I had the same thing with my first Z until i put it at 9 psi but even then, 9 psi isn't THAT much in the grand scheme of things. As for the exhaust, your stock nismo exhaust is sitting relatively close to 2.5" so if you dont use the catalytic converters and put on some muffler deletes, i feel you would render about the same results as getting a full exhaust.

With that being said, i would recommend 3" of pleasure to your fun meter. You can hear the turbo's (especially on cold start), sounds better and you will gain a little more from it v.s. a 2.5" exhaust but do not expect anything drastic.
__________________
SOLD- Stryker TT super sleeper (12.35 @ 121mph) no gripZ No Z
VQStryker is offline   Reply With Quote
Old 04-05-2018, 03:07 PM   #23 (permalink)
The370Z.com Sponsor
 
Boosted Performance's Avatar
 
Join Date: Feb 2010
Location: Edmonton, AB
Posts: 1,629
Drives: Z's
Rep Power: 3382
Boosted Performance has a reputation beyond reputeBoosted Performance has a reputation beyond reputeBoosted Performance has a reputation beyond reputeBoosted Performance has a reputation beyond reputeBoosted Performance has a reputation beyond reputeBoosted Performance has a reputation beyond reputeBoosted Performance has a reputation beyond reputeBoosted Performance has a reputation beyond reputeBoosted Performance has a reputation beyond reputeBoosted Performance has a reputation beyond reputeBoosted Performance has a reputation beyond repute
Default

The Nismo dual exhaust (piping) will outflow a single 3" exhaust by about 15% due to greater cross sectional area. A single 3" exhaust will support 600whp.

However, it is not just the pipe diameter that you guys need to consider. The rear muffle is more than likely baffled a fair bit in order to generate a certain tone, and flow which was purposefully engineered by Nissan

There is mention of scavenging, which does not apply in this case at all. Scavenging refers to one exhaust pulse pulling exhaust gasses from the next combustions cycle chamber. This can only be achieved with the use of OEM, or aftermarket equal length headers.

With turbo applications it is a very simple rule, as the principal of operations is primarily based on pressure differentials. The turbo will spool faster if the pressure differential between inlet and outlet is greater, hence the benefit of a larger downpipe. The pre turbine pressure (depending on the kit/turbo/turbine) can easily be double the boost pressure. So if you are at 12 psi boost, your pre turbine exhaust pressure could be 25psi. If you exhaust (post turbine) builds up a resistance of 5 psi, that is a loss of efficiency.

So with a turbo system, bigger exhaust is ALWAYS better.
__________________
750WHP starting @ $7,500 to the door
FOR DETAILS VISIT: http://www.the370z.com/members/boosted-performance.html
FB: https://www.facebook.com/Boosted-Per...6303179791462/
IG @boostedperformanceyeg
Boosted Performance is offline   Reply With Quote
Old 04-09-2018, 02:36 PM   #24 (permalink)
Base Member
 
Join Date: Oct 2016
Location: TX
Posts: 141
Drives: 2013 Nismo 370z 6MT
Rep Power: 34
ihiryu has a reputation beyond reputeihiryu has a reputation beyond reputeihiryu has a reputation beyond reputeihiryu has a reputation beyond reputeihiryu has a reputation beyond reputeihiryu has a reputation beyond reputeihiryu has a reputation beyond reputeihiryu has a reputation beyond reputeihiryu has a reputation beyond reputeihiryu has a reputation beyond reputeihiryu has a reputation beyond repute
Default

Hey all, just wanted to update,I haven't been ablet o make it to the dyno yet. I've gotten most of my parts for the methanol, just need time to get it all together. My plans are to get it on the dyno and to leave it as is, and see what my pre-meth numbers are. Hoping to get on the rollers this weekend.
ihiryu is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
[FOR SALE] fast intentions carbon fiber cans 1 nismo front wheel and stock intake manifold nismo shayandude Parts for sale (Private Classifieds) 17 12-24-2015 05:23 AM
[WTB] Looking for stock Nismo/40th Shiftknob for stock parts Footloose301 Parts for sale (Private Classifieds) 5 02-21-2014 03:11 PM
[FOR SALE] Stock Nismo Sway Bars and Stock Nismo Tokico shocks with H&R Lowering Springs BrooklynBully Parts for sale (Private Classifieds) 14 09-17-2013 01:14 PM
[FOR SALE] 2012 Nismo stock springs and stock exhaust Justlooking Parts for sale (Private Classifieds) 6 03-07-2013 05:36 PM
LTB: Stock Nismo Exhaust off a Nismo whos upgrading chuckd05 Parts for sale (Private Classifieds) 5 12-03-2009 09:53 PM


All times are GMT -5. The time now is 02:28 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 PL2