Torque numbers - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

boost addict · 12-09-2012, 02:16 PM

So I had a huge difference in my torque numbers when I switched setups and I think it's pretty weird. My last setup on my sr was a t2 glange 3071r .82ar internally gated and made 430/365 at 22psi. Now I have a precision 5558 .63 ar external gate and switched to a t3 flange and it made 420/280ish at 17psi. Anyone know why there was such a huge drop in torque?

EDacIouSX · 12-09-2012, 02:18 PM

my guess and it's only a GUESS would be because it's a lower pressure which might mean lower air velocity. I am assuming the 5558 is a bigger turbo so its pushing more volume at a slower air speed into the chambers.

*fliprayzin240sx* · 12-09-2012, 02:28 PM

Tuning.......

boost addict · 12-09-2012, 04:08 PM

Both setups tuned on nistune at ill garage, idk after I change up some things im taking it back and I'll see what happens. The 5558 is just a little larger but the biggest difference between the two turbos is the turbine housing

EDacIouSX · 12-09-2012, 06:13 PM

you should ask if they changed the timing at all

Rays_240 · 12-09-2012, 06:35 PM

I have seen this happen alot with the perssion turbos. not really sure why...

Croustibat · 12-10-2012, 03:28 AM

Pressure acts like a displacement multiplier, and torque depends on displacement. Assuming mapping is done correctly, your difference is there. Power being torque x rpm, it just means your new setup produces less torque, but keeps producing it higher in the revs, while your previous setup did produce low down torque and then fell over at higher revs.

silver04rsx · 12-10-2012, 03:46 AM

^Dyno to prove the mans logic?

EDacIouSX · 12-10-2012, 04:13 AM

Quote:

Originally Posted by silver04rsx

^Dyno to prove the mans logic?

well all torque curves meet hp curves at what.. 5250 rpm? 5750? so what he is saying makes sense.

boost addict · 12-10-2012, 01:26 PM

The new setup spoils quicker an makes power faster than my last once which was pretty laggy. Both setups kept making power at redline and would've kept going so neither ran out of power. So techinically it would make torque lowers as well right? The pressure point makes sense though, maybe I'll also bump it up a few psi and see what happens

Kingtal0n · 12-10-2012, 03:13 PM

dyno sheets so we can nit pick. giving xxx/xxx numbers is like saying my car was white but now its pink, what happened?

12-09-2012, 02:16 PM	#1
boost addict Zilvia Addict Join Date: Nov 2010 Location: Northwest Indiana Age: 32 Posts: 859 Trader Rating: (12) Feedback Score: 12 reviews	Torque numbers So I had a huge difference in my torque numbers when I switched setups and I think it's pretty weird. My last setup on my sr was a t2 glange 3071r .82ar internally gated and made 430/365 at 22psi. Now I have a precision 5558 .63 ar external gate and switched to a t3 flange and it made 420/280ish at 17psi. Anyone know why there was such a huge drop in torque?

12-09-2012, 02:28 PM	#3
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	Tuning....... __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

12-10-2012, 03:46 AM	#8
silver04rsx Leaky Injector Join Date: Jun 2007 Location: Charlotte, NC Age: 36 Posts: 100 Trader Rating: (5) Feedback Score: 5 reviews	^Dyno to prove the mans logic? __________________ -Briggs, s13 vert drifting Lucy, s14 zenki Lois the DD

12-10-2012, 03:13 PM	#11
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 42 Posts: 4,829 Trader Rating: (17) Feedback Score: 17 reviews	dyno sheets so we can nit pick. giving xxx/xxx numbers is like saying my car was white but now its pink, what happened? __________________ 5.3/4l80e/turbo 240sx playthrough: tinyurl.com/4l80er

12-09-2012, 02:18 PM	#2
EDacIouSX Post Whore! Join Date: Nov 2004 Location: Los Angeles Age: 39 Posts: 4,566 Trader Rating: (53) Rides Gallery: EDacIouSX Feedback Score: 53 reviews	my guess and it's only a GUESS would be because it's a lower pressure which might mean lower air velocity. I am assuming the 5558 is a bigger turbo so its pushing more volume at a slower air speed into the chambers.

12-09-2012, 04:08 PM	#4
boost addict Zilvia Addict Join Date: Nov 2010 Location: Northwest Indiana Age: 32 Posts: 859 Trader Rating: (12) Feedback Score: 12 reviews	Both setups tuned on nistune at ill garage, idk after I change up some things im taking it back and I'll see what happens. The 5558 is just a little larger but the biggest difference between the two turbos is the turbine housing

12-09-2012, 06:13 PM	#5
EDacIouSX Post Whore! Join Date: Nov 2004 Location: Los Angeles Age: 39 Posts: 4,566 Trader Rating: (53) Rides Gallery: EDacIouSX Feedback Score: 53 reviews	you should ask if they changed the timing at all

12-09-2012, 06:35 PM	#6
Rays_240 Zilvia Member Join Date: Jul 2011 Location: Maryland Age: 35 Posts: 164 Trader Rating: (6) Feedback Score: 6 reviews	I have seen this happen alot with the perssion turbos. not really sure why...

12-10-2012, 03:28 AM	#7
Croustibat Nissanaholic! Join Date: Aug 2011 Location: France - Toulouse Age: 44 Posts: 1,851 Trader Rating: (0) Feedback Score: 0 reviews	Pressure acts like a displacement multiplier, and torque depends on displacement. Assuming mapping is done correctly, your difference is there. Power being torque x rpm, it just means your new setup produces less torque, but keeps producing it higher in the revs, while your previous setup did produce low down torque and then fell over at higher revs.

12-10-2012, 01:26 PM	#10
boost addict Zilvia Addict Join Date: Nov 2010 Location: Northwest Indiana Age: 32 Posts: 859 Trader Rating: (12) Feedback Score: 12 reviews	The new setup spoils quicker an makes power faster than my last once which was pretty laggy. Both setups kept making power at redline and would've kept going so neither ran out of power. So techinically it would make torque lowers as well right? The pressure point makes sense though, maybe I'll also bump it up a few psi and see what happens