gt2871r on RB25DET? - Page 2 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Project "Rojo" s13 · 02-04-2010, 09:45 AM

a holset hx35 is another good match for the rb25. it spool fast and last long and has the potential to make big hp

kalypso123 · 02-04-2010, 10:03 AM

Use compressor maps of a 2871r, and CFM of the rb25 at each rpm. To calculate PSI along the power curve.

Once you know how much boost you're going to get. that can translate roughly into Horse power.

I can help you with this, if you need it... but garrets turbo 101 articles break it down.

jspaeth · 02-04-2010, 10:40 AM

Quote:

Originally Posted by kalypso123

Use compressor maps of a 2871r, and CFM of the rb25 at each rpm. To calculate PSI along the power curve.

Once you know how much boost you're going to get. that can translate roughly into Horse power.

I can help you with this, if you need it... but garrets turbo 101 articles break it down.

Bingo, I am glad someone said this.

However, as Cody mentioned above, the turbine side is also important to take into consideration, and the compressor map has nothing to do with this

rubhamusan · 02-04-2010, 11:19 AM

Quote:

Originally Posted by Darksun280

What do you concider alot of lag? what was it spooling that by? Anything that spools by 3500-3700 in 3rd is decent to me.

about 4k.I meen you could clutch slip and get the job done but it was just to big for the power that was wanted.400 was plenty.

Darksun280 · 02-04-2010, 01:18 PM

Quote:

Originally Posted by rubhamusan

about 4k.I meen you could clutch slip and get the job done but it was just to big for the power that was wanted.400 was plenty.

I hear ya. I had a 60-1 ceramic bearing on my mazdaspeed 3 which is almost the size of a 35R. It spooled by 3800 in 3rd gead 6speed on a 2.3 liter but still kinda sucked for merging into hihwgay traffic quickly. Especially since I was only making [email protected] it was over kill for so little power. What Psi does the 28r on a decent sized cam does the sr20 and RB start getting close to 400whp? I heard 2871's shouldn't be spun over 24psi continuously but then again that's hearsay. RB25 is a 2.5 liter right id think the 28 would be just on the small side.

codyace · 02-04-2010, 03:25 PM

Quote:

Originally Posted by kalypso123

Use compressor maps of a 2871r, and CFM of the rb25 at each rpm. To calculate PSI along the power curve.

Once you know how much boost you're going to get. that can translate roughly into Horse power.

I can help you with this, if you need it... but garrets turbo 101 articles break it down.

Squirrel Performance

Here is a great 'cheater' program for compressor maps/plots. It gets you in the ball park for sure

rubhamusan · 02-05-2010, 08:32 AM

About 18 psi was all it ran.So it was easy on the turbo.

02-04-2010, 09:45 AM	#31
Project "Rojo" s13 Leaky Injector Join Date: Dec 2007 Location: d-town Posts: 60 Trader Rating: (0) Feedback Score: 0 reviews	a holset hx35 is another good match for the rb25. it spool fast and last long and has the potential to make big hp __________________ Ricer: Any car which was designed to go slow and modified to even go slower

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02-04-2010, 10:03 AM	#32
kalypso123 (ノಠ益ಠ)ノ彡 Join Date: Apr 2008 Location: New York, NY Posts: 2,853 Trader Rating: (2) Feedback Score: 2 reviews	Use compressor maps of a 2871r, and CFM of the rb25 at each rpm. To calculate PSI along the power curve. Once you know how much boost you're going to get. that can translate roughly into Horse power. I can help you with this, if you need it... but garrets turbo 101 articles break it down.

02-05-2010, 08:32 AM	#37
rubhamusan Zilvia Member Join Date: Oct 2008 Location: Knoxville,TN Age: 49 Posts: 201 Trader Rating: (3) Feedback Score: 3 reviews	About 18 psi was all it ran.So it was easy on the turbo.