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View Full Version : First dyno, S13 redtop autocross motor

Gearhead_42
04-21-2007, 02:10 PM
I had my first opportunity to dyno my Nissan today! I'm excited, can you tell? :D

http://i52.photobucket.com/albums/g3/Gearhead_42/DynoGraph001.jpg

I was extremely pleased with the output of the SR, considering I've done very little to it. After some discussions with the dyno operator, we came up with a few ideas for improvements. First thing I need to do is to get some fuel out of it, hopefully just by reducing the base pressure on the boost coupled regulator... after that, I need a bigger turbo! Doesn't everybody say that? My boost is falling off right with the torque curve, poor little T25 just can't flow enough to feed a 7500 rpm 2-litre... After the first couple runs, I just started getting out of it at around 7k, no reason to keep pushing to redline.

Wanted to share, and invite criticism/comments! Keep in mind, this is an autocross car, fat low-mid torque is what I want out of it...


Oh, the setup: Internally stock redtop SR20DET, FMIC, Blitz BOV, Apexi cone intake; stock T25 turbo, TurboXS manual boost controller set to 13 psi, divided flow elbow, 3" straight through exhaust; Koyo rad, Altima e-fans, removed mech fan and lightened pulleys. Running 92 octane pump gas and Mobil1 15w50, 3rd gear pull...
koukimonster139
04-21-2007, 02:36 PM
cool.

id be pleased too if my engine made almost the exact power claimed by the manufacturer.
Gearhead_42
04-21-2007, 02:50 PM
Umm... This was rated at 200 or 202 (I forget exactly) at the crank, right? It made 20 more than that to the wheels... so with only 10% losses that's 240 or so crank...
koukimonster139
04-21-2007, 02:55 PM
pardon me. i meant

id be pleased too if my engine made not a lot of power.
GSXRJJordan
04-21-2007, 03:15 PM
lol Koukimonster ~

That's a solid number for your stock setup, that's good. The fuel looks alright, is that on stock ECU with no AFC/etc? You could lean it out a tiny bit, but 11.5 is a solid AFR for full throttle on the boost.

The motor's ready for more air sir... :)
Gearhead_42
04-21-2007, 03:34 PM
lol Koukimonster ~

That's a solid number for your stock setup, that's good. The fuel looks alright, is that on stock ECU with no AFC/etc? You could lean it out a tiny bit, but 11.5 is a solid AFR for full throttle on the boost.

The motor's ready for more air sir... :)

Thanx jordan

Yep, stock ecu and FPR, no AFC or other fuel control. My current thinking is to install the Nismo FPR and pull the base pressure back from the [email protected] to around 35, and see where I am.

I hear you on "more air", maybe in next years budget :naughtyd: