sr20det dyno chart, whatcha think?

[240jake]

So im pretty proud of these numbers considering its a stock s13 sr20det ECU with ebay fmic/exhaust and an s15 bb gt2560r turbo @14-15lbs.

https://lh3.googleusercontent.com/-lgiDikI7U1U/UJ0irUwUA7I/AAAAAAAAAxo/y-AfZaRfFWU/s1024/s14sr20%2520dyno%2520chart.jpg

[ben88]

Is that a single gear pull?

[future]

Wait. Your 2.0 sr makes more tq then hp!?

[Def]

Stock injectors and MAF?

Yep, that engine isn't long for this world...

[240jake]

yeap stock injectors and MAF, the dyno pull was at around 5000 ft elevation and i do have an aem wideband, my afrs are legit due to the altitude.

[240jake]

Is that a single gear pull?

Yes its a 4th gear pull.

[240jake]

Wait. Your 2.0 sr makes more tq then hp!?

yes it does, the beauty of the s15 bb turbo!

[Def]

yeap stock injectors and MAF, the dyno pull was at around 5000 ft elevation and i do have an aem wideband, my afrs are legit due to the altitude.

Yea, because AFRs are the only thing that keep your engine from exploding. Your ignition timing ramps up too high due to you being way off the edge of the map.

Your AFRs look like crap anyway...

[240jake]

the afrs from the dyno chart are not correct, obviously they are off the charts and my motor woulda sploded.
the wideband readings from the aem are even a bit rich still all the way to the top.

elevation has alot to do with not running out of mafs and injectors.

[240jake]

ps, the numbers are the corrected for altitude numbers as well :) at sea level i would have run out of air/fuel by then.

[kojiki88]

Who tuned your car?

This is from my tune. S15 T28 Turbo, 740cc Injectors, Z32 MAF, At 17PSI and the AFR where at 11.8
http://i289.photobucket.com/albums/ll219/driftereighty/Bladmir240sx305.jpg

[240jake]

nice, looks like the Motiva dyno, thats where my numbers came from, im on the stock ecu, injectors, maf and the graph i posted IS the corrected for alt graph, is yours the uncorrected?

[Rays_240]

Good numbers. my stock sr with a s15 turbo made 310hp and 300tq. But I had 555cc injector and a z32 maf
http://i282.photobucket.com/albums/kk265/l2aymond/283790_596177329362_58199926_n.jpg

[jr_ss]

Anyone with an S15 turbo should have upgraded fuel and air metering components to support it... Not having them is asking for trouble, regardless of elevation.

[kojiki88]

Good numbers. my stock sr with a s15 turbo made 310hp and 300tq. But I had 555cc injector and a z32 maf
http://i282.photobucket.com/albums/kk265/l2aymond/283790_596177329362_58199926_n.jpg

I'm also running Nismotronic on my ECU. How much boost were you running to achieve 310 hp and 300tq?

240jake: That was the final run after doing numerous adjustments. And yes that was at the Motiva Dyno.

[Rays_240]

I was on 17psi, w/ stock motor.

[kojiki88]

Very Nice..

[guitaraholic]

Correct me if I am wrong, but if you are at 5000 feet, and the dyno corrects it for altitude, it would make the readings a bit generous (for a turbo application). Let me explain.

- A naturally aspirated engine is directly effected by the altitude. If you have half the air, you got pretty close to half the horsepower.


-----Example - You have a 400HP V8 at sea level. Now at sea level your standard pressure is 29.92". At 5000 feet the average pressure is 24.90. So you have 83% of the air available, and theoretically 83% of the horsepower or 332HP. The correction factor would "give you" the extra. 68HP/17% to equal 400HP again.

----- Now look a turbo engine. These are not nearly as effected by altitude. If per say you make 300HP at 17psi at sea level. Sea level altitude is 14.7psi. Add them together, you are getting 31psi "worth" of air at the manifold. Now take the same car at 5000 MSL. Turbo is still making 17psi, but ambient air is now 12.23psi. You still lose 17% of your pressure (24.90"/12.23psi), but you are adding 17psi with the turbo. So with 17lbs of boost, you are still getting 29.23psi worth of air at the manifold. so, you are at 94% of the air you had at sea level, so you should in a since have 94% of the power (yes, its a little rough).

However, the dyno is still compensating for a 17% loss, not a 6% loss. So if per say the dyno at 5000 feet read 282hp, it would actually correct it to add 17% giving you a readout of 330hp.

If you took the same numbers and applied them to your dyno of 283hp. It would look like the following

- 283HP - 17% = 234.89HP (what the actual dyno read),

- Now use the correction method above (adding 6%) you get

- 234.89HP + 6% = 249HP.. I think that is closer to realistic.

[240jake]

guitaraholic (http://zilvia.net/f/members/guitaraholic.html) you are right on sir, this is why im not running out of injectors/ maf @altitude up here at 5k+ ft. the car does feel like a closer to 250whp car right now as well.

thanks for the awesome breakdown!

[steve shadows]

Yea, because AFRs are the only thing that keep your engine from exploding. Your ignition timing ramps up too high due to you being way off the edge of the map.

Your AFRs look like crap anyway...

Ditto...pretty much.

Numbers are ok, looks like dyna-pack or dyno jet? or MS paint graph?

Matches up to your setup but the read out for AFR could be neater and definitely displayed better at the very least.

We're doing these numbers with these turbos on Dyno Dynamics dynos though...which read about 15% lower than dyna-packs and dyno jets. Sometimes even less than that...shameless plug