SR20 Performance

[msommers]

Otto,

Was that the first dyno run you've done with the installed parts or did you do one before that? Reason I ask is because when I took my car in, I had for the most part, a stock car with an RB in it and it made shit numbers, like completely disappointing..I think 150whp or something. Upgraded the exhaust and threw on a test pipe...went to go test out some an ECU and some chips...the stock one, I was around 210whp. Taking the cat out made a ridonkulous difference!

Just curious if you able to compare that beforehand or not.

[ottamania]

Originally posted by msommers
Otto,

Was that the first dyno run you've done with the installed parts or did you do one before that? Reason I ask is because when I took my car in, I had for the most part, a stock car with an RB in it and it made shit numbers, like completely disappointing..I think 150whp or something. Upgraded the exhaust and threw on a test pipe...went to go test out some an ECU and some chips...the stock one, I was around 210whp. Taking the cat out made a ridonkulous difference!

Just curious if you able to compare that beforehand or not.

Yes, this was my first dyno run with the installed parts. whatever is not on the installed list is stock including the cat and the ecu. I wanted to do a dyno bone stock but, didnt do it. As for whp, i was expecting somewhere around 180 but still 177 is pretty darn close to that. Its also runing rich a bit since there is wallbro 255.

[Genjuro]

Red SR20 in 97 Kouki
Megan turbo manifold
GT2871R .86
3" flex pipe
Apexi Dual N1
Greddy fmic w/ 2'' hot+cold piping
HKS Bov
RB25 MAF
Z32 fuel filter
650cc Deatschwerks
Walbro 255 fuel pump
piggyback rom tune on SR ECU
stage3 fidanza aluminum clutch kit
stock 7psi...

[sr20s14zenki]

Where did you dyno otto? was it a dynojet or was it a mustang dyno.

[ottamania]

Originally posted by sr20s14zenki
Where did you dyno otto? was it a dynojet or was it a mustang dyno.

it was a dynojet @ davenport

[msommers]

165whp on a dynojet?? Hmm...

[sr20s14zenki]

^ yah even factoring in drivetrain loss, that seems a bit low......


edit: well, at stock boost i guess not. I managed to get 13.7 in the quarter at 13 psi from the stock turbo on my s13 sr20 in my s14. I was running greddy front mount, 3.75" HKS Hi power exhaust, and the 13 psi with a manual boost controller. Turning up the boost really wakes these engines up, and that where youll see your biggest gain, provided you do it safely (=

[ottamania]

Originally posted by msommers
165whp on a dynojet?? Hmm...

165 hp with 177 tq

[Cooked Rice]

I made 143 WHP on my KA when it was N/A with turbo cams. On a land/sea dyno, which is comparable to a mustang. People say it's more heavily loaded than a mustang.

[peterparker]

its supposed to be more accurate than a mustang dyno...

[sr20s14zenki]

The reason mustang dynos are lower in numbers, is because they simulate load like a road would. AFAIK, and this could be only the old Dynojets, they do not load the rollers. So you would read even lower on a mustang dyno haha.

to give a good comparison, my buddy's sr20 made 265 at the wheels with a t3/t4 and 550cc injectors at 12 psi. That was on toma's mustang dyno.

[msommers]

Originally posted by sr20s14zenki
13 psi with a manual boost controller.

Good ol manual boost controllers, best dollar vs. power out there!

[ottamania]

graph is up

[-KiTtY- boo]

SR20DET Redtop
FMIC kit
M-R 3" downpipe
M-R 3" Test Pipe
Apexi EVO N1 Exhaust
GT2871R
Z32 Maf
Apexi Power FC
SARD 800cc Top feed injectors
SARD Top Feed fuel Rail
M-R Exhaust Manifold
M-R Coilovers
Ku Intake Manifold
Ku 3" Throttle body
Z32 brake conversion

[-KiTtY- boo]

Originally posted by sr20s14zenki
The reason mustang dynos are lower in numbers, is because they simulate load like a road would. AFAIK, and this could be only the old Dynojets, they do not load the rollers. So you would read even lower on a mustang dyno haha.

with just FMIC, and full exhaust i pulled 208rwhp on tomas mustang dyno stock boost

[sr20s14zenki]

Originally posted by -KiTtY- boo


with just FMIC, and full exhaust i pulled 208rwhp on tomas mustang dyno stock boost

Yah that sounds about right. Was your boost creeping or was it relatively stable? With an open exhaust you get a bit more response and a bit more pressure as well. The sr20 is rated at 200 hp at the crank stock, so fmic and exhaust adding 20 hp is about right, factoring in drivetrain loss. I read in a book however, and i cant remember which book, but it basically stated that drivetrain loss isnt what its widely accepted to be. They say its like 15%, in reality its more like 5% tops, but like i say, i cant remember where i read it. I remember when i brought my rx7 turbo II into davenport haha. I made 215 hp and 205 ft/lb of torque out of that little bastard. Only mods were 3" exhaust and s5 turbo, and 720cc secondaries. The rest was bone stock. That wasnt bad at all....and they use a dynojet.


Maybe ill chuck mine on the dyno this year depending on setup. I will be running 550cc, z32 maf, and charlies tune on my ecu with a 2860rs, fmic, HKS exhaust, greddy profec b boost controller, stock rad, stock block MAYBE.


Edit: In your quote kittyboo, it says 13.5@ 106 mph. Is that with your current setup? Were you having traction issues? can you remember what your 60' was? Reason i ask, is on stock turbo i was getting 13.7@101 MPH with a 2.017 60'. When i put 2860rs in at 10 psi, i was getting 13.8@ 106 mph, with a 2.371 60' as far as i remember, i would have to dig my slips out.

[sr20s14zenki]

Well, due to debt being more important than car this year, ive decided to throw together another stock sr20det and see how it goes this season with a PROPER tune. I bought a block and head from jdmsource for 400$, it lost a keeper on the first two intake valves, so im guessing bent valves. so i will pull off the head, replace the valves and all the valve seals, and re-install. The bottom end looks ok, a bit sludgy, but we'll see, the price was right. Next year will be build year. See y'all at the track, rocking a stock bottom end, hopefully making 350 horsepower (=

[silviak91]

My sr20 was 248 whp but ran out of fuel on a mustang Dyno i ran 13.3 at 108 with a bad 60ft of 2.6 . That was with my Silvia with a sr20det now it has a rb25det but not going to race it this year because i just got a 180 sx with a sr20 and been putting all my old stuff on it 2 more weeks and it is on the road.

[AutodreamMarvin]

Originally posted by sr20s14zenki
Yah that sounds about right. Was your boost creeping or was it relatively stable?

From what I recall it was very stable. Not sure what the boost setting was. From what I recall it was at 8psi. Anything beyond that and there was audible detonation.

The Autodream EPROM that she was running was optimized for stock to slightly raised boost. (advanced ignition, and slight fuel trim in the mid range and slightly richer near the top end)

With an open exhaust you get a bit more response and a bit more pressure as well. The sr20 is rated at 200 hp at the crank stock, so fmic and exhaust adding 20 hp is about right, factoring in drivetrain loss. I read in a book however, and i cant remember which book, but it basically stated that drivetrain loss isnt what its widely accepted to be. They say its like 15%, in reality its more like 5% tops, but like i say, i cant remember where i read it.

From what I remember, its as the power increases, the drivetrain loss as a percentage decreases. I believe it has something to do with overcoming thedrag from the drivetrain. there is a given amount needed to overcome the drag, and a the loss thereafter is taken as a percentage.

This was very hazy in my memory, but from my recollection it was something like that.

I remember when i brought my rx7 turbo II into davenport haha. I made 215 hp and 205 ft/lb of torque out of that little bastard. Only mods were 3" exhaust and s5 turbo, and 720cc secondaries. The rest was bone stock. That wasnt bad at all....and they use a dynojet.

Turbo II's are notorious for responding well to exhaust modifications.

Racing Beat claims 60 extra HP from their exhaust system alone. They're pretty quiet to boot.

I should've ran this on my S5.

Maybe ill chuck mine on the dyno this year depending on setup. I will be running 550cc, z32 maf, and charlies tune on my ecu with a 2860rs, fmic, HKS exhaust, greddy profec b boost controller, stock rad, stock block MAYBE.

Try one of Nguyen's tunes. He's done about 20-30 similar setups. See which one you like better.

He's got an emulator and dyno, so it can be personalized to your setup, and the safety that you want to add in.

Edit: In your quote kittyboo, it says 13.5@ 106 mph. Is that with your current setup? Were you having traction issues? can you remember what your 60' was? Reason i ask, is on stock turbo i was getting 13.7@101 MPH with a 2.017 60'. When i put 2860rs in at 10 psi, i was getting 13.8@ 106 mph, with a 2.371 60' as far as i remember, i would have to dig my slips out.

It wasn't fully tuned and i'm not sure that she was used to the setup. Watch out this year though. Christine seems to exponentially get better with practice.

On a side note:

It seems like S14 guys getter much better times than S13.

The only guy that is the contrary is Matt.

Any S13 guys out there want to show that they are tops?

[-KiTtY- boo]

Originally posted by sr20s14zenki
Edit: In your quote kittyboo, it says 13.5@ 106 mph. Is that with your current setup? Were you having traction issues? can you remember what your 60' was? Reason i ask, is on stock turbo i was getting 13.7@101 MPH with a 2.017 60'. When i put 2860rs in at 10 psi, i was getting 13.8@ 106 mph, with a 2.371 60' as far as i remember, i would have to dig my slips out.

Originally posted by AutodreamMarvin
It wasn't fully tuned and i'm not sure that she was used to the setup. Watch out this year though. Christine seems to exponentially get better with practice.

13.5@ 106 was on the new set up. That was from two summers ago, its was the last day at racecity and i had just gotten all that in about a week before. I was super desperate to get on the track just to see what i could do on the new setup. So Marvin is right, i wasnt used to the setup at all, and it wasnt tuned at all. Ngueyen was able to do as much as he could using the EPROM so that it was aleast driveable. But it obviously needed a fuel computer system.
I believe my 60' was something really shitty like 2.3 or 2.4, the car was running extremly rich, and it was only hitting 7lbs of boost. But i didnt have any traction issues.