WRX on the dyno tomorrow

TortoiseAWD · 12-02-05, 05:16

I'm headed to KC for some dyno tuning tomorrow . . . stay tuned for before/after dyno graphs.

Current engine mods:
Turbo-back 3" exhaust
STi injectors
VF-34 turbo
Cobb StreetTuner running "off-the-shelf" map

The standard ECU map that Cobb supplies for my modifications is supposed to make around 320hp at the crank (estimated based on whp + AWD drivetrain losses). Of course, this will vary as every car is slightly different. The Cobb-supplied maps are relatively conservative, and I haven't done any tweaking on my own. I'm hoping that the tuner will be able to pick up at least 20 hp and some torque to go with it.

I'll try to post up the dyno results tomorrow afternoon.

Tort

Neothin · 12-02-05, 05:28

Eh, You should've gone for an 18G/20G. A buddy of mine has a bugeye 03 and he first went with a VF-34 setup. It didn't provide the power that he was looking for. He eventually switched to a 20G (and later a GT35R). The way he said it was something like, you can only tune so high on a smaller turbo while you can detune a large turbo and achieve the same result while still having the capability to go crazy later. I would guess that you went this route because the access port is a plug and play item. he went with a full emanage setup so he didn't really have to stick to certain mods like you do with the cobb item. I suppose for the ease of use and install with the cobb item, its good for most people though. I wish you luck!

TortoiseAWD · 12-02-05, 05:57

Well, I went with the VF-34 for a couple of reasons, one of which was the availability of the Cobb map. I'm not looking for all-out horsepower, I want some low-end grunt as well, and that means sticking with a turbo that will spool at a reasonable RPM. I was looking for a good compromise between more hp and as little lag as possible. All things considered, I think I ended up with the right turbo for what I wanted out of the car. For now, anyway.

Tort

Neothin · 12-02-05, 08:35

Ya, chris (my friend) doesn't daily drive the car so he just went all out race with his setup. APR Stage 4 Block (but with darton sleeves), GT35R Turbo, STi 6-speed, cusco differentials, cams, large FMIC, etc etc. It has costed him alot, but I must say, a 450 AWHP launch is amazing. Ill be patiently waiting for your results

TortoiseAWD · 12-02-05, 09:20

Quote:

Originally Posted by Neothin

Ya, chris (my friend) doesn't daily drive the car so he just went all out race with his setup. APR Stage 4 Block (but with darton sleeves), GT35R Turbo, STi 6-speed, cusco differentials, cams, large FMIC, etc etc. It has costed him alot, but I must say, a 450 AWHP launch is amazing. Ill be patiently waiting for your results

Uh,

and

Nice mod list. Pretty much every else on the road is going to be a Scooby-snack for 0 - 60. Has he taken it to the track for 1/4 mile times yet? And, out of curiosity, is he set up for road race or straight line?

Yeah, my WRX is my daily driver, so reliability is a big issue for me. That, and the stock tranny will only deal with so much (I really envy your friend's 6-speed). Shorter, stronger gears are on my to-do list (probably this summer), but I don't think I'll be able to justify the $$$ for the STi 6-speed. Hmmm. I gotta go buy a (winning) lottery ticket . . .

Tort

G35stilez · 12-02-05, 10:09

Are you considering the 40t turbo?

With the mod list you have, I would hope for high 2's. Good luck and take a video

.

DARKSTI · 12-02-05, 11:04

nice, be sure to post the numbers

Neothin · 12-02-05, 04:29

the last time he went to the track he got a 12.1, but that was with the 20g and stock engine. He hasn't gone to moroso since he changed the turbo and the block. His suspension is stock except for some tein springs and needless to say it's hard to get the car to go forward correctly with his power on a relatively stock suspension setup. He wants to get into road racing at moroso, sebring, etc but personally i think his turbo is too laggy for that. It isnt fully spooled until almost 4k, but he won't hear any of it from me. he also can drive worth anything. There's a section of winding roads to get to my house and I've outpaced him in my tC. His next rounds of upgrades are going to be coilovers, sways, strut bars, and underbody bracing. Then a roll cage. He says after that he'll be done, but i doubt that, especially considering i showed him the godspeed turbo kits.

Neothin · 12-03-05, 03:31

Tort, how did the dyno go?

TortoiseAWD · 12-05-05, 05:55

Quote:

Originally Posted by Neothin

Tort, how did the dyno go?

A little disappointing, to be honest . . . the baseline run showed some lean spots, and the AFR was all over the place (not a very smooth curve). The tuner ended up spending time making the map safer rather than trying to gain more power. As this was part of a club "dyno day", I was only able to get about an hour of tuning time.

I've posted the graph of the final run below. The hp numbers are about the same as before the tune, but the AFR line looks a lot more reasonable now. 243 hp, 215 ft-lb:

The numbers are pretty much in line with what Cobb says the map should make (adjusting for the difference between Mustang and Dynojet dynos), so at least there doesn't appear to be anything seriously wrong. Assuming a 25% drivetrain loss, the numbers translate to a little more than 300 hp at the crank.

I've got a few pictures and a short vid that I'll post up when I get the camera back from my gf. The shop owns a Skyline GTR that they had been tuning the night before . . . it made 1028 hp. I have a few pictures of the Skyline's engine bay (and a severe case of turbo-envy).

Tort

G35stilez · 12-05-05, 06:40

Tort: I think the safer, smoother curve speaks higher volumes than just a high HP/TQ #. I'm sure the car feels much better now.

(anxiously waiting for the pics/vid)

SK2003TypeS · 12-05-05, 07:46

I agree, smoothness is a lot better than big #s. Especially if it's your daily driver.

Friend of mine use to have a 91 Mitsu GSX with all the HKS options available at that time and a few other toys. It was a really fun car until we blew a turbo. That was a sad night on the strip.