I edited as approriate...

oh my bad.. engine mods gotcha

new dyno numbers with TGV deletes
 

well after waiting a week here are my new dyno numbers with my TGV valves deleted. had a ported throttle body installed, but they had to go back to a stock one because it was flapping after letting off after WOT. pretty good increase for such a small mod. got +8hp and +15wtq. up to 280hp and 247tq(@17.5psi). also got a race gas map tuned for about 96 octane. ran 290hp and 258tq....only 10 hp and tq gain on race, but i think at 19.5psi my vf 34 is about out of air. no real difference in turbo spool up but the increases all around were very pleasing. car drives awesome and the power is very good. anyway thats the update and the attached overlays of my charts.

ryan

btw, mike W. told me that with 280hp my wrx is the highest they've dynoed with a vf 34...so im pretty happy about that. not bad for the pretty crappy usdm wrx block.

Mods: Cobb TBE + GT Spec headers + pro-tune
Wheel HP: 268.0 @ 5250 RPM
Wheel Torque: 303.0 @ 3750 RPM
Dyno: Mustang @ Gruppe-s 12-Nov-05

Hey Mike, I don't have any previous numbers for your STI. Got any baseline, or anything?

Those are real close to my numbers :huh:
I think Iwas at 268 and 299 :eek:
Mike are you catless?

Page 5 of this thread!

No, I have a cat

Hey Mike, who tuned your car at Gruppe-S and do you have a graph? You've got some sick torque for your setup.

Also, is it true that you always have to port the WG when you free up the exhaust on an STI?

Those were also really close to mine with similar mods. If I remember mine were also with the injen intake. I think mine was 269 and 310 (hiccup). I had no cats though. I'm starting to think the cats only take a couple horses at this point. What PSI are you running?

It was tuned by Mike Warfield at Gruppe-s on their indoor road dyno (username GST_Mike on this board) . Chart is below. I have a cat and custom tuning so I have never had a problem with boost creep.

I think 18 tapering to 13, or something like that.

When I was at cobb Trey told me that their cat cost around 5 Hp.

That's cool that you didn't have to have the WG ported. Congrats!

When I had my VF39, I didn't either and I was catless. I never had boost creep.

Cool. Why do some STI's "have to" have it ported?

non-ported wastegates can cause the boost creep issues on free-flowing exhausts. So, two ways to fix the problem. 1) Port the wastegate. 2) Tune around the boost creep.

Simply put, porting the wastegate is the physical fix, and tuning is the software fix.

And on some cars... the software fix isn't enough and they creep anyway. But up at this altitude, it doesn't seem to be a problem... I can't think of any tuned cars that are creeping up here.

Sorry to say this but there is no way to safely tune around boost creep, even if you set the wastegate duty cycles to 0 from say 4200rpm a car with boost creep will still creep under load say getting on it up the grapevine or something like that in 5th or 6th.

If you have boost creep simply smooth the leading edge from the uppipe into the WG port and you'll be cured.

Mike

Interesting...are there specific UP's that are more likely to cure the boost creep issue before it starts? It just seems like if the WG is too small to let enough exhaust pressure out, you're going to get creep...no matter what.

Typically cars with very good flowing exhausts are more likely to exhibit it, we saw this mostly on the original P17 housing, If recall all the vf39's now ship with P18 housings (I could be mistaken here) which fair much better.

If you have a turbo in your hand I would port the thing anyway, it's not very difficult to do and for the little time and effort can lead to better spool up as well as protect against the possibility of creep.

Mike

Good info Mike...thanks.

boost creep is over rated :lol:

fuel cut is what teh sucks :P (can be tuned out)

Yeah, I meant to imply that porting is the real solution, and tuning is only a bandaid.

But, for a lot of people, tuning seems to work most of the time. Tuning may not completely eliminate the issue, but it does lessen it. As you said later, I would also suggest porting the wastegate if you are already holding the turbo in your hand. No reason not to do it at that point.

Here's some car I found on the dyno today.

Awesome. Congrats Scott!

Yeah, I think that turbo sucks Scott... Clearly holding the car back... NOT...

Actually it clearly is, with awful response and a wastegate that seems to get overdriven by the turbo when it gets going.

Personally this car is crying out for something around the 20g size and to be honest probably the smaller TD05 given Scott's use for the vehicle being track and AutoX.

Mike

I sit corrected. The STI SM crowd should be scared...

Actually I didn't tell the whole story, I could well be wrong as well. Given that this was on whatever crappy 91 Scott left in the tank and coupled with the turbo's willingness to boost it might tell a different tale on real gas say 100 or so and make me have to eat another helping of humble pie.

Personally I am just glad the car is running and making power especially with the unexpected 3+ hours on the dyno it took me today due to setup issues.

Thanks a ton for all the work Mike. Sorry for the condition of the car, I had no idea it was in the shape it was in when I brought it over to you.

I'll probably be going to a bigger turbo in the spring or early summer. I want to see how the Gruppe-S 20G turns out... hopefully it'll fit good with the new housing and cost a bit less than the other offerings. Plus I still think I need a cage before I make the car even faster. :lol:

http://www.activewin.com/reviews/sof...shop-6-box.jpg

jk, nice numbers Scott. Well really it's just nice to see you having a functional car again.

<lightening bolt>

Frankensuby lives!!!!!!!!!!

:lol: I especially like that you used a pic of the car w/ two different wheels.

That's awesome. Congrats, dude. It's been a long wait.

Nice numbers Scott and real credit - Mike. I am surprised at the later spool. That torque curve is not all that different from mine with the GT-12. I would have expected less lag on that thing.

Scott do you have the headers on it yet. If not, I bet you see that torque number jump significantly.

Great to see your car running again.

Headers are on. But they're the Gruppe-S headers, not the GT Spec (or whatever ones you have). I don't think the Gruppe-S headers gain quite as much as yours... but at least they don't sound like ass. :P

I've got some new numbers. They're down from my original post with the wagon in this thread, however when we ran my car on the dyno at DB the car was putting down less power anyway (~176hp). Check out the torque curve though - coming on pretty early and holding strong.

Still just up-pipe/reflash.

http://www.turbocheese.net/pictures/wgndynodb.jpg

http://www.angrybenz.com/bilder/sric/060128_dyno.jpg
My first dyno run. Torque comes on quick (very happy with that) but then drops to near stock levels up top (the reason for the low HP number).
Invidia Catless TBE
I'm using a Cobb streettuner upgraded accessport.
I loaded a Stage 2 version 1.10 map and reduced the boost DC because I was getting too much boost and some fairly high EGT's. (950C). I set the higher load areas to something in between what cobb had and stock. I need to smooth it out in the higher RPMs.

I have my eyes on one of the Perrin rotated GT30R kits so I might just wait until later.

----------------------------------------------
EDIT: for not following the correct format:

Name: Dan Watt (R4ND0M_AX3)
Car: 2005 WRX STi
Mods: Cobb StreetTUNER (work in progress), Invidia V2 Bellmouth DP, Invidia N1 cat-back (not race), Snow tires and wheels
Wheel HP: 231 @ 5750 RPM
Wheel Torque: 261 @ 3250 RPM
Dyno: Mustang @ DB Tuned 01/28/06 8:57 AM

Stock engine "bpu" DSMs put that out with a 16g and some boost. If scotts car doesnt put out 320+ something horsepower, I'll be disappointed.

Get that 20g!

Whooo-ha, I got you all in check!

Name: Scott Perry (sperry)
Car: 2002 WRX
Mods: EJ257 short block, ported/polished WRX heads, TD05-20G turbo, PE800 injectors, Walbro 255lph fuel pump, Perrin fuel rails, Perrin BigMAF intake, Perrin FMIC, Gruppe-S jet-coated headers, Vishnu flex uppipe, Invidia TBE (catless/resonated).
Wheel HP: (289.3) @ (6000) RPM
Wheel Torque: (286.0) @ (4500) RPM
Dyno: (Mustang @ Gruppe-S)

I'm actually making less peak power than I got out of the GT30-10 turbo, but the torque difference, and area under the curve makes this setup hit like a truck-load of hammers. :eek: It's actually too fast to drive on the street, I have yet to floor it in 3rd gear. :lol: Maybe once I get the registration taken care of I 'll go floor it up a freeway on ramp or something. :devil:

The next step is to decide whether or not to keep the aquamist kit I've got. Gruppe-S couldn't get it working reliably due to the location of the pump under the hood and the tank in the trunk (the primer pump setup just wasn't reliable enough considering the risk to the motor if it failed). I think it will work better if I move the pressure pump to the trunk. However the kit is still a nightmare to install, and I'm not sure I'm qualified to do it, so I may just send the kit back... the car is retarded fast as it is.

That Dyno chart is what dreams are made of. Looks incredible. Can't wait to chase you around RFR :evil:

Very nice Scott. Glad to see you have your car back. Where are the pictures?

Congrats Scott! I've been wondering, does the DCCD on your 6 speed work?

water injection scares the shit out of me. too much to go wrong in my book.

Can't wait to see that monster Scott! turbo envy (points to self)

As soon as I figure out all the wiring... :lol:

Ha! Good luck with that. :) Does the DCCD have it's own "brain" or do you have an STi ECU or whu? :?:

There is a DCCD control unit, 3 g-force sensors (instead of the single one the car normally has), two switches, and a temp sensor in the rear-diff. I've got all the critical parts, and most of the wiring, but I think I'm probably missing some of the connectors.

Back when I first got the tranny like 10 months ago, I pinned-out the wiring harness and labeled all the wires and connectors... I just have to get around to installing it.

Wait, WRX's have a G-force sensor? Or did you mean STi's normally only have one G sensor? :?: Is the control unit a standalone computer? Do you still have a USDM WRX ECU?

There is a g-sensor in the WRX. I'm not sure exactly what it's for, probably the ABS system. The STI w/ the DCCD adds two more that are used by the auto mode for the center diff.

I am running an ecu out of an '03 automatic WRX. The only reason I'm not using my stock ECU is because I switched to a Cobb AP and didn't want to obliterate my EcuTek license... so I've still got my stock ECU lying around w/ that license on it.

That rocks Scott... First post updated...