Full Boost & Torque Sooner!!!!!!!!!!!!!!!!

07' 2.5L wrx 310whp/319wtq

Current Parts:
20G Turbo
Perrin Top Mount Intercooler
STI Y-Pipe
Cobb Turbo Back Exhaust
800cc modified injectors
Walbro 255 Fuel Pump
Perrin big MAF intake
GMBCS

I think that is it.
Installed and Tuned by R S Motors
on 92 octane gas from Shell

Pulls hard from 4000 to 6500rpms
Full spool around 4000k pull to redline

Goal: I want more driveable power sooner, for autocross or tight slower corners.



I would like to have full spool sooner my goal is 3000 to 3500 rpms I still want to pull to 6400rpms

Turbo swape:
I'm thinking a 16G or 18G will work better for my goals, but I'm considering really anything.
(I'm just collecting info for now not spending any of my pretend moneys and I will need to sell my 20G for some Drag racer/300 whp adict)

What other mods?

EWG?

Ideal: To hang onto 300wtq at 3000rpms and whp around 250 to 280, I looking more for the Torque, for short tracks, autocross and all around fun corner exiting!:biggrin:

 

well why the hell did you get a 20g?

 

Go with a Big 16G and you should get almost the same boost response that a 2.0 gets out of a TD04 and you should still be able to get over 300 Wtq and 300 Whp.

 

Its a great turbo, only has 5500 miles on it, power!, more power! better then the VF39 I was going to use. I've never driven at a autocross event before this weekend and I enjoy it much more then driving down the road.

Like a 16G with a 8cm hot side (do they make such a thing?)

 

Yes, Fuji had the Slowboy Racing EVOIII 16g 8cm.

Why not look into FP's new 68HTA turbo :biggrin:
Might get you where you want to go.

 

Nuke, you know lots me no little.

Anyone on this forum have luck with this Turbo? or a dyno?

On the forced performance website they say the 68HTA will flow 47lb a minute vs. a 20G at 44lb minute compressor?

The 68HTA sounds awesome!



Here my numbers with my current 20G

 

This is your first AutoX, just wait till you get to Valley Fair and other regional events including Hill Climb Events or the whole course at DCTC. You can make all the modification to your car, but there's no quick mechanical fix for every event. Start working on left foot braking and carrying more speed thru the turns and minimize on/off throttle for the events. Money can only buy soo much, but the monkey behind the wheel can do everything without cost many. Only than should one blame the car for its inabilities. LOL I got that out of a fortune cookies.


I've had that turbo on my old STI! Works fine for me. The other option is to pay Nuke or some other tuner to be your botch and tune your car for each event; I've done that too. LOL No but seriously look at the graph you posted if that in fact is yours, you can see that everything leading up to the peak hp/tq is all usable. DEE DEE DEE

 

look into 68hta.

 

VF39 with a e85 tune!!!:biggrin:

 

i would if i was you too

 

as for the 68hta, it's still a new turbo, you can probably contact fp for the 8cm, i wouldn't see why they would not swap it.

Should've kept the vf39 and had fun with that turbo first :biggrin:

 

I don't think 18G will help you much. I have full spool and peak torque at 3600 RPM. My td04 on 2.5L made 260 torque at 2800 RPM but only made 210whp at 5500 RPM. I think you best choice would be big 16G or any vfXX ball bearing turbos.

 

Why would the 18g not work for his stated goals? Full boost is pretty close to that of the big 16g and it will have more top end for when he is not auto crossing.

 

Well, maybe td05 18G would work better, but they spool anywhere from 3400-3600 RPM. I think he wants something that spools faster than that. He will get the power he wants but not the spool up. Good tuned STI turbo could give you nice quick spool up and decent power.

 

Port and polish everything from the manifold to the intake, tgv deletes, go back to a td04, and go with a external wastegate. top end is over rated anyway

 

I think it's SBR TDO6 8cm.

 

Anything smaller then an 18g will be just giving away power. My small 18g spools just as fast as a VF39, and has a lot longer usable power band.

Quoted RPM "spool" numbers greatly depend on your target boost and mods. Here's an old one I found of my TD05 18g 7 cm



As you can see, if my target boost was 18, I'd be hitting at 3200, but I'm hitting my target of 22 PSI at about 3400. Pretty much all VF39's with this similar boost target will hit similar boost targets at similar RPM. In addition, the 18g will flow much more at a given boost pressure when compared to a VF39.

With all of that said, you always need to pick a turbo for your purpose. I'd say your options are:

EVO III 16g, 22 PSI at 3200, ~275 WHP on a Mustang
TD05 18g 7 cm, full boost at 3400, ~300 WHP on a Mustang
TD06SL2 18g 7 cm, full boost at 35-3600, ~310 WHP on a Mustang
HTA68 7cm, ??????

If you've got the cash, I'd recommend trying out the HTA68. It's fairly new technology, but might be a pretty good performer. I don't think it'll have nearly the top end they're advertising, but I do think it will be a good melding between the spool of a small 18g, and the top end of a 20g.

 

I'm thinking of selling my pnp cermacoated vf39 so I could get the HTA68?

 

Also, if you're really looking for mid-range torque, get an E85 tune.

 

Just get AVO380 ball bearing turbo if you have money to spend. It would be perfect for autocross and dd. You will get the power and response that you are looking for.

 

8cm hot sideAVO 380 Ball Bearing Turbo

AVO 380 Series Turbos for the 08+ Subaru Impreza WRX & 04+ Legacy GT combine quick response with good mid-range response. Part of the Edge Series family, this S-Type is AVO's dual duty race and street turbo, designed for a blend of high response and devastating power for amazing bang for the buck! $1,849.00

This turbo has been around a little longer then the HTA68 but I've seen nothing for posted flow numbers, spool dyno graphs and it twice as expensive. The cost may reflect the quality of the turbo?

Best turbos so far:

HTA68 $800 New 47lb a min

AVO 380 $1800 New ?

 

http://walloftvs.org/images/tuning/pull3.JPG

This is what you should've done...

 

td04 correct?

 

Yes, td04 + e85 + wall of tvs' tune = crazy

 

Pfft, he wants to autox, not tear the pavement from the road and give himself whiplash

 

100% agree. TD06 + 8 cm = peak power, not spool.

Here's a good log and dyno of a very agressive tune on a TD05 20g 8 cm. 20 PSI by 3250.

Here's a better example of the same turbo on a less aggressive car and catted exhaust.

Anyway, it's all about a combination of mods and tuning, not just the turbo.

 

It'd be interesting to see how your wastegate and boost are set up. If it's not tuned for fast turbo response, you are NOT going to get it. My car was specifically tuned for response and you go half throttle, you'll hit 18psi around 5000rpm; peak on WOT is around 22psi tapering to 19.

Another thing to consider is, Autocross courses here especially MAC events that are held at the Midway Stadium, are really small courses. Your '06 WRX gearing isn't ideal for such small courses. Your first gear goes up to around 35mph? You'll hit that quick, then comes your LONG 2nd gear. You'll DOG your rpms around where the turbo spools. Your gearing isn't well suited for tight autocross events.

I've driven a 2.0L with a JDM 6spd, it makes a HUGE difference in get up and go. I put in a '97 Outback tranny into a '03 WRX 2.0L, it drives like it has a '07 STi 6spd. Your tranny with the 3.700FD and long ratios.... no good for autocross. Your power is great, you don't have the right gearing for the application if it really is autocross.

For now, drive it how you can. Drive according to what your car can do.

 

Have fun at the Test n Tune at DCTC with your current turbo. I would also check out the Amery Airport Speed events that aren't MAC events. Small autox course with a blast down the taxiway - 3/8th of a mile as I recall.

 

I don't know, tearing the pavement of the road sound fun :laugh:

Your right having it re tuned for quick spool instead of peak power will help, the correct gear set will change all the driving characteristics too, for now this car I want to drive everyday and keep the gear set stock. But I would like to swap gears in the future when the time and money is right.

So is the 7cm hot side smaller? and that will spool faster?

 

Yeah, stock class would be nicer to me then a mod class being a newbie to the whole autocross stuff. And yes the smoother and let violent your car moves the less time you loose by excesive movement turning or stoping.

 

Try running less boost with your turbo and see what happens. Talk to Ron and see if he can tune it for quicker spool but less power before you decide on buying another turbo. Just my .2

 

I was just thinking about that too, thanks ^

 

I am always curious as to why people say the 18g is such a waste. It has more power up top than any 16g and spools like a vf39. Bullwinkles car is proof to me that it isnt a waste, unless I am missing something. If I am please explain because I am honestly curious.

 

So going strictly off CFM numbers the upgrade from a Big 16g to an 18g is more significant than the 18g to a 20g. What do I know though, I think if tuned properly an 18g is an awesome turbo for folks that are looking to reach the 300 hp/tq area without the need to upgrade injectors and some other supporting mods.

 

I agree with you and disagree with Russ. 100 CFM is huge, and an 18g makes significantly more power then a 16g. In addition, all of those who say the VF39 is the same as the 18g are lying or just plain don't know what they're talking about.

When compared to a VF39, an 18g will see ~15-20 more WHP, and will spool just as fast and hold more boost throughout the whole powerband. I tuned a local member who went directly from a VF39 to an 18g and noticed a major increase in power and "power under the curve."

In addition, you can still tune an 18g with the stock 06+ WRX fuel system.

Yes, a 20g is a common upgrade from the VF39, and suggested for all 2.5L, as most people want at least 30-40 WHP to account for the work/money it takes to swap a turbo. With the right tune and mods, you can also make one spool virtually as fast as an 18g. Downsides are the higher chance of investment in additional parts (transmission, clutch, injectors, pump).

But hey, I'm probably biased, as I own an 18g. Here's my final tune in 50 degree weather .

 

You are a newbie in any class. Mod and stock classes have nothing to do with skill level.

 

So true. When my car is done and I finally go to an event, I'll be in XP, lol.