Built hybrid - GT35R - 92octane + meth - dyno tune

[CoolRex]

Event: dyno pull
Location: Epic Motorsports Fayetteville, NC
Ambient Temp: 55 degrees
Elevation: feet above sea level
Weather: sunny, chilly

Car: 2004 Subaru WRX
Tuner: Robbie Latta @ Epic Motorsports
Dyno Info: Mustang
Peak HP at RPM: 424.5 @ 6271 RPM
Peak Torque at RPM: 410.4 @ 4492 RPM
Baseline hp/tq for a stock on same dyno: ~225 hp for a STi
Target Boost: 22 psi (how about 22 psi before 4000 rpms sound )
Target AFR: 11.8 on methanol injection
Fuel: 93 octane on 100% methanol injection using a M10 nozzle

Engine/Power Modifications: Coolrex Engineering 2.5L EJ257 shortblock, 99.75mm CP pistons, stock STi rods, STi crank, STi cams, Sti headgaskets, 8.8:1 CR, EJ205 Heads with Coolrex Engineering mild porting/polishing (VERY MILD ), Garrett GT35R with Tial vband .63 exhaust housing, Tial 44mm EWG, Hallman Pro manual boost controller, Coolrex Engineering 3" intake with K&N filter, TurboXS rotated uppipe and downpipe modified for vband, TurboXS rotated FMIC piping with blow thru MAF, TurboXS FMIC, TurboXS fuel rails, Coolrex Engineering TGV deletes, IXIZ AOSep, IXIZ intake manifold isolators (work AWESOME), Stock modified BOV, SMC methanol injection kit with M10 nozzle, Walbro 255 pump, modified stock injectors (820cc), Maddad Equal Length Headers with modded for EWG Maddad uppipe.


Driveline Modifications: 2007 STi 6 speed, ACT 6 puck sprung clutch/pp
Suspension Modifications: RCE Blacks with Tokico DSpec's, GTSpec ALK, Perrin 25mm sways and endlinks

Dyno Sheet (horrible pic but it the best I have right now):


Video: Sorry this is on my camera phone and there is a lot of dyno background noise

Video0006.flv video by razzamagoo - Photobucket

Video0006.flv video by razzamagoo - Photobucket

Credits: I have to give credits where they are due. 3 people have contributed to helping me.
1.... WJM Thanks for the tech and support buddy.
2.... is Robbie @ Epic Motorsports. He never gave up on the tune and fought that annoying blow thru MAF for some great results and on several occasions helped me in a pinch when I was unsure about something I have done
3.... would have to be Doug @ Topspeed. He originally helped me spec out the motor while I was building it and convinced me on my turbo setup. Thanks for your input and support buddy.


Robbie has the skills over at Epic. Also Steve and Jason constantly listened to me and provided their input on my build. I've seen many cars go in and out of Epic Motorsports in the 3 months I've been building my setup. You simply can not go wrong with them! Give Epic Motorsports a call.

Blow through MAF's are horrible to tune but NOT impossible. They are very hard to get a nice straight AFR curve as you can see in my dyno sheet but my curve is +/_ .1 point of AFR and I'm running stupid low timing so I'm safe as can be. Towards redline I was maxing out the MAF and it wanted to run lean so Robbie dumped fuel in as rich is better than lean....it worked. I'm contemplating going back to suck through MAF to see if the car likes it better but so far it's smoother than stock right now.

The car freaking pulls like a banshee. Never stops pulling on the street. Full boost around 3800 rpms according to datalogs. This setup far surpasses my old record setting 18g on the EJ205.

We are going to put some more miles on this engine before pushing it more as there is a LOT of room for more boost and timing. It was dynoed with only 500 miles on the new engine so right now I'm gonna enjoy it. Stay tuned later for more in the spring time

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[STi Mikey]

Very nice. I was gonna say, 22 psi on meth? Then I read further. If you think your having fun now, wait till you turn her up!!

[CoolRex]

Originally Posted by STi Mikey

Very nice. I was gonna say, 22 psi on meth? Then I read further. If you think your having fun now, wait till you turn her up!!

Yeah I think she is making very respectable power at 22 psi and only 16 degrees of timing

FYI my bone stock EJ205 was boosting 26psi on meth

[juanmedina]

dude, what happen ?

post some datalogs, or run an Airboy

Congrats

[CoolRex]

Originally Posted by juanmedina

dude, what happen ?

post some datalogs, or run an Airboy

:slap: Shut up

I can't get a freaking Airboy to work on my PC for some reason. Ran out of patience with it.

[juanmedina]

Originally Posted by CoolRex

:slap: Shut up

I can't get a freaking Airboy to work on my PC for some reason. Ran out of patience with it.

email a log and I do it for you

[CoolRex]

Originally Posted by juanmedina

email a log and I do it for you

Will do it some time. Right now I'm just enjoying it (car was down for 3 1/2 months so I've been driving the piss out of it) I'm happy.

[All4bSpinnin]

how many rpms are you spinning it to?

[juanmedina]

Originally Posted by CoolRex

Will do it some time. Right now I'm just enjoying it (car was down for 3 1/2 months so I've been driving the piss out of it) I'm happy.

I am pretty sure you are!, your built was more frustrating than mine . So, is the car still weighting 2800 lbs? If it is, it must feel unreal. Any plans on going to the track?

I need a ride

GL

[CoolRex]

Originally Posted by All4bSpinnin

how many rpms are you spinning it to?

Stock limit. No point in revving past 7K.

[CoolRex]

Originally Posted by juanmedina

I am pretty sure you are!, your built was more frustrating than mine . So, is the car still weighting 2800 lbs? If it is, it must feel unreal. Any plans on going to the track?

I need a ride

GL

Doubt it. I put many things back into it as now I'm focused on driving it and enjoying it vs killing times at the track.

[Swine]

Impressive man, congrats!

[SacksLax]

Robbie does it again...great numbers, I couldn't be more happy with my tunes from him either!!

[CoolRex]

Before people start asking why I chose a .63 exhaust housing.....yes tq falls up top as my timing is safe and low. I built this car for a wider power vs making all out power. I'm boosting a full 22 psi before 4K That's EXACTLY what I wanted.

[john 1badSTI]

I am so glad you are smart to know that you don't have to crank it high in the revs and you also understand you don't need to crank it past where it makes power.Just to let you know if you switch back to a suck thru maf you will max it out even sooner,just to let you know. good luck and enjoy your ride

[CoolRex]

Originally Posted by john 1badSTI

I am so glad you are smart to know that you don't have to crank it high in the revs and you also understand you don't need to crank it past where it makes power.Just to let you know if you switch back to a suck thru maf you will max it out even sooner,just to let you know. good luck and enjoy your ride

Right now the TXS Blow thru is a 70mm. So you think I would not do any better with going with a KSTech 83mm suck through MAF?

[john 1badSTI]

all the blow thru I have used on customer cars and tuned were 3",the kstech is a bigger suck thru but since it is not pressurized like a blow thru it still might get maxed out too soon.Just to let you know I have seen 600whp on a 3" blowthru no problem.

[maxpowr]

congrats...enjoy.

[All4bSpinnin]

Originally Posted by CoolRex

Stock limit. No point in revving past 7K.

why do you say that?

[CoolRex]

Originally Posted by All4bSpinnin

why do you say that?

Look at the dyno chart and you will see. Tq drops and hp is starting to fall off. Shift and get back into the meat of the power band.

That's one of the biggest killers at the drag strip.....drivers not knowing how to read their power band and take advantage of it.

[maxpowr]

why rev the motor to the limit when the power band is well before 7500. its pretty simple.
the 2.5l's have more rotating mass than the 2.0's. the ej207 powerband reads differently.
also depends on your turbo/injector/bolt on setup.

[Epic Motorsports]

Thanks Delette glad I could tune your car. Cant wait to dog on her a bit more this spring! Woot.

[CoolRex]

Originally Posted by Epic Motorsports

Thanks Delette glad I could tune your car. Cant wait to dog on her a bit more this spring! Woot.

Indeed!

[john 1badSTI]

Originally Posted by CoolRex

Look at the dyno chart and you will see. Tq drops and hp is starting to fall off. Shift and get back into the meat of the power band.

That's one of the biggest killers at the drag strip.....drivers not knowing how to read their power band and take advantage of it.

finally someone else understanding that it is useless to run past where the motor makes power and to shift to stay in the powerband.

[ownnij]

i was expecting something closer to 450whp with a 35r and 100%meth on 93 pump but i guess the smaller exhaust housing has something to do with it and the small amount of timing. i dont know... =(