STi EJ257 short block going in!

Other than AVCS, STI and WRX heads are not that much different. The cams are identical except for slightly higher lift in the STI. The heads are the same casting, with the STI heads having very very slightly bigger air/exhaust chambers.

Bren also said that he can tune cars to make the same power with or without AVCS.

 
For those that don't trust road tunes please look into the extensive history of the airboy sheet and how proven it is. It reads 4hp lower then PSi's Dynapack, and a whopping 10HP lower the ESP's mustang dyno. Both done same day. I've verified this with over 10 different Subarus.
Let alone the other 1000 people using Airboy
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I was acutally editing my post right when you typed these. I did some double checking....

 
By the way Bren I never said I didn't trust your road tune. I prefer road tunes to tell the truth.

In the end a dyno number is just a number. How it performs on the street is the better animal. But, I just don't know about measuring the hp of a car based upon a device that doesn't look at the wheel speed/drum rotoation with a set number for force.

Take for instance. If you are doing the test on a hill up or down you are going to get a diffrent number then on flat ground. There are to many variables that can change and with a Dyno you pretty much take all the varibles out of the equation beside the tuner itself.

 
By the way Bren why you are on this forum right now. Have you ever heard of a car when it is at cruise speed 70-75 mph that it surges?

Like if I am on a flat spanse of ground then set the cruise anywhere from 70-75 mph I get like this surging effect. You can watch my boost gauge and it churns up form aroung

-10 psi to almost 0 then back down then up then down. If I am on a hill it doesn't do it. Only at speeds of 70-75 with cruise on.

Plus, with my new block in I have been wondering if I should tune for it? I have an 06' sti with tons of mods. I have been tuned in the past. But know I have all a built shortblock and was wondering if I would benifit from a tune. Like enough to pay $150 for.

 
Not normally, what I meant your car was just surprisingly good
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... other than my horrendous drivetrain slop
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. Gotta get new mounts for sure.

Thanks for clearing that up!
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Cruise control is the devil, throttle mapping and boost control at those loads plays a big role in it.

BTW: A stock 2.0L wrx is LUCKY to put down 165whp on this sheet. A TD04 is completely out of air at 245whp in best conditions too.

You should always have a fresh tune on the car given something has changed. A built shortblock with a lot of mods should have some serious tuning time put into it. Most time the compression changed and that's huge.

We use the same road/section/flat area for tuning. If you use a up or downhill the graph gets all squiggly, curvy and reflects the hill. It reads engine speed over time calculations based on vehicle weight, temp, humidity, delta weight, tire diameter as well
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With cars that can run on the stock ecu mapping without blowing up - we do overlays

Here's a stock 2010 WRX with the stock map VS. my tuned map, same day within 2 minutes of each other.

2010WRXvsstockTUNE.jpg


 
I know my compression ratio stayed the same. The pistons are Cosworth stock size. Have Manley H beam rods which are stock stroke.

I might have you look at it regardless once the breakin is done. I have heard you do some good work. Plus, the last tune I got was during the time my car was burning oil. So I might throw down some better numbers once everything is running correct.

 
Graph from the day of the tune:

2002TD04HYBRID550.jpg


Will post an updated graph after I run another 3rd gear log. It's super fun to drive! Torque hits early and hard!

 
^^Nice curve.. But good God the TD04 runs out of breath fast. Turns into an over sized hair dryer.

 
It will be nice to see what everyone else runs when we all go down there! Can't wait!

 
Haha over sized hair dryer, pretty much
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It sure does fall flat on it's face up top, but it's still fun for DD!

 
GrimmSpeed AOS and Group-N Motor and Transmission mounts went in this week. Also did a compression test at Lobstah's and showing 185's across the board. So far so good.

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Awesome!! Good to hear it's goin strong!!! You notice a big difference with the motor and tranny mounts?

 
Very solid feeling. No more engine vibration on start up/shut down. Definitely makes a difference. My 126k mile stock mounts needed to be changed anyway!

 
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