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Old 10-12-2010, 06:41 PM   #1
TH motorsports
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Talking THMotorsports Time Attack STI Engine Build Thread | 2.7L of Glory





Hello all,

We thought it is about time to go over our engine build. We wanted to show the Nasioc community that we built a great engine with lots of ability to grow in power. The chassis and suspension is not too shabby either, but lets get down with the build.

We started off with an EJ257 that already had an APS kit that had a
FP HTA GT3582R. Other than that, the car was on a stock block and some 800cc injectors.

We figured it was a good start, and with using Brian Crowers 2.7L stroker kit, we could really get spool times earlier in the RPMband. We started with our block and had it sleeved with Darton sleeves. After that we decided to use the same pistons that ken Block used in his STI at a 9:1 in 101.5mm (this was a good size because rings were readily available - its the same size as a small block chevy).




Bottom end:
The stroker kit was brian crowers with his premium billet rods, and forged crank. Ofcourse, the entire engine was ARP'd top to bottom, along with ACL race bearings. We used the street bearings and had them coated as the race ones were on backorder, and this is a nice trick you can do to achieve the tolerances of the race bearings. As we mentioned, we used the JE 9:1 pistons in the 101.5mm size and our block was pretty good to.




The Head:
For the head, we used the Brian Crower 280's, along with now his new cams gears. We used Brian Crower valves 1mm oversize on both intake and exhaust and a full port/polish 3 angle valve job was done for the setup. The head used ARP head studs, and we connected the head to the block through a custom cometic headgasket. Our first one didn't last too long.

Fuel:
We used a double pumper setup that worked very well the entire time, harnessing two walbro's. We are now running 1600cc injectors as our duty cycle maxed our fast on the 1000cc ultimate racing ones. It seemed really odd, but our tuner here told us to upgrade right away using the ultimate racing rail.



Tuning:
Hydra. The system proved to work well and was great to tune on. Just make sure you wait for it to load at car start .

This was our first EJ257 build and we learned a lot. It was a fun build and we realize that keeping the engine cool is harder than it seems. We are running a pretty beefy oil cooler on it which brought down those temps. As well, even though this is not in the right section, for those doing a similar build, make sure you work ducting properly. The engine needs to be cooled 100% as much as possible. Re-doing the fenders, hood etc to open things up helps. If anyone has any questions post them up or ask us.

There will be more to come. The car makes 450awhp on C16 on a super conservative tune at 21psi. Next year, we will be at 575-600awp and should be really having fun as our lap times with 450awhp are coming close to evo's running 700whp. It should be a great season at Redline next year too, look out for us in the Modified Class.


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Old 10-12-2010, 06:52 PM   #2
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Consider sending your heads out to swaintech to have the chambers/exhaust ports coated. My 2.7L putting out around 600WHP was quite cold blooded with coated chambers. The coating allows much of the heat to be blown out the exhaust and not transferred to the water jacket.
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Old 10-14-2010, 11:33 AM   #3
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We will contact them. This sounds like an excellent idea. We were thinking of doing this originally, but the time to send out the engine vs. the races coming up limited us into a wild build. We made an engine this year to last and be as a good base for testing the car. Next season, you will see us with more power faster lap times.

Edward
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Old 10-14-2010, 10:46 PM   #4
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I've always toyed with the idea of putting a secondary radiator where the TMIC sits, using the hood scoop to cool it. Problem is I'll never have a powerful enough car to even need extra cooling on to even test such a ridiculous idea. I just wonder if it would be able to cool water significantly more than it would absorb with heat soak. Anyway, throwing that out there.
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Old 10-15-2010, 03:38 PM   #5
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Quote:
Originally Posted by curo72 View Post
I've always toyed with the idea of putting a secondary radiator where the TMIC sits, using the hood scoop to cool it. Problem is I'll never have a powerful enough car to even need extra cooling on to even test such a ridiculous idea. I just wonder if it would be able to cool water significantly more than it would absorb with heat soak. Anyway, throwing that out there.
How much heat are you producing that the aftermarket one won't handle? Our koyo keeps the car very cool. Again, we found that ducting and airflow is very crucial for that engine. You may want to focus more on letting the fenders have some slits, or using heat wrap at places. You will see temps go down right away.

Eddie
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Old 10-15-2010, 03:41 PM   #6
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wow looks great!
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Old 10-19-2010, 11:50 AM   #7
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Quote:
Originally Posted by RedCamber View Post
wow looks great!

Thank you.... we put a lot of hard work into this beast. It never ends though.

-Adam
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Old 10-31-2010, 12:24 PM   #8
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1 more month and turning power to 600whp hurray
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Old 10-31-2010, 12:25 PM   #9
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Quote:
Originally Posted by MartinSTi05 View Post
Consider sending your heads out to swaintech to have the chambers/exhaust ports coated. My 2.7L putting out around 600WHP was quite cold blooded with coated chambers. The coating allows much of the heat to be blown out the exhaust and not transferred to the water jacket.
We will give this a shot. PM me their info if you can, I will see what we can work out.

Eddie
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Old 10-31-2010, 12:47 PM   #10
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Congrats on the DSport article.
Car looks good.
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Old 10-31-2010, 12:53 PM   #11
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thank you!
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Old 04-01-2011, 12:28 PM   #12
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Check out the Redline Time Attack - Circuit Battles PROMO Video!!!

Its pretty awesome!!!


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Old 04-06-2011, 02:03 PM   #13
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[email protected] making preparations for Round 2 of REDLINE TIME ATTACK - PRO TRACK CHALLENGE!!!
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Old 04-06-2011, 04:00 PM   #14
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Quote:
Originally Posted by curo72 View Post
I've always toyed with the idea of putting a secondary radiator where the TMIC sits, using the hood scoop to cool it. Problem is I'll never have a powerful enough car to even need extra cooling on to even test such a ridiculous idea. I just wonder if it would be able to cool water significantly more than it would absorb with heat soak. Anyway, throwing that out there.
custom hood vents, fender shims, there are a few ways of accomplishing this. i dont think a secondary radiator is required. a good after market aluminum works just fine (koyo, mishimoto)...

i do know i have a spare hood laying around im my garage and as soon as the weather decides to bare some sunshine im going to cut it up and fab up some vents, as well as a light pod for the front.


TH, keep up the good work! car looks good.
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Old 04-07-2011, 02:41 PM   #15
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Quote:
Originally Posted by cha86 View Post
custom hood vents, fender shims, there are a few ways of accomplishing this. i dont think a secondary radiator is required. a good after market aluminum works just fine (koyo, mishimoto)...

i do know i have a spare hood laying around im my garage and as soon as the weather decides to bare some sunshine im going to cut it up and fab up some vents, as well as a light pod for the front.


TH, keep up the good work! car looks good.

Yeah we were looking into running an oil cooler through the hood scoop. but scratched that idea.

I will post up how we arranged it.



lots more updates/upgrades


thanks guys


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Old 04-12-2011, 03:06 PM   #16
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We just got back from Redline Time Attack - PRO TRACK CHALLENGE.

More footage for circuit battles!!!

check out our FB account for all the updates!

http://www.facebook.com/pages/THMRacing/317648202327
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Old 04-14-2011, 11:24 AM   #17
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Another awesome weekend with Redline Time Attack, PRO TRACK CHALLENGE, Circuit Battles. We were once again going up against some very good PRO drivers and PRO race cars at the Firebird Raceway in AZ!!! We gave them a good run for their money!









Shout out to Travis @ Snail Performance in AZ and Adam from DB Tuned in CA for the big help with the tuning!!!





More reads here:

http://www.urbanracer.com/articles/a...asp?a=4791&z=1
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Old 04-14-2011, 06:23 PM   #18
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Old 04-15-2011, 01:06 AM   #19
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sick!!
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Old 04-15-2011, 10:45 AM   #20
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Quote:
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sick!!
thank you

More videos coming soon!
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Old 04-15-2011, 01:53 PM   #21
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I'm curious. what datalogging do you guys do, if any?
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Old 04-15-2011, 02:01 PM   #22
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Keep up the good work guys!
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Old 04-15-2011, 02:20 PM   #23
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Very nice!


I was wondering, what differentials are you running in the time attack car?
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Old 04-15-2011, 09:27 PM   #24
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Quote:
Originally Posted by Homemade WRX View Post
I'm curious. what datalogging do you guys do, if any?
we use the Hydra for dataloging. We just leave a laptop in the car while its doing practice laps.

Quote:
Originally Posted by Chris06Sti View Post
Keep up the good work guys!
Quote:
Originally Posted by MainFrame View Post
Very nice!


thank you sir!

I was wondering, what differentials are you running in the time attack car?
Carbonetic front and rear. One of my favorite things on the car actually. With the combination of the suspension the car feels very nimble...like a RWD with front assist...i dont know how to put it/explain better.


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Old 04-15-2011, 09:28 PM   #25
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