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Old 02-23-2006, 02:23 AM   #1
STI8U
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Default Maximum HP on JDM EJ207

What is the maximum HP on a JDM STI EJ207 (version 10) with stock internals?

Also, at what point should you upgrade the 565cc injectors?
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Old 02-23-2006, 03:09 AM   #2
SSFWRX
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I dont think anyone knows the limits of the stock internals on the JDM EJ207 all to well. As far as injectors go....the stock JDM 565cc's arent gonna do much more than simple bolt ons.
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Old 02-23-2006, 08:42 AM   #3
jtanoyo1
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Haha, I think I will find out what that "limit" will be with my car sometime this year, before I switch to a 2.5L shortblock.... Keep u guys posted.
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Old 02-23-2006, 08:56 AM   #4
ride5000
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i've seen a couple of 500whp ej207s floating around, fwiw.
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Old 02-23-2006, 11:14 AM   #5
Capt Crunch
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Quote:
Originally Posted by ride5000
i've seen a couple of 500whp ej207s floating around, fwiw.
yeah, there's that guy running the ultimate performance GT35R kit who I think made 500 whp.
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Old 02-23-2006, 11:41 AM   #6
Blackboxracing
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is that with a completely stock engine? heads, internals, etc
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Old 02-23-2006, 11:49 AM   #7
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GT35R 504.7whp;)

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Quote:
Originally Posted by STI8U
What is the maximum HP on a JDM STI EJ207 (version 10) with stock internals?

Also, at what point should you upgrade the 565cc injectors?
Thread:
http://forums.nasioc.com/forums/showthread.php?t=842346

I made 504 WHP on a dynapak running 32psi through a stock JDM STi v7 motor. I've daily driven the car since then and the motor leak down tested perfect as of 2 weeks ago. Keep in mind on pump gas everyday i don't beat on it very much. I mostly run 18-19psi and not the 23psi i was tuned for on pump gas. I have run about 30-35 gallons of C-16 through it though since the tune, as well as a couple drag passes.

This was stock heads/cams. Some headwork and cams would really help out.

I did not expect the motor to last me many miles. I know it can go anyday, but i do feel it's a somewhat reliable setup if you give it some good high octane fuel and don't beat it on pump gas.

Hope this helps,

Louis
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Old 02-23-2006, 01:43 PM   #8
Javier
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I overboosted my ej207 accidentally to over 30psi and blew a headgasket.... The internals just laughed at me and asked for more
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Old 02-23-2006, 01:48 PM   #9
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Quote:
Originally Posted by Soon2Bgreat
Thread:
http://forums.nasioc.com/forums/showthread.php?t=842346

I made 504 WHP on a dynapak

Louis
504HHP?(Hub Horse Power)
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Old 02-23-2006, 02:28 PM   #10
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Quote:
Originally Posted by Kingpin
504HHP?(Hub Horse Power)
thats still at least 470 whp on most other dynos
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Old 02-23-2006, 02:33 PM   #11
cronic
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Quote:
Originally Posted by justboosted02
thats still at least 470 whp on most other dynos
I know but i like busting his balls..lol
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Old 02-24-2006, 04:09 AM   #12
STI8U
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Hmmm, a local tuner here that does Motecs for a lot of rally cars in Australia reckons the stock internals on STI Spec Cs are only good for 400lbft torque (flywheel). Says the pistons since v8 have gone down a grade and they have problems with the spacing between the rings or something...
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Old 02-24-2006, 12:03 PM   #13
Javier
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The V8 pistons are made the same as the usdm sti pistons so that's not surprising. Most would agree that the V7 STI pistons are more hearty and can take more abuse...
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