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Old 10-15-2017, 03:05 AM   #1
Pro60modman
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Default EJ207 STI on the dyno

I just like the RPMs

V8 207 32bit conversion
AEM intake
Custom downpipe, Invidia exhaust
ID1050X
Walbro 450
20psi
93

355/332 uncorrected

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Last edited by Pro60modman; 10-15-2017 at 07:00 PM.
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Old 10-15-2017, 12:40 PM   #2
mazdan
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Looks good. So how does it compare to the original EJ257?
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Old 10-15-2017, 06:52 PM   #3
silversurfer05
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Dyno sheet? Video ends too quick to get a clear view
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Old 10-15-2017, 07:00 PM   #4
Pro60modman
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355hp 332ft lbs uncorrected.


Last edited by Pro60modman; 10-15-2017 at 07:29 PM.
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Old 10-15-2017, 07:20 PM   #5
Pro60modman
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Quote:
Originally Posted by mazdan View Post
Looks good. So how does it compare to the original EJ257?
Compared to a 04 257 running 20psi on 93 it doesn't have as huge a torque hit. It's much smoother. Makes great power and the extra 1000+ rpm really makes a difference, especially going from 3rd all the way through 4th.
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Old 10-16-2017, 02:50 AM   #6
Calikid
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32bit conversion..?
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Old 10-19-2017, 12:43 AM   #7
Paul
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So your running USDM AVCS Cams and solenoids?
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Old 10-19-2017, 12:58 AM   #8
Paul
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So your running USDM AVCS Cams and solenoids?
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Old 10-20-2017, 01:33 AM   #9
ether947
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Are you running the VF37 turbo?
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Old 10-24-2017, 12:16 AM   #10
Pro60modman
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Quote:
Originally Posted by Calikid View Post
32bit conversion..?
Quote:
Originally Posted by Paul
So your running USDM AVCS Cams and solenoids?
Converted the engine to run on the USDM ECU and harness by swapping the EJ257 cams, AVCS solenoids, cam sensors and crank ignition trigger. I actually swapped every single sensor just to be safe but I kept all of the EJ207's original intake manifold, inlet tube, crankcase vent and water line system.

Quote:
Originally Posted by ether947
Are you running the VF37 turbo?
Yes
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Old 10-24-2017, 06:56 PM   #11
ether947
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Quote:
Originally Posted by Pro60modman View Post
Yes
Awesome!

One more question, when do you reach peak boost?

I have a EJ207 v8 too and I'm not too thrilled about the spool. Once you get into boost it is a blast to rev though.
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Old 10-24-2017, 09:01 PM   #12
181stLeader
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Quote:
Originally Posted by ether947 View Post
Awesome!

One more question, when do you reach peak boost?

I have a EJ207 v8 too and I'm not too thrilled about the spool. Once you get into boost it is a blast to rev though.
The 207 you have to drive differently than a 2.5L turbo. Below 3500 there isn't much, but they pull hard as soon as 4000 rpm comes.

If you go WOT at 2500rpm and expect it to get up and go you are gonna be disappointed. Drop a gear to get the rpms up and it will take off like a rocket. Going WOT at low RPM is hard on the engine anyway.
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Old 10-24-2017, 10:03 PM   #13
ether947
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Quote:
Originally Posted by 181stLeader View Post
The 207 you have to drive differently than a 2.5L turbo. Below 3500 there isn't much, but they pull hard as soon as 4000 rpm comes.
That's what I've noticed. I appreciate the confirmation, I guess I've got decisions to make.
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Old 10-26-2017, 07:30 PM   #14
cobrakin00
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Hey man that car must be a rocket
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Old 10-27-2017, 02:20 AM   #15
silversurfer05
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So from what i can gather. Usdm sti cams arent the limiting factor in usdm heads, its the ports and valves that help it breath past 6.5k til 7.5-8k. True? Or i need more research?
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Old 10-28-2017, 02:41 PM   #16
181stLeader
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Quote:
Originally Posted by silversurfer05 View Post
So from what i can gather. Usdm sti cams arent the limiting factor in usdm heads, its the ports and valves that help it breath past 6.5k til 7.5-8k. True? Or i need more research?
Its more of the ports, the v7 spec c and v8+ heads have big ports. The valves on the ej207 are the same size as its USDM counterpart.
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Old 10-29-2017, 03:45 AM   #17
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355 on a mustang dyno from a VF37 on 93??

edit: power dyno, not sure how that one stacks up.
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Old 10-29-2017, 10:24 AM   #18
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USDM cams are a more aggressive profile than EJ207 cams.

So same valves but the 207 big port heads are superior to 257, but 257 cams are better than 207...stock for stock. The EJ205 exhaust cam is actually more aggressive than the 257 exh cam.

My cheap spare parts 2.1 stroker DD engine has 257 intake and 205 exh in it.
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Old 10-29-2017, 07:24 PM   #19
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Quote:
Originally Posted by JMlegacy View Post
355 on a mustang dyno from a VF37 on 93??

edit: power dyno, not sure how that one stacks up.
It's a mustang dyno. Power Dyne is what Mustang calls their software.
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Old 10-30-2017, 12:28 PM   #20
86Dreams
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What was your average airflow ?
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Old 10-30-2017, 04:29 PM   #21
silversurfer05
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Quote:
Originally Posted by 181stLeader View Post
Its more of the ports, the v7 spec c and v8+ heads have big ports. The valves on the ej207 are the same size as its USDM counterpart.
So would a port and polish net equivalent port size? I friggin want 7.5 k on stock cams and valves
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Old 10-30-2017, 04:31 PM   #22
silversurfer05
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Quote:
Originally Posted by Homemade WRX View Post
USDM cams are a more aggressive profile than EJ207 cams.

So same valves but the 207 big port heads are superior to 257, but 257 cams are better than 207...stock for stock. The EJ205 exhaust cam is actually more aggressive than the 257 exh cam.

My cheap spare parts 2.1 stroker DD engine has 257 intake and 205 exh in it.
**** i might use the 205 exhaut cam if this proves true
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Old 10-31-2017, 02:04 AM   #23
Nick411
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Quote:
Originally Posted by silversurfer05 View Post
So would a port and polish net equivalent port size? I friggin want 7.5 k on stock cams and valves
It would have to be quite the porting job as the difference is massive. You'll more than likely run into issues with the casting thickness of the walls before you get to the size of the 207 heads. 90% of the gains from a porting job are from blending the area from the valve stem into the valve seat anyway. On stock cams you'll only notice the gains from that anyway as the cams are the limiting factor, not the port size.

ej207-heads by Nicholas Schweiger, on Flickr
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Old 10-31-2017, 08:39 AM   #24
tomacGTi
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Quote:
Originally Posted by Homemade WRX View Post
USDM cams are a more aggressive profile than EJ207 cams.

So same valves but the 207 big port heads are superior to 257, but 257 cams are better than 207...stock for stock. The EJ205 exhaust cam is actually more aggressive than the 257 exh cam.

My cheap spare parts 2.1 stroker DD engine has 257 intake and 205 exh in it.
I'm going by measurements from awhile ago but what defines more aggressive?

By all the research I've done here, STi and later 257 cams have slightly more lift and the same duration as WRX cams whereas the 207 cams and "s" cams from the s204 and beyond cams have less lift but more duration. Some are also dAVCS.

https://forums.nasioc.com/forums/sho...light=sti+cams

If you mean by installing the exhaust cam without adjustable sprockets, then yes the WRX cam is "better" because it sits more advanced than an STi cam single AVCS. It still has less lift however.

Also, by installing the sAVCS intake without an adjustable sprocket, it won't come on until much later in the rev range. It can't be cheated either because the cam pickup is in the sprocket.

https://forums.nasioc.com/forums/sho....php?t=1411812

Not here for an argument, just here for discussion. I have dealt with these cams in my own build. It took quite a bit of experimenting to figure out.

https://forums.nasioc.com/forums/sho...2582784&page=3

-Randy
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Old 10-31-2017, 11:06 AM   #25
Samurai Jack
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Quote:
Originally Posted by 181stLeader View Post
Its more of the ports, the v7 spec c and v8+ heads have big ports. The valves on the ej207 are the same size as its USDM counterpart.
This statement is not entirely accurate.
JDM 207 V7 heads have big ports
JDM 207 V7 Spec C heads have same big ports + some additional polishing by Subaru

JDM 207 V8+ heads are similar to v7 Spec C heads
While the cams are the same, the v8+ valve springs are not as strong as the v7 Spec C valve springs

EDM 207 heads have the smaller ports.
Not sure if this applies to all non-JDM 207 heads, ie; AusDM heads
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