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Old 07-20-2005, 09:47 PM   #1
Gruppe-S
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Default WRX Heads should be better than JDM V8 heads when ported

Hey guys,

We just received the data on our WRX heads. It took about 3 pairs of heads (2 pairs destroyed ) and many hours of testing at the hands of an experienced (and certified) porting specialist but we finally did it!

We managed to make WRX heads flow about 10 to 15 cfm BETTER than the JDM V8 big port counterparts. With the smaller runner diameters and better flow rates, you will be looking at more flow at higher velocities. Bottom line? Since heads are where most of the top end gains come from these heads will make much MORE power

We will be testing these heads in the upcoming weeks on a stage 2 WRX. Stay tuned!

Heres some pics:




These particular heads received the Gruppe-S port work with a 5-angle valve job.


Gruppe-S port work with a 5-angle valve job
$1250 labor using your heads



Regards,

Preston

Gruppe-S Engineering
29150 Simms Ct.
Hayward CA 94544

Phone: (510) 783-5300

We Accept Paypal!
Paypal: sales@gruppe-s.com
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Old 07-21-2005, 11:45 AM   #2
thesmokingman
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Question, how is the flow matched regarding the dog legged ports?
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Old 07-26-2005, 05:08 AM   #3
02Toyowrx
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Visually not impressive, rookie porter. But i guess it is the results that count.
Dog legged port ex port is about a 5-6cfm diff. unported.
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Old 07-26-2005, 04:05 PM   #4
Gruppe-S
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The person porting our heads is actually a certified porter from Mondello (sp?) technical school specifically in terms of engine porting. He has been porting import and domestic heads for many many years, and has several sub 8 second cars under his belt. I personally wouldn't consider his porting to be rookie, but I guess you may say so if you have been doing Formula One work for most of your life.

Cheers,

Gary
Gruppe-S
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Old 08-01-2005, 08:27 PM   #5
Phat04WRX
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Awesome work Gruppe-S! what's the turnaround for this?
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Old 08-02-2005, 01:00 PM   #6
SW00P_G
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So you are saying better flow than a V8 head and still retain the stock valves??
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Old 08-06-2005, 08:52 AM   #7
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subscribed
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Old 08-07-2005, 02:42 AM   #8
03MBP
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Anyword on the Stage 2 dyno results yet? I'm definitely looking into this.
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Old 08-08-2005, 04:46 PM   #9
Gruppe-S
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Phat04WRX - PM sent

03MBP - Not yet

Thanks
Preston
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Old 08-10-2005, 01:08 AM   #10
deegan42
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i am also interested in this. are you guys going to do these with a core charge type deal so i dont have have my wrx immobile for a week or more while the work is being done?
Ryan
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Old 08-12-2005, 07:40 PM   #11
Gruppe-S
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Hey Ryan,

Probably not because we would have to have a steady supply of used heads coming in. Theoretically we would only need to front the first set of heads and then we could keep on sending out the set we have reworked from the last customer. Unfortunately, that never seems to work. We tried to do exactly that with our tranny core exchange and no one ever sends those back.

Thanks,

Geoff
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Old 08-16-2005, 09:04 AM   #12
2000wrx
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So what valves and cams are do you plan/recommed with a set up like this. I would think that with the cost of vales, cams, and assoc gear you would be well past the V8 head cost for a small gain in CFM... ????
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Old 08-19-2005, 04:36 PM   #13
2000wrx
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bumpity..... any more info here????
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Old 08-24-2005, 12:25 PM   #14
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I already have my WRX heads ready to go but it would be nice to see before and after dyno curves before I send it out.
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Old 08-25-2005, 03:26 PM   #15
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I would simply be thrilled to see actual v8 STi flowbench data.....everyone states how great they are, but I've not seen any numbers.

How did you guys determine that they flow better than v8 heads?

Tell us what your WRX heads flowed.....260 cfm @ .400"/28"? 280cfm?

You're asking a lot of money to port a set of heads with a valvejob; give us an idea of how well they perform.

S.
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Old 09-12-2005, 01:46 PM   #16
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Update?
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Old 10-01-2005, 07:39 PM   #17
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Bueller?
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Old 10-03-2005, 09:47 AM   #18
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^^^^ ditto

nice alturnative to the 3700 cosworth heads. but i need more info
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Old 11-01-2005, 10:30 AM   #19
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and if we provided the cams/valvetrain (non stock)

would that effect the price any?
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Old 11-04-2005, 12:21 PM   #20
2000wrx
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So I guess you guys are very proud of these heads... enough to not give us any info
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Old 11-04-2005, 03:05 PM   #21
KevinHeist
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id love to see some actual scanned in or otherwise proven data. this would make life pretty nice
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Old 01-31-2006, 12:23 AM   #22
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any bench flow sheets?...sorry for bringing back the long dead thread...just looking into heads at the moment.
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Old 01-31-2006, 08:00 AM   #23
2000wrx
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From what I have read, and researched the best bang for the buck would have to be V8 heads.
You figure a P&P on an ej205 head being in the 1200.00 range and still need to buy cams, the V8 head just looks very good at that point.
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