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Old 07-19-2008, 09:50 PM   #1
summitwrx
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Member#: 148476
Join Date: May 2007
Chapter/Region: RMIC
Location: Grand Junction, Colorado
Vehicle:
2002 impreza wrx
psm

Default My hybrid build

This is my plan for my 05 ej257 shortblock, let me know what you think.

mahle (4032) 100mm pistons
stock sti rods with arp rod bolts
stock sti crankshaft
ACL rod/main bearings
cometic gaskets
arp head studs

Does everyone think this is a good set-up for say 350-430 HP on a gt30r. The car will be a daily driver(and track once or twice a month) and so ive heard that the mahle 4032 pistons are better for daily driven applications. I will be running stock 2.0 heads for now. Also will a stock timing belt hold up to this abuse. If not whats a better timing belt, greddy, spt, other?

Please let me know if this is a practical build, or if you have any suggestions (IE. forged rods over stock rods, different pistons...etc)
Thanks for looking and thanks for the help if you have any suggestions for me.
Chaz
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Old 07-20-2008, 07:08 PM   #2
mikeis300
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Member#: 149526
Join Date: May 2007
Chapter/Region: NWIC
Location: portland metro area
Vehicle:
2002 aps dr65 hybrid
9.1x1 built block/heads

Default

Quote:
Originally Posted by summitwrx View Post
This is my plan for my 05 ej257 shortblock, let me know what you think.

mahle (4032) 100mm pistons
stock sti rods with arp rod bolts
stock sti crankshaft
ACL rod/main bearings
cometic gaskets
arp head studs
thats a good list of parts how ever most for get that your starting off with a great black to begin with( i.e. its not a honda) so most of the stuff you can spend money on isn't necessary. i would recommend something like this for a GT30r build.

List:
-----
CP 100mm pistons
stock sti rods (stock sti rods are forged)
stock sti crankshaft( again forged)
STI gaskets (try to find threds, if any about sti head gaskets blowing)
arp head studs (for a gt30r its over kill, stock ej257's are very well made)
stage 1 or 2 crower cams (minimum sti cams)
[/quote]

Does everyone think this is a good set-up for say 350-430 HP on a gt30r. The car will be a daily driver(and track once or twice a month) and so ive heard that the mahle 4032 pistons are better for daily driven applications. I will be running stock 2.0 heads for now. Also will a stock timing belt hold up to this abuse. If not whats a better timing belt, greddy, spt, other?
[/quote]

also the 9.1*1 compression ratio is much better for a gt35 or below. the higher cp ratio makes daily driving much better (under 3k has much more torque) and after that boost is much more responsive (higher cp ratios make more power on lower boost).

if you want the 400whp then get a gt32r. you can get the most power out of pump gas on that turbo,with fastest spool(spool to power ratio)

stock ej257 belts are great.

Quote:
Originally Posted by summitwrx View Post
Please let me know if this is a practical build, or if you have any suggestions (IE. forged rods over stock rods, different pistons...etc)
Thanks for looking and thanks for the help if you have any suggestions for me.
Chaz
you need bigger cams. sti cams will get the job done for cheap but i would recommend crower's stage 2. stock rods are forged and there isn't a need for them to be upgraded. wait till your at 650whp to worry about those, until then save your money for a port and polish(which you should do with the heads already off the car)
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Old 07-21-2008, 01:43 AM   #3
summitwrx
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Join Date: May 2007
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Location: Grand Junction, Colorado
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2002 impreza wrx
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Default

Thanks, any reason you suggest cp pistons over mahle pistons? Ive just heard that mahle was the first piston company to make them for our car and they have the most experience, and also that most nascar cars use them, so they gotta be tough. But i could be wrong.

I am using stock rods and a stock crankshaft. Also figured the aftermarket upgraded timing belt was just some added security.
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Old 07-21-2008, 06:06 AM   #4
mikeis300
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Join Date: May 2007
Chapter/Region: NWIC
Location: portland metro area
Vehicle:
2002 aps dr65 hybrid
9.1x1 built block/heads

Default

Quote:
Originally Posted by summitwrx View Post
Thanks, any reason you suggest cp pistons over mahle pistons? Ive just heard that mahle was the first piston company to make them for our car and they have the most experience, and also that most nascar cars use them, so they gotta be tough. But i could be wrong.
i think that the cp pistons are just a better quality for duration and endurance, i was assuming this was your daily driver and not a track car. cp pistons are more for the street enthuses and the mahle are for the drag strip motor that you don't expect to make it more than one season. if longevity is important to you i would recommend cp pistons. also basing your build off of what nascar uses in their motors is the best example of marketing and advertising. if nascar starts a diesel devision then kfc will sell bio-fuel and you can bet that nascar will be sponced and use kfc ultimate octane bio-diesel. and you and the rest of the nascar fans will be there to hand them money

Quote:
I am using stock rods and a stock crankshaft. Also figured the aftermarket upgraded timing belt was just some added security.
to each his own but with sti's the oem quality is setup for racing products.
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Old 07-22-2008, 12:33 AM   #5
summitwrx
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2002 impreza wrx
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Default

I wasnt saying just because nascar uses them they are good. I just assumed that nascar cars can above 200mph at almost 13k rpms. Thats high abuse for a piston!!!

I dont get why people on here always tell people not to do things such as upgrade the rods always saying "stock is good to 500hp) and ive heard this thousands of times, and yet tuners always seem to say different. I dont get how everyone can say "Why would you put a high-performance rod in your car?" Just makes no sence to me, considering most high hp subies are running cosworth internals and eagle internals...etc. Anyways thanks for the help.
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Old 07-22-2008, 01:29 PM   #6
bluescoobywagon
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Location: The land of E85
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Not A Wagon!
2011 WRX - 285s on 18x10s

Default

I went with the Gates Racing belt as it's a cheap upgrade compared to other belts. Also, if you're looking for the ARP STI rod bolts, I've got some that I'm not going to use. I was going to use them with stock rods based on my hp levels, but I decided I didn't trust the rods at 8,000 rpm even with the bolts so I've got some Manley H beams on order. However, they'd be great for a lower RPM motor.
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Old 07-23-2008, 01:33 AM   #7
summitwrx
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Join Date: May 2007
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Location: Grand Junction, Colorado
Vehicle:
2002 impreza wrx
psm

Default

Yea, im going back and forth. Its either buy brand new subaru rods, or buy new aftermarket rods. And I just figure i might as well upgrade for the extra couple hundred bucks, that way when the 30r goes bad if it ever does, i can run the 35r with no problem. Im still debating though.
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