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Old 07-03-2008, 09:40 PM   #1
icslowmo
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00/5 Silver STi RS
FAT 40R kit w/ FMIC

Default CP Pistons or Wiseco Pistons???

I have both sets and trying to decide which set to use..

Plans for car:

2.5L STi short block - will have converted to closed deck.
Upgraded crank for oiling issues and rpms.
Built race heads - think 8500-9000rpm ish rev limit.
4094R Turbo 25-35psi of boost depending on whats next to me
07' N/A Intake Manifold - possable reverse mount.

Anyways looking to run 25psi most of the time but want to get it up to 35psi with out issue if possable. 35psi want be often but 30psi more then likly. Looking to make between 500-700whp depending on temps and boost.


Wiseco = 99.5mm bore, 9.0 cr, rist pin offset, 2618 alloy
CP pistons = 99.5mm bore, 8.2 cr, on center rist pin, 2618 alloy

Which ones would some of you use and why???

Thx for any input you have.
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Old 07-04-2008, 12:41 PM   #2
jazmak24
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wiseco is the better of the two.
if you are trying to save money ,than go with th cp's
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Old 07-04-2008, 01:00 PM   #3
irascible
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I spoke to Clark Turner who explained that Mahle makes the best pistons for our engines.

Supposedly the wrist pin offset on other brands aren't correct for proper alignment on the block to remove the wrist pin if needed.

Honestly, just the fact that mahle has the longest track record for making pistsons for our motors is enough for me.
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Old 07-04-2008, 01:08 PM   #4
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Quote:
Originally Posted by irascible View Post
I spoke to Clark Turner who explained that Mahle makes the best pistons for our engines...
Really? Now that is interesting...
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Old 07-04-2008, 01:26 PM   #5
St.race
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If I had to choose between Wisco and of the shelf CP, I would go with Wisco hands down.
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Old 07-04-2008, 02:05 PM   #6
icslowmo
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Seems to be Wiseco is the better of the two. Any reason why you all feel this way?? Reason why CP's not as good???
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Old 07-04-2008, 05:56 PM   #7
my99maddog
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I was advised to use the STi gudgeon pins with Wiseco pistons. This was after an engine autopsy showed the (light) Wiseco pins had flexed under high boost.
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Old 07-04-2008, 06:02 PM   #8
kyleblix
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my tuner, (PDX) suggested mahle also....
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Old 07-04-2008, 06:19 PM   #9
bandit_2017
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i would go with the CP's because the lower cr
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Old 07-04-2008, 06:37 PM   #10
icslowmo
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Quote:
Originally Posted by my99maddog View Post
I was advised to use the STi gudgeon pins with Wiseco pistons. This was after an engine autopsy showed the (light) Wiseco pins had flexed under high boost.
What piston pins are these??? Stock???
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Old 07-04-2008, 07:43 PM   #11
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Quote:
Originally Posted by kyleblix View Post
my tuner, (PDX) suggested mahle also....
Jeeeze...first Clark, now Jarrad? Since when did PDX go back to recommending Mahles? A year ago it was CP, period, after they had several Mahle 4032's break.

I assume this is the new 2618's, yes? And if you don't know, ask 'em if you don't mind. I'm curious.
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Old 07-04-2008, 09:45 PM   #12
my99maddog
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Quote:
Originally Posted by icslowmo View Post
What piston pins are these??? Stock???
May not be the same as Aus but standard WRX pins are fairly heavy. The STi items have a nice inside taper, retaining strength whilst losing some weight at the same time. Whilst the Wiseco concerned (pins only) were very very light! To try and describe the damage the piston had bitten the bore at both 90deg points from the axis of the Piston pins.
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Old 07-04-2008, 09:59 PM   #13
methaddict
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Wouldn't the closed deck have a tendency to overheat?
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Old 07-04-2008, 10:08 PM   #14
flycaster
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Quote:
Originally Posted by my99maddog View Post
...To try and describe the damage the piston had bitten the bore at both 90deg points from the axis of the Piston pins.
Are we talking gouges, or just bad scuffing. Also, what piston-wall clearance was used?
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Old 07-05-2008, 08:32 AM   #15
my99maddog
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Quote:
Originally Posted by flycaster View Post
Are we talking gouges, or just bad scuffing. Also, what piston-wall clearance was used?
Very bad scuffing. Sorry, not sure on clearances.
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Old 07-05-2008, 10:41 AM   #16
icslowmo
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The piston pins that came with the Wisecos are not "light", they look to be 1/4inch think tubing, looks as good as stock USDM STi pins, I'll have to measure them.

The recommend clearance is 0.003 inch, mind you they also have the side skirt coating, so after that wears a little, that will open up a little.
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Old 07-05-2008, 10:45 AM   #17
icslowmo
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Quote:
Originally Posted by flycaster View Post
Jeeeze...first Clark, now Jarrad? Since when did PDX go back to recommending Mahles? A year ago it was CP, period, after they had several Mahle 4032's break.

I assume this is the new 2618's, yes? And if you don't know, ask 'em if you don't mind. I'm curious.
What is/was so good about the CP's, the 2618 alloy vs. 4032??? Is that really the only main difference between Mahle and CP???
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Old 07-05-2008, 11:03 AM   #18
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Default posting up

The 2618 is the perfect piston, the 4032 gets brittle with high boost and can break so I have been told and read,these pistons are for non boosted engines, either cheap ass off the shelf piston will work fine just make sure and set the clearances to the manufacture spec and hope they dont fail. I would use cosworth pistons over your two choices but they cost twice as much, The mahle pistons are good too. You know Nascar and Formula one uses them they must be the best ?lol

Last edited by pddvl1; 07-05-2008 at 11:17 AM. Reason: spell checked
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Old 07-05-2008, 11:12 AM   #19
pddvl1
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Quote:
Originally Posted by methaddict View Post
Wouldn't the closed deck have a tendency to overheat?
Go to cgperformance.com these guys close deck blocks in sandrails in the desert and beat the crap out of them and they dont have any issues.
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Old 07-05-2008, 11:16 AM   #20
pddvl1
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Quote:
Originally Posted by irascible View Post
I spoke to Clark Turner who explained that Mahle makes the best pistons for our engines.

Supposedly the wrist pin offset on other brands aren't correct for proper alignment on the block to remove the wrist pin if needed.

Honestly, just the fact that mahle has the longest track record for making pistsons for our motors is enough for me.
If you can't remove the piston with the wrong offset then how in the hell do you get them in? Have you pulled a Subaru piston out before ?
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Old 07-05-2008, 11:19 AM   #21
pddvl1
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Default piston faq

The piston faq at the top of this forum should give you guys the just of all the piston materials and pros and cons of each
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Old 07-05-2008, 01:09 PM   #22
mick_the_ginge
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Quote:
Originally Posted by pddvl1 View Post
Go to cgperformance.com these guys close deck blocks in sandrails in the desert and beat the crap out of them and they dont have any issues.
What cgperformance shows is not a closed deck, it's just a brace the top of the cylinder which is very different. The lower cylinder still has a large coolant bath.

I have a fully closed deck block, I do not have a heat problem.

I like CP's, Wisco's & Mahle 2618's
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Old 07-05-2008, 01:13 PM   #23
mick_the_ginge
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Quote:
Originally Posted by pddvl1 View Post
If you can't remove the piston with the wrong offset then how in the hell do you get them in? Have you pulled a Subaru piston out before ?

Nice job on calling BS!!!!! I was thinking the same thing
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Old 07-05-2008, 01:32 PM   #24
pddvl1
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Quote:
Originally Posted by mick_the_ginge View Post
What cgperformance shows is not a closed deck, it's just a brace the top of the cylinder which is very different. The lower cylinder still has a large coolant bath.

I have a fully closed deck block, I do not have a heat problem.

I like CP's, Wisco's & Mahle 2618's

The brace I think would be enough to support 30-35r power and keep the sleeves from moving back and forth and theprice is right 600-700 . I am really gun shy about sleeves and failure due to install and dropping and such. The block does not seem to have the proper thickness to support the sleeves too thin on the outer shell area. I know you have had luck but your build is way over the top for my budget. How's the car been running for you?

Last edited by pddvl1; 07-05-2008 at 01:39 PM. Reason: spell checked
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Old 07-05-2008, 03:18 PM   #25
kyleblix
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Quote:
Originally Posted by flycaster View Post
Jeeeze...first Clark, now Jarrad? Since when did PDX go back to recommending Mahles? A year ago it was CP, period, after they had several Mahle 4032's break.

I assume this is the new 2618's, yes? And if you don't know, ask 'em if you don't mind. I'm curious.
yes the 2618's
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