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Old 07-30-2014, 06:50 PM   #451
user1029
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Originally Posted by Zee Biker View Post
Are you saying the vast majority of people are better off with stock 257 cams?
You might be happy with your stock cams right meow but sooner or later you will want more power, so go big when you have the motor out.
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Old 07-30-2014, 07:03 PM   #452
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Originally Posted by Zee Biker View Post
Are you saying the vast majority of people are better off with stock 257 cams?
For a bunch of reason, imo, yes. If you have an auto drag race car or an all out big turbo, then no. I say this because often, people don't have the right backpressure:boost or mani pressure to even make power up top, which is why they think they need cams. Ej257 cams don't mean that you can't rev high and still make big power towards redline. I can list off a bunch of further reasons, but it becomes more complex and muddy's up the point. The stock cams with a good tuner mapping avcs will come on early and if you have the right turbine wheel/housing, you will be making big power up top. Want more power, is that one's argument for cams? Well, you got the fuel? You have the intercooler? Crank the boost..bam, more power.

I advise cams if your turbo is so large in comparison to your CI's that your power is ALREADY all the way to the right. Your normal 60+mm wrx doesn't fit that category.

Last edited by CatfaceType-R; 07-30-2014 at 07:08 PM.
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Old 07-30-2014, 07:52 PM   #453
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ugh..
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Old 07-31-2014, 07:44 AM   #454
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Originally Posted by CatfaceType-R View Post
For a bunch of reason, imo, yes. If you have an auto drag race car or an all out big turbo, then no. I say this because often, people don't have the right backpressure:boost or mani pressure to even make power up top, which is why they think they need cams. Ej257 cams don't mean that you can't rev high and still make big power towards redline. I can list off a bunch of further reasons, but it becomes more complex and muddy's up the point. The stock cams with a good tuner mapping avcs will come on early and if you have the right turbine wheel/housing, you will be making big power up top. Want more power, is that one's argument for cams? Well, you got the fuel? You have the intercooler? Crank the boost..bam, more power.

I advise cams if your turbo is so large in comparison to your CI's that your power is ALREADY all the way to the right. Your normal 60+mm wrx doesn't fit that category.
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Old 07-31-2014, 08:14 AM   #455
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Ugh, I hope you guys aren't scoffing on the info; ya'll need to read more, come into the light, there's books on this stuff.
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Old 07-31-2014, 08:23 AM   #456
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true, we've just got a 550 horsepower car on stock cams, and another pushing 600.

cams aren't a necessity, but they do help when you're getting to the 600 number.
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Old 07-31-2014, 08:30 AM   #457
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Default Wow!

I had no idea that cams came in such varying qualities.
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Old 07-31-2014, 08:31 AM   #458
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Default Manufacturer?

Can anyone recomend a quality manufacturer or supplier?
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Old 07-31-2014, 12:07 PM   #459
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Quote:
Originally Posted by CatfaceType-R View Post
If so, wpc the buckets
Quote:
Originally Posted by DisoDisp View Post
true, we've just got a 550 horsepower car on stock cams, and another pushing 600.

cams aren't a necessity, but they do help when you're getting to the 600 number.
Have graphs of the torque curves?
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Old 07-31-2014, 12:23 PM   #460
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Ofcourse:

550ps 2.5l STi

received_m_mid_1406823190240_3633defc59516c9250_0 by DisoDisp, on Flickr


599ps 2.0l STi

kimmo_dyno_2012 by DisoDisp, on Flickr

Both on 100% stock OEM heads.
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Old 07-31-2014, 12:30 PM   #461
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well that's power without engine speed, so I can't calculate torque...makes it kind of hard to analyze
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Old 07-31-2014, 12:54 PM   #462
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Dynod in 5th IIRC you can calc rpm based on gear ratios.

Don't recall the 2.0l redline, possibly 8k.
2.5l redline at 7600rpm iirc.

Last edited by DisoDisp; 07-31-2014 at 01:23 PM.
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Old 07-31-2014, 02:32 PM   #463
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kilo...whatt?
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Old 07-31-2014, 09:26 PM   #464
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Very nice, thanks for actually providing information



Quote:
Originally Posted by DisoDisp View Post
Ofcourse:

550ps 2.5l STi

received_m_mid_1406823190240_3633defc59516c9250_0 by DisoDisp, on Flickr


599ps 2.0l STi

kimmo_dyno_2012 by DisoDisp, on Flickr

Both on 100% stock OEM heads.
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Old 08-01-2014, 08:58 AM   #465
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Originally Posted by DisoDisp View Post
Dynod in 5th IIRC you can calc rpm based on gear ratios.

Don't recall the 2.0l redline, possibly 8k.
2.5l redline at 7600rpm iirc.
Yes, I could if I knew exactly what RPM you stopped the pull, gear ratio of 5th and the diff and then knew tire size...I could be in the ballpark.
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Old 08-01-2014, 09:51 AM   #466
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I am sure Dom and I will have lots of information here in the next few months as I have just ordered a set of Tomei Procams for my 2.34lr build to see how they perform.
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Old 08-01-2014, 12:56 PM   #467
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Stock 06 STi driveline, 7600rpm, 235/40/R18
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Old 08-01-2014, 06:43 PM   #468
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I just was talking with gsc about a set of cams for our drag car and it sounds like they have some billet cores coming in a couple months. Sounds promising to me that they are trying to make a better product then whats on the market now. They reply fast to my questions and have been great to work with thus far. I cant wait to try a set on our car. Hopefully i get in on the first couple sets to try these out. Not sure how much info i will be able to give you guys with it being a drag motor and most likely it will be apart more then it runs but I will post up once I get a set in hands.

Matt
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Old 08-01-2014, 08:40 PM   #469
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When they fail they won't be so nice to work with, I can tell you from experience

P.s if you need billet cams they can be had also.
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Old 08-03-2014, 02:11 PM   #470
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Originally Posted by Homemade WRX View Post
Yes, I could if I knew exactly what RPM you stopped the pull, gear ratio of 5th and the diff and then knew tire size...I could be in the ballpark.
If you know what RPM the pull stopped at, you would only have to rescale the X-axis to make it show RPM.

Seems like dynoing in 5th would do weird things to the shapes of the curves though, due to the amount of time it takes to crawl through the rev range.

My 5th gear road pulls look fabulous (other than letting off early) but the graph doesn't tell you that it took half an hour to get from 2500 to 4500.
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Old 08-03-2014, 05:42 PM   #471
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Originally Posted by DisoDisp View Post
When they fail they won't be so nice to work with, I can tell you from experience

P.s if you need billet cams they can be had also.
yeah for like $fifteen hundred+ EACH.
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Old 08-03-2014, 05:59 PM   #472
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More like 2500 a set.
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Old 08-03-2014, 09:44 PM   #473
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TiC... some numbers.

- initial bucket measurements were taken with heads torqued to block
- New subaru 438 buckets (thinnest) were used as reference buckets.
- Initial gap measured to the 10 thousandth.

Numbers are from cam gear to firewall
LH head
Initial values
Cyl 2 In 0.009", 0.010"
Cyl 4 In 0.010", 0.010"
Cyl 2 Ex 0.012", 0.012"
Cyl 4 Ex 0.011", 0.011"

Values @ 200 miles on break in
Cyl 2 In 0.010", 0.011"
Cyl 4 In 0.0115", 0.011"
Cyl 2 Ex 0.0125", 0.013"
Cyl 4 Ex 0.013", 0.013"

RH head
Initial values
Cyl 1 In 0.008", 0.009"
Cyl 3 In 0.009", 0.010"
Cyl 1 Ex 0.011", 0.011"
Cyl 3 Ex 0.011", 0.012"

Values @ 200 miles on break in
Cyl 1 In 0.0135", 0.0095"
Cyl 3 In 0.010", 0.011"
Cyl 1 Ex 0.012", 0.012"
Cyl 3 Ex 0.013", 0.0135"

Parkerizing still seems to remain as they do not look polished at all.

Last edited by Justin V; 08-05-2014 at 07:42 AM.
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Old 08-04-2014, 09:37 AM   #474
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Quote:
Originally Posted by Justin V View Post
TiC... some numbers.

Only complete for LH head
- initial bucket measurements were taken with heads torqued to block
- New subaru 438 buckets (thinnest) were used as reference buckets.
- Initial gap measured to the 10 thousandth.

Numbers are from cam gear to firewall
Initial values
Cyl 2 In 0.009", 0.010"
Cyl 4 In 0.010", 0.010"
Cyl 2 Ex 0.012", 0.012"
Cyl 4 Ex 0.011", 0.011"

Today's values 200 miles on break in
Cyl 2 In 0.010", 0.011"
Cyl 4 In 0.0115", 0.011"
Cyl 2 Ex 0.0125", 0.013"
Cyl 4 Ex 0.013", 0.013"

Lobe shape is fine. Parkerizing still seems to remain as they do not look polished at all.
Very cool. Thank you.
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Old 08-04-2014, 10:28 AM   #475
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Quote:
Originally Posted by Justin V View Post
TiC... some numbers.

Only complete for LH head
- initial bucket measurements were taken with heads torqued to block
- New subaru 438 buckets (thinnest) were used as reference buckets.
- Initial gap measured to the 10 thousandth.

Numbers are from cam gear to firewall
Initial values
Cyl 2 In 0.009", 0.010"
Cyl 4 In 0.010", 0.010"
Cyl 2 Ex 0.012", 0.012"
Cyl 4 Ex 0.011", 0.011"

Today's values 200 miles on break in
Cyl 2 In 0.010", 0.011"
Cyl 4 In 0.0115", 0.011"
Cyl 2 Ex 0.0125", 0.013"
Cyl 4 Ex 0.013", 0.013"

Lobe shape is fine. Parkerizing still seems to remain as they do not look polished at all.
The two numbers are because you took a measurement from each end of the cam lobe?
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