i think 50whp would be asking alot, but you never know. I would expect at least 30whp and would be dissapointed if it was less. This is what i am trying to find out also.

Thanks, have any of them done back to back dyno tests?

 

I will get Greg GSC to input here in the morning My brain is fried from a grumpy wife all day

 

thats never a great thing. gsc s2s will work well.

 

FYI, Al is not on the Buschur payroll, AFAIK. Both he and Dave, each in his own right, has earned the full respect of the Evo community.

They are both topnotch tuners and racers who have made significant contributions to making our Evos go fast. I admire both of these gentlemen, and in fact, I only wish that there were a bunch more like them.

Why do you as an individual, feel the need to belittle the accomplishments of a tuner/racer like Al? I don't know the guy personally but it just bugs me when guys like you make these indirect, anonymous personal attacks.

Hey, if you've got a bone to pick with the man, then send him a PM. Otherwise, lighten up!

 

Jun messures there .040 @ the Valve our listed numbers are at the cam. Reason we use the cam number rather than the valve is do to the hydralic lifter and how it can have some slop and adjust by a few degree's on it's own. If we were to set it up with a solid lifter (which shouldnt be run on our non solid profiles) or just using mathmatic's with out taking into account the lifter slop. our number on the S2 would be a 232. the S3H is a 238.

So for the Evo 8
S2
Intake
274 11.2mm 232@.040" Duration(at the valve) Centerline 107
Exhaust
274 11.0mm 232@.040" Duration(at the valve) Centerline 113

S3H
Intake
280 11.50mm 238@.040" Duration(at the valve) Centerline 107
Exhaust
280 11.50mm 238@.040" Duration(at the valve) Centerline 115

So the JUN 272 10.8mm camshaft set is actually milder than our S2. our S2 will idle better and have a smoother power curve but that has to do with our Lobe design, ramp rates and grinding style.

For the evo 1-3 we have
6003S2
Intake 274 11.00mm 232@.040" 107 Centerline
Exhaust 274 11.00mm 232@.040" 113 Centerlined

we can also cut any of the Evo 8 profiles on the evo 1-3 core. The stock head is ok to use on the S2 for the 1-3 just make sure you run an upgraded valve spring with a seat pressure of 80 or more. some of the crower springs are 50-65 and need to be avoided.

 

Thankyou Greg for taking the time to post that info

So your S2 for the Early head will make same/simalar power to the JUN 272 but be smoother? How so?

Any difference between the EVO1-3 profiles and the EVO8 profile except for the lift?

How much power will the S2's make over the HKS 272?

 

bump for answer. Going to order the S2's today.

 

The lobe design is different obvously between the GSC and Jun, the Jun cams are a little ruffer on the valvetrain do to the ramp design and opening and closing speed. this also makes them a little tougher to tune and effect how smooth they run.

the evo 1-3 head doesnt flow as well as the evo 8 so we can't go as far with it stock. so the difference lies in the lift on some and the 1mm on other profiles.

I have a dyno graph of an untuned set of S2s on a 67mm turbo on a DSM/evo1-3 compared to a set of the HKS 272s. The difference is 61whp @ 25psi at peak. We could have found a little more but the oil pump on the car let go so we couldn’t finish tuning her. Damn stubby balance shaft removal kit. On the 67mm turbo i would bet 70whp with close to the same spool characteristics. On a smaller 35r i would say 40-50whp over the HKS. Jun I would put very close maybe 5-10whp difference. Jun knows what he is doing hks has been blown out of the water by its competitors.

 

thankyou. pm sent.

 

Hey Greg

When you say there would be 5-10hp difference between the S2's and the JUN's, is that in favour of the S2's?
Also, what would be the difference in the midrange between the two?

Thanks

 

Yes in favor of the S2 as it is a more aggressive camshaft. As far as midrange and low end power our lobe design is what really makes the tq and midrage power numbers for us. What the exact difference will be is something i dont have hard facts on so i can't say exactly.

 

Greg, I'm not sure how to address this question without stating it outright. When I tested the JUN's vs the HKS on the Buschur Dyno, I found that with same tune and boost levels, I had substantially more torque from 3000 rpm's and up. The JUNS simply made more power than the HKS's down low. Are you saying that the S2's would have made more than my dyno'd 513 wtq by 3850 rpms? I have no allegiance to JUN's, but the power increase was so unexpected that it's hard to believe the S2's could have made more. I believe that our 513 wtq is the highest made on a Mustang dyno, using the FPGreen turbo. If your S2's make more power down low and mid-upper rpms, I would love to have tested them at the same time. Maybe I need to revisit the dyno with a different set of cams?

 

what was the increase over the hks and were they hks 272

 

If you look at the following chart, you can see my exact results comparing the HKS 272 unported head to the HKS 272 ported head and then the HKS 272 ported head to JUN 272 ported head. + or - is percentage of increase or decrease in Mustang Dyno measured power and torque. The JUN's showed 50 whp gain at 8000 rpms over the HKS 272's, both cams were on same boost, but maxed out tunes, same fuel, etc. The early torque is what I was questioning vs an S2.

 

am I missing the 50whp I only see about 10whp from 272 hks ported head to jun ported head.... I am try to compare stock head hks 272 to stock head s2. I assume if the jun out performed the hks the s2 would to but by howmuch is key.