Got Over 400kw Atw?

[IMPORT CENTRAL]

685 awhp rb26 with jun 2.7 stroker pump fuel 1.8 bar jun 280 cams and head gear twin trust td06-20g

[RRob]

you guys made more power lately??

http://www.antilag.com/power.htm

Yer i have actually chief.

pic

[R32-GTS]

Rb26 stock crank

272 10.2 HKS Cams

Garrett t04z

27psi

454rwkw

[DCIEVE]

Yes, Scali has retuned mine with bigger injectors. Has made more power but cannot be f**ked updating sig/leaderboard etc.

Back in your box.

lol bit sensitive? Was a question, not a dig.

rb26

260 9.15 tomei

gt35

1.6bar

435kw hd

[T04GTR]

nice, keep em coming.

[T04GTR]

you know

i think i know.... but im trying to work out what do do cams wise.. regular normal 270~ or really big. but i wont be revving past 8500.

[rob82]

lol bit sensitive? Was a question, not a dig.

rb26

260 9.15 tomei

gt35

1.6bar

435kw hd

435kw out of GT35?????

[Swiper the Fox]

i think i know.... but im trying to work out what do do cams wise.. regular normal 270~ or really big. but i wont be revving past 8500.

big lift 270's my friend for that rev range...wouldn't go any more deg than that.

Tomei 272 10.8's would be my pick or the JUN 272 11.35's. They are 29mm BC though and need the thicker buckets and id recommend titanium retainers as well.

Im doing a real nice head combo for a fella at the moment that would suit you well.

Edited January 10, 2009 by DiRTgarage

[Risking]

big lift 270's my friend for that rev range...wouldn't go any more deg than that.

Tomei 272 10.8's would be my pick or the JUN 272 11.35's. They are 29mm BC though and need the thicker buckets and id recommend titanium retainers as well.

Im doing a real nice head combo for a fella at the moment that would suit you well.

The JUN cams are the shit for nicely ported heads. Besides the initial set-up costs like Paul mentioned making it expensive they are worth using.

We settled for a little more lift after alot of flow bench R&D, but I was really happy with the 272/11.35.

I believe Charlie may have another set with springs and retainers Dave same as the ones I got from him??

[Swiper the Fox]

The JUN cams are the shit for nicely ported heads. Besides the initial set-up costs like Paul mentioned making it expensive they are worth using.

We settled for a little more lift after alot of flow bench R&D, but I was really happy with the 272/11.35.

I believe Charlie may have another set with springs and retainers Dave same as the ones I got from him??

Dave i believe we have a winner.

[DCIEVE]

435kw out of GT35?????

been discussed plenty in the 35r vs t04z thread, have a look if your interested.

[Cartman]

Dave i believe we have a winner.

is the profile of the jun cams compared to the tomei's really that much better suited to a well ported head with oversize valves?

[Risking]

Paul may have different comment but from out my testing with a flow bench we found.

The tomei's outdid the JUN cams when the ports were only slightly opened and the exhaust hump was left in place.

On this same combination the testers opinion was drop in Tomei's would be better again.

With the ports done the way the machinist wanted and obviously the hump removed the JUN cams came back.

We then started with another head, oversized valves and appropriate porting to suit (port design can vary for larger valves)

The JUN cams were marginally better than the Tomei's. So much so that like I mentioned the expense of setting them up with buckets etc is worth while.

We cam doctored both inlet and exhaust cams from both brands, so the actual profiles could be seen easily. I have the results on my laptop which I can post up latter.

Like paul said they are a 29mm base circle so you need to either use a thicker shim or preferably proper buckets.

Head also obviously needs to be relieved and we made up new spring seats to set tension and provide and stronger seat.

We never actually made any real world comparisions as the engine was built with the best tested components and in the end neither the JUN or Tomei's were used we made our own from the testing we did with the others.

Another cam worth looking at is the Apexi Vmax 272/11.3 Again they are a 29mm base circle but I have had these in an engine and they were a really good thing. I still have them here, think they also came from Charlie originally.

Edited January 10, 2009 by Risking

[Swiper the Fox]

Paul may have different comment but from out my testing with a flow bench we found.

The tomei's outdid the JUN cams when the ports were only slightly opened and the exhaust hump was left in place.

On this same combination the testers opinion was drop in Tomei's would be better again.

With the ports done the way the machinist wanted and obviously the hump removed the JUN cams came back.

We then started with another head, oversized valves and appropriate porting to suit (port design can vary for larger valves)

The JUN cams were marginally better than the Tomei's. So much so that like I mentioned the expense of setting them up with buckets etc is worth while.

We cam doctored both inlet and exhaust cams from both brands, so the actual profiles could be seen easily. I have the results on my laptop which I can post up latter.

Like paul said they are a 29mm base circle so you need to either use a thicker shim or preferably proper buckets.

Head also obviously needs to be relieved and we made up new spring seats to set tension and provide and stronger seat.

We never actually made any real world comparisions as the engine was built with the best tested components and in the end neither the JUN or Tomei's were used we made our own from the testing we did with the others.

Another cam worth looking at is the Apexi Vmax 272/11.3 Again they are a 29mm base circle but I have had these in an engine and they were a really good thing. I still have them here, think they also came from Charlie originally.

Nah that pretty much sums up what we found also...for example on our stage 2 heads we use Tomei and on our stage 3 big $$ heads we use JUN. We couldn't believe how well the big JUN items woke the engine up and actually had it making more power earlier with the big port head. This is something that totally goes against the theory of what should be occurring, but boosted engines do funny things that are actually the opposite of what you would find it if was an NA.

JUN recommend running a thicker shim but this is something i strongly disagree with, the Tomei buckets are definately the way to go, as the shim should be kept around or under 3mm thickness to be safe.

But sometimes people who we do them for have their own ideas and we will advise them but at the end of the day its their money and they can spend it the way they choose to.

Risking why do we freely give away info that both you and i know cost us 1000's to discover?

We are either very generous or mad!

Edited January 11, 2009 by DiRTgarage

[T04GTR]

The JUN cams are the shit for nicely ported heads. Besides the initial set-up costs like Paul mentioned making it expensive they are worth using.

We settled for a little more lift after alot of flow bench R&D, but I was really happy with the 272/11.35.

I believe Charlie may have another set with springs and retainers Dave same as the ones I got from him??

hahahah yeah you beat me to it, i rang him up and he was "i sold them yesterday.. lol

yeah sweet. already got the buckets. (for labour incured but not paid for....)

[T04GTR]

yeah. thats the conflicting thing. bigger duration giving more bottom end than a smaller duration...

the head has alll the runners smothed out on the short radius and the bowl has been smothed and the exhaust port has the hump removed aswell as the hump above the guide, would be nice to raise the port but i dont have the time or skill and a suitable welder..

also the squish pads have been removed on both inlet and exhaust. (smothed into the chamber not completly removed)

using standard valves.

my turbo will be "on song" around 5k (35pound) and will be reved to 8500. (want to save the oil pump)

[Risking]

Nah that pretty much sums up what we found also...for example on our stage 2 heads we use Tomei and on our stage 3 big $$ heads we use JUN. We couldn't believe how well the big JUN items woke the engine up and actually had it making more power earlier with the big port head. This is something that totally goes against the theory of what should be occurring, but boosted engines do funny things that are actually the opposite of what you would find it if was an NA.

JUN recommend running a thicker shim but this is something i strongly disagree with, the Tomei buckets are definately the way to go, as the shim should be kept around or under 3mm thickness to be safe.

But sometimes people who we do them for have their own ideas and we will advise them but at the end of the day its their money and they can spend it the way they choose to.

Risking why do we freely give away info that both you and i know cost us 1000's to discover?

We are either very generous or mad!

I know what your saying there Paul..

I have lost count of the R&D dollars I've spent. (shudder to think actually). Lattely we've pushed engines to breaking point on the engine dyno just to try something different. Had mixed results but learning what will and wont work along the way.

yeah. thats the conflicting thing. bigger duration giving more bottom end than a smaller duration...

the head has alll the runners smothed out on the short radius and the bowl has been smothed and the exhaust port has the hump removed aswell as the hump above the guide, would be nice to raise the port but i dont have the time or skill and a suitable welder..

also the squish pads have been removed on both inlet and exhaust. (smothed into the chamber not completly removed)

using standard valves.

my turbo will be "on song" around 5k (35pound) and will be reved to 8500. (want to save the oil pump)

We keep squish bands on all heads, They are slightly revised in shape but always remain.

Again alot of flow bench testing and gradual shaping of the bands gave us the best possible results from the cams we used.

Some like to remove them on big boost engines but each to their own I guess.

Are you going to retain the standard valves??

[Swiper the Fox]

I know what your saying there Paul..

I have lost count of the R&D dollars I've spent. (shudder to think actually). Lattely we've pushed engines to breaking point on the engine dyno just to try something different. Had mixed results but learning what will and wont work along the way.

We keep squish bands on all heads, They are slightly revised in shape but always remain.

Again alot of flow bench testing and gradual shaping of the bands gave us the best possible results from the cams we used.

Some like to remove them on big boost engines but each to their own I guess.

Are you going to retain the standard valves??

We keep the quench areas on the stage 2's but on the stage 3's we remove one side (wont give away which side on here ive said enough) but this is suited to big boost big horsepower set-up's only i.e. drag engines or dyno queens.

[shanef]

The JUN cams are the shit for nicely ported heads. Besides the initial set-up costs like Paul mentioned making it expensive they are worth using.

We settled for a little more lift after alot of flow bench R&D, but I was really happy with the 272/11.35.

I believe Charlie may have another set with springs and retainers Dave same as the ones I got from him??

too bad their springs are shit

[Swiper the Fox]

too bad their springs are shit

ive seen them go over 10500rpm constantly and never had a problem with them. I personally have ran them over 9500rpm nearly everytime i start my race engine and they free length and compession tested like new items on strip down.

something a bit more enlightening than saying something is shit would be appreciated.

maybe sometimes items are only as good as the way they are set-up/assembled