Hey guys - for months after the testing i did on my own evo I have been saying that the HKS 264 and 272 are virtually identical in hp and that there was only 3 or 4 whp between them

I have been suggesting the 264 becuase of the vastly smoother idel

BTW - this recomendation has been applicable to stock turbos and stock engines only under 8,000 rpms

I based this opinion on my own reserach testing 8 different cams on my own evo

Today - I have new light to shed on the comparison

Here we have two dyno exmples with power IDENTICAL in the whp area on very similar evos with stock fmic's and the Dyno Flash Fireball 3 - over all two very smooth curves

NOW - we see some difference between the two cams

The 264 makes more trq early at the onset and for the first 100 rpms or so - this is by only a few ft lbs - the whp up top is identical

The 272 cams seem to make the same whp - but don;t some on with the initial boost as hard - loosing 3 ft lbs and at the first 100 rpms of the boost spike

After that the 272's clearly hold the trg curve much better up on top in the power band and don't fall down on trq as fast at the very top as the 264

Through much of the middle the trq is identical between the two after the initial thrust from the 264

Although this is not a perfect labratory like A - B test as I would like - it does shed some more information for those who are making the comparsion as the whp curves on these two cars are virtually identical - BUT the trq curve can bee seem to be holding out better with 272 on top in the high rpms area - even though the horse power is the same

On a drag track the 272 will get the edge when you are mostly in the high rpms range - but IMHO in the street use you will hardly notice any difference

I still prefer the 264 on a street driver due to the better idel and drivability - just my opinion

BTW - I run Jun 264

Just some info to digest

And . . . . if I don;t say so myself - some very impressive and solid numbers for stock fmic cars and the Fireball 3 tecnology Dyno Flash is super, super smooth and even better when behind the wheel

 

other

 

so more duration=more torque

 

My view - is its moving the trq advantage from the first few hundred rpms at spool up and taking it over to the last few rpms before red line

Just my view of the sheets and I am certainly open to suggestions on other ways of looking at this data

 

Haven't you tested the majority of the camshafts out there? I'm sold on HKS's solid reputation for producing a camshaft that is ground "to center" and lives 1000's of miles while doing the daily grind (daily driver). Not doubting the JUN or TOMEI's but they've got a little less exposure here in the US.

The JUN and TOMEI offerings seem to have a totally different cam profile than the HKS cams which is evident by both the difference in the advertised duration and lift. I've got cam cards for the HKS's but I'd be interested to take a peak at the JUN and TOMEI cards to compare. Anyone have them they could scan/photo?

Anyway.. I'm curious to know what your testing has shown with the different cams in both stock turbo and aftermarket turbo applications. While its doubtful we'll ever have the "perfect world" test conditions and true back to back tests, I'd be satasfied with just your thoughts and perhaps some dyno charts. Just to get an idea of the shape of the powerband with the various cams.

New topic?

 

Most of not all of my testing on cams was on the stock turbo and engine set up

Since i tried the JUN 264 - i am simly in love with them and would not consider anything else

Comparing the HKS to the JUN is like comparing a BB Gun to a shotgun - IMHO

I realize that supply issues and extra cost make these cams much less popular than the HKS - but they are superior

BTW - I would not suggest the JUN 272 to anyone who is not building anything buy a straight out race application

Anyone who has driven in my car can chime in to attest that my car feels more like a ninja motorbike than any car - it pulls super hard and flat from 7,000 to 9,300 rpms - of course my specially speced Dyno Flash heads have a lot to do with that, however none of it would be possible without the JUN 264 cams

 

Can you share any info on the powerband differences, comparing the HKS offernings and JUN 264's?

 

Any conclusions on 264/272 combos?

 

I dont think Al had any cars there yesterday on the dyno with the
combo of 264/272,but then again I didn't stay all day.

 

None. The WHP was also identical to the 264/264 and 272/272 when i tested with my stock engine and turbo

I wish i could go back and exmaine the trq figures - BUT there was a timne period there when I was doing this and the tach signal was not operational on that dyno so there is no trq numbers

IMHO - which ever c0ombination you choose - they all make about the same power in whp under 7500 with stock turbo

the 272 gives up a bit of low end trq for more top end pull gains towards red line at the xpesnse of a rougher idel and mose stalling issues

IF you get a upgrade turbo then the 272 would be THE way to go for sure

On the stock turbo - I still recomend the HKS 264 / 264 simply for the much more liveable idel and driveabilityu when going in stop and go traffic

BTW - with the new Fireball 3 technology BOTH these evos were a blast to drive and felt more like normally apserated 6 cyln BMW's in the way they pulled than 4 bangers with turbos. They booth were totally flat, smooth and linear in the power band. The Dyno Flash is now feeling more like a Porsche factory ecu tune than a safretmerket "hop up" product tune.

 

Thanks again Al,the car is smooth as glass,pulls from idle all the way to rpm cut.The unfortunate thing is I have not found any victims in 2 days since. My kids love it though One question,can you do anything with the speed cut? 160mph, and she still has 900 rpms to go?WTF

 

oK man - I will take your speed limiter higher - i am osrry about that - its my bad - i must have overlooked it when i was making your base flash I used - it can be fixed easily when I see you next

 

9300rpm?

 

I have hit 10,000 rpms many many times

 

I had AL street tune my car with the 264i/272e cams....I loved the way it pulled! It feels really good and very strong now. It's nice and smooth...and the idle is really good!

AL...hope my flash maps helped you out with your testing in some way! Thanks again for the awesome flash bro!!!