More cam questions: 256's and turbo

964 Views 16 Replies 10 Participants Last post by QuickBlackGTi, Dec 3, 2001

MYK

Discussion Starter · Nov 28, 2001

Hey guys, i tried a search cause I think this has been gone over but i can't find it. I am thinking of switching from my Schrick 268's to DSR 256's. I want to go turbo but not quite yet. In the meantime I don't want to go back to stock cams. Will a turbo work with 256 cams? I know you can run a charger with them. I may just wait and change them when I do the turbo, and trade the 268's for 248's. Also if I change my cams, I'm not sure if my car has HD or high lift springs. The cams where in my car when I bought it. If they do have HD or high lift springs, will this cause any problem with the stock cams or 256's? I heard you could lose power but it may not be noticeable. let me know....late
myk

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Ed Casey

· #2 · Nov 28, 2001

Re: More cam questions: 256's and turbo (MYK)

The DSR work fine with turbo, the 248s work better. Hold onto the 269s until you are ready to go FI. Then get the 248s. If you had stock cams and were looking for an NA upgrade you could keep when going FI the 256 make sense, but why sells the 268s, take a loss, buy 256s, then sell them and take a loss, then get 248s. (IMHO) I went from stock to 256s, got 248s, but am back to NA with the 256s.. boy lotta numbers in there

Oh yeah the HD springs (tt?) won't cause any issues. Neither will Ti retainers.
Ed-92SLC

[Modified by Ed Casey, 10:24 PM 11-27-2001]

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MYK

Discussion Starter · #3 · Nov 28, 2001

Re: More cam questions: 256's and turbo (Ed Casey)

Sounds about right. I will just chill until the turbo money is there. If nothing else shouldn't be a problem trading someone for some stock cams or 248's when the time comes. The only reason i was thinking about the 256's was because i thought maybe I would get a Z charger with the Z charger/256 Garrett chip. Probably wouldn't be enough power though for me. And then I'd have to scrap everything all over again.
myk

climbingcue

· #4 · Nov 28, 2001

2

Re: More cam questions: 256's and turbo (MYK)

When I talked to Matrix about the DSR 256 cams they said that they work great with turbo just make sure that you get the 118 lobe centers.....
I am still waiting for my set to come to my house

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graff48

· #5 · Nov 28, 2001

Re: More cam questions: 256's and turbo (MYK)

quote:[HR][/HR]Also if I change my cams, I'm not sure if my car has HD or high lift springs. The cams where in my car when I bought it. If they do have HD or high lift springs, will this cause any problem with the stock cams or 256's?
myk[HR][/HR]

I've heard that DSR 256's don't work well with HD valve springs. If I were you, I'd buy some stock valve springs and install them with the cams. It would kind of suck to have the cams installed with your current springs, have the car run like sh1t, then have to tear the motor down again to replace the springs. If you're not doing the install yourself, it's gonna cost you $350 each time.
At the very least, talk to DSR and get their opinion.

Climbingcue - what so special about the 118 lobe centers?

1BadAzzVR6

· #6 · Nov 28, 2001

Re: More cam questions: 256's and turbo (graff48)

i might go FI in the near future .. whats ppls experiences with cams and FI on a MK3?

graff48

· #7 · Nov 28, 2001

Re: More cam questions: 256's and turbo (1BadAzzVR6)

268's: Good for NA cars.
248's: Good for FI cars.
256's: Good for both NA and FI cars.
stock: Good for nothing!

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1BadAzzVR6

· #8 · Nov 29, 2001

3

Re: More cam questions: 256's and turbo (graff48)

quote:[HR][/HR]
stock: Good for nothing!

[HR][/HR]

hahahahah http://****************.com/smile/emthup.gif http://****************.com/smile/emthup.gif

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coldbanana1

· #9 · Nov 29, 2001

Re: More cam questions: 256's and turbo (MYK)

Stock cams are great for the smoothest idle....haha

BLACKVR

· #10 · Nov 29, 2001

Re: More cam questions: 256's and turbo (coldbanana1)

I had 268s and 256s now I have stock.The car runs best with the stock cams with the turbo setup.My car idles good and can also go 11s.I wouldnt waste the money save it for pistons.Your not gonna run 40hp from the cams so why waste your time.If you got the stock cams put them in when your ready and sell the 268s.Trust me it will be the smartest move.BTW My car made more power with the 268s when it was NA

climbingcue

· #11 · Nov 29, 2001

Re: More cam questions: 256's and turbo (coldbanana1)

When I called Matrix to ask about the 256 cams they told me to make sure that I got 118 lob center..... You would have to ask Matrix what makes them special..... I would guess that the profile works better with FI, but that is only my guess.....

GolfII VR6

· #12 · Dec 2, 2001

Re: More cam questions: 256's and turbo (climbingcue)

I asked that question too about the DSR 256 normal cams with the DSR 256 with the 118 center lobe cams, this is what Dick Chiang whose work at the DSR, the follwoing is what he response to my question from the e-mail:
"VW actually has a few different lobe centers that they use. Idle quality is fairly similar though. The earlier the power comes on, the more larger the centers you want to use. The mild overlap of the 256 grind relative to an radical N/A cam makes the 256's suitable for FI. But, for tuning reasons, focus on the powerband and pick the greater overlap versions for HP generated above 4000 rpm and the lower overlap for high torque generated below that."
Hope this will help

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benzivr6

· #13 · Dec 2, 2001

Re: More cam questions: 256's and turbo (GolfII VR6)

Will the HD valve springs have any negative affect on the stock, DSR 256,248 cams if you leave the HD springs in the head?

QuickBlackGTi

· #14 · Dec 3, 2001

Re: More cam questions: 256's and turbo (benzivr6)

I thought it would be better to run with HD springs if you use FI? Since you are forcing the engine to produce more power then normal, it would seem logical to use HD spring so that the valves open and shut faster. I can see not using them if yuou go N/A but i can with FI. Can anyone explain why not to use them when running FI? THX

graff48

· #15 · Dec 3, 2001

Re: More cam questions: 256's and turbo (QuickBlackGTi)

quote:[HR][/HR]I thought it would be better to run with HD springs if you use FI? Since you are forcing the engine to produce more power then normal, it would seem logical to use HD spring so that the valves open and shut faster. I can see not using them if yuou go N/A but i can with FI. Can anyone explain why not to use them when running FI? THX[HR][/HR]

I think you misunderstood me. My point is that DSR recommends using the stock vavle springs with their cams, regardless if you are NA or FI.

BLACKVR

· #16 · Dec 3, 2001

Re: More cam questions: 256's and turbo (graff48)

I agree with Quickblackgti.The valves springs will help with FI regardless if you got cams or not for the exact reason he stated.I never saw any big numbers come out of a DSR cam with a turbo setup.I had them when I was NA and i think they were a waste of money my car was faster wit 268s.If your gonna go turbo then the turbo itself will produce more than enough power.If you want more then build the bottom end and turn up the boost.I cant see you spending money on something that will maybe give you 20 hp.I run consistant 11s on a bone stock motor and all I did was put in a copper gasket and a bolt on turbo kit.Im not ranking down DSR im just stating the truth and dont like to see people throw away there money.
Brian

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QuickBlackGTi

· #17 · Dec 3, 2001

Re: More cam questions: 256's and turbo (BLACKVR)

Blackvr
So you are saying not to even get different cams when running FI? I am planning a full motor build from the bottom end up. The car will be FI but not right away. You think it will be worth the extra money buying new cam when doing this? Or stick with the stock cams? Another thing is the valve duration they are open. If you have a more of a lobe than a real peaky cam like the 268 the HD spring might not be needed. But then it all comes back to having FI and reving the motor higher than normal. Thats where the HD spring would help the valves more. That just point of view.

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