vr6 surpercharger cams?

[J4Y VR 36]

Hi guys I got a Vortech v1 charger I’m looking to get a set of cams which cams would you suggest I go for? My set up is 6 six branch manifold power flow exhaust Bosch 440cc green top injectors and 2.5in pulley.

[russj249 2]

I was always under the impression that a 268 is best for supercharge, even though a 263 would be better for a turbo, because of there being no back pressure in a charger setup, it would effectively blow boost out he exhaust.

Have you done a search as its been covered many times, but also sure some charged guys will be here soon to answer a better answer than me!

[Ben Seabrook 4]

263 is the best mate ran them on both my last charged cars and they are great really compliment a charger

[DrRich 1]

I think Ben and russj are correct here. I've got a Rotrex with the Schrick 268's still in and although there's a nice pick up at 4000rpm, my wideband shows lean at moderate throttle opening (ie not enriching as much as at WOT).

I've been reading around a bit and it seems that overlap is undesirable on any supercharged cam (as russj says, boost blows some of your mixture straight out the exhaust valve), so when I get home I'm planning on swapping the standard cams back in.

Most of the forums seem to agree that the Schimmel and Autotech 263's are good for boost, and Schrick sell their 268/264 grind for FI applications (but they are of course, expensive...).

[J4Y VR 36]

thanks for the info looks likes I'll be saving for the cams! unless anybody got a used set for sale?

[Selfmade408 0]

I have 268s on my stage 2 v9. I made 250hp and 206tq with some possible leaks.

[FishWick 21]

I was always under the impression that a 268 is best for supercharge' date=' even though a 263 would be better for a turbo, because of there being no back pressure in a charger setup, it would effectively blow boost out he exhaust.

[/quote']

Yeah, turbos have massive back pressure and you get a different problem: intake reversion. I.e. too much exhaust gases mixing with fresh intake air / fuel. There is always a wall of backed up exhaust gas for turbo engines to contend with, so 268s would be OK.

With a Supercharger, there is much less exhaust back pressure, so boost can and will go straight down the exhaust.

So the bottom line is: too much overlap is bad for both turbo and S/C, but duration is fine for both. If that makes sense.

[jims13 6]

Iike the schimel 263. Nice cam and work well on both. Exploit the exchange rate and get some.

[jims13 6]

Iike the schimel 263. Nice cam and work well on both. Exploit the exchange rate and get some.

[J4Y VR 36]

I got my eyes on a set of schrick 268

[Antihero1981 8]

264 Dr ones

[paceo 22]

old topic but where can i get schimel 263's for the vr6 abroad for cheaper than over here?

[Antihero1981 8]

doughtry racing ones are pretty cheap , 

[Dekerf1996 27]

I have just picked some schimels up from stealth for what I thought was a very reasonable £432 to my door.

Yes might be able to get some cheaper elsewhere, but saves the hassle of importing and waiting too, plus if anything goes wrong you know vince (or John in my case) will be there to sort the issues out

[Dekerf1996 27]

Also aren't you running a vsi manifold or have you sold that now?

[ssaunders 199]

i have 263's and a VGI,

good combo

[Dekerf1996 27]

When I was speaking to stealth yesterday they said they did the same thing so no real point in both, i was enquiring as I was looking at getting a VGI inlet, but they convinced me otherwise

What sort of power are you running with both??

[ssaunders 199]

RR results about 2/3rds down

http://www.vr6oc.com/forum/topic/11043-post-your-rolling-road-results-here/page-7

its before with 263's and after with 263's and VGI, i have no complaints and it gives you a slight idea of how good FI will be!

good luck 

S

[vwjetta99 0]

DSR 256 work very well.my friend runs 288 with his turbo setup