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Old 07-23-2022, 09:21 AM   #1
red740t
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Default Who has run a VX3 cam on a turbo engine?

I'm constantly ready how the VX3 sucks for turbo engines but I just can't see why. the only negative is the smaller exhaust lift but that could be offset with larger exhaust valves and port work. The cam doesn't have a lot of overlap and valve sequence seems good.
I'm only asking because I'm building a 745t for the Grassroots Motorsports $2000 challenge and I got the cam cheap.
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Old 07-23-2022, 09:24 AM   #2
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everything I've run the vx3 on has been slower than it was previously. even with a T cam. Why would you try to do port work and valve work to offset lower lift, when a better cam will yield better results without the port work (And even better with the port work). for the grm 2k challenge, unless you can score a cheap ipd turbo cam or enem v15, I'd just leave the turbo cam in there and focus on everything else.
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Old 07-23-2022, 11:42 AM   #3
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everything I've run the vx3 on has been slower than it was previously. even with a T cam. Why would you try to do port work and valve work to offset lower lift, when a better cam will yield better results without the port work (And even better with the port work). for the grm 2k challenge, unless you can score a cheap ipd turbo cam or enem v15, I'd just leave the turbo cam in there and focus on everything else.
Really? The T cam is so friggin aweful. I just don't see what makes the VX3 so bad. I do have a B cam I could try.
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Old 07-23-2022, 01:36 PM   #4
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Originally Posted by red740t View Post
I just don't see what makes the VX3 so bad.
Because you don’t own a chassis dyno. Kenny does.
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Old 07-23-2022, 02:07 PM   #5
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Because you don’t own a chassis dyno. Kenny does.
and the prize for stupidest comment goes to.

What does owning a chassis dyno have to do with why or why not a cam works well?
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Old 07-23-2022, 02:22 PM   #6
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Originally Posted by red740t View Post
and the prize for stupidest comment goes to.

What does owning a chassis dyno have to do with why or why not a cam works well?
Because he can actually test instead of bench racing? NA cam = better for NA?
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Old 07-23-2022, 03:44 PM   #7
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I’d listen to the voice of experience. Linuxman knows more than most on here. I’d just try them all and see what you like. Or trade them all for an ipd turbo cam and call it a day. But that’s only talking from my own experience and what I like. What size turbo? What supporting mods you plan on running might help guys steer you in the right direction.
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Old 07-23-2022, 06:04 PM   #8
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Quote:
Originally Posted by red740t View Post
and the prize for stupidest comment goes to.

What does owning a chassis dyno have to do with why or why not a cam works well?
bold move calling out mike like that. probably not the best way to get good information either.

the bottom line here is this:
You're going to sit here and tell us it's cheaper to source oversized valves, do head work, spend money on a headgasket kit, etc... so you can crib up a lackluster cam?

Mike didn't mention I have a flow bench as well, and without channeling the power of the swedes I can't really say there are drastic gains to be had with bigger valves and exhaust porting. Further, the bulk of the airflow you're going to get from an 8v is in the mid-lift regions, going higher on the lift does help some, but it's not some kind of panacea of performance. You will find on the cams that work well, longer duration is more favorable than additional lift, overlap somewhat be damned... and this has held true for quite some time. Of course there are limitations to this rule, and eventually cubic dollar bills come in to play to go further.

The cars that have always performed well on the dyno(s) that I've tuned have pretty much all had either the ipd turbo or the enem v15. Just about everything else has underperformed for one reason or another. The oe b230 intake manifold leaves a lot to be desired, the exhaust manifold likely starts to get tight at higher rpms (but that's relative as well), to run the bigger cams you need pretty extensive head work, springs, different buckets, the list goes on.


so for a 2k build... skip the cam, get a 16t or a t3-60 trim, exhaust, engine management, and bigger bigger fuel injectors. if you still have some space left over in the performance budget, consider a better (not ebay-those are hot garbage as well, even on 170hp low boost setups) intercooler. the rest of your money and time should be spent doing things like brakes, suspension, the sorts of things that will help on the auto-x part of the competition, because you're not going to make waves with a nearly stock 8v for the drag race part of the event.
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Old 07-23-2022, 06:11 PM   #9
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and anyway, regarding the dyno thing... willing to bet there's no other single person on the forum that's tuned more turbobricker cars (I know, odd flex, it just kinda shook out that way with the various SE meets and what not) in person and remote, so the sample data reaches pretty far and wide. Personally I don't much care for the 8v stuff, but a 16v conversion is definitely not in your budget.
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Old 07-23-2022, 09:02 PM   #10
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Kenny, thanks for explaining all that. My brother and girlfriend are here, so i’m not online much.
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Old 07-23-2022, 10:28 PM   #11
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Quote:
Originally Posted by red740t View Post
and the prize for stupidest comment goes to.
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Old 07-24-2022, 09:00 AM   #12
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Originally Posted by linuxman51 View Post
bold move calling out mike like that. probably not the best way to get good information either.

the bottom line here is this:
You're going to sit here and tell us it's cheaper to source oversized valves, do head work, spend money on a headgasket kit, etc... so you can crib up a lackluster cam?

Mike didn't mention I have a flow bench as well, and without channeling the power of the swedes I can't really say there are drastic gains to be had with bigger valves and exhaust porting. Further, the bulk of the airflow you're going to get from an 8v is in the mid-lift regions, going higher on the lift does help some, but it's not some kind of panacea of performance. You will find on the cams that work well, longer duration is more favorable than additional lift, overlap somewhat be damned... and this has held true for quite some time. Of course there are limitations to this rule, and eventually cubic dollar bills come in to play to go further.

The cars that have always performed well on the dyno(s) that I've tuned have pretty much all had either the ipd turbo or the enem v15. Just about everything else has underperformed for one reason or another. The oe b230 intake manifold leaves a lot to be desired, the exhaust manifold likely starts to get tight at higher rpms (but that's relative as well), to run the bigger cams you need pretty extensive head work, springs, different buckets, the list goes on.


so for a 2k build... skip the cam, get a 16t or a t3-60 trim, exhaust, engine management, and bigger bigger fuel injectors. if you still have some space left over in the performance budget, consider a better (not ebay-those are hot garbage as well, even on 170hp low boost setups) intercooler. the rest of your money and time should be spent doing things like brakes, suspension, the sorts of things that will help on the auto-x part of the competition, because you're not going to make waves with a nearly stock 8v for the drag race part of the event.
Thanks for the explanation. I have built a handful of red locks and have read more than I should have. I am using a 531 head and have cleaned the ports up. I’ll play with the cams and see what I can make work. I have a few cams but no Turbo cams.
As far as coming at mike, he basically insinuated that I was arguing with you. I simply asked who has experience with the VX cam and then mentioned how terrible the T cam and that maybe I would try the B cam.
His comment was just plain stupid. I have full access to a brand new Dynocom dyno so making assumptions is just foolish.
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Old 07-24-2022, 09:42 AM   #13
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I assumed correctly. If you owned a dyno you would have bragged about it already.
And mine was a light-hearted comment, i don’t often feel the need to check/correct/“pwn” someone.
Project silly attitude, win silly prizes.
Good luck with your vx3.
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Old 07-24-2022, 03:56 PM   #14
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Many years ago I met one of our old time members at the Rockleigh show in Northern NJ. He put a VX3 cam in a B23FT and when I asked how he liked it. He told me he didn't like it. It made the engine very on/off like no power off boost then in boost it turns on aggressively. I would use a B cam or buy IPD turbo or enem V15T cam. The enem cam would be my choice for a good street performance cam with good torque. I did it twice both turbo and n/a. Was worth every penny.
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Old 07-24-2022, 05:45 PM   #15
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Originally Posted by red740t View Post
Thanks for the explanation. I have built a handful of red locks and have read more than I should have. I am using a 531 head and have cleaned the ports up. I’ll play with the cams and see what I can make work. I have a few cams but no Turbo cams.
As far as coming at mike, he basically insinuated that I was arguing with you. I simply asked who has experience with the VX cam and then mentioned how terrible the T cam and that maybe I would try the B cam.
His comment was just plain stupid. I have full access to a brand new Dynocom dyno so making assumptions is just foolish.
If you've built so many redblocks, why are you even asking the question?
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Old 07-24-2022, 06:09 PM   #16
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531 has the same terrible exhaust port, so the same discussion applies there as well. the enem v15t and ipd turbo cam are virtually identical (word on the street is it's a direct copy)
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Old 07-24-2022, 06:42 PM   #17
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The two my dad and I degreed were damn close, although not identical.

IPD cam 225/227 @.050", .447" lift after lash, 110* LSA
V15T cam 229/227 @.050", .457" lift after lash, 112* LSA

The VX has reliably disappointed my butt dyno although I've never tested one on a chassis dyno. T cam+13C torque hit is pretty respectable for minimal effort, could be handy on some autox courses.
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Old 07-24-2022, 11:19 PM   #18
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I liked my rsi stg3 cam WAY more than my ipaydouble csm thats currently in

Last edited by linuxman51; 07-25-2022 at 08:02 AM..
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Old 07-25-2022, 04:19 AM   #19
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My quickest ET was A cam and 15g stock head. 12.61. RSI stage 3 12.7's. Greg Ervin ran 12.60 with 15g and IPD turbo cam. 740's gutted and with slicks.
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Old 07-25-2022, 08:02 AM   #20
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interesting. we back-to-backed it against the ipd turbo cam and the ipd turbo cam made the same (or maybe more?) but with more under the curve

my take on the rsi stage 3 is that it wants more head flow all around (port work, better intake manifold, better exhaust manifold, bigger turbine and housing) and I imagine would then want to spin on up. in the relatively stock-ish world it doesn't really measure up.
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Old 07-25-2022, 08:52 AM   #21
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If I remember correctly, the vx is a V cam with its nuts cut off on the exhaust side. Since the exhaust ports and shrouding are so bad on the 8 valve Volvos, you would want, if anything, MORE lift and definitely more duration to get more air past that horrifying short turn radius.

A quick read on split-pattern cams:
https://www.onallcylinders.com/2014/...-pattern-cams/
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Old 07-25-2022, 09:03 AM   #22
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Also, the reason for less intake duration is to close that valve a little earlier and get some low-speed squeeze started earlier. Towing grinds are split a lot of the time.

Possible reason for Simon’s better ET on the milder cam: better launch, or maybe outside changes like humidity.
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Old 07-25-2022, 09:38 AM   #23
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If you've built so many redblocks, why are you even asking the question?
Because I got a cheap VX3 and I've never used one. how is that hard to understand?
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Old 07-25-2022, 10:20 AM   #24
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I’d listen to the voice of experience. Linuxman knows more than most on here. I’d just try them all and see what you like. Or trade them all for an ipd turbo cam and call it a day. But that’s only talking from my own experience and what I like. What size turbo? What supporting mods you plan on running might help guys steer you in the right direction.
I've been in this group since 2008. i know damn well who Kenny is which is one of the reasons I came here to ask my question.
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Old 07-25-2022, 10:24 AM   #25
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I assumed correctly. If you owned a dyno you would have bragged about it already.
And mine was a light-hearted comment, i don’t often feel the need to check/correct/“pwn” someone.
Project silly attitude, win silly prizes.
Good luck with your vx3.
You sound like an idiot again. Why would I come in here and brag about my access to a dyno? I never said I own one. My shop neighbor does and I have full access to it whenever I want. The fact of the matter is that I came in here to ask why people don't like the cam and except for a few guys I get a bunch of idiotic keyboard warrior replies.
What in the hell happened to this group. we used to be a bunch of Volvo enthusiasts who helped eachother because we realize our cars are somewhat obscure and we are a fairly small community. Now it seems to be infected with smartass keyboard warriors.
Times like this make me really miss guys like Tricmick
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