Hey guys,

There's been a discussion going on in the FI forum about using big NA cams for turbo setups. You guys will probably say that overlap is bad for turbo. But for now we'll just forget about that. Based on what I read in the thread below you would want an NA cam with high lift but low duration for boost. AFAIK the low duration and a little cam gear tuning would help keep overlap to a minimum.

If you guys had to select a high lift cam for turbo, which one would you choose? looking for a cam with good specs that has a low or no failure rate of course.

Also would you guys recommend using different intake and exhaust cams to help minimize overlap? ie using a high lift/low duration intake cam. But use something like a stock GSR exhaust cam.

In a few months I might swap out my stock GSR cams for some big NA cams. But some of the cam comparison charts Ive seen have cams measured at 1mm of lift and others measured at 0mm of lift. So I'm not exactly sure how I would compare cams measured at 0mm and at 1mm. Can any of you guys give me tips on how to do that?

TIA

https://honda-tech.com/zerothread?id=1333221

 

GSC used skunk 2 Stage 1's and had a massive gain over skunk2 turbo cams

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mohsin &raquo;</TD></TR><TR><TD CLASS="quote">GSC used skunk 2 Stage 1's and had a massive gain over skunk2 turbo cams</TD></TR></TABLE>

The link I posted above was the thread started by GSC, and it looks like that's the setup you are talking about. I'm talking about bigger cams then S2S1's though.

 

yeh, i think he was going to do the s2s2, not sure whats happened about that though

 

I believe user Black R is running Toda As in his boosted ITR. I have not heard of anything larger than S2S1s or Toda As in a turbo car. Would love to see some Toda Cs or JUN 3s

 

that would be interesting, i say we hit GSC up and ask him what happened to the s2s2's. mm boost with m22's

 

you gotta remember the gsc car isnt your standard turbo engine

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NATURAL &raquo;</TD></TR><TR><TD CLASS="quote">you gotta remember the gsc car isnt your standard turbo engine
</TD></TR></TABLE>

Some of the guys I know who are wondering the same thing about turbo and big NA cams have some serious setups.

My setup:
-mild Portflow headwork, SuperTech 0.5mm OS valves, springs, Ti retainers
-Benson sleeved 83mm GSR block, LS crank, CP pistons (9.4:1 CR), Manley rods, ARP headstuds
-SC61 turbo w/ S cover, 2.5" IC piping, Precision 600HP IC, 3" DP&exhaust
-and a lot more

My goal was originally 350-400 WHP in my CRX w/ the setup above. But I'm thinking about shooting for 500+ WHP. Currenty I have GSR cams, but if I can pick up 40-100 WHP by swapping out cams, then I'm all for that.

But anyways bump for more opinions. A lot of you guys probably have the NA cam specs memorized, hehehe. Which cam has the high lift and low duration I'm looking for. Also do you guys think it would make a difference on what the duration was?

TIA

 

i know some one with toda Cs on a boosted B16 and he is putting down 400KW at the wheels

 

rs machine cams
INTAKE:
11.938mm
272 DURATION @.050
EXHAUST:
11.43mm
270 DURATION @.050

thouse are my cam specs now for my all moter
i too would also like to know it these would be ok for boost or if i should get some smaller itr cams insteed

 

I really don't reccomend big NA cams (JUN3, M22 etc) for turbo unless your turbo set-up looks like Papadakis's.

If you are looking for extra power just don't go crazy on the bore size and get some stiffer springs so the boost don't blow them off the seats.

 

why not?...

I've heard this same opinion from different performance shops as well, but no one seems to have any hands on experience tuning a turbo engine with all motor cams. It just seems to be the "safe" opinion everyone holds on to. There's obviously more power to be made with bigger cams. The issue is being able to tune some of the overlap out. Even ITR cams have some overlap.

At what point are all motor cams good for a turbo engine? just doesn't makes sense that steph is only making big power on high boost levels and not with lower boost...

 

The gains seem to be worth it to me. I'm already upgrading all the parts in my turbo setup, so I figure why not do my cams too? Mase has a thread going where he went from GSR cams/S2 IM and went to ITR cams/JG IM and he gained 100HP (540 to 640HP) at the same amount of boost on a T3/T67. In GSC motorsports thread he went from S2 turbo cams to Jun2 intake/and S2S1 exhaust cams and gained 90HP (590 to 680HP). A 40-100 WHP gain is worth it to me.

 

I've seen first hand what happens.

Anyways, what are you guys defining a big NA cam as?

Can someone here give me a 0.050 duration number that they consider to be a big NA cam?

JUN2 is not a big cam

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rocket &raquo;</TD></TR><TR><TD CLASS="quote">I've seen first hand what happens.

Anyways, what are you guys defining a big NA cam as?

Can someone here give me a 0.050 duration number that they consider to be a big NA cam?

JUN2 is not a big cam </TD></TR></TABLE>

Well compared to my GSR cam the JUN2 is pretty big, hehehe. What kinda of stuff are you talking about when you said You've seen what happens first hand?

 

Let me ask a question.

What is the max rpm you guys want to run your turbo motor regularly?

1. 8k
2. 8.5k
3. 9k
4. 9.5k
5. 10k
6. 10.5k
7. 11k and higher (big NA cam here M24x, Skunk Stage 3 etc.)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rocket &raquo;</TD></TR><TR><TD CLASS="quote">I've seen first hand what happens.

Anyways, what are you guys defining a big NA cam as?

Can someone here give me a 0.050 duration number that they consider to be a big NA cam?

JUN2 is not a big cam </TD></TR></TABLE>

how about these? Crower 63403s:
Intake, 12.04mm lift, 267@1mm duration... and Exhaust 11.84mm lift, 257@1mm

 

the more you reduce your exhaust manifold pressure the more aggressive a cam you should be able ot use and gain some power int he process.

 

Biggest cam available without a custom grind for B series is that M25E or is it 25X) that you make isn't it Rocket?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rocket &raquo;</TD></TR><TR><TD CLASS="quote">Let me ask a question.

What is the max rpm you guys want to run your turbo motor regularly?</TD></TR></TABLE>

I was only planning on running my motor to a max of 9000 RPMs. It's an 83mm Benson sleeved B18C, with an LS crank and an actual CR of 9.4:1. I already have 0.5mm OS SuperTech valves, Supertech springs, and SuperTech Ti retainers, along with light Portflow headwork. Right now I'm not sure if I wanna go with a SpoolinPerformance EL manifold or if I want to stick with my Revhard log manifold. I'll probably go with an EL for better high end performance.

 

ITR or CTR cams will do if you want to stay under 9K.