I understand NA cams. I REALLY know N2O cams. I am understanding/learning supercharger cams, but for the most part turbo cam specs elude me. I think alot of others are in the same boat.

1. What do I look for on the intake: lift and duration
2. What do I look for on the exhaust: lift and duration
3. Lobe seperation
4. Lobe shape/ramp speed?

What am I trying to do and when/why with the various timing events.

Last of all lets put a cam together for a couple of variables.

LT1 engine

1. 355 stock heads 15psi 9:1 compression

2. 383 ported GM heads 15-20 psi 9:1

3. 383 AFR heads 15-20psi 9:1


LS1 engine

4. 347 stock heads 9:1 compression

5. 382 ported heads 9:1


BBB

 

BBB:
I thought someone would have responded by now, but for what it is worth I talked with sam at Combination Motorsports and he helped me pick out a perfect cam for my combo. It idles smooth and produces great torque. I think it is a CC 234 turbo grind.

See sig at bottem for results

Wingnut

 

they told me the 224/224 cam as well.

sts turbo as well

 

your kidding right...

 

...........yes i second that motion.

Wingnut could ya please elaborate on how those numbers are managed?

 

metanol injection? BBB call up cam motion, they selected a 218/214 cam for me, billet for only 290. they really know their stuff.

 

Sorry I did not respond earlier, but I just came in from the shop. The actual numbers look more like 792 rwhp and I suspect that there was some race fuel left in tank during dyno run. The reason, we just kept turning up the boost and no detonation. I thought I had pure 93 in the tank. After a refill, detonation started. we turnned down boost until gone. Now 702 rwhp with 57deg. F. intake air charge. Go figure. However, the car still gets over 23MPG during normal street driving. I just got so excited after the first day of runs that I had to change my signature. Now I just dont have the will to admit that there may have been c-12 in the tank. O-well, just pray for me.

In any way, I came out of the aerospace industry and put all I learned into desiging atmospheric equlizers (turbo systems in the automotive world). I build and design the systems myself and am now installing them on cars and trucks. The last system I designed was for a ram-air of mine and I built a top mount system much like the turbo Buick guys. I worked long and hard on the hedders and getting the flow numbers just right. This required the removal and re-installation of factory accessories in different locations. However, I did not install the AC. I was able to use a 3 3/4" down-pipe and exhaust system.

I have pictures of the system I will e-mail anybody if they want to see an alternative to the lower mount systems. The high mount design takes advantage of the flow characteristics of superheated air. I can provide some of my research papers if I can still find them.

By the way the STS system is, for the most part, very neet for a basic bolt on. I am jealous I did not think of it myself. O-well, good luck to the STS guys. They should make alot of money with thoes kits.

Feel free to ask any questions, I get online at night and will answer all I can. If you are in the Tulsa OK area, call me and come by.

BlownTA@valornet.com
918-688-6444
Wingnut

 

Mines almost single patterned, it has little less dur and lift on the intake side, nothing too wild, could have been a drunken grinder This is all from degreeing it, it didn't have a cam card...the joys of custom cams