dhdenney

iTrader: (53)

I've got a turbo cam recommendation from Cam Motion and just wanted to post up and get some opinions before I buy. My setup details I just copied from an e-mail so I wouldn't have to type it out again.

> >No emissions
> >approx 3400 lbs
> >3.08:1 gear
> >TH400 w/brake, Mary Chance will be building the stall around the cam
> >26" tire
> >stock PCM, SD tune
> >
> >single GT 47-80 turbo
> >4" downpipe
> >
> >6.0 iron block, 364 ci
> >8:1 compression
> >JE pistons, 4340 rods
> >LS6 intake
> >1.75 roller rockers
> >ported 853's, approx 210cc intake ports, 2.00" 1.55" valves, 67cc chamber
> >intake flow numbers are:
> >3.900" bore
> >
> >0.05 39.1
> >0.1 70.6
> >0.15 104
> >0.2 142
> >0.25 177
> >0.3 209
> >0.35 226
> >0.4 246
> >0.45 261
> >0.5 266
> >0.55 272
> >0.6 279
> >0.65 285
> >0.7 289
> >0.75 295
> >
> >
> >
> >Other small details: hydraulic roller of course, 96# injectors, primarily
> >street car, 93 octane most of the time, might use 110 and some increased
> >boost for strip. Looking to acheive an optimal DCR and still use the 93.
> >I
> >
> >don't want to turn this thing beyond 7000 and I am guessing low end won't
> >matter with this turbo. Looking to make max power and still be
>streetable.


RECOMMENDATION
Grind Number X2202-2123-15+5
Duration (intake/exaust) 226/220
Lift (intake/exaust) 572/560
Lobe Center Separation 115
Intake Centerline 110

1CAMWNDR

iTrader: (21)

Looks like a winner to me. Might want more lift like the Comp XE-R lobes, and I think the 5° advance might me too much, but I am used to N/A cams so it might be good.

dhdenney

iTrader: (53)

Well I am running 1.75 rockers so that lift number might be more like .590" but I'll have to check to see how they spec'ed it. I feel like maybe they should spec it again so that's why I posted up.

bowtieman81

iTrader: (35)

Looks pretty decent to me, whatever that is worth. If you want a second opinion you can have Patrick G spec out something for you. That is who I had spec my turbo cam.

dhdenney

iTrader: (53)

Thanks for that info. What are your specs if those are shareable?

engineermike

I am really not a believer in the reverse-split turbo cam. Just look at my 224/236 cam with a T76GTS on a 388 LT1. Works well and that's a pretty extreme conventional split.

Also, I think it was Speed Inc. that built a turbo 370 LSx with a medium frame 80 mm turbo. The thing made almost 1000 rwhp through a TH400 using a cam that was 236/242-112.

Mike

engineermike

Okay, found it:

https://ls1tech.com/forums/forced-induction/429231-994rwhp-863rwtq.html

370 LSx, AFR225's
T88 turbo at 22 psi boost
994 rwhp through an unlocked TH400

Cam: 236/242 - 112

Copy this.

Mike

SSilverSSurfer

iTrader: (8)

from what i understand a log style header would be better suited for a reverse split cam than a traditional header. certain kits like different splits. i dont know where i read that but maybe someone will chime in and correct me if im wrong.

engineermike

First of all, I am using a 224/236 cam with a log header.

Secondly, I keep hearing and reading that you have to altar the split depending on how much backpressure you have. However, I have never seen any dyno testing using multiple cams to prove any of these theoretical trends. Until someone posts said info, I'm not buying that a reverse split is EVER better than a single pattern or a conventional split.

Mike

SSilverSSurfer

iTrader: (8)

thats also what ive been reading about altering splits depending on backpressure, im not out to prove that a certain split is better than another just stating things ive read places,and i agree with you on someone proving on the dyno and/or track with multiple cam tests

eLTwerker

dhdenney and engineermike: what are the valve events @.050 of your turbo cams?

dhdenney

iTrader: (53)

Not sure on mine because I just got the recommendation Friday evening. I was kinda surprised to see the reverse split too as I had read before that a single pattern and even the conventional split was probably better suited to an LSx motor.

dhdenney

iTrader: (53)

I had seen this before and studied it some. I called Speed Inc first about a cam and they were kinda black and white on it. It seemed like my only two options were their 225/225 (TU1) on the website and a 234/234 with Xtreme RPM lobes. They didn't seem to give an in-between option. That cam was never brought up to me. I called W2W for about a week and couldn't get anyone to return my call or e-mail. I finally got someone and they would "do it late today or tomorrow." Well that never happened so I called Cam Motion.

Frost

iTrader: (45)

W2W would probably just turn it over to Cam Motion for a rec anyway...

engineermike

My cam:
EVO 56
EVC 0
IVO 2 Before TDC
IVC 42

Cammotion recommendation to dhdenney:
EVO 50
EVC 10 Before TDC
IVO 3 Before TDC
IVC 43

Speed Inc 370 turbo cam
EVO 57
EVC 5 After TDC
IVO 10 Before TDC
IVC 46

Cam72aro

iTrader: (28)

If it was me, I would call comp cams and see what they reccommend. I built a motor several years ago for a nitrous fed 406 s10 and they reccommended a great cam that made excellant power for the combo. Just my 2 cents, Josh

engineermike

If a part number is what you're looking for, then just call up Comp and tell them what lobes you want, what LSA, and what advance. I looked them up and you could closely match the Speed Inc cam by getting a 3728 intake lobe on a 108 CL and a 3731 lobe on a 116 CL. That's XER lobes and lift would be .566/.574 lift with 1.6 rockers. Or, you could get the 54-448-11 off the shelf, which is pretty close, at 238/240-112. Of course, either way, you might consider purchasing it from Speed Inc since they came up with the cam to begin with.

bowtieman81

iTrader: (35)

Mine is single pattern in the low 220 duration. However, my setup is no where close to yours. I think Patrick did a great job tailoring the cam to what I wanted, and he is available for follow-up questions and a little tuning advice too.

eLTwerker

That speed inc. turbo cam has 15* overlap. Isn't that a lot for a turbo cam? My N/A cam is gonna have 19*overlap.

SSilverSSurfer

iTrader: (8)

thats the one i have, its not in yet but will be in a few weeks, i'll let you know how it does