If anyone has one of the following big cams in their stock cubed motor, I'd be interested in your experience with it, your other mods, and street manners.

1. T-Rex rev2- 242/248 .608/.612 110lsa
2. TSP Magic Stick rev2- 239/244 .625/.635 113lsa
3. MMT M2 (dont know the specs)

Thanks

 

FYI (since you don't know the specs) The MMT M2 is 228/234 .607/.598 110lsa

:cheers:

 

I've got a Comp that is similar to the M2. Mine is 228/234, .588/.601 on a 113 LSA. Idle is lumpy so far with a lot more top end, even on stock heads and w/o a tune yet. Chris.

 

I used to have the M2 and have several friends with it.

Runs like a raped ape. Aggressive lope.

 

ttt

anyone else?

I'd like to hear from anyone running a tight lobed cam in their car. <111lsa. Thanks.

 

the trex looks like a monster! anyone running it?

 

<<== 232/238 111lsa 111icl XER 346cid, any specific questions?

 

Hey, Phil!! Thanks for chiming in. Nice cam. In fact, I think we've chatted about your cam before. If I remember, this is a cam of your own design, right? I see your mods in your sig, too. I also see that your in the 10's@125 just motor?!?! Wow. Congrats. Hell of an achievement for someone that designed and built his own entire motor from the ground up in his garage. Big kudos, man. when you gonna open your own shop?
So, how was the tuning on your cam? where is your idle speed at? I'm just trying to get the feel what some of the experiences are out there with regards to driveability/tuning of a big cam in a stock motor. I have a customer that him and I really want to try out one of these monster cams. My personal Edit experience doesnt go bigger/tighter than ~230 duration on 111lsa in a stock cubed motor. He wont mind the necessary high idle speed to get the cam to be somewhat streetable. But, I dont want to wash out the cool lopey idle chop by having to set the idle speed at 1000+rpm just to keep out of oscillation/surging/stalling. I chatted with Wade for a while at ARE about big cams. He brought up a good point about putting a big cam in a stock cubed C5: because of the fly-by-wire setup, not having an actual IAC motor to tune counts for, this makes tuning a big/tight cam very difficult without having to set the idle speed real high. We like the power potential that can be had these days with the advent of the FAST intake and larger TB's. This really opened the door to bigger cam potential. I imagine more and more h/c stock cubed people will start trying bigger and bigger cams with the other parts available now for bigger flow. the customer and I want the power curve up there in the rpm range, too, so we're willing to try a big nasty cam. we plan to have the necessary valvetrain hardware so we can buzz to 6800-7k if that is where the cam want to be making power. I am very tempted to say Lets try that monster T-Rex 2 cam.
your thoughts?

Robert


[Modified by rwj383, 1:41 PM 3/4/2004]

 

Chris, what springs are you using and do you have harden spring seats?

Keith

 

Robert

232/238 111lsa 111icl XER 346cid, any specific questions?
Hey, Phil!! Thanks for chiming in. Nice cam. In fact, I think we've chatted about your cam before. If I remember, this is a cam of your own design, right?

Yeah the cam was just something I decided at the last minute. I knew the rough valve timing events and that cam was close enough.

I see you mods in your sig, too. I also see that your in the 10's@125 just motor?!?! Wow. Congrats.

The car went 10.7 and consistent 80's with basically sea-level air. There is definitely more left in tuning.

So, how was the tuning on your cam? where is your idle speed at?
~925

I'm just trying to get the feel what some of the experiences are out there with regards to driveability/tuning of a big cam in a stock motor. I have a customer that him and I really want to try out one of these monster cams. My personal Edit experience doesnt go bigger than ~230 duration on 111lsa in a stock cubed motor. He wont mind the necessary high idle speed to get the cam to be somewhat streetable. But, I dont want to wash out the cool lopey idle chop by having to set the idle speed at 1000+rpm just to keep out of oscillation/surging/stalling. I chatted with Wade for a while at ARE about big cams. He brought up a good point about putting a big cam in a C5: because of the fly-by-wire setup, not having an actual IAC motor to tune counts for, this makes tuning a big/tight cam very difficult without having to set the idle speed real high.

Tuning for a cam that big hasn't really been much different from that of my 230/230 114lsa cam. Idle is slightly rougher but still comparable to my first cam. I tweaked a few of the tables but only slightly. I would try one of the new cams in a heart beat, just make sure you got a day or so to tune.


Phillip

 

phil;

Would you have any qualms trying the TRex rev2? That is a lot of cam on 110lsa. Power from 4k-7k. Probably cut on X-ER type flanks. Hmmmm....very interesting cam

 

We have had the M2 since last year. It has a big lope but has given us great times along with the rest of our combo. Getting ready to stress it this weekend at Hallsville! :D :D :cheers:

 

Funny you ask....I would love to try a cam that big and 12.75:1 or 13.0:1. :crazy:
Phillip

 

13:1 CR? Is that possible with pump gas?

 

Hey Robert, I'm very happy with a 230/236, 112 LSA XE-R cam in my 346... It idles at 750 with no problem and the Comp 918 springs do a fine job up to 6800 rpm... I would not hesitate to go bigger, I'm a big advocate of big cams.. Since I have notched pistons I'm looking very strongly at the Grand Am cup cam... Great duration and LSA (239/251 on 110 LSA as I recall) but a little shy on lift... Since I am a road racer the short lift may provide more reliability on my 20 minute sessions... I may try it anyway... Good Luck with your selection...
Shirl
SDRE

 

Grand Am is 106 LSA. Try it ...you'll love it. :D

 

Robert - I don't have the above mentioned cams.

I have the GA cam 239/251, 106, 0.570".

LPE/SCCA CNC heads - 2.02/1.57 REVs, 42# GM/Bosch Injectors, Comp 918s. LGM original style headers. Running Open Loop.

Idles at 1200 - but out of curiosity I'll be dropping that soon.

As you know WOT tuning is easy ...IFR and PE tables pretty much does it.

Narrower LSAs and longer durations will take alot more time tuning for excellent drivability - but well worth it.

 

Hey, pops!!!
Great to hear from you!! I looked at that Grand Am cup cam, too, as an option. But I think that tight of LSA would give the rear O2s (and the fronts for that matter) a problem switching within smog specs of the OBDII, even with the cats on. Since we still need to pass that IM test here in Oregon, I should shy away from having that much scavenging taking place from 106lsa. That cam has got to scream, though.

I actually got to talk to Lou G personally earlier today. Great guy. He pointed out that since we dont want to cut reliefs any deaper than 80mils into the stock piston, we have to be careful what we choose cam-wise. The T-Rex cam sounds very interesting but we cannot figure how they're getting away with that much duration on 110lsa unless the lobe flanks are real limp (Not X-ER) ramp rates. Only with slow ramp rates would such duration and overlap allow the valves to clear the piston top at TDC + any piston rock when rolling over TDC when both intake and exhaust open during that event. Also, it would be important to cut the intake relief on a bigger diameter, like 2.125" diameter Isky cutting tool for a 2.055" valve to clear since the intake valve follows the piston down in a non-linear fashion. I have the Isky 2.125" tool, luckily.

Robert