so what are you doing with that old GT2-3 cam you have? lol I happen to be in the market for one.

 

Any news?

 

Depends on the results of the cam swap. If it make s more power and has decent driveability, I won't have a need for the GT2-3. But I won't let it go until I have some wheel time and track runs to ensure that I want to stay with the new cam.

 

Well, kinda...

Rick has reportedly contacted the "pulley supplier" on 5 separate occasions and has not received a positive response. The consensus is that we will put it together without the 8-rib SC pulley & idler, and will run a 6-rib belt until he can get this supplier to respond or find another source for the pulley/idler.

So, looks like I will run the new 8" crank pulley with a 2.85" SC pulley for now. Looking forward to seeing what that, combined with the new cam & Dynatech LTs does for it.

Btw, does anyone have a 3.0" 8-rib pulley for a front driven/rear inlet 122HH? lol

 

Picked up the Yukon from Rick this past week. Results of swapping the following:

1) JBA Ti-coated shorties with Magnaflow hi-flow catted y-pipe to Dynatech LTs & their hi-flow catted y-pipe,

2) LPE GT2-3 cam (207/220 573/581 118.5*) to Speed Inc. SC-1 cam (224/228 566/571 114*),

3) Oem crank pulley with 2.85 SC drive pulley to 8" crank pulley with 3.2 SC drive pulley

4) Magnason truck H/E to Magnuson CTS-V H/E.

Lost 7 rwhp, 6 rwtq, 2 lbs boost! But I did retain my 195* IATs at the end of a pull, so I didn't lose everything.

We had originally discussed and decided on a 3.0" SC drive pulley, but in the month plus it took to track down an 8-rib pulley for the 122, Rick forgot our discussion and order a 3.2". I think with the 3.0 it might have retained the boost and shown an overall improvement.

I will post the dyno & boost graphs when I get home. Transmission is still showing signs that it does not like the power/weight ratio! So, don't know if I will throw caution to the wind and hit the track until I have the cash saved up for a 4L80e.

 

i really dont get wtf is goin gon with your truck. its front driven correct??

there something going on and joe at left coast 32 has a cam specd out the lep sells get the guys 30 plus rwhp and didnt lose boost. I think cam swap gained a few gusy 25-35 at wheels but torque 40-50.

I wish you the best totally. At this point though i would do a 8 rib set up and run joes 2.7 race pulley boost prob 15 psi out of it and call it good.

 

Yup, front drive & I have just converted to an ASP 8-rib setup. It has been suggested that I mill the AFR 71cc heads down 64-65cc to reduce the combustion chamber size...thus allowing the 122hh to be more efficient at filling the cylinders. I will likely do this at some point.

Here's the graphs (old numbers are dashed lines), boost first:

 

what heads are on there??? i would think the 118 would be better than 114 for blower app.

oh well hopefully see you at the track soon

 

asp have bigger crank pulley?

 

By the IAT's, it seems that the 122 is out of its efficiency range and blowing hot air. At that temperature, you are probably only getting 12-13 degrees of timing.

The engine has became more efficient if you are running 2 less pounds of boost and making similar power. Are you running meth? How is your vacuum at idle with that cam? Are you running a 90mm TB? DRx harness?

Stick with it man and you will figure it out.