AZ Power & Sound

iTrader: (2)

As it says... went from the G5X2 and REV valvetrain to the G5X3 with Comp 921 valvetrain... changed nothing else at the time...

**** Pros over the G5X2 ****
- Pulls FOREVER... thing never stops pulling! im gonna raise my rev limiter to 7000 from 6800 just because the car seriously doesnt let off and I feel like im wasting power by shifting!

- 100 times more drivable...

- Better idle

- Better fuel economy by at least 2 mpg

- hits gears so incredibly hard the car shudders now when I slam gears

- MUCH quieter compared to the X2... still has authority but I can use my cell phone now and talk to passangers, not to mention I dont rattle pictures off the wall at houses I go to anymore!

**** Cons to switching from the G5X2 ****

- Lost my low end... the G5X2 had INCREDIBLE low end and snap... soon as you touched the gas the power was there waiting to kick you in the ***

- for some reason just felt faster than the G5X3... they are two completly different cams!

- Lost my agressiveness and the fun part of having every car in the intersection stare at you, as well as people running up to your car askign you to pop the hood or throw a rev when they hear the car!


All in all im happy with the swap because I get better mileage, the car is much better to drive on the street now, and the top end power is AMAZING! As long as you smack the gas above 3000 theres massive amounts of power waiting and it NEVER stops pulling until redline! I just cant wait to get some heads and the LSX to see if theres some untapped power waiting up there! I guess you could say the powerband is more "European" now with the little lack down real low (idle to 2000 rpm), then the gradual increase at 2000-3000, then the HARD hit at 3000-6800

Edit - Anyone looking for a cam with massive power that wont sacrifice reliability and drivability go with the G5X3... its HONESTLY at least 10 times more drivable than the G5X2 was, and it makes more power! I Think someone finally found the secret to HUGE cams with daily drivability! Just for reference I commute 30 miles to work and 35 miles home from work (different routes because of rush hour) and I sit in traffic... This cam is awesome for the entire drive and it is very quiet even with no cats and XR1s/true duals!

Damian

iTrader: (89)

You're mostly noticing the change in TQ and "SOTP" because you went with a 114 LSA, which generally will bring your power band higher, and lose some low-mid TQ....Your idle quality is also better because of the 114....Congrats on your swap, should be a screamer...


Josh

foff667

iTrader: (2)

kewl now throw it on a dyno and then to the track

Bink

What are the specs on the two??

Widening the LSA should not drop your bottom end power - all else being equal.

SPANKY LS1

iTrader: (24)

The G5X2 is 232/240, the G5X3 is bigger

Won't widening the LSA, instead of causing a true "drop" in bottom end power, move the whole powerband up, creating a couple hundred more RPM before the cam "comes in" so to speak, giving the SOTP feel and illusion of less low-end power?

Shawn

deviate42

iTrader: (2)

sounds badass

thanks for the feedback

Bink

I would think the drop in SOTP feel is due to a later intake closing.

If they increased duration and widened the LSA wouldn't the Intake closing point be later in the compression stroke??

So the dynamic compression ratio would drop as well as cylinder pressures, of course. This would have a greater effect at lower RPM (i.e. torque).
Wider LSA means less Overlap and more efficient cylinder filling at lower RPMs.....greater VE at lower RPMs.
If I have this wrong ...please correct me. FWIW.
joel

maddboost

iTrader: (11)

Was the car tuned on the X2? Was it tuned again on the X3? What kind of headers are you running?

AZ Power & Sound

iTrader: (2)

mail order tuned then dialed with a MAFT on the G5X2... X3 I slapped in and reset the ECU and thats it. I dont really have much time to get it tuned, plus with the crap gas we have and hot summer temps I really cant get it dialed for power or it detonates like crazy in the summer!

Running SLP LTs with no cats, custom Xpipe and Borla XR-1 2.5 inch race mufflers

I have a couple more toys coming in the mail before I hit the dyno... but soon! I havent had a chance to really hit the 175 shot on it either... but it was nasty on the X2 so I imagine the X3 is even better!

LG Motorsports

Glad to see you are happy with the switch. We too are happy with the results.

Thanks
Lou G

jaberwaki

post a graph when you can

1RED6SPD

I cant wait to get mine now, it should be here today. i got the 112lsa. anyone have a sound clip?

jtz28

So would a Lower LSA (Say 109 vs 114) with the same Cam specs peak more TORQUE at lower rpms? In other words, same power, but shifting everything Down.


Joe

CHRISPY

I'd really like to know the intake duration on this cam

Does it require flycutting with stock heads?

How about just the Intake valve closing point?

verbs

The LSA difference should only move his powerband up 200rpms, but don't forget the increased duration which could have moved the powerband up even further. FWIW my TR230 cam peaks higher than a buddy's TR 224 cam- his LSA is 112, and mine is 110.8, but my added duration shifted the peak up higher than the TR224 even though my cam has a lower LSA.

verbs

The 114LSA does not require flycutting on the G5X-3 cam with stock heads, which is one of the reasons SS on Your Six chose this cam. Had he gone with a 112LSA, he'd have to flycut. Once he goes with aftermarket heads/bigger valves (his are stock LS6 heads), again, he'll have to flycut regardless of what LSA his cam is (114 vs. 112).

CHRISPY

ahh ok that gives me a good idea

Dope

iTrader: (2)

Just drop your idle down to 500rpm for that killer idle again

Dope

Biochem

I'd be slightly concerned about any cam that has the tight tolerances (have to cut pistons at 112 but not at 114) and the quality of my springs and having to rev to 7k... how good are those 921s for that?

WS6snake-eater

You do not have to flycut with the G5X3 on 112, with stock deck height heads. I have it in my car, and it is within tolerance. I've got PP Stage II LS6 heads, which are stock deck height, and am using the GM gaskets. It will fit fine. FWIW, I would still check valve drop before taking my word for it, because it is close and every setup is different. I'm just speaking from my experience, I did not flycut.