G5X3 owners
Thread Starter
Burning Brakes
Joined: Apr 2003
Posts: 788
Likes: 15
From: Martinsville, Indiana
G5X3 owners
I am seriously thinking about getting the G5X3 cam and was wondering for the owners of this cam--if you had the heads milled and used the stock short block, did you feel like you lost low end torque or did it feel somewhat stock on the lower end? Thanks.
Mark
Mark
Racer
Joined: Oct 2006
Posts: 410
Likes: 0
From: Houston Tx.
I don't have the g5x3, but I do have a 238/242 .609/.615 on a 111lsa and it is a lot harder to start in first, now. I think I need to go with 3.90's or 4.10's to make up for the bigger cam. It does feel like I lost some low end grunt, but I think a new gear will make up for that. To me it feels like there is no middle ground when taking off, either you have to really feather out the clutch or bog down on the takeoff; doesn't seem like there is anything in between. I am also on the stock heads, one shop said that a p&p on the heads might solve some of those problems.
Instructor
Joined: Dec 2004
Posts: 184
Likes: 0
From: Middletown DE
I have the G5X3 cam @114 lsa, stock heads, LT headers, Borla Stingers, Manual trans., 3.42 gears. I agree that the car lost some low end grunt, when taking off you have to feather the clutch quite a bit to get a smooth launch. I am going to switch to 4.10 gears to try and balance out the lack of low end torque. I would like to do the heads for overall HP increase, but not sure if it would help with lower rpm performance.
Melting Slicks
Joined: Jul 2004
Posts: 2,826
Likes: 39
From: Central NJ
St. Jude Donor '05-'06-'08-'10
I have the G5X3 with no headwork. Car does lose some low end grunt, and smooth stoplight launches require practice with the clutch. However, from about 3000 rpm's and up the car rips. 
Instructor
Joined: Jan 2006
Posts: 214
Likes: 5
From: Middletown Delaware
I have the X3 on 114. With a good tune I have no problem with first gear. Run rpms to 1500 and feather out. I agree the car is super power full from 3000 up. I am making 402RWHP with header, cam and under drive. Heads and intake stock.
You will need to get 921 springs to go with the large lift. I would check with LG on how much you can shave off because of PTV clearance. The extra compression should make up the low end power.
You will need to get 921 springs to go with the large lift. I would check with LG on how much you can shave off because of PTV clearance. The extra compression should make up the low end power.
Racer
Joined: Feb 2007
Posts: 328
Likes: 0
From: Orange County California
I have the G5X3 on a 112 and it has tons of grunt. Compared to my friend's stock 04Z it feels stronger all throught the powerband. Sometimes it just feels like it lost torque because of the massive power gain up top when in reality it actually gained a few lbs./ft.
Justin
Justin
Pro
Joined: Feb 2007
Posts: 702
Likes: 1
From: Frankfort Il
Last G5X3 (or very similar custom grind) C5 we did, also had a set of Patriot LS6 heads on it. Car was a M6 with stock gearing. Under 3800rpm, the HP curve was almost identical, picking up only 5rwhp, but then at 3900rpm it looks starts making a huge difference in HP. If I can get the dyno graph scanned, I can try to post it. Under 3800rpm that cam makes about the same as a stock cam, but by 4000rpm it's a rocket.
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