Is this behavior normal after cam install?
Thread Starter
Pro
Joined: Oct 2016
Posts: 523
Likes: 90
From: Los Angeles, CA
Is this behavior normal after cam install?
Recently had the LG G5XE cam installed and ported and milled the stock LS6 heads on my 2004 C5 Z06. A couple things I've noticed:
1. Sometimes when starting up the car it gets on the verge of not starting. Almost like stuttering before it fully turns over. (Imagine trying to turn on a car with no gas in it, kind of like that)
2. 2nd gear, any time under 1500-2000rpm, I get a ton of surging/bucking. I've noticed in third gear at that rpm it's not as bad. I have noticed that even before the cam I would get that surging/bucking in 2nd gear. Is there something maybe wrong with my transmission? I remember in my 2004 GTO I could idle around a parking lot in 2nd gear no problem at all. It's quite annoying on the freeway in bumper to bumper traffic when I just want to keep it in 2nd gear the entire time.
I thought these were more traits of a big cam, are these normal for a smaller cam like the G5XE?
1. Sometimes when starting up the car it gets on the verge of not starting. Almost like stuttering before it fully turns over. (Imagine trying to turn on a car with no gas in it, kind of like that)
2. 2nd gear, any time under 1500-2000rpm, I get a ton of surging/bucking. I've noticed in third gear at that rpm it's not as bad. I have noticed that even before the cam I would get that surging/bucking in 2nd gear. Is there something maybe wrong with my transmission? I remember in my 2004 GTO I could idle around a parking lot in 2nd gear no problem at all. It's quite annoying on the freeway in bumper to bumper traffic when I just want to keep it in 2nd gear the entire time.
I thought these were more traits of a big cam, are these normal for a smaller cam like the G5XE?
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
That's why I am not a fan of dyno tunes on a car driven on the street--All they do is run it up to WOT in 3rd gear and check the AFR and timing only there to produce max HP and TQ
A street driven tune addresses all your starting and P/T drive ability
All the symptoms you describe are easily corrected by a tuner that will take the time to address your issues with a street tune----
A street driven tune addresses all your starting and P/T drive ability
All the symptoms you describe are easily corrected by a tuner that will take the time to address your issues with a street tune----
Intermediate
Joined: Jul 2016
Posts: 47
Likes: 1
It is all in the tune. I just had my car road tuned, two weekends ago, for that same reason. Idle would not hold when the clutch was pressed in. Always died. And I had surging under 2k Rpms at every gear. Now idle is great, perimeters where modified to cruise at every gear 1500-2000rpms , even cruising at 40mph in 6th gear 
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Advanced
Joined: Jul 2015
Posts: 94
Likes: 10
From: Birmingham AL
I just got a cam installed and it has a high idle. It only has a cam and is only a street car. I can let off the brake and get to 20 mph. Shifts out of 1st on its own. Going back to get it tweaked down.
Racer
Joined: Jan 2012
Posts: 398
Likes: 22
From: Las Vegas NV
Hate to pile on but your tune sounds like its a mess. That should be an easy cam to dial in(even w/o street tuning), excluding any mechanical issues.
Last edited by Cheesecake 07; Apr 11, 2017 at 03:17 AM.
Racer
Joined: Jun 2016
Posts: 380
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From: Kelso Wa.