Nick996

Yeah I found that the other day too.
http://vengeanceracing.net/rpm-level...ssion-669.html

Also LG Motorsports sells a complete diff.
https://www.lgmotorsports.com/corvet...nce-diffs.html

So yeah, I guess the rear gears aren't sold as a DIY replacement but there are options for diff swaps which is nice.

MyLS1Hauls

I'm not sure how going to a lower gear will improve drivability...I've had LS setups with low gears before...Car would still buck at low RPM and low throttle. Its about engine RPM and load. If you want more RPM, shift down 1 gear. My car has a fairly large cam, and I just know that it doesn't like to run under 2000 RPM, except it will cruise in 6th above 65mph. The car already blows the tires off in 1st and 2nd. Installing 3.91 or 4.10s would just make 3rd useless as well, unless you were running some sticky drag radials, and I don't mean Nittos.

Nick996

My reasoning was that a short final drive would allow the revs to be slightly higher in each gear allowing me to run on the street in 4th gear at 45mph-50mph above the surge point. Running in 3rd is a tad too high for my liking.

All of that said I do agree with you about traction and one reason I have not seriously looked into it. I run R888 on all 4 corners and have traction issues if/when I am hammering on it through 1st and 2nd gear.

I appreciate yours and everyone else's comments. I love this forum because of that.

Unreal

Yes shorter gears help a bit, but not a huge difference. As others stated, only way to get a different gear is swap to a built up base diff. That is what RPM and all those companies are using. You lose the c6z diff and go to the base diff with gears.

NemesisC5

FWIW, too many have ruined drivability thinking they need big cam for big power. Best practice is get with induction experts like Tony Mamo, Brian Tooley, Pat G. or Martin at Tick and tell them what your setup is, what you want and "don't want" and they'll spec you a great cam for your application that can deliver power with the least amount of sacrifices. It's always best to error on the small side rather than go big and realize you've gone too far and it's not much fun as a DD.

Unreal

Way too many people buy cams off you tube videos and sound. It is sad.

Michael_D

Final gear ratio ain't gunna help one damn bit with what the op is bitchin about.

Jeezus..... I really wonder why I even try.

LS7 BUD

BTR Stage 4 cam (246/254 652/630/ 111+2) with everything else done NA wise... Car was tuned by Shortuning... The car had a little surge when it was finished but it was fine in my car as a daily driver... I then had RPM build me their top level C6 diff with 3.90's and it made the surging basically go away completely... The only time there is any surge is first gear... I can cruise at any rpm in any other gear... I was just cruising around on the highway last night at 1100-1300rpm with ZERO surge in 6th... I will say it's mostly in the tune but the 3.90's took the car outta surge rpm for the road speed limits... The 6th gear deal is cause of my tuner... He played the biggest part in the drivability but the 3.90's just made the car even more enjoyable... Now this fall we will see if 3.90's help a big cam NA C6Z in the 1/4...
A warning tho- do not use this diff with a drag radial at the track... Any bit of wheel hop will kill it... I run a stiff wall slick and that helps it live...

Silver Bullet C6

Real world advice there. Make sure to post up on how you do at the 1/4, sounds like an interesting combo to hit some good ETs.

Blackonblacksls

3.90s or 4.10 in a cammed c6z sound like a killer combo for a street car/ occasional track visits.

MyLS1Hauls

A BTR S4 with ZERO surge? Man, I'd have to see that to believe it.

So you're telling me that you can cruise around a neighborhood at 25 mph, in 4th gear, on and off the throttle, without touching the clutch, and the car doesn't buck at all? The car smoothly transitions from coasting to accelerating without any discomfort?

Blackonblacksls

When i had a tick polluter cam in my car. I don't think it ever surged once. And it's bigger or as big as a btr stg4


This video is 50mph in 6th gear at 1000rpm if I remember right...

A lot of the surging issues is maf based..

Get the maf away from the TB if you have a cam with a lot of overlap..

Upping the compression seems to help too...

http://youtu.be/uyeu7QR7mTc

LS7 BUD

I have to take people for a ride to prove it to them all the time... I'm not trying to bull**** one bit...

LS7 BUD

James at Shortuning said the same thing about the compression... I'm at 12:1cr...

BOTTLE FEDvette

I'm going to have to agree with ls7bud. James is remotely tuning my car. 6th gear on the highway going 55 drives almost like stock. The 1st gear bucking is VERY tolerable. My cam is alittle bigger then his but not by much.

Millenium Z06

My cam is a little bigger (duration wise) and I have little to no surge and can lug the car at 45-50 mph in 6th with no issues, even start in 2nd gear from a light (3rd once by mistake)
Mine is 252-258 but with LSL lobes and stock 3:42 gears. Its in the tune.
The only time I get bucking/surge is in 1st when I'm idling instead of accelerating.

RenoC6Z06

My car made 567whp sae with a coil ground issue yesterday ls7r cam prc 265cc ported heads stainless works 2in primaries and catless x pipe. Another customer went full lpe 660 with fast 102 nw 102 stainless works 2 in primaries catless x pipe and made 568whp sae. We spent 15 min and got most of the surge out of the cam and I suspect when its done it wont have much if any surge and make more power.

MyLS1Hauls

The Polluter cam is smaller than the BTR S4 cam, as well as the cam I have been running.

So again, you guys can all cruise around neighborhoods at 25 mph in 3rd or 4th, on and off the throttle without touching the clutch, and the car doesn't buck at all?

I can make a video of my car in 6th at 1600 rpm under load, showing no surging/bucking too, but it doesn't tell the whole story. I can start out in 2nd as well, if I wanted too. Taking off isn't the issue.

I've seen plenty of big cammed LS motors, tuned by many good tuners, from all over the country...NONE of them behave like stock, and none of them like running at low rpm and low throttle. I'd like to see some video of these cars with cams that have 20+ deg of overlap, driving close to stock, in a parking lot or stop and go traffic. That is the real test.

Unreal

I can putt around at 800rpm in 4th gear at 20mph with my cam. 230/246 115 LSA and it makes more than 550rwhp.

MyLS1Hauls

I'd say that's a bit under 20* overlap...besides, FI is cheating