Monkfish Diff cover....
Monkfish Diff cover....
Author
Discussion

behold81

Original Poster:

2,931 posts

200 months

Tuesday 30th March 2010
quotequote all
Anyone fitted one before??? does it make much of a difference? Tramping is quite bad on the GTS when the rear decides to brake loose. (All by its self with no hel from me... Honest...)

Ta

Bonnie and Clyde

11,701 posts

223 months

Tuesday 30th March 2010
quotequote all
I think loads have fitted them, if your talking about the Harrop diff cover. I believe they are a very good upgrade.

gsd2000

11,515 posts

214 months

Tuesday 30th March 2010
quotequote all
I was told that unless i was running big power, tracking the car or drifting then it wasnt really needed. If your car is tramping maybe look into upgrading the rear bushes first.

behold81

Original Poster:

2,931 posts

200 months

Tuesday 30th March 2010
quotequote all
gsd2000 said:
I was told that unless i was running big power, tracking the car or drifting then it wasnt really needed. If your car is tramping maybe look into upgrading the rear bushes first.


Its the Drifting bit!! when (On private roads) it gets sideways it sometimes tramps. Im assuming the diff cover resolves this?

gsd2000

11,515 posts

214 months

Tuesday 30th March 2010
quotequote all
For the drifting part i thought it only helped as the harrop cover holds more oil so the diff oil stays cooler prolonging the life of the diff. I think it is suppose to help a bit but by how much i dont know. I know reading reviews on the american forums some say that it cured their tramping others say it didnt do anything. But they all agree that it looks good.

007 VXR

64,187 posts

218 months

Tuesday 30th March 2010
quotequote all
i have it fitted to mine but had loadsssssss of other bits all done at the same time so could not say for sure that this one part on its own will stop your problem.

but at the price could be worth ago smile IMHO

behold81

Original Poster:

2,931 posts

200 months

Tuesday 30th March 2010
quotequote all
AFAIA Tramping is normally caused by movement of the drivetrain. The cover seems to strengthen the diff mount and should minimise movement.

Thats my take on it!!

007 VXR

64,187 posts

218 months

Tuesday 30th March 2010
quotequote all
behold81 said:
AFAIA Tramping is normally caused by movement of the drivetrain. The cover seems to strengthen the diff mount and should minimise movement.

Thats my take on it!!
give the fish a phone and talk it over with roger smile

S800VXR

5,877 posts

231 months

Wednesday 31st March 2010
quotequote all
Harrop cover alone will not help alot, it does contribute towards stopping tramping but it wont really be very noticable unless other things are upgraded as well. Primary reason I fitted it was for the extra oil volume it holds to help keep the diff alive for prolonged hign speed playing in Germany.

ringram

14,702 posts

279 months

Wednesday 31st March 2010
quotequote all
Have a read up on asymetric axles. Thats what GM now use in the CTS-V and the latest Z06 Corvettes to deal with this exact issue.
Gforce1320 sell the kits for the monaro and vxr8.

monkfish1

12,515 posts

255 months

Wednesday 31st March 2010
quotequote all
A total axle tramp solution would look a bit like this:

G force level 1 anti hop driveshafts,
Rear end Pack with either a Harrop diff cover or an upgraded diff mount (part of rear enf pack)
Decent rear dampers

This will significantly improve it. You can fit addtional shims to the rear subframe bushes, but it does start to increase the noise and harshness.

behold81

Original Poster:

2,931 posts

200 months

Wednesday 31st March 2010
quotequote all
Ta all. Just spoke to roger at the fish and he has helped me cost up a nice shopping list for me to cry over until SWMBO allows me to put in for a few quid.

Ill start with some bushes and go from there. from what i hear mine are likely to be shot.

MyM8V8

9,468 posts

226 months

Wednesday 31st March 2010
quotequote all
behold81 said:
Anyone fitted one before??? does it make much of a difference? Tramping is quite bad on the GTS when the rear decides to brake loose. (All by its self with no hel from me... Honest...)

Ta
On it's own not a chance. Whatever you do (and I have done about the lot without gutting the back end for a 4 link) the problem is inherant in the IRS setup which is a geometrical nightmare.

You also need to consider (if you want to be hyper critical), prop' mounts, doughnuts, gear box mount, engine flex. They all compound the problem of oscillation when the wheels start bouncing. Of course everything you alter to reduce the problem also causes less compliance in those areas, "a cock up to cure a cock up" if you like.

You don't need the Harrop housing unless you want it's other advantage (oil capacity) and the bling effect, there is a nice relatively cheaper urethane bush to replace the wobbly rubber piece.

The Fish normally have all of the common parts needed to start the process.

behold81

Original Poster:

2,931 posts

200 months

Wednesday 31st March 2010
quotequote all
MyM8V8 said:
behold81 said:
Anyone fitted one before??? does it make much of a difference? Tramping is quite bad on the GTS when the rear decides to brake loose. (All by its self with no hel from me... Honest...)

Ta


On it's own not a chance. Whatever you do (and I have done about the lot without gutting the back end for a 4 link) the problem is inherant in the IRS setup which is a geometrical nightmare.

You also need to consider (if you want to be hyper critical), prop' mounts, doughnuts, gear box mount, engine flex. They all compound the problem of oscillation when the wheels start bouncing. Of course everything you alter to reduce the problem also causes less compliance in those areas, "a cock up to cure a cock up" if you like.

You don't need the Harrop housing unless you want it's other advantage (oil capacity) and the bling effect, there is a nice relatively cheaper urethane bush to replace the wobbly rubber piece.

The Fish normally have all of the common parts needed to start the process.


Yeah I spoke to them about there kits. Im gonna get the full 3 bush kit. Diff and trailing arm. Mine are spliting in two so there shot. Might be half the issue.

Start there and work on up.