GTD Wheel hop/tramping testing

[Jackie Treehorn]

Jesus,

I hope you get something other than Bridgestone on your new car and give us all some peace...

So do I, can't you tell? 

If not, i'll give you first refusal on them when I swap them out for something with more grip. 

lol,

I like your thinking 

But will be switching to Michelin compound when i need to, as I always prefer Michelin for a replacement to improve the original factory fitted tyre

[matchboy]

Jesus,

I hope you get something other than Bridgestone on your new car and give us all some peace...

So do I, can't you tell? 

If not, i'll give you first refusal on them when I swap them out for something with more grip. 

Even if you get Bridgestones on your R MH, its far less of an issue.  I haven't had any tramping at all, in fact, the only time the ESP light has flashed I didn't feel a thing as (I assume) the power was shifted to another wheel - only reason I knew it was on was because the warning light was flashing.

That's not to say they're as grippy as other tyres - that's another issue, particularly in the wet - but as far as tramping goes, either from a standing start (normal or launch control) or nailing it at low speeds, I've not encountered any tramping.

I will still be swapping them asap as soon as I've gone through them however!

[monkeyhanger]

Jesus,

I hope you get something other than Bridgestone on your new car and give us all some peace...

So do I, can't you tell? 

If not, i'll give you first refusal on them when I swap them out for something with more grip. 

Even if you get Bridgestones on your R MH, its far less of an issue.  I haven't had any tramping at all, in fact, the only time the ESP light has flashed I didn't feel a thing as (I assume) the power was shifted to another wheel - only reason I knew it was on was because the warning light was flashing.

That's not to say they're as grippy as other tyres - that's another issue, particularly in the wet - but as far as tramping goes, either from a standing start (normal or launch control) or nailing it at low speeds, I've not encountered any tramping.

I will still be swapping them asap as soon as I've gone through them however!

I'm pretty sure i'll be getting mine swapped out, poor wet grip is not something I want, even if the 4WD sorts the traction out. £90 each or £320 for the set anyone?

[ffrank]

I'm pretty sure i'll be getting mine swapped out, poor wet grip is not something I want, even if the 4WD sorts the traction out. £90 each or £320 for the set anyone?

I think you should put them on eBay and post your reviews from here and see if they sell In all seriousness I'm sure they would go on Gumtree if there's no takers.

[ffrank]

Update on my car, as mentioned above I could only recreate tramping in 1st gear (if at all), and never in 2nd gear.

I now have new tyres on the front, vredesteins, and increased bhp thanks to a dtuk box. On some testing today I was getting tramping in 1st gear if flooring it, but I could not replicate any tramping in second gear. This was on damp roads also.

I am thinking there must be another factor at play here. If Fred, you can replicate tramping reliably in 2nd gear, and I can't even with 240bhp going through the front tyres, something doesn't add up!

The DTUK box might well (in fact almost certainly) have a different power curve though surely?

Maybe that's the answer, if I just add a huge pile of extra power, it all goes away.... I'm off to convince my fleet manager that its a safety measure

I believe the curve is very similar up to 1800 (the box adds about 10bhp from 0-1800 from what I can see) and then the big increase feeds in from 1800. This is in map 3+1 at least (which I tested with).

So mine and Graham's results seem strange, but yes, the logical conclusion is... more power! (To quote Clarkson).

Your fleet manager can't argue with this logic, surely!

[monkeyhanger]

ffrank: The DTUK box added very little to mine pre-turbo (as you might expect, the engine is probably only kicking out 95ps and 200Nm without the turbo), you can feel the difference a little between 1700-2100rpm, but it felt far more noticeable above 2100rpm.

[ffrank]

Yes, agreed - it's a small addition pre-turbo but still feels very noticeable (smoother is the word I would use). I guess it is from some increased fueling?

I can't find the more recent dyno's anymore (with Trevor comparison), but here is one of the earlier ones that I checked earlier when I estimated the extra 10bhp pre turbo.


On this dyno (pre full development of 3+1 of course!) the real boost happens around 1900, and Max torque at 2150 which seems inline with your observations.

As an aside, all of your comments and reviews (and no doubt feedback for tweaks to Andrew) of the DTUK really were spot on! Not that I ever doubted it, but it's transformed the car - and not just in a boy racer way (as fun as that is) but in smoothness and driveability. But I best shut up about it, sorry Fred!