Lack Of Power with 30" Tyres

[HotAe92]

Hey all,
im having a bit of a problem with my '98 Coily.
Now i know these cars havent got ballbreaking power in stock form, but i find that my car struggles with the 30" Pro Comp muddies i have fitted. Most hard terrain it is fine, but in the boggy sand, most of the time i have to drop it back to 1st L because it just doesnt have enough power to hold it in 2nd.

for example, i was down on Wilbinga beach on Monday, and the car went mostly fine up most small dunes, but when it came to larger dunes, i had to get a massive run-up, but would usually ONLY JUST make it to the top. Yes, the tyre pressures were down to 20psi. When i tried to hack along the beach, i had to rev the shit out of it in 1L and quickly drop it into 2nd, which would then only putt along at about 2,000rpm, even at flat stick.

Im looking at my 4wd experience as part of the problem, but i still think that power is a part contributor. Im looking at fitting extractors and 2" system once i finish paying off bits and pieces.

Have any of you experienced a similar problem
Cheers
Jayden

[ausyota]

Yes, the tyre pressures were down to 20psi.

Drop the tyres down to 10psi (or even 8psi).
The zook is only a light vehicle you wont have any bead problems at low pressures.
Having 20 psi you may as well have 50 in there with the light weight of the zook and the fairly stiff sidewalls of the muddies you wont have a very big footprint.
Drop the pressures to 10 and see how you go. You wont believe the difference.

This is one of the things I hate about 4wd mags. They are always telling people not to drop their pressures to below 16-20 psi. That is maybe true for a fully loaded tourer weighing a few ton but for a zook or even a ute 10 psi is a much better idea.
Paul.

[bazooked]

ya beat me to it

[HotAe92]

cheers guys for the quick response. yeh ill give that a try next time, and ill let you know how i go.

[alien]

i used to run my 215/75's at 5-7psi on sand and it went GREAT! on road i ran them at 20psi in winter and 27psi in summer (needed more grip in winter)

another problem may also be the muddies digging into the sand - theyre called muddies cos theyre meant for mud =)

[HotAe92]

i used to run my 215/75's at 5-7psi on sand and it went GREAT! on road i ran them at 20psi in winter and 27psi in summer (needed more grip in winter)

another problem may also be the muddies digging into the sand - theyre called muddies cos theyre meant for mud =)

the muddies didnt dig as much as i thought they would, the problem was that the sand was quite boggy on monday, on both low and high reaches of the shore, and the tyres sunk in a trench (almost 65mm) before they could go anywhere.

[cutzook]

i run around 5 psi with my 33 inch claws on rocks and dirt and have never popped a bead.

[84ZOOKSTA]

I run 6psi off road and 30psi on road with Simex Extreme Trekkers. i have tubes and have never done a bead.

Simmo.

[HRZOOK]

Mate I also own a Coily

Get gearing that is all I can say

Even for sand

I have the Series 3 rockhopper it is awesome in high range on the sand on my road 30's

Before gearing with 30's even at 5psi was a struggle

[nicbeer]

Ditto on the pressures.

I went up there on the weekend and was running 5psi in my 31's. no probs.

Always boggy up there.

cheers