Thread: 32s or 33s?

Originally Posted by lambrover

Did you adjust the boost as well, if you adjust the pump with out adjusting boost you are robbing your self of power gains and you will be running higher EGT's. Remember boost won't hurt the engine but high EGT's do.

I need some help: Lambrover (or any other who knows): how do I increase the boost in my 2.8 TGV engine? There are lots of explanatons on this forum and others on how to tweak the pump (which I have already done, moderately), but what about increasing boost? Can it be done at home? Is ther any póst on this that you could lead me to?

Thanks!
Stgo

Santiago, AFAIK you can't ?

That turbo is putting out maximum boost at revs ?

I've read anything from 18-20psi, much more than a stock 300Tdi turbo.

if it helps with anything......i am currently running 33 12.5 x15 on my 03 fender....only mod is a 2 inch spring lift.......

the taller sidewall gives a little more shake and wobble as can be expected......and you also notice a bit more tyre roll on hard cornering.....
this is compared to the factory 235 85R16.......but i like the rolling diameter and don't want to go back to the 32s.......
the speedo is now almost accurate......its about 15metres out over 5kms.....

BUT.....my backing plate just touches the rim on some corners......which is a very simple 5 minute fix with some sandpaper....or a file......
an angle grinder will take longer by the time i connect up extension cords and run them out to the car......

you are more than welcome to come and have a look/drive of mine if you like.....im in illawong.....near menai......

Originally Posted by DEFENDERZOOK

if it helps with anything......i am currently running 33 12.5 x15 on my 03 fender....only mod is a 2 inch spring lift.......

the taller sidewall gives a little more shake and wobble as can be expected......and you also notice a bit more tyre roll on hard cornering.....
this is compared to the factory 235 85R16.......but i like the rolling diameter and don't want to go back to the 32s.......

What pressure do you run on road?

Jeff

i was running 40psi in the factory rubber....general grabbers.....

but in these I'm running only 32......as the maximum pressure is only 36psi.....
these are very old tyres.....prob 20 years old......?

Been reading about highway and clearance benefits regarding 33" tyres, but what about low range capability.

3 of us all driving Defers were just down Cooma in some pretty hilly and slippery tracks.
The Tdi had 33" and a 30% reduction gear which the owner feels brings the car back to standard gearing with the tyres on.
The td5 has stock 32", and my puma has stock 31".

The TD5 and puma want to go to 33" next round, but wonder if we could loose some of the slow landy crawl. As we drove these hills in 2nd low, we would work these cars between 1300rpm and 2200rpm over the tracks. Virtually no wheel spin was present and they predictably crawled there way up, nice and safe.

I'm not keen to cough up for a reduction gear in the puma to keep low gear talk like standard, and not keen either to climb hills at 1690 and 2860rpm.

thoughts and experiences please

Originally Posted by newhue

Been reading about highway and clearance benefits regarding 33" tyres, but what about low range capability.

3 of us all driving Defers were just down Cooma in some pretty hilly and slippery tracks.
The Tdi had 33" and a 30% reduction gear which the owner feels brings the car back to standard gearing with the tyres on.
The td5 has stock 32", and my puma has stock 31".

The TD5 and puma want to go to 33" next round, but wonder if we could loose some of the slow landy crawl. As we drove these hills in 2nd low, we would work these cars between 1300rpm and 2200rpm over the tracks. Virtually no wheel spin was present and they predictably crawled there way up, nice and safe.

I'm not keen to cough up for a reduction gear in the puma to keep low gear talk like standard, and not keen either to climb hills at 1690 and 2860rpm.

thoughts and experiences please

Mine was not noticeably different to the 32" normal tyres, but I don't have a tacho and the Rover was empty. Might be different if filled up with two weeks food and camping gear.

Jeff

I don't think bigger tyres would hurt the Puma at all,as you'd know 1st low is lower than anything this side of a tractor. Pat