dred90 Posted April 17, 2007 Share Posted April 17, 2007 I've just bought a challenge 200 tdi 90 with 4.11 diffs, discovery transfer box and simex 35's. Just wondered what effect these mods would have on the acceleration in the higher gears. It seems to me to be way down on power in 3rd and 4th particularly on hills compared to my previous 200 tdi. I first thought that it may have some kind of problem with the turbo, but the previous owner assures me its down to the tyre / gearing combo. Anyone gone to a similar setup, with the same effect As always any advice much appreciated.. Ed B Quote Link to comment Share on other sites More sharing options...
western Posted April 17, 2007 Share Posted April 17, 2007 probly down to diffs at 4.11:1 & transferbox at 1.2:1 with 35 inch tyres it's most likely the wrong gearing setup. Quote Link to comment Share on other sites More sharing options...
Ex Member Posted April 17, 2007 Share Posted April 17, 2007 Ummmmm..... It is the tyres. 35" tyres eat power. Gearing sounds OK for that size of tyre. Is the boost and fueling stock? If so, there is lots of room for improvement. Quote Link to comment Share on other sites More sharing options...
JST Posted April 17, 2007 Share Posted April 17, 2007 i have a std 200tdi with 1.4T box and 3.54 diffs and with 35 tyres on she struggles in 5th. all others are OK. with 1.2T box i would expect her to struggle in 4th maybe 3rd. Bet shes not pulling many revs when your up into 4/5th. 5th with 1.4 is almost redundant on the main roads around here with 35"s on IME edited: oops, 4.11 changed to 3.54 Quote Link to comment Share on other sites More sharing options...
will_warne Posted April 18, 2007 Share Posted April 18, 2007 i have a std 200tdi with 1.4T box and 4.11 diffs and with 35 tyres on she struggles in 5th. all others are OK. with 1.2T box i would expect her to struggle in 4th maybe 3rd. Bet shes not pulling many revs when your up into 4/5th.5th with 1.4 is almost redundant on the main roads around here with 35"s on IME I'd agree with both James and Red90 - its a combination of both. I reckon a 1.2T and 4.11's is a touch high for a challenge truck - you'd be better off with a 1.4 ratio box. Also, Simex (or any aggressive tyre for that matter) eat power whatever their size. Just think of all the noise (and heat) they make - its power lost through the rolling resistance / tread block vibration. My advice would be to get the gearing lower as you'll still be able to hit the national speed limit on a motorway, it'll be quicker off the line and far less work on A-roads. Quote Link to comment Share on other sites More sharing options...
white90 Posted April 18, 2007 Share Posted April 18, 2007 i have a std 200tdi with 1.4T box and 4.11 diffs and with 35 tyres on she struggles in 5th. all others are OK. with 1.2T box i would expect her to struggle in 4th maybe 3rd. Bet shes not pulling many revs when your up into 4/5th.5th with 1.4 is almost redundant on the main roads around here with 35"s on IME when did you fit 4.11s then? Quote Link to comment Share on other sites More sharing options...
Guest WALFY Posted April 18, 2007 Share Posted April 18, 2007 I was wondering the same thing. Quote Link to comment Share on other sites More sharing options...
Holyzeus Posted April 18, 2007 Share Posted April 18, 2007 Mine has 35" Simex's, standard diffs (i think ), standard transfer box but bigger intercooler and tweaked pump was surprised at how quick off the mark she can be all things considering Quote Link to comment Share on other sites More sharing options...
Ex Member Posted April 18, 2007 Share Posted April 18, 2007 That is why I ask if it is stock or tweaked. Personally, I would stay with the gearing and up the power!!!! Quote Link to comment Share on other sites More sharing options...
dred90 Posted April 18, 2007 Author Share Posted April 18, 2007 Mine has 35" Simex's, standard diffs (i think ), standard transfer box but bigger intercooler and tweaked pump was surprised at how quick off the mark she can be all things considering Yes my old one had the tweaks and the intercooler done, but this one is standard. I'm just finding it hard to believe that this lack of oomph in higher gears is down to the gearing / tyres alone. Put your foot down in 3rd or 4th on even a shallow hill and doesnt seem to have any torque whatsoever.. Quote Link to comment Share on other sites More sharing options...
white90 Posted April 18, 2007 Share Posted April 18, 2007 gearing will do that for sure start adjusting Quote Link to comment Share on other sites More sharing options...
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