 | Home > Tdi > LT77 Gearbox ratio's & 200 tdi power/performance |
 
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| Kit Member Since: 12 Feb 2016 Location: Shropshire Posts: 1110   
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The gearbox might have been rebuilt at some point with a longer 5th, have you checked the old paperwork?
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9th Apr 2017 8:56pm |
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| ickle Member Since: 22 Jul 2010 Location: South Vendee Posts: 1808  
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I upped the boost pressure and tweaked the fuel on my 200 bitsa and it was superb!
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9th Apr 2017 8:58pm |
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| ickle Member Since: 22 Jul 2010 Location: South Vendee Posts: 1808
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- mine was also running 265's and a 1.2 transfer box
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9th Apr 2017 8:59pm |
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| LANDROVER Member Since: 13 Feb 2016 Location: EAST OF ENGLAND Posts: 216
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Shamefully the engine & gearbox was swapped prior to my purchase. They did'nt record anything for the swap. I took it as a unfinished project. The only paperwork I have was for prior to that
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9th Apr 2017 9:02pm |
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| LANDROVER Member Since: 13 Feb 2016 Location: EAST OF ENGLAND Posts: 216
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Did you run a EGT or Boost Gauge? My friend mentioned quite high BHP numbers being achieved years ago from 200/300 tdi's. I was reluctant to tune it when I bought it but having been using it for driving to work recently I realise that a little tune might be sensible. He suggested removing the the diaphram and adjusting the Diaphram spring pre-load to give it a bit more top end performance. He tunes his to get about 70mph in 4th gear......I don't drive that hard though  |
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9th Apr 2017 9:10pm |
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| Kit Member Since: 12 Feb 2016 Location: Shropshire Posts: 1110
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I am going to run an EGT and boost gauge before I start to fiddle with mine, although it goes quite well at the moment to be honest!
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9th Apr 2017 9:18pm |
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| ickle Member Since: 22 Jul 2010 Location: South Vendee Posts: 1808
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I set it with a gauge at about 18psi boost, didn't leave it connected when done though, adjusted fuel until it only smoked on very hard acceleration, 70 in 4th no problem, 85 on the motorway again no issues, MT tyre noise seemed to be the limiting factor.
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9th Apr 2017 9:19pm |
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| LANDROVER Member Since: 13 Feb 2016 Location: EAST OF ENGLAND Posts: 216
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I think mine is a bit lacking though I drive fairly gentle. I'm running Insa Specials, lift & external roll cage...and two winches...so I'm carrying a bit of extra weight but nothing major. Sounds like I better have a play and see what I can gain.  |
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9th Apr 2017 9:25pm |
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| Kit Member Since: 12 Feb 2016 Location: Shropshire Posts: 1110
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I was running 33x12.5 but no extra weight 1993 200 Tdi 90 CSW
1956 Series 1 Hard-top 1958 Series 1 Soft-top |
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9th Apr 2017 9:26pm |
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| LANDROVER Member Since: 13 Feb 2016 Location: EAST OF ENGLAND Posts: 216
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Ahh...mine must need setting up as I get about 50mph is where it stops pulling in 4th and in 5th about 65ish...though I have not really tried max speed! My friend said it seemed like the throttle was not opening enough! Did you T into the wastegate pipe to measure boost? I gather 18psi is the sensible max. I run a massive intercooler. Would you suggest that I check EGT after tuning? Did you adjust the diaphragm & diaphragm pre-load for fuelling? Thanks for your help. |
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9th Apr 2017 9:38pm |
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| LANDROVER Member Since: 13 Feb 2016 Location: EAST OF ENGLAND Posts: 216
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I was running 33x13.50x15 Maxxis Mudzilla's but swapped to 265/75/16 now...improved the handling.. 
Thanks for your advice and help. |
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9th Apr 2017 9:47pm |
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| ickle Member Since: 22 Jul 2010 Location: South Vendee Posts: 1808
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It was several years ago now, but I took the pressure at the manifold, sorry can't remember if I drilled and tapped it or t'eed into it somewhere, I also ran a huge intercooler and straight through 3" exhaust.
As I wasn't doing anything out of the ordinary, I never bothered with the exhaust gas temp, there were no issues in the 7 years I used it or in the 3 years after I sold it, the next owner I think ran it with the radiator & intercooler full of mud and cooked it. There is a very good write up on line on how to tune the 200tdi, I can remember shortening the rod on the turbo and altering the screws on the pump, but its too long ago now for details - it must be my age! good luck Keith |
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10th Apr 2017 5:24pm |
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| benniferj Member Since: 20 Oct 2016 Location: Basingstoke Posts: 361 
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I'm on a 200tdi/Lt77 with a 1.6 transfer box, 285/75/16s. For me I think this gives me a slightly poor gearing with some of the ratios being in between where they want to be. I think a 1.4 transfer box would probably shift everything back into place with the bigger wheels nicely.
I'm in the process of sorting out tweaking the pump, I'm running about 15psi boost 'says the gauge' and I have tapped my exhaust manifold with a 1/8npt probe - sadly faulty out of the box so waiting for the new probe to arrive! Then I will tune the pump and maybe I can get away without changing the ratios if it gives me a bit more low rev fuelling bite. |
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11th Apr 2017 8:14am |
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