 | Home > Technical > Advice please - tbox ratios |
 
|
|
|
| Cheshire110 Member Since: 26 Jul 2013 Location: Cheshire/London Posts: 2760  
|
no experience with tdi autos sorry, but 2700 ish rpm sounds more than enough to me for top gear @ 70.
Obviously a manual 2.4 tdci has more power than an auto tdi but my 110 (2.4) copes fine and 70 comes up around 2350rpm, and it'll accelerate up some fairly steep hills in top gear up to the limited top speed of 82. Only thing is, if you drive at 70/75 on motorways etc, then 2700-3000rpm may get a bit noisy and uneconomical? Don't know a lot as I said but could an overdrive and lower gearing together be a good option? Cheers, David Land Rovers of all shapes S3 onwards… Daily is a 110 V8. |
||
22nd Apr 2014 10:03am |
|
| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
|
Ashcrofts advice is spot on. Your truck is over-geared and changing to the 1.4 box will solve this.
Comparing it to a Puma Defender is meaningless, I'm afraid, as the gear ratios and engine characteristics are completely different. Darren 110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
||
|
22nd Apr 2014 10:41am |
|
| grafty99 Member Since: 15 Aug 2012 Location: North Devon Posts: 4786 
|
Surely a tdi engine, properly setup with a VGT turbo would have the power to pull that kind of gearing? 2002 90 Td5 Station Wagon
1990 Vogue SE Triumph Tiger Explorer 1200 Td5 90 Thread http://www.defender2.net/forum/topic50767.html Tdi 110 Thread https://www.defender2.net/forum/topic69562.html RRC Thread http://www.defender2.net/forum/topic54492.html Instagram http://www.instagram.com/george_grafton |
||
|
22nd Apr 2014 4:04pm |
|
| Alex1976 Member Since: 23 Jan 2013 Location: Buckingham Posts: 596 
|
I wasn't sure at first if it was lack of power/engine issues that was the problem, but it doesn't seem to be as there is plenty of power and go generally, it is just the problem of maintaining speed on motorways when there is an incline, it seems to struggle.
So I am thinking the 1.4 Tbox is what is needed. Thanks for the replies. |
||
|
22nd Apr 2014 4:09pm |
|
| Romadog Member Since: 07 Jul 2011 Location: Powys Posts: 1749 |
Now I was thinking of going the opposite with my V8 !
Rechecking calculator......... |
||
|
22nd Apr 2014 5:22pm |
|
| grafty99 Member Since: 15 Aug 2012 Location: North Devon Posts: 4786
|
Aren't there different torque converter sizes as well? 2002 90 Td5 Station Wagon
1990 Vogue SE Triumph Tiger Explorer 1200 Td5 90 Thread http://www.defender2.net/forum/topic50767.html Tdi 110 Thread https://www.defender2.net/forum/topic69562.html RRC Thread http://www.defender2.net/forum/topic54492.html Instagram http://www.instagram.com/george_grafton |
||
|
22nd Apr 2014 8:48pm |
|
| barbel jim Member Since: 12 Dec 2012 Location: Northants Posts: 1423 
|
I'm looking to go the other way, could be interested in your old 1.2 box
 |
||
|
22nd Apr 2014 8:52pm |
|
| Mjibex Member Since: 21 Mar 2013 Location: Reading Posts: 283 
|
+ tyres that you run make huge difference - road or ATs very little drag, MTs quiet a bit more, simex or similar extreme drag.
|
||
|
23rd Apr 2014 11:48am |
|
| Alex1976 Member Since: 23 Jan 2013 Location: Buckingham Posts: 596
|
I am running 265/75R16 BFG AT's so shouldn't have too much of an adverse effect.
Ashcrofts do a larger torque converter option but they advise against fitting this unless you have 'a very tuned 300Tdi' or it has negative effects. I don't consider my 300tdi 'very tuned' so I am leaving the TC alone. I am swapping my 1.2 box in for a 1.4 from Ashcrofts so it's not up for grabs sorry. Alex |
||
|
23rd Apr 2014 12:51pm |
|
| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347 
|
Remember the max revs of a Tdi is 3850 so although 2700 sounds quite low, its actually top of the middle range.
|
||
|
23rd Apr 2014 1:25pm |
|
| g-mack Member Since: 07 Jan 2014 Location: northumberland Posts: 1967
|
couldnt imagine doing 70 for long in mine!
 im also thinking about 1:2 box to ease the revs !! My 109 thread
my youtube channel |
||
|
23rd Apr 2014 4:22pm |
|
| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347
|
I had to push to 70 this evening to get around a truck.
Never again  |
||
|
23rd Apr 2014 5:42pm |
|
| Alex1976 Member Since: 23 Jan 2013 Location: Buckingham Posts: 596
|
Well I placed an order for a 1.4 box from Ashcrofts today due to turn up next Weds so that's my BH weekend project sorted out
I know some people have said they think it will rev too high at 70, but it is definitely too low revs with the current box. It was fine when I had it mated to a R380 but now its on an auto its needs the extra revs the 1.4 will give. Once its in and I have driven it a bit I will let you know how it is. |
||
|
24th Apr 2014 6:59pm |
|
| Alex1976 Member Since: 23 Jan 2013 Location: Buckingham Posts: 596
|
Well I have been driving the Defender around this week with the new 1.4 T box in and I am really pleased. It now seems to be just right. Better acceleration and still does not feel too revvy at 70. It will hold speed without an issue on hills now too.
I changed to a yellow speedo gear and thisnowgives me exactly the samespeedoreading as the sat nav rather than the blue gear that used to read a lot under. Have to say I received first class service from Ashcrofts again. I can not rate Dave and his team highly enough. I mentioned that while I had the tbox out I was going to strip and clean the governor on the auto box and he threw the gaskets and seals I needed into the order for free. |
||
|
8th May 2014 7:50pm |
|
|
|
| All times are GMT |
< Previous Topic | Next Topic > |
Posting Rules
|
Site Copyright © 2006-2024 Futuranet Ltd & Martin Lewis
