torquing diesel - Motorhome Forums, Motorhome Discussion, Motorhome Chat

User Tag List

 
LinkBack Thread Tools
post #1 of 8 (permalink) Old 23-08-2011, 20:43 Thread Starter
Member
 
Tissy's Avatar
 
Join Date: Jul 2010
Location: Bewdley
Posts: 84
Thanks: 0
Thanked 0 Times in 0 Posts
torquing diesel

did anyone see this company at malvern this weekend
the increase in power and the reduction in fuel compsumption will soon have this unit paid for.
has anyone got one fitted?
tissy
Tissy is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 23-08-2011, 21:14
Senior Member
 
Join Date: Mar 2011
Location: Mid Wales
Posts: 341
Thanks: 0
Thanked 0 Times in 0 Posts
I would be inclined to use more established companies like boostersuk or WOW, if something goes wrong or there is a hicup, you will an experience engineer to put it right.

I stayed on the MHF at the Malvern Show, It was mentioned last year a motorhome had to be towed of site after remapping.

boostersuk remapped my Autotrail Cheynne 660 2008 at the Malvern Show, it pulls a lot better, however, I am a little suprised how much smoother the motorhome performs.
Oscarmax is offline  
post #3 of 8 (permalink) Old 23-08-2011, 21:16
Senior Member
 
javea's Avatar
 
Join Date: Jun 2007
Location: Nottinghamshire France and Spain
My Motorhome: Hymer B544SL
Posts: 2,609
Thanks: 18
Thanked 97 Times in 90 Posts
If I were you I would not entertain a plug in device, all they do is pump more fuel into the engine to give you more power but less mpg. Had one some years ago, if I wanted more performance or more economy I would go for an engine remap which is a much more sophisticated operation.

Remember, at the end of the day you can't have increased performance and more economy, it's a choice of one or the other. The increase in torque with a remap could be very useful in climbing steep hills or towing but if you keep your foot down to use the increased performance you will pay for it at the pump.
javea is offline  
 
post #4 of 8 (permalink) Old 23-08-2011, 22:21
747
Senior Member
 
747's Avatar
 
Join Date: Oct 2009
Location: Gateshead
My Motorhome: Burstner Delphin Performance T821
Posts: 8,433
Thanks: 7
Thanked 42 Times in 38 Posts
Personal Aire
Quote:
Originally Posted by javea
If I were you I would not entertain a plug in device, all they do is pump more fuel into the engine to give you more power but less mpg. Had one some years ago, if I wanted more performance or more economy I would go for an engine remap which is a much more sophisticated operation.

Remember, at the end of the day you can't have increased performance and more economy, it's a choice of one or the other. The increase in torque with a remap could be very useful in climbing steep hills or towing but if you keep your foot down to use the increased performance you will pay for it at the pump.
Not so I am afraid.

I have a Tunit box fitted (2.8 jtd on a van with 5 ton MAM). I get at least the same fuel economy as a van without the plug in box and possibly slightly more.

I would be suspicious of any company who claims big gains in economy. It occasionally happens but that is due to the engine being badly set up from new. Any gains in mpg comes from the fact that you get up to cruising speed quicker and consequently get through the gears quicker.

Economy starts at the right foot of the driver more than anything else. Cruising at too low revs in top gear is not economical. Changing up too early is not very economical either.

There are many reasons apart from remaps or addons.

Nil Desperandum Illegitemide Carborundum
747 is offline  
post #5 of 8 (permalink) Old 23-08-2011, 22:35
Senior Member
 
javea's Avatar
 
Join Date: Jun 2007
Location: Nottinghamshire France and Spain
My Motorhome: Hymer B544SL
Posts: 2,609
Thanks: 18
Thanked 97 Times in 90 Posts
Hi 747,

You might be interested in the following comment from a specialist tuning company:


*The job of the tuning box is to fool the ecu to thinking the rail pressure is lower than it really is or the air temp is lower.* Telling the ecu the rail pressure is lower or the temps are lower will result in extra fuel being into the engine by the ecu.* Yes it works fine you get the extra kick of power which puts a grin on your face.* down side is cylinder bore wash which is not good for the engine long term, blocked EGR sytems.

A remap will change the requested boost, fuel rail pressure,* capped software*torque limiters, fuel quantity all in a liner fasion. The added boost will allow all the fuel to burn away nice and clean so no black smoke and no washing out the bores. The end result should be a very strong smooth powerful delivery of torque which holds strong across the whole rpm range.

The difference between a tuning box and a remap is day and night. IMO sell the tuning box and take a trip to AMD so they can transform the 3.0TDI beast.

*
javea is offline  
post #6 of 8 (permalink) Old 24-08-2011, 13:58
747
Senior Member
 
747's Avatar
 
Join Date: Oct 2009
Location: Gateshead
My Motorhome: Burstner Delphin Performance T821
Posts: 8,433
Thanks: 7
Thanked 42 Times in 38 Posts
Personal Aire
Hi javea,

I regard the remap as a waste of money on a RHD 2.8 jtd for the simple reason that it has a smaller turbocharger fitted than the LHD version. The power has been reduced from 142 bhp to 127 bhp (I believe those are the correct figures). My van has previously had a replacement turbo fitted by the previous owner as he towed a WW2 Willy's Jeep on a trailer. Too much power needed.

I broadly agree with your reasoning of how the add on box works and some are better than others. If I had the 3.0 litre engine on the X2/50, I probably would not need anything doing to the engine unless it struggled on hills.

I would just add that my Tunit box has a number of incremental stages for setting the jumper. Each one equates to an extra 5 bhp and I am happy with mine set at the mid-point of the range. It will never be a racehorse but at least I can retain 5th gear longer on inclines. I have nothing against remaps (or add on boxes), each to his own.

Nil Desperandum Illegitemide Carborundum
747 is offline  
post #7 of 8 (permalink) Old 24-08-2011, 14:23
Senior Member
 
Join Date: Mar 2006
Location: N Wilts
Posts: 220
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by 747
Hi javea,

I regard the remap as a waste of money on a RHD 2.8 jtd for the simple reason that it has a smaller turbocharger fitted than the LHD version. The power has been reduced from 142 bhp to 127 bhp (I believe those are the correct figures). My van has previously had a replacement turbo fitted by the previous owner as he towed a WW2 Willy's Jeep on a trailer. Too much power needed.

I broadly agree with your reasoning of how the add on box works and some are better than others. If I had the 3.0 litre engine on the X2/50, I probably would not need anything doing to the engine unless it struggled on hills.

I would just add that my Tunit box has a number of incremental stages for setting the jumper. Each one equates to an extra 5 bhp and I am happy with mine set at the mid-point of the range. It will never be a racehorse but at least I can retain 5th gear longer on inclines. I have nothing against remaps (or add on boxes), each to his own.
+1 and my Tunit on on a 2.2 Merc 313 CDI A Class with Sprintshift. Before it was lucky to give 20 mpg and very poorly on hills. Now 24 solo and 22 mpg towing 2000kg (car & trailer) and rarely causes holdups on long hills. I have mine on 7!

Also depends on whether you use the adidtional urge sensibily ( I stay under 60 except downhill!!) It is quite capable of exceeding 80+ on a private road.........

Trev
macone48 is offline  
post #8 of 8 (permalink) Old 24-08-2011, 16:42
747
Senior Member
 
747's Avatar
 
Join Date: Oct 2009
Location: Gateshead
My Motorhome: Burstner Delphin Performance T821
Posts: 8,433
Thanks: 7
Thanked 42 Times in 38 Posts
Personal Aire
Hi Trev,

I do not know how old your Tunit box is but if it is an old model I might have some helpful information for you.

Mine was bought around 2003 - 2004. I decided to ask if it could be checked out and I was told to send it back to Tunit. They flashed it over with a newer programme and it is better than it was before. It only cost £20 (inc P & P) and I got it back 2 days after sending it.

Contact Martin Bashforth, Tunit, Leigh St., Chorley, Lancs., PR7 3DS

Tel: 01257 274100

Nil Desperandum Illegitemide Carborundum
747 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Motorhome Forums, Motorhome Discussion, Motorhome Chat forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome