need more power for towing my caravan

[makeitfit]

I've got a Tunit II on mine and KnN filter in the box, cold air in via air scoop. It's like an extra gear
Intercooler fan does work well off road but it is designed to allow air to flow through it at sped with no prob or resistance to speak of. Although no imperical proof I'm sure it actually helps keep the engine bay cool too:thumbs and so keeps response quick:sly
As I've got 33s on my truck there's a lot of extra work for the engine, bit like a tin tent , but tunit keeps the truck in front of std ones:naughty

 

[briggie]

theres not a lot you can do with a td though is there ?

 

[makeitfit]

theres not a lot you can do with a td though is there ?

'cause there is.....................stick some LPG up it :sly
That'll be good for at least 30 BHP :naughty

 

[geoffdown]

I've got a Tunit II on mine and KnN filter in the box, cold air in via air scoop. It's like an extra gear
Intercooler fan does work well off road but it is designed to allow air to flow through it at sped with no prob or resistance to speak of. Although no imperical proof I'm sure it actually helps keep the engine bay cool too:thumbs and so keeps response quick:sly
As I've got 33s on my truck there's a lot of extra work for the engine, bit like a tin tent , but tunit keeps the truck in front of std ones:naughty

ok some people say take it out of the airbox and some say leave it in what is the right thing to do:nenau

 

[makeitfit]

It's just a case of getting COLD air to the engine. So if the KnN is in the air box it'll be getting nice cold air:thumbs

 

[kbekl]

It's just a case of getting COLD air to the engine. So if the KnN is in the air box it'll be getting nice cold air:thumbs

it will be restricting how much of that cold air it sucks in due to the diameter of the filterbox

this is what i was told when i bought one :nenau

 

[briggie]

i dont reccomend anyone does this , but ... when i used to race motorbikes back in the 70s , my mechanic removed my air filter for one race and put a funnel type thing on instead ..... the bike went like a rocket , or seemed to do

 

[makeitfit]

it will be restricting how much of that cold air it sucks in due to the diameter of the filterbox

this is what i was told when i bought one :nenau

Barrocks, look here and you'll see intake is as big as the turbo:thumbs

 

[geoffdown]

Barrocks, look here and you'll see intake is as big as the turbo:thumbs

thats what i was aiming for i want to fit a snorkel but not a home made 1 as its my family car i was looking at disco snorkels would they be able to be forced sorry i mean made to fit the terrano as they r cheap and loads around to get hold off

 

[makeitfit]

I've no idea about discos , except they get stuck alot:lol
I guess you could modify it if the screen angle looks right:nenau

 

[MudLifeCrisis]

Keep the K&N in the box. Mine overheats big time when towing with the filter uncovered.


Brian

 

[Timbo_1975]

it will be restricting how much of that cold air it sucks in due to the diameter of the filterbox

this is what i was told when i bought one :nenau

The stock airbox is fine, it is the oval inlet pipe and the plastic duct that is very restrictive.

 

[Timbo_1975]

What is the difference between a remap and a powerbox type addition (not the cheap 25p resistor type that simply enrich, more the tunit types) in terms of adjusting ecu?



The Plug-in power boxes just increase fuelling a certain amount over the whole rev range- so the curve would be exactly the same as the factory map, just x% taller, so they rely on the factory map to be somewhere near, just not enough. They only alter fuelling.

A remap is completely optimised at all rpms and loads and may well be a completely different 'shape' (a fuelling map is represented as a 3D graph) As well as the fuelling, timing will be altered at specific points too, as well as some other parameters where fitted.

If you are injecting more fuel, you generally need more timing advance because there is still a fixed time available to get all the fuel in, so start of injection needs to be sooner. A power box cannot do this.

We could go into alot of technical detail, but if a power box gives you enough extra then be satisfied with that. Under most conditions the 2.7 is totally fine with such a device provided it and the cooling system is in good order to begin with.

If you are looking to do the job properly, then ~£100 extra will give you a good remap (done live) with even better results on the stock engine. I've run a 2.7 with firstly a PSI box and subsequently a remap and on even a stock engine the difference is quite startling. At that point you are bordering on what the clutch can cope with, so to go further starts costing.

 

[lacroupade]

Keep the K&N in the box. Mine overheats big time when towing with the filter uncovered.


Brian

I've done 300,000 miles or more in four of these trucks over the last 14 years with an induction kit fitted, towing everything from a twin-axle Williams 2800kg flatbed to a dirty great twin axle box trailer loaded to the gills with building materials on a 1000 mile trip to SW France in the height of summer (with four passengers to boot).....never had an overheating problem so I'd suggest you must have some underlying issue maybe?? It certainly isn't down to the induction kit per se.

 

[Deleted account DD]

I've done 300,000 miles or more in four of these trucks over the last 14 years with an induction kit fitted, towing everything from a twin-axle Williams 2800kg flatbed to a dirty great twin axle box trailer loaded to the gills with building materials on a 1000 mile trip to SW France in the height of summer (with four passengers to boot).....never had an overheating problem so I'd suggest you must have some underlying issue maybe?? It certainly isn't down to the induction kit per se.

I would tend to second that. Did quite a lot of towing in the time i had the t2 and I didnt notice any difference between hot and cold running with the induction kit fitted.

I tend to suspect if youre being scientific (aka anal) the temp is important but in practical terms in the real world the impact is negligible :nenau

 

[Deleted account DD]

What is the difference between a remap and a powerbox type addition (not the cheap 25p resistor type that simply enrich, more the tunit types) in terms of adjusting ecu?



The Plug-in power boxes just increase fuelling a certain amount over the whole rev range- so the curve would be exactly the same as the factory map, just x% taller, so they rely on the factory map to be somewhere near, just not enough. They only alter fuelling.

A remap is completely optimised at all rpms and loads and may well be a completely different 'shape' (a fuelling map is represented as a 3D graph) As well as the fuelling, timing will be altered at specific points too, as well as some other parameters where fitted.

If you are injecting more fuel, you generally need more timing advance because there is still a fixed time available to get all the fuel in, so start of injection needs to be sooner. A power box cannot do this.

We could go into alot of technical detail, but if a power box gives you enough extra then be satisfied with that. Under most conditions the 2.7 is totally fine with such a device provided it and the cooling system is in good order to begin with.

If you are looking to do the job properly, then ~£100 extra will give you a good remap (done live) with even better results on the stock engine. I've run a 2.7 with firstly a PSI box and subsequently a remap and on even a stock engine the difference is quite startling. At that point you are bordering on what the clutch can cope with, so to go further starts costing.

Interesting stuff and I do understand what youre saying :thumb2

But..............


Are you effectively saying the tunit box to pick on one brand is simply a selective overfuel device and not a lot difference from the 25p resistor type?

Also if it works on the principle of overfuelling why does consumption drop ? definitely did on mine with the psi .


:nenau


I do seem to recall reading that the better powerboxs do alter ignition or fuel curve/timing, ive emailed them and tunit for comment, Ill post the answer if/as/when it arrives :thumb2

 

[geoffdown]

Interesting stuff and I do understand what youre saying :thumb2

But..............


Are you effectively saying the tunit box to pick on one brand is simply a selective overfuel device and not a lot difference from the 25p resistor type?

Also if it works on the principle of overfuelling why does consumption drop ? definitely did on mine with the psi .


:nenau


I do seem to recall reading that the better powerboxs do alter ignition or fuel curve/timing, ive emailed them and tunit for comment, Ill post the answer if/as/when it arrives :thumb2

great that would be good to no thanks:thumbs

 

[Timbo_1975]

Interesting stuff and I do understand what youre saying :thumb2

But..............


Are you effectively saying the tunit box to pick on one brand is simply a selective overfuel device and not a lot difference from the 25p resistor type?

Also if it works on the principle of overfuelling why does consumption drop ? definitely did on mine with the psi .


:nenau


I do seem to recall reading that the better powerboxs do alter ignition or fuel curve/timing, ive emailed them and tunit for comment, Ill post the answer if/as/when it arrives :thumb2

The tuning boxes that interupt the pump signal (go inline at the pump connector) have no means of altering timing on the VP37 pump, as they dont interupt the advance soloniod wiring, which is separate!

I did explain in very simplistic terms how the tuning boxes work, yes they do merely increase fuelling throughout the rev range by tricking the ecu. This amount is not a constant and varies on throttle opening and engine speed. At idle it will be 0% (so idle remains the same), at around 2000rpm the increase will be around about the most so lets say 30% more fuel, and then it tails off to say 20% at the top end. The ecu map is not a smooth graph either. You usually gain mpg due to the simple fact that you spend less time in the lower gears, reach cruising speed more quickly so you back off the throttle sooner, and also that you can hold a higher gear i.e lower rpm for longer.

 

[Deleted account DD]

all good stuff but the getting through the gears theory is possibly flawed as I drove a bit more "enthusiastically" went faster and still used less fuel :nenau

I'll wait on tunit and psi's comments :thumb2

So moving onto remaps.

Is it possible to obtain a predetermined remap profile? Ive got an obdII connector which I can plug into my laptop and see whats going on.

I understand there is software available to remap but I wouldnt want to do it by trial and error, a pre prepared profile would be nice