Higher Boost Or Lower Ratio

[mud rover]

JUST BOUGHT A 96 DISCO. IT HAS A SMALL LIFT AND 245/75/16 BFG MUDDIES.WITH THE BANK MANAGER/3GST's AND A LOAD IN THE REAR IT STRUGGLES WITH HILLS. AM LOOKING AT 33's AND LIFT TO SUIT. WHAT WOULD BE BEST. MORE ENGINE POWER OR LOWER DIFF RATIO'S ?:confused: :truck: P.S TDI AUTO

[ROVERNIT]

Both would be good :thumb:

ratio for off road more power for on road :thumb:

[mud rover]

How Far Can A Tdi Be Boosted. And Still Be Reliable. Will Be Doing Bulk Highway Work. EVERY ONE MENTIONS 4.11 DIFFS. WILL THAT BRING ENGINE SPEED BACK TO NORMAL.IS THAT RATIO STD OR AFTERMARKET?

[ROVERNIT]

Playing with boost alone is dangerous in my opinion, its the chapest option but macking around with boost may cause turbo lag however a few PSI shouldnt hurt

[cloughy]

Playing with boost alone is dangerous in my opinion, its the chapest option but macking around with boost may cause turbo lag however a few PSI shouldnt hurt


Please explain how it causes lag, and why playing with boost is dangerous??



Mud rover, The Tdi is already running enough boost, its the fuelling that requires tampering, best to fit a pyrometer and fuel it up, the gears are an excellent option, yet expensive, fuelling it up is free plus a pyro, then if your still not happy, go the 4.11's, oh their aftermarket by the way

[mud rover]

call me stupid. but what is a pyrometer? don't they measure air fuel ratio?more fuel = more power.but isn't that dangerous in a diesel?wouldn't more boost make more fuel more acceptable?dangreous as in more heat

[mud rover]

thanku for any help..........all advice welcome-----all criticism considered-----all smartar** comments ignored........

[cac]

i would be reluctant to raise the boost without first considering the extra strain it will place on the rest of the drivetrain, and how well they will handle the extra herbs....

there are other problems with increased boost too....one being increased heat from the turbo, so you may find your intercooler is no longer effective, and you end up no better off as a result...if ur vehicle is not fitted with an intercooler, then winding the boost up can result in you losing power rather than gaining it

another one you may run into is that your fuel pump and injectors may not be able to supply enough fuel to the engine to prevent the mixture leaning out too much....or in some cases the factory ECU won't be able to supply the extra fuel required....

if it were my truck, i would be fitting a larger exhaust, bigger intercooler, some form of aftermarket ECU, and maybe bigger injectors/pump, before looking at turning the boost up on the turbo

[edddo]

gday
the tdi does already run a highish boost (abt 20psi I think). The typical way a tdi owner gets better performence is;
1 tweak the fuel pump
2 fit aftermarket intercooler
3 high flow exhaust

the first option is the most cost effective and you would be surprised how much you will get from doing this. Most tdi owners do this. YOu need to have it done by someone who knows what they are doing and most prefer to have EGT gauges fited at the same time to avoid the damage that high egt can cause. For a couple of hundred dollars you can transform the feel of your car.

the intercooler replacement is also worthwhile but more expensive

the exhaust optionseems to offer some improvement but the standard tdi system is not too bad.

I have an auto tdi disco and have done the first 2 options-it is a totally different car to drive now.

Another thing to have checked is your pump timing and when you have the cam belt (every 80000) done make sure you take it to an experience fitter as a small timing error can crucify performance.

cheers

[TonyH]

Mud Rover, a pyro is a "pyrometer". It measures exhaust gas temp (EGT) which needs to be kept to under 550 or thereabouts under the highest continued engine load. More deisel = a higher egt, but too much and pistons etc can melt.

RE the extra strain on the running gear, I'm guessing you mainly want it for maintaining cruising speed, so the extra grunt will only mainly be used when the car is already running, meaning considerably less load than going from stationary to accelerating. But if you're gonna be doing the traffic light GP then drivetrain strength should be considered.

[Disco98]

I just fitted 4.11:1 aschroft diff ratios to my disco and they are great, i can pull up hills now with my 32's easy as piss, and my fuel consumption has gone from 11L/100km down to 9.5L/100km.

I have seen dyno charts for Tdi engines that have had the fuel pump tweek done and the last one i saw had a 62% increase in power over standard trim, you wouldnt get this much if you left the ratios the same, but it would go like a rocket with both. I am thinking about getting this done, he was charged about $800 from a bloke in melbourne, i am told it is quite easy to DIY but i dont think a fuel pump is something i am willing to mess with. I was also told that an EGT Sensor is a must with the fuel pump tweek. Matt

[mud rover]

thanks 2 all. gives me a few ideas 2 think about .maybe ECU and intercooler first.

[cloughy]

thanks 2 all. gives me a few ideas 2 think about .maybe ECU and intercooler first.

You don't have an ECU;)

[Disco98]

thanks 2 all. gives me a few ideas 2 think about .maybe ECU and intercooler first.

As cloughy said your truck doesnt have an ECU, the Tdi's are all mechanical. Your only option would be a fuel pump tweek and a larger intercooler

[mud rover]

:crazy: thats what i get for bying a rover with a diesel. never owned either one until now:truck: :thumb:

[sclarke7171]

You have one of the best and easiest Diesels to play with...

Wind the pump up and fit a bigger intercooler and Exhaust...

But... how many km has it done???

[Andrew8683]

You have one of the best and easiest Diesels to play with...

Wind the pump up and fit a bigger intercooler and Exhaust...

But... how many km has it done???

hey mate havent seen you on here for a while wht happen to ya old defender 'camilla' that you sunk in vic high country? i

[Muddydigger]

Id suggest that turbos diesels need to breath better. I would look at exaust,get a bigger one, then a larger intercooler. See how you go from there.

[ROVERNIT]

IMO and I don't know much about Diesel turbo but just boosting safely you get what about 4-5 psi and even that is straining the engine yeah sure muck around with the mixtures make it run a little more richer great but is it safe


I would do the ECU and exaust wouldn't worry all that much about a intercooler


at the end of the day its 4x4 not a sports car some more herbs are great but what exactly do you expect


if its off road grunt change the ratio to 4.11 but what tyre size do you run

:confused: :confused: :confused: :confused: :confused: :confused: its one of those things

[Muddydigger]

IMO and I don't know much about Diesel turbo but just boosting safely you get what about 4-5 psi and even that is straining the engine yeah sure muck around with the mixtures make it run a little more richer great but is it safe


I would do the ECU and exaust wouldn't worry all that much about a intercooler


at the end of the day its 4x4 not a sports car some more herbs are great but what exactly do you expect


if its off road grunt change the ratio to 4.11 but what tyre size do you run

:confused: :confused: :confused: :confused: :confused: :confused: its one of those things


It doesnt have an ECU its not a TD5, its mechaniacal injection. my understanding is, Turbo Diesels need to breath, and a bigger exaust will do that, but playing with the mixtures to richen it up?? If you dont match the fuel with air allyour doing is throwing un burnt black soot out the exaust. It needs a bigger Intercooler to get more dence air and cooler, hence better burn, it doesnt need more fuel it needs more of both, air and fuel.

[sclarke7171]

hey mate havent seen you on here for a while wht happen to ya old defender 'camilla' that you sunk in vic high country? i

Camila lives in Warnambool now.. sold her as i wanted a Ute...

So i built up a Defender 300tdi ute and still got it...
Thinking of selling it as the County needs a few $$$ spent on it..
Its getting an auto and 3.9 and rover diffs all round...

[sclarke7171]

IMO and I don't know much about Diesel turbo but just boosting safely you get what about 4-5 psi and even that is straining the engine yeah sure muck around with the mixtures make it run a little more richer great but is it safe


I would do the ECU and exaust wouldn't worry all that much about a intercooler


at the end of the day its 4x4 not a sports car some more herbs are great but what exactly do you expect


if its off road grunt change the ratio to 4.11 but what tyre size do you run

:confused: :confused: :confused: :confused: :confused: :confused: its one of those things


Can i suggest some really simple advice....
When someone post a question they want an answer, not a IMO.....

FACTS
The 200 and 300 tdi in Disco's are running at 14 psi or close to, Not 4-5psi
No it is not Straining the engine.... a diesel is nothing like a petrol engine... they are built tougher.

Why change the ratio to 4.11????
The 300 engine is perfect for tweeking...

Get a EGT, install it... check the Exhaust temp. Then keep it under 650deg C. Then take it to a repairer who knows what he is doing if your not happy with tweking the pump..
Get the pump tweeked for its maximum output with little smoke.
Then if your not happy do the Exhaust and intercooler..

But if the engine has done a few k's.... Leave it alone...

My Last defender was a 200tdi, i would the pump up and kept it under 650deg C, it was great in the bush and everyone hated the smoke.
Exhaust was std and so was the intercooler...

Current Defender.. 300tdi... Dead stock... i dont need the extra grunt as i drive it to its capability...

If you want a fast Landrover...... Buy a D3..... or Rangie Sport....

[cloughy]

[SIZE=2]IMO and I don't know much about Diesel turbo

Yep, hole in one ;)

[mud rover]

You have one of the best and easiest Diesels to play with...

Wind the pump up and fit a bigger intercooler and Exhaust...

But... how many km has it done???



just under 170 thou

[Disco-tastic]

gday
the tdi does already run a highish boost (abt 20psi I think).


Im pretty sure they run up to 10psi, they're only a small bushes turbo and they dont spin THAT fast

[Disco-tastic]

another option is the diesel gas conversion. Virtually eliminates smoke and give you about 20-30% more power and better fuel economy (I can check stated figures off the flyer i got, but its 11:30 at night and the flyers in the car) Im also running a bigger intercooler, but it doesnt make that much difference cos it gets clogged up with mud easy and is hard to clean properly.

I've got 32's and they're only really a problem starting on steep hills. Lowering your diff ration would compromise your touring ability. Mine sits at 2thou at 110kph.

My best advice is talk to a landrover specialist. They should know em back to front and can give you the best advice for your budget.