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better performance for diesel


dsb
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hay guys

ive had the terrano for a few months now and i am begining to miss the power of my old commodore,

 

im now looking in to the process of doing some mods to the motor,

i just want a bit better acceleration, and more power for the hiway

here is what i have in mind, (just remember its deisel)

 

1st larger exhaust system

2 cold air intake

3 tune up

4???

id really be intersted in your thoughts and advice

espesialy cos i know almost nothing bout doing up diesels.

Thanks

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interested in those pics as well jumper B)

I am also with a 92 td2.7 uncanny closeness in our licence numbers with mine being BNN723.

Is that pic of yours at red rocks welly?

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sorry for the late up date, my internet lost conection, somthing bout a digger hitting a cable,

 

anyway this is my progress so far,

got a quote for a 2.5 " exhaust system , only $380 which to me sounds realy good although it is mild steel, pres bent but that should be cool shouldent it?

 

then once that is done im fitting a snorkle and kn air filter.

 

 

jumper, i'd love to see those pics if you dont mind im realy interested in fitting an intercoolerand maby amping up the boos a little or even getting a better turbo

 

and that dieselgas thing looks promising kremmen although i will have to wait till they make the product more accessable up here in Queensland

 

by the way dose any one know the performance specks of the stock 2.7td by way of kw, torqe?

so thanks guys for all your help so far ill keep u posted as things progress and get some pics as i go along,

later,

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My diesel is a ford truck so the translation to yours is not my area but... the k&n has been extensively discussed on the truck site I read. The consensus is that it allows too much particulate matter through the filter (dirt etc). I went with another brand that tests better. K&N is too expensive anyway. Do some extensive searching for air intake replacements but I would advise to skip the kn. See if you can find testing results. Diesels are too expensive to risk dirt into the intake.

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  • 4 months later...

wel its been way to long since i started this post but ive finaly got some things done and some results:

 

first thing i did was fix the leaky fuel pump to deal with the sulphur content in the diesel and with that i notices an improvement in both economy (duh) and performance (only just)

 

next i replaced the water pump (no real improvement other than it ran cooler)

 

then i put togeather a custom air in take with a kn air filter* (large improvement in performance giving the pathy a nice burble in the exhaust)

 

i finaly saved enough to buy a sports exhaust, a mandrel bent 2.5 inch straight through (no muffler). )ha ha ha it now sounds like a mac truck and the turbo whisle is extreemly lould, verry large improvement in performance, noticable improvement in econemy )

 

ive also been useing a fuel additive which after a few tanks of fuel it has lived up to its prommices (more power, better econmy ect ect)

 

my stats so far:

 

fuel use- before: 400-450ks per tank

 

-after: 700-800ks per tank :D

performance

Before: will not spin wheels,

traffic light drag ;) yah maby against ...

scrap that ,just wouldent try it

after : will spinn wheels un till mid, high 2nd consistantly , with new tires.

traffic light drag: any thing up to heundy exl spec is a good chalange

 

 

After much reaserch and speaking with local 4x4 stores and both kn dealers and compeditors i have come to this conclusion about dust injestion: the kn filter only becomes a problem with dust when it is washed repeatedly at to close a intervals the cotten degrades and allows is reduced in affectiveness .

so aqs long as i main tain the filter at the spesified intervills i should be right.

 

next up in gunna give the motor a rest and work on the audeo system 4 a while

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  • 2 years later...
wel its been way to long since i started this post but ive finaly got some things done and some results:

 

first thing i did was fix the leaky fuel pump to deal with the sulphur content in the diesel and with that i notices an improvement in both economy (duh) and performance (only just)

 

next i replaced the water pump (no real improvement other than it ran cooler)

 

then i put togeather a custom air in take with a kn air filter* (large improvement in performance giving the pathy a nice burble in the exhaust)

 

i finaly saved enough to buy a sports exhaust, a mandrel bent 2.5 inch straight through (no muffler). )ha ha ha it now sounds like a mac truck and the turbo whisle is extreemly lould, verry large improvement in performance, noticable improvement in econemy )

 

ive also been useing a fuel additive which after a few tanks of fuel it has lived up to its prommices (more power, better econmy ect ect)

 

my stats so far:

 

fuel use- before: 400-450ks per tank

 

-after: 700-800ks per tank :D

performance

Before: will not spin wheels,

traffic light drag ;) yah maby against ...

scrap that ,just wouldent try it

after : will spinn wheels un till mid, high 2nd consistantly , with new tires.

traffic light drag: any thing up to heundy exl spec is a good chalange

After much reaserch and speaking with local 4x4 stores and both kn dealers and compeditors i have come to this conclusion about dust injestion: the kn filter only becomes a problem with dust when it is washed repeatedly at to close a intervals the cotten degrades and allows is reduced in affectiveness .

so aqs long as i main tain the filter at the spesified intervills i should be right.

 

next up in gunna give the motor a rest and work on the audeo system 4 a while

 

 

Does the new exhaust make that much of a difference? I love my TD27T over the TD27 and the crappy petrol and my fuel economy is lousy. I have been thinking about a motor and trans transplant from a VN to VR commodore but its kinda out of financial reach at the moment. The V6 motor isn't really that smooth but at least has a bit more poke. How noisey is the exhaust without a muffler??? I did that in my old land cruiser - sounded awesome hearing the turbo spooling up!!!

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wow this is an old post

 

to be some what helpful here goes:

 

better exhaust makes a big difference. on my td42 (same family as the td27) i changed my exhaust to a straight through 3" pipe and hand made 3" dump pipe from the turbo. very very noticeable difference. yes, noisy on hard acceleration but that great turbo whistle always makes up for it.

i find the 3" system on the troll is only a small amount louder than the standard system when cruising at 60kn/hr, which is most of the time here in oz. as stated above its really only loud when given a boot full

 

i would say a straight through exhaust around 2.5" possibly 2.75" (i dont recall the actual size of the stock exhaust on the td27), WITH a proper dump pipe would make a lot of difference to both 'go' and km's.

 

if your looking for more 'go', things you can do:

 

1. firstly just check what condition your air filter is in. having used a few different ones on my td42, i have found a fresh nissan air filter to always be better 'go' off the mark & more km's to the tank. i regularly go bush so theres no way a k&n will ever get near my car.

 

2. have ignition timing checked by a diesel specialist, our family of motor are know for having the injection timing redarded from factory, usually it can be advanced some what.

 

3. fit a holley red fuel pump near the tank. helps with power, km's and lower egt's

 

4. add an intercooler. air to air can be done on the cheap if your handy with a spanner. better yet air to water setups work very, very well.

 

5. have injectors rebuilt & burst pressures set a little higher - i have not done this YET, but everyone talks of it making a big difference to grunt & km's.

 

6. fit a manual boost controller. HOWEVER more boost means nothing without more fuel. so fitting a manual boost controller would mean raising the boost then taking it to a diesel specialist and have them adjust the fuel on the rollers.

upping the boost is a great mod to do & wont necessarily mean an increase in your average fuel consumption - depends on how often you use all that extra power.

 

now as for the commodore v6. been there done that, well still own it :D :D . wouldnt get rid of it for the world either :D :D :D

however since owning the diesel troll & seeing the amount of torque from idle, the amount of torque that the 3.8L produces is some what disappointing. yes it goes like a cut snake, but the ability to produce grunt verus flat out speed is very different. at the end of the day having the ability to use grunt rather then just hitting an 4wd obstacle fast is going to mean less breakage.

i think the cash you would end up spending on a 3.8L conversion would be better spent on the td27

 

hope all this is of some help

Edited by sw
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forgot to mention

 

have you ever checked you valve clearance

as with any motor incorrect clearance will give crap consumption & crap power

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forgot to mention

 

have you ever checked you valve clearance

as with any motor incorrect clearance will give crap consumption & crap power

 

Cheers SW - some good advice there! That's funny - the first thing I thought of when it came to ordinary fuel economy was getting it tuned by a pro and seeing if its running rich etc or not.... Since then I have been hunting around for someone to look at my timing - no joy so far... I see your in South Oz, but do you have any thoughts / recollections of reputable tuners in Melbourne at all?

 

To be honest, I just love the sound of the turbo and wouldn't like to see it go in place of the V6. I do also love the torque off the line from the diesel motors...

 

I think this weekend I will look into my exhaust and cut off the muffler and see what diff it makes in terms of noise, performance and economy. The misses will hate it but its my rig so she doesn't drive it!

 

My alternator died a week and a bit ago so this Sat will be ripping that out and replacing it with a newbie.

 

Thanks for your advice and waiting to here your feedback regarding the economy of the V6.

 

Just thought of another question, do you think anyone will have any drawings of the TD27T gearboxes (manual and auto) and the petrol gearboxes. Does anyone know what the part numbers are for the different boxes and whether the petrol 2WD boxes will bolt onto the TD27?

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I see your in South Oz, but do you have any thoughts / recollections of reputable tuners in Melbourne at all?

 

i dont know diesel people in melbourne, but i do know MTQ is australia wide & i know here in adelaide they are a very reputable place to deal with. we also have another mob by the name of hy-tech, who are very good, but i think they are an adelaide only company.

 

Just thought of another question, do you think anyone will have any drawings of the TD27T gearboxes (manual and auto) and the petrol gearboxes. Does anyone know what the part numbers are for the different boxes and whether the petrol 2WD boxes will bolt onto the TD27?

 

bolt pattern on the motor end should be no different for manual & auto.

dont know about the 2wd boxs but i do know a few things about the 4wd boxs. due to circumstances we fitted a z24(petrol) gearbox to a td27. we had to use the td27 belhousing, clutch fork mounting point/plate, clutch fork & throw out bearing but it did work.

i think td27 slave cylnder & pin aswell, tho it was a long time ago & i couldnt be 100%

 

one thing i will make mention of if your going to put a manual box in, do yourself a big favour - put new bearings & syncros in it. seen a few boxs with failed bearings after quite a few km's

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wow this is an old post

 

 

3. fit a holley red fuel pump near the tank. helps with power, km's and lower egt's

 

 

Quick question, what is the performance adder of putting the elec fuel pump? Is that to remove the need for the mech pump and the hp to spin it? I have been pondering this since you raised it and seems a little out of the box.

 

I have replaced the rear muffler with a piece of straight pipe and under the advice of another I am running some of that lovely biodiesel (from your side of the border) from SAFF. I have only driven around 90k's since adding it but the thick black smoke has already pretty much disappeared from the exhaust pipe under heavy acceleration and kick back of the auto.

 

Looking forward to your response - cheers!

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The TD27 is a great engine to improve performance.

Things that you can do.

The exaust has been said before.

The air filter, remove that filter and is box, i've put a Land Rover box and air filter with twice the size of the TD27 one.

Turbo, mine is just at 1 bar, i don't wan't more, because probably would brake faster.

The fuel pump, here's is the master mind, mine is just tweaked a little, 2mm of advance, a little more fuel, but a good fuel pump house, can modify the fuel pump, and tweak it, and the TD27, can reach 160hp with that.

Mine has only 134hp, but soon it will have a modified fuel pump, to reach about 150hp , its more than enough, and it will reach 6000rpm

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have a quick read here:

here

 

it only 2 pages & explains a few things

the comments i would be paying attention to are by 'old mav', 'tracteur tom' & 'its a ford not a nissan'

 

the last comment by old mav sums it up well

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The TD27 is a great engine to improve performance.

Things that you can do.

The exaust has been said before.

The air filter, remove that filter and is box, i've put a Land Rover box and air filter with twice the size of the TD27 one.

Turbo, mine is just at 1 bar, i don't wan't more, because probably would brake faster.

The fuel pump, here's is the master mind, mine is just tweaked a little, 2mm of advance, a little more fuel, but a good fuel pump house, can modify the fuel pump, and tweak it, and the TD27, can reach 160hp with that.

Mine has only 134hp, but soon it will have a modified fuel pump, to reach about 150hp , its more than enough, and it will reach 6000rpm

 

I looked at boosting mine - but the boost had already been wound up to around a max of 11 - 12 psi....

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have a quick read here:

here

 

it only 2 pages & explains a few things

the comments i would be paying attention to are by 'old mav', 'tracteur tom' & 'its a ford not a nissan'

 

the last comment by old mav sums it up well

 

 

Cool - I will print all of that out and have a good read! Cheers!

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  • 1 year later...

To try to keep things organized (and not 'lose' this post) I'm moving it to the diesel forum. Thanks for all the input guys!!

 

B

 

 

Can anyone tell me wat fuel pump would suit a td27t, is the holley red too big.

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  • 6 years later...

Hi everyone,

 

I'm travelling in the US and have a 1995 TD27 R3M back home in New Zealand. I would like to grab some parts to make some fuel efficiency improvements when I get back home. Air filter is one. I'm having trouble which air filter I need to get from the likes of K&N. Since the model I have is not sold here in the US. Any advice on other bits and pieces I could get while in the USA for a few weeks greatly appreciated!

 

Cheers

 

Vince

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  • 3 years later...

I know this is an old thread, but if anyone is still interested, the best thing you can do for a TD27t is make a new exhaust manifold. The stocker is horribly undersize/ restrictive. It will require a fair bit of mods to make it work, as you really have to move the turbo away from the engine a bit, requiring a new downpipe (and maybe oil/water pipes), which you can improve on heaps too if you make it from the turbo flange and get rid of the big cast bit, and figuring out the intake routing too, which isn't bad because with the turbo moved you can do away with the restrictive little 90 deg fitting on the turbo intake.

Doing this changed Mine heaps, it spools up earlier and much stronger, and pulls hard 'till the fuel can't keep up.

Edited by andrewt6447
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  • 2 weeks later...

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