2.7 TD Mechanical Tuning

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Soggydog

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Hi

My trusty 1995 Terrano is the only vehicle in my local farming community that handled the recent snow with ease (having good M+S tyres helped there!) but using it every day off the farm I really noticed the lack of oomph on tarmac. Nothing wrong with her, just that 100bhp/177lbft isn't a lot.... Does anyone know of any garage in the Kent/Sussex/Surrey area that could offer a mechanical tuning service (pump and injectors?) or that I could send a pump off to and get it sorted, and perhaps new injectors too?

Any advice appreciated!

Thanks
 
not sure how much boost these can handle, probably about 1 bar reliably. you can adjust the wastegate so it doesn't dump until 1 bar. also, charge cooling works great but the wastegate will need adjusting again as the pressure will drop accross the cooler. as far as tweaking fuel pump, i dont know the procedure for these pumps, but if a bosch ve type pump, i would guess it is same as 200/300 landy's tdi's and td25 navaras and even golf's with mechanical pumps. if you increase the fuel, exhaust temps go up, to reduce exhaust temps, turn up boost by adjusting the wastegate again. that IS how you get it done with bosh ve pumps but i am not sure how it is done correctly of my head. will find a link for tuning them and post it to let you decide how similar they are to your pump. i am new to nissan diesels, but to be honest, the technology for mechanical injection is much of a muchness and does not matter who's badge is on the bonnett.
richard
 
1 bar is too much for the stock TD27, both in terms of what the turbo can actually usefully give, and what the headgasket will handle given these have a 22:1 compression ratio.

Leave the wastegate where it is at, 8psi is enough to begin with. Wind up the pump alittle- it is simialr to the VE.

1/2 turn on the screw is plenty.

You really ought to be using a boost gauge, and EGT gauge before fiddling though.
 
i agree, egt and boost guage are great to tell the engine is running right after mods.
i did not know they won't handle 1 bar without mods to engine, did not mean to take you down the garden path on that. but if you don't have a charge cooler, get one.
http://cgi.ebay.com/ebaymotors/ws/e...0462845319&viewitem=&sspagename=STRK:MEWAX:IT
one of the most useful and reasonably priced multi guages i have found for ages. good too. obviously you need the sensors to go with it, but they are reasonably priced.
richard
 
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Thanks for the advice so far guys. It looks like the pump is where I should start, but I'm a clumsy fool with engines, so I need to find a "good" diesel engineer....!!
 
be brave soggy dog, you only need to take a look. if you feel it is beyond you after looking, fine. but get a good tuner, maybe even a mobile mechanic.
richard
 
Thanks Richard. If my reply were to contain the words "what side of the engine bay is the fuel pump in" would you have a rethink?
 
LOL, it is drivers side. you will need two torx bits, t25, t30, a 13mm socket and a paint marker and a flat blade screwdriver. if the engine is not able to keep 1 bar reliably without mods, then i would only turn the star wheel and the diaphragm 45 degrees so you keep the exhaust temp down. the smoke screw however, do as is suggested as this will make the truck more tractable when turbo is off boost and wont alter e.g.t much at all.
it really is easy, get a mate to do it for you if you are not that good at 'spannering'. just remember to mark the original positions so you can put it back to standard if you get stuck.
really, easy. you would be suprised how 20 mins makes it a totally different car to drive.
obviously the link is to a landrover not nissan, but the pumps all work the same way.
richard
 
Soggydog said:
Hi

My trusty 1995 Terrano is the only vehicle in my local farming community that handled the recent snow with ease (having good M+S tyres helped there!) but using it every day off the farm I really noticed the lack of oomph on tarmac. Nothing wrong with her, just that 100bhp/177lbft isn't a lot.... Does anyone know of any garage in the Kent/Sussex/Surrey area that could offer a mechanical tuning service (pump and injectors?) or that I could send a pump off to and get it sorted, and perhaps new injectors too?

Any advice appreciated!

Thanks
Click to expand...

Before you get busy with the tool kit I'm just going to throw in my two pence worth and ask are you sure there is nothing wrong with the terrano? Maybe the Terrano 2 that I have has a lot more bhp etc. than your terrano but I would consider oomph on tarmac to be reasonably good for the kind of vehicle they are. At least when all is working ok. It's probably true that the terrano's are no rockets and that I might not be comparing like with like but I wouldn't have thought the terranos were any slouch either.
 
danielj said:
Before you get busy with the tool kit I'm just going to throw in my two pence worth and ask are you sure there is nothing wrong with the terrano? Maybe the Terrano 2 that I have has a lot more bhp etc. than your terrano but I would consider oomph on tarmac to be reasonably good for the kind of vehicle they are. At least when all is working ok. It's probably true that the terrano's are no rockets and that I might not be comparing like with like but I wouldn't have thought the terranos were any slouch either.
Click to expand...

Dan the TD (non-intercooler version) only has 100bhp as the OP says, while the Tdi has about 125bhp and the 3.0 about 158bhp from memory....
 
lacroupade said:
Dan the TD (non-intercooler version) only has 100bhp as the OP says, while the Tdi has about 125bhp and the 3.0 about 158bhp from memory....
Click to expand...

I'm not comparing like with like so. The TDI does seem to have a good kick on the tarmac when running ok and the turbo gets going. When I had problems with the mass air flow gadgetry it definately lacked oomph though. It was the first diesel 4x4 I owned and I drove around for ages thinking that big hulking diesel motor's like the terrano probably couldn't be expected to have too much kick. Just thought there might be something wrong but if the TD model has somewhere around 25 bhp or so less I could see where a bit of tweaking might be desirable.
 
I to have a 95 2.7TD & it is so gutless on the road its unreal & a complete joke when you hit or slope or god forbid a hill :eek: :doh

But

Off Road...:sly :naughty :D :augie :thumbs :clap LOVE IT

Theres nout wrong with mine either i think its common with all the non-inter-cooled TD's :(
icon8.gif


I haven't tried or looked into it yet mainly down to time :eek: But, i think you can play with the fueling & turbo,wind the boost up & that sorts em out I'm led to believe :nenau

Also, wake an intercooler on it... Straight through exhaust... Smaller turbo for more grunt are all options but cost cash...

:thumbs
 
OK Gents, you've convinced me, and I'm going to attempt to tackle the pump. It looks like to get access I have to move a whole load of things out of the way, so not as easy as the Landrover Pump, and no cap covering the smoke screw, so I guess that's under the diaphragm cover. Here goes. Don't try and talk me out of it.... !
 
Access through the wheel arch, but still not that easy.

Turbo is plenty small enough as it is already!!
 
OK - took my life in my hands and did it! All you need is a 10m flat spanner and the hands of a 10 year old girl. Under the four bolts (with phillips screw tops) on the diaphragm cover, access is murder (I went at it from above) and only cut myself 17 times - 18 tops.

Rotate the diaphragm, and replace. I didn't bother with the star screw, as my manly paws couldn't get into the pump in situ, but a quick run out shows a marked difference for only a qtr turn of the rubber diaphragm. Couldn't see the "off boost" smoke screw anywhere, and if anyone can point out where it is I'd be over the moon, as there is now a pronounced step in off boost/boosted performance, that wasn't there before. I don't have an EGT gauge, but a qtr turn is fairly conservative.

Thanks to all, especially to Richard.
Soggy
 
1/4 turn would be safe enough, especially as you still dont see any smoke.

You wont see any off boost smoke, as this setting hasnt altered with just turning the diaphragm, just the onboost fuelling- also why you feel a pronounced step in power.

The 'smoke' screw raises / lowers fuelling right across the board on and off boost.

If you fancy going any more, an EGT gauge is essential to prevent meltdown, and I would suggest a spot more advance on the timing.
 
i will look on my old lump tomorrow, i would say that the adjustment may be on the underside of the plate as you need to put pressure on it to increase fuel. will get back to you. will take pics and do a good job as this is one for the archives i think.
richard
 
hello soggy, i have been really slack and not done as i said. i finished work late so never got to do it. i have no electric in my garage and it was dark when i got back home. will try this evening, i will get it done, but this whole week will be a busy one...
richard
 
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