Will a Turbo get my LD28 up the hills?

Discuss (and cuss) the Nissan LD-series OHC Six diesel engine, popularly available in the US in 1981-83 Datsun/Nissan Maxima Sedans & Wagons.

Moderators:plenzen, goglio704, glenlloyd, Nissan_Ranger

Post Reply
User avatar
hamahona
Posts:20
Joined:10 years ago
Location:Auckland, New Zealand
Contact:
Will a Turbo get my LD28 up the hills?

#1

Post by hamahona » 9 years ago

I have a Jaguar which had a LD28T when I first bought it. It was gutless as a snail. I put it down to a stuffed diesel pump. Instead I put in another LD28 without a turbo. The car went smoother and queiter.

I am wishing to put the turbo on to the new engine, with a new turbo of course. I will buy this one http://www.trademe.co.nz/motors/car-par ... 852282.htm.

This is my concern. The country I live in (New Zealand) is very hilly. When my Jag goes up the hills it struggles. I get passed by fill buses and loaded truck and trailers. I was going up the Bomb Bay Hills and I was passed by a Isuzu Bighorn 3.2 Diesel Turbo doing 120kph, I could only get the Jag up at 78kph, and that was at full throttle. This is the same speed my Jag done with the previous turbo LD28T engine. When the car is on the flat it drives very well, but come to a hill and it kills it. I have retarded the timing and advanced it, and obviously it goes a bit better when advanced, but knocks real loud. I have also changed the injectors with no notice in performance and also screwed the fuel screw out and it just makes it smoke more.

What my question is, if I invest in this turbo conversion is it going to get my cars up those hills better?

Thanks in advance
1983 Jaguar XJ6 LD28 3 speed Overdrive
1992 BMW 750il V12 Auto

"You cant have a diesel in a Jag" :p

User avatar
240ZD
Posts:103
Joined:13 years ago
Location:Longview, WA

#2

Post by 240ZD » 9 years ago

There was something wrong with your old turbo engine!

If you turbocharge your car it should absolutely get up the hills. I turbo'd mine and it flies past everything on steep inclines.
"Man, your engine is knocking really bad..."~

User avatar
hamahona
Posts:20
Joined:10 years ago
Location:Auckland, New Zealand
Contact:

#3

Post by hamahona » 9 years ago

Cheers for that advise, I will definitely turbocharge it, would be nice to get up some hills without having to hold my breath.
1983 Jaguar XJ6 LD28 3 speed Overdrive
1992 BMW 750il V12 Auto

"You cant have a diesel in a Jag" :p

Carimbo
Posts:460
Joined:15 years ago

Re: Will a Turbo get my LD28 up the hills?

#4

Post by Carimbo » 9 years ago

hamahona wrote:...and also screwed the fuel screw out and it just makes it smoke more.
Try turning the fuel screw IN for more fuel.

Also: What is your air intake like? (Tubing length/diameter, filter type, etc.)
Exhaust? Gearing?

Finally: What is the weight of the Jag? Maxima LD28 gives acceptable performance (except at altitude) but weighs under 3000 lb.

User avatar
hamahona
Posts:20
Joined:10 years ago
Location:Auckland, New Zealand
Contact:

#5

Post by hamahona » 9 years ago

Woops, I meant I screwed the fuel screw in.

Im using the factory Jaguar aircleaner, the plastic pipe to the aircleaner is about 1 meter. I tried taking it up hills with the aircleaner removed from the intake manifold and it still sluggy.

Exhaust is factory Jaguar, which is one pipe that goes into 4 mufflers, split 2 per side.


Final drive is 3.07

The Jag weighs 4,065lb
1983 Jaguar XJ6 LD28 3 speed Overdrive
1992 BMW 750il V12 Auto

"You cant have a diesel in a Jag" :p

haightc
Posts:4
Joined:9 years ago

#6

Post by haightc » 9 years ago

I would venture your tranny has a lot to do with it. That being it probably hard for most us drivers to be able to visual it. Taking a ford lazer from christchurch to akora harbor was pushing it, we often had to pull over to keep the brake from lighting on fire. My 1n-t tercel makes it up the hills no problem, my c233 pick up stuggles as soon as I hit any incline. So based on that I think a turbo will help but not probablyy enough to overcome the 3 speed.

User avatar
kossak
Posts:58
Joined:12 years ago
Location:Romania, Europe

#7

Post by kossak » 9 years ago

I have the same 'frustration' when going uphill with my C32 Laurel.
1.4 ton car, 80 hp, tall gears....It struggles keeping 80kph uphill@3000 rpm.
If let the trans lockup @ around 2500 rpm it smokes like a train :)
At 3000 rpm there's almost no smoke but no acceleration as well.

No wonder the Jag is a slug, being heavier than the Laurel/Maxima.
To be honest, overtaking is quite a challenge with my car. 0-100kph in 20 seconds is not fun in certain circumstances :D
'86 Nissan Laurel LD28 AT

User avatar
hamahona
Posts:20
Joined:10 years ago
Location:Auckland, New Zealand
Contact:

#8

Post by hamahona » 8 years ago

Ok I stuck this turbo on it. http://scarles.co.nz/index.php?main_pag ... cts_id=148

I choose this one as it had a internal wastegate, the only catch is you had to drill a hole for the wastegate and fit it. I would of got a turbo more suitable for low rev diesel but this was the only one that had a wastegate option.

I fitted it and the wastegate would not fit due to positioning of the outlet pipe so I badly modified it with a exhaust clamp. This resulted in only a 3 pound boost.

The results were terrible. The car did not get up the hills better, maybe an increase of 2kph. So what I am guessing is the wastegate is not working.

I have been reading that diesels dont really need wastegates. So I am going to have the hole I made for the wastegate welded up and see how it performs then.

Im going to be selling the car, its way too slow on hills but cheap to run. 10km to a litre
1983 Jaguar XJ6 LD28 3 speed Overdrive
1992 BMW 750il V12 Auto

"You cant have a diesel in a Jag" :p

User avatar
exmod110
Posts:34
Joined:14 years ago
Location:Manitoba

#9

Post by exmod110 » 8 years ago

Did you adjust the fuel? just adding air will not get you more power, you need air and fuel.
If you think the waist gate is not working get a boost gauge to confirm what you have for boost if any.
85 Landrover 110 300tdi
02 Mazda protege5

User avatar
hamahona
Posts:20
Joined:10 years ago
Location:Auckland, New Zealand
Contact:

#10

Post by hamahona » 8 years ago

I put a boost gauge on it and it gets 3psi top, averages 1psi thou. I did adjust the fuel and it made no difference, I think due to the low boost. Will see how it goes when I have the wastegate removed and wastegate hole welded up.
1983 Jaguar XJ6 LD28 3 speed Overdrive
1992 BMW 750il V12 Auto

"You cant have a diesel in a Jag" :p

User avatar
exmod110
Posts:34
Joined:14 years ago
Location:Manitoba

#11

Post by exmod110 » 8 years ago

Unless you have another turbo sitting around, dont weld it!
can you post a pic of the set up you have with clear pics of the turbo and waste gate?
if you have turned up the fuel and are only getting 3 pis of boost it must have lots of black smoke?
85 Landrover 110 300tdi
02 Mazda protege5

User avatar
240ZD
Posts:103
Joined:13 years ago
Location:Longview, WA

#12

Post by 240ZD » 8 years ago

After I got my RaJay turbo broken in, my LD would hit 12-14 psi without even touching the smoke screw, if I was really on it. Hitting 8-9 psi is easy.

Something must certainly be wrong with your turbo setup, because I can steadily and quickly accelerate ever faster even up a long hill, even through 5th gear in many cases. It doesn't seem like the heavy vehicle weight or automatic tranny would stop a turbocharged LD from pushing your car up a hill.

My setup has no wastegate at all, just a 2.5" downpipe and straight exhaust.
"Man, your engine is knocking really bad..."~

User avatar
hamahona
Posts:20
Joined:10 years ago
Location:Auckland, New Zealand
Contact:

#13

Post by hamahona » 8 years ago

Thats good to hear another LD28 not using a wastegate.

The pipe that goes from the turbo to the Inlet manifold was split open. So maybe thats one reason why Im having problems along with the bad wastegate.

I have removed the wastegate and blocked the hole but have the engine out at the moment, had a dose of badly dirty oil which blocked the pickup sump.

When I bought the turbo I bought one with a wastegate. This turbo give best power at high revs so maybe this could be why its still slow.


When I get it running well I will write here the results.
1983 Jaguar XJ6 LD28 3 speed Overdrive
1992 BMW 750il V12 Auto

"You cant have a diesel in a Jag" :p

User avatar
dieseldorf
Posts:190
Joined:13 years ago
Location:Oracle, AZ

#14

Post by dieseldorf » 8 years ago

My Astro weighs 4000 LBS and behaves similar. I have a 5-speed (gasser) manual tranny and switch to 4th on uphills. As long as the engine revs above 2700 it pulls. A true diesel tranny has better gear ratios but hard to find. I changed ring/pinion to 3.73. Much better, but 3.90 would be optimal
What you can do:
smaller tires (low profile 60), smaller rims from chevy, change ring/pinion.
Astro Van with LD28 propulsion
'84 Mercedes 190D 2.2L 5-Speed Manual purchased 06/12 SOLD 06/13
'86 Ford Escort Wagon Diesel MT Sold 07-17-08

omegatotal
Posts:2
Joined:8 years ago

#15

Post by omegatotal » 8 years ago

wondering what happened with this?

Post Reply

Who is online

Users browsing this forum: No registered users and 5 guests