HDJ80 DIY performance mods

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Has anyone on this list got experience of the DIY pump adjustments for a
12v ? Not sure how different the 24v is for these mods.
Any other DIY performance tips anyone would like to pass on?
I'm saving my pennies for an intercooler but thought I'd have a tinker
while I'm waiting ...
Thanks,
Jon.
 
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I can't remember exactly, but I believe it entails removing a washer from a
spring in the pump that provides a pre-load and makes it run 'lean'.
Collyweston Garage in Grantham know the mod. They're on +44 (01780) 444271.
Isn't there also something similar to be done to the wastegate to give more
boost without blowing it up?
Neill Watson
-----Original Message-----
From: [Email address removed]
[mailto:[Email address removed]]On Behalf Of Jon Wildsmith
Sent: 17 August 2004 21:21
To: [Email address removed]
Subject: [ELCO] HDJ80 DIY performance mods
Has anyone on this list got experience of the DIY pump adjustments for a
12v ? Not sure how different the 24v is for these mods.
Any other DIY performance tips anyone would like to pass on?
I'm saving my pennies for an intercooler but thought I'd have a tinker
while I'm waiting ...
Thanks,
Jon.
 
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Sounds very interesting, I'll try giving them a call.
Thanks,
Jon.
-----Original Message-----
From: [Email address removed] [mailto:[Email address removed]]
On Behalf Of Neill Watson
Sent: 17 August 2004 21:37
To: [Email address removed]
Subject: RE: [ELCO] HDJ80 DIY performance mods
I can't remember exactly, but I believe it entails removing a washer
from a
spring in the pump that provides a pre-load and makes it run 'lean'.
Collyweston Garage in Grantham know the mod. They're on +44 (01780)
444271.
Isn't there also something similar to be done to the wastegate to give
more
boost without blowing it up?
Neill Watson
-----Original Message-----
From: [Email address removed]
[mailto:[Email address removed]]On Behalf Of Jon Wildsmith
Sent: 17 August 2004 21:21
To: [Email address removed]
Subject: [ELCO] HDJ80 DIY performance mods
Has anyone on this list got experience of the DIY pump adjustments for a
12v ? Not sure how different the 24v is for these mods.
Any other DIY performance tips anyone would like to pass on?
I'm saving my pennies for an intercooler but thought I'd have a tinker
while I'm waiting ...
Thanks,
Jon.
 
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Guest

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Have a good read of -
http://www.lcool.org/technical/80_series/1hdft_pump_adj.html
I carried out these mods a couple of months ago. I followed the order
laid out in the article. I found that the most significant factor in
alteration of performance was definitely the boost compensator
profile,ie the "load" you put on the diaphragm.
I have to confess that I made a mistake when doing the mods - after
removing the four allen screws from the top of the compensator housing I
eased it upwards, at this point I should have stopped, and I removed it
from the pump. I heard a metallic click and thought - oh fffffffffff
!!!!!!!!!!! However, every cloud has a silver lining as it enabled me to
see how the boost compensator pin is profiled and thus enabled me to
orientate it for the optimum setting. In my case - '97 24 valve model -
with TPS , the pin has an offset profile ground approx half way along
its length. Rotating the pin moves the position of the profile with
respect to the spring and it is this which affects the pre load and
hence the tension discussed in the article. In my case I moved mine a
quarter turn. With the cover, diaphragm and pin removed you can see the
toothed wheel and detent spring, I turned the pin by three clicks.
With regard to the off boost adjustment I had an advantage with the pin
etc removed as I could see that the range of adjustment was in fact over
a range of half a turn. What affects this is a wedge like profile that
the adjustment screw ( the one with the yellow paint ) abuts on. The
more the screw goes in the further the pin goes in the more the fuel
etc. Now if you look at the upper surface of the wedge you will see a
witness mark where the screw contacts it. Back off the screw and rotate
the pin so the wedge presents its highest point to contact the screw.
Now you wind the screw in and road test so that you are happy , I found
that I could wind in the screw in steps of half a turn then road test
each time.
Leave plenty of time to do the mods , do one at a time, and road /
smoke test after each adjustment. Follow the steps in the article, dont
despair if the pin comes out - with a bit wiggling it went back in again
!! I had also thought about the "washer" mod to add further pre load -
thats next along with,
fitting my Walbro pump and gauges .
If you want a very cheap mod that allows the turbo to spool up faster -
remove the central silencer and replace with a plain pipe. It won't be
any noisier, and the reduced backpressure allows the engine to rev
better- trust me, I've done it. Next step 3 inch exhaust.
Sorry about the length of post !!
Regards Gareth Jones '97 1-HDFT S.Wales.
 
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With the cover, diaphragm and pin removed you can see the
toothed wheel and detent spring, I turned the pin by three clicks.
Apologies, I of course turned the wheel with respect to the pin by
three clicks.
Sorry everyone.
Gareth.
 
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Hi Jon,
Let us know how you get on with that.
In the meantime, here is some info that might be of interest:
From [Email address removed] on the 80s list:
Have you decided which intercooler kit to go for?
--
Regards,
Julian Voelcker
Mobile: 07971 540362
Cirencester, United Kingdom
80less at the moment
 
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Spoken to someone at Collyweston Garage, very friendly (thanks a lot for
that tip Neill). They do a pump tune (the mods we know about I'd guess)
and raise the turbo boost to approx 11 psi (said standard is around
6psi). 1 hour for turbo, couple of hours for pump, =A355 per hour I think
he said so quite cheap.
It's booked in for this coming Monday morning so we'll see ...
I was leaning towards Jeremy Fearn because I've heard lots of positive
words about his work and not much about the other options but he's not
cheap @ =A3850 plus wants the car for a week, not sure if he would have
done the turbo tweak for that.
I had my exhaust replaced with a Powerflow system yesterday and low rev
power has improved, this was in preparation for intercooler etc mods.
It's as quiet as the original system (I had already removed the back
box) so I may go back and get them to remove the front box as well.
With the pump & turbo mods done on Monday I may be in less of a hurry to
get the intercooler, I'm only trying to compensate for extra weight, a
snorkel and 35's not win the traffic light drag race. I'm also a bit
concerned that with an intercooler and an aircon element (can't remember
it's proper name) in front of the main radiator it will cause cooling
problems but then again an intercooler is supposed to reduce
temperatures?
Thanks to all who replied and I'll let you know how it goes with
Collyweston on Monday, hopefully I'll have a big grin on my face.
Cheers,
Jon.
 
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I think so, but I don't know if it was a separate company or just
another trading name.
Yes he has and I know he's got a lot of good press for his LR mods. Have
not seen an installation to know what sort of quality it is though.
Thinking about it a little more this morning, assuming I'm happy with
the turbo and pump mod Collyweston perform I may look for a cheaper,
possibly part DIY intercooler solution to save money.
It was a complete system replacement in 2.5" stainless steel (too many
bends for them to do 3"). It's in similar sized sections to the original
so I'll ask them to make up and fit another front pipe without silencer
and see how noisy it is. I can always have the current pipe put back on
if I don't like it. Cost was =A3280 but should be more than that as it was
a friend of a friend kind of deal.
Best Regards,
Jon.
 
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Hi Jon,
Weren't they Four Counties?
Yes, it would be interesting to see what they actually do.
Do you know if he has done one for an LC before? I get the impression
that the likes of Jeremy Fearn and Andy Graham are basically building the
coolers (you can buy the core and then weld on your own end bits) and
then sorting out the plumbing.
Which sections were replaced and what were the costs?
--
Regards,
Julian Voelcker
Mobile: 07971 540362
Cirencester, United Kingdom
80less at the moment
 
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Hi Jon,
That is what I am planning on doing.
Do they also replace the flexible section coming off the turbo?
I see from their site that they only do upto 2.5". Did you go right to
the back or have it coming out of the side by the rear wheel?
--
Regards,
Julian Voelcker
Mobile: 07971 540362
Cirencester, United Kingdom
80less at the moment
 
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Hi,
No, they don't have an equivalent so I asked them to retain the original
flexi, they cut the down pipe and put a flange just after the flexi.
That part of the original exhaust looks to be 2.5" anyway.
to
I cut the back box off and welded a bend to bring my exhaust out the
side behind the wheel ages ago. The exhaust place just replicated what I
already had. Having it sticking out the back in standard position is bad
news in some situations if you're off roading.
They can do 3" if it's not got too complicated a shape - they have to
buy the bends pre made, they can only bend up to 2.5" in situ. I don't
know how much difference 3" would make but I figured a new 2.5" free
flow is better than the old standard system. I needed a new exhaust
anyway and =A3280 was cheaper than I could buy a standard system and I'd
have to modify the back of it anyway. I think for my power needs this
new system will be fine.
Cheers,
Jon.
 
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Sorry folks, was away laning for last couple of days after the mod. Very
pleased with the change, much better pull especially low to mid revs,
overtaking much easier now although just normal driving is all round
more pleasant.
Not sure what sort of setup I was expecting but Collyweston garage is a
Toyota dealership so you get to sit in reception and drink coffee but
not see the work being done though washers were mentioned with respect
to the turbo. Turbo boost was raised from 6 to 9 psi though they say you
can go as high as 11 without getting silly I decided to play safe. The
fuelling was very low which I'd suspected through never giving puffs of
black smoke so they turned that up a bit as well.
Total cost was =A3128 which is a very cheap performance upgrade in my
opinion.
Too early to be sure of effect on MPG as it's had mixed on/off tarmac
miles since but if anything I'd say economy is improved.
IMHO if you have a HDJ80 you should get this done.
Best Regards,
Jon.
 
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Glad it worked out for you, Jon.
I've known Collyweston for years, they're good guys, not your average
'clone' main dealer - in fact I thought they'd wrapped the franchise in. The
owner has run a variety of competition cars and they run a HiLux with a
Lexus V8 in rally raid events in France, I believe.
Though I've known them a long time and done business on the 'phone, I've
never actually been there!
Regards
Neill Watson
Thinking about a Lexus V8 in the FJ62....
 
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Hi Jon,
How did you get on with this?
--
Regards,
Julian Voelcker
Mobile: 07971 540362
Cirencester, United Kingdom
80less at the moment
 
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I think it was the franchise that stopped the Four Counties side of the
operation - apparently Toyota don't like them being associated with 3rd
party components or something like that.
Jon.
 
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Hi Jon,
Out of interest, do you know how they did this?
Normally you can adjust the wastegate actuator, but its not adjustable
on the 80.
Also, how are you getting on with the fuel consumption - any
improvements?
--
Regards,
Julian Voelcker
Mobile: 07971 540362
Cirencester, United Kingdom
1994 HDJ80, 2.5" OME Lift, ARB
 
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-----Original Message-----
From: Julian Voelcker
Sent: 16 September 2004 01:01
I happened to be under the front of it the other day and a bit of clean
metal caught my eye. Looks like the waste gate actuator has been held
away from the body of the turbo with a couple of washers between it and
it's mounting.
Can't tell yet, it's either been school run or lane driving since having
it done so I've not bothered keeping an eye on it. The gauge seems to be
going down at about the same rate so it hasn't changed a lot either way.
Best Regards,
Jon.
 
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Hi Jon,
Ah, I like the Heath Robinson approach, what is it, one washer per PSI :)
Well as long as you are getting better than the 17mpg average I have at
the moment :-((
--
Regards,
Julian Voelcker
Mobile: 07971 540362
Cirencester, United Kingdom
1994 HDJ80, 2.5" OME Lift, ARB
 
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[CHAT] ... to lighten a grey & wet friday (no LC content at all!)

Ladies & gentlemen
I was sent this today, and I suppose there is a tenuous automotive content since it came from someone working at Volvo.
I've posted it here http://www.christopherbell.freeola.com since I'm not sure whether this list server will handle attachments.
Christopher Bell
 
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