200tdi or 3.9 Isuzu......

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Originally Posted by Dougal

Is that old Isuzu non-turbo? If so there's a very obvious upgrade that'll make the 300tdi feel like a slug.:)

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well if your implying that the upgrade that should be made is a turbo we already considered that but since the engine has just under 400,000k's we were advised not to turbo without reconditioning the whole engine first then installing the turbo there is also 2 other options we came up with 1: upgrading the injector pump to a bigger sized one or getting a old injector pump of the early isuzu's that came out with the larger pump and 2nd idea was : trying to find a 4bd1T in really good condition and slapping it in but the downfall is firstly never seen or tried a 4bd1T and the second thing is that the santana gearbox in the isuzu is badly matched to the 4bd1 because they just dont hav enough power to utilise all gears properly wat do u sugest ?

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Originally Posted by c.h.i.e.f

well if your implying that the upgrade that should be made is a turbo we already considered that but since the engine has just under 400,000k's we were advised not to turbo without reconditioning the whole engine first then installing the turbo there is also 2 other options we came up with 1: upgrading the injector pump to a bigger sized one or getting a old injector pump of the early isuzu's that came out with the larger pump and 2nd idea was : trying to find a 4bd1T in really good condition and slapping it in but the downfall is firstly never seen or tried a 4bd1T and the second thing is that the santana gearbox in the isuzu is badly matched to the 4bd1 because they just dont hav enough power to utilise all gears properly wat do u sugest ?

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Sounds like a recon could be the first upgrade then.:)
The stock injector pumps (they all seem to use Bosch/kiki/zexel type A pumps, but the governors vary) have heaps of unused capability, but turning up the fuel will do nothing but make smoke unless you've got a turbo to throw extra air in at the same time.

If the compression is good, I'd turbo it regardless of the km travelled. If the compression isn't good, then rebuild it and turbo it at the same time.

I've got a santana matched to a 4BD1 (with 'T' added by a previous owner) - it goes fine and has plenty of power, so I'm not sure what you mean by the badly matched comment. I do intend to intercool it someday, but that can wait for now as I rarely get to drive the blardy thing.

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Originally Posted by c.h.i.e.f

well if your implying that the upgrade that should be made is a turbo we already considered that but since the engine has just under 400,000k's we were advised not to turbo without reconditioning the whole engine first then installing the turbo there is also 2 other options we came up with 1: upgrading the injector pump to a bigger sized one or getting a old injector pump of the early isuzu's that came out with the larger pump and 2nd idea was : trying to find a 4bd1T in really good condition and slapping it in but the downfall is firstly never seen or tried a 4bd1T and the second thing is that the santana gearbox in the isuzu is badly matched to the 4bd1 because they just dont hav enough power to utilise all gears properly wat do u sugest ?

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??? As Dougal said, if it has good compression, turbo it.

I agree with Echidna - the LT85 (santana) box is well matched to the 4BD1. You need to be doing 100km/h or higher to use 5th, but apart from that... A turbo will only help.

My 4BD1 has 340 000 km on it and still runs like new, and uses no oil. I have no qualms about turboing it.

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Originally Posted by isuzurover

??? As Dougal said, if it has good compression, turbo it.

I agree with Echidna - the LT85 (santana) box is well matched to the 4BD1. You need to be doing 100km/h or higher to use 5th, but apart from that... A turbo will only help.

My 4BD1 has 340 000 km on it and still runs like new, and uses no oil. I have no qualms about turboing it.

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as all i mean by badly matched is 1st gear seems to be to high for the engine and yes i would agree that if it has a turbo it would improve things much more but just to be safe i would probably recondition the engine completely and then put a garrett turbo on it (does anyone know wat size/model would match ?) but if not i would probably look for getting a 4bd1T if anyone has an other solutions to get more power out of the isuzu without affecting the long geverty of the engine it would be much appreciated

cheers

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Originally Posted by c.h.i.e.f

just to be safe i would probably recondition the engine completely and then put a garrett turbo on it (does anyone know wat size/model would match ?)

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Why yes.:)
There are a range of turbos that'll work depending on what you want.
I run a T25 with a 0.49 A/R turbine which is as small as you want to go. Heaps of boost, like 16psi from 1400rpm, I run 20psi.:angel:

As you go bigger these are your other options in increasing size.
T25 with a 0.64 A/R turbine
T28 with a 0.64 A/R turbine
T28 with a 0.86 A/R turbine. Isuzurover (Ben) is fitting one of these right now.

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Originally Posted by Dougal

Why yes.:)
There are a range of turbos that'll work depending on what you want.
I run a T25 with a 0.49 A/R turbine which is as small as you want to go. Heaps of boost, like 16psi from 1400rpm, I run 20psi.:angel:

As you go bigger these are your other options in increasing size.
T25 with a 0.64 A/R turbine
T28 with a 0.64 A/R turbine
T28 with a 0.86 A/R turbine. Isuzurover (Ben) is fitting one of these right now.

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oh ok thanks for the info keep me informed on how the person installing this turbo goes . i would liek to try and match a turbo that deosnt kick in until u start to give it some stick so it can still lug around town like normal but wen u need to pull up hills and over take someone etc etc the turbo can kick in to give it some more bang if thats how i should put it!

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Originally Posted by c.h.i.e.f

as all i mean by badly matched is 1st gear seems to be to high for the engine and yes i would agree that if it has a turbo it would improve things much more but just to be safe i would probably recondition the engine completely and then put a garrett turbo on it (does anyone know wat size/model would match ?) but if not i would probably look for getting a 4bd1T if anyone has an other solutions to get more power out of the isuzu without affecting the long geverty of the engine it would be much appreciated

cheers

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1st gear is low enough for me, and I have 33's. You could swap the t-case high range gears to 1.22:1 if you want it lower though.

Dougal posted on turbos.

The 4BD1 and the 4BD1T are 99% the same - disregard whoever posted something earlier about not turboing a 4BD1. Plenty have and many run higher than stock boost without problems.

i herd that there is one difference with a stock 4bd1T and just getting a 4bd1 turboed i herd that the stock 4bd1T has a different crank and different pistons ?

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Originally Posted by c.h.i.e.f

i herd that there is one difference with a stock 4bd1T and just getting a 4bd1 turboed i herd that the stock 4bd1T has a different crank and different pistons ?

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The only important differences between a 4BD1 and 4BD1T are that the turbo model has:
Tufftrided/nitrided crank
"Alfin" pistons - but so do late model 4BD1s
Oil spray to bottom of pistons

Everything else is the same, including compression ratio, etc...

We are talking a 2 Tonne LR here, not an 8 Tonne truck. It isn't like the engine is having a hard life - even when you are like Dougal and thrash it.