LUVTruck.com

I've got an 82ish Diesel LUV and I'm wondering what fuel system upgrades I'd have to have in order to put a turbo on it? Does anyone know much about modding the FI pump?

Isuzu started putting a turbo version of the same motor into trucks and troopers in 1984 or so. A C223T from something like that would be a fairly easy swap. I don't know if it would be wise to graft the turbo onto a C223 motor though. I have heard that the earlier motors were known to have problems with the connecting rods being weak, and the later motors have somewhat thicker rods. The added stress of the turbo might be a little much for the bottom end of a non-turbo motor.

I'm not really worried about the turbo, or mechanical engine durability, but rather the fuel injection pump adjustments for boost. Mabye I just need someone who can point me to some serious knowledge about diesel injection pump modds.

I could be wrong but I have been looking for quite some time for mods to my 81 diesel 4x4 luv and havent found too much.....specificaly i was looking for a turbo or mods to injection pumps the turbo stuff i found but not much at all for the injection pumps if but im still looking so maybe i will get lucky....

The turbo sent the rpm ovr the redline very quickly, the early ones w/ the turbo had a govener on them to keep it from happening and slingging rods, but the turbo gave the engine too-much momentum and it went over the redline and slung the rods, but yeah, i'd switch out the rods if i could, to be on teh safe side.

And i beleive there is a way to turn up the injectors, something about the screw on the top of them... but i'd make the truck run hotter

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-Old ride-82 Luv diesel 5spd with some upgrades
-Past rides-82 Sierra, 78 Coupe De'Ville, 91 2dr Blazer, 86 RX7, 86 Porsche 944T (rear-ended and totaled)
-Curr. rides- 1970 Ford LTD 4dr, 390 4Bbl, 2nd owner! With a few Extras 00' Civic beater...

Shouldn't this be in the "Diesel" section?

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Resident lurker

Yeah there is adjusters in the injectors but dont have a injector pressure tester to know actually....

There is a set screw at the back of the pump near the top, with a locknut to keep it in place. Turning this in will increase fuel. 1/2 turn make a big difference. There is no compensator for manifold pressure on a n/a injection pump, so this will just pump more fuel regardless of manifold pressure. A turbo pump gives more fuel when there is boost pressure present, but not just a usual amount without boost.

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Bona Fide diesel fanatic.
1994 Chev S10 Ext Cab Isuzu Diesel 5spd
Kubota B6100 HST diesel

So, has anyone figured out a way to make a NA pump boost sensitive?

I havent...

You would need to take the controller off the turbo pump, but if you had the pump it would be easier just to switch pumps of course. No other way that I know of.

It won't smoke a lot off boost if you keep your foot off the floor, unless you set it up to run so much fuel it blows smoke under boost also. This too will kill the decent fuel economy these little engines get.

There are issues of boosting an engine not designed for boost. The turbo C223 has bigger rod bearings, along with different pistons and rings to take the heat. I think the exhaust valves are also different. Heat is a big issue with turbocharging. Exhaust pipe also should be bigger for better breathing. Timing must be correct (for the IP). The aformentioned weak rods is again something. I talked with a guy who turbo'ed his n/a C223 and has run it over 50,000 miles with no problems, mainly because he doesn't let it over-rev.
He also made an engine brake that he says is very effective. I plan on building one for myself, as I live in hilly country.

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Bona Fide diesel fanatic.
1994 Chev S10 Ext Cab Isuzu Diesel 5spd
Kubota B6100 HST diesel

Yes, Zack and I discussed my n/a C223 diesel over on the 4x4 forum and off.

Like Zack sez one should be careful to not rev these buggers too high as that seems to be the rod breaker. I seldom rev mine over 3000 rpm. Still, I don't need to, because the increased torque with lots of short shifting allows very good performance. 3000 rpm gives me about 80 mph in 5th gear with a 3.42 rear end ratio.

Paul

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'84 Isuzu diesel P'up

I sure like your engine bay. Clean, rust free....wish mine looked like that.

That 3.42 gear ratio work well for you? I have 3.73 and it is a bit too high (low?), though I don't have a turbo. I feel maybe 3.90 gears would suit me better. I also live in hilly terrain, certainly not mountainous.
It revs about 1900rpm at 50mph, too low for hills, especially when pulling a trailer, and 4th is about 2700 rpm. The gears are too far apart. 1st is a little tall when pulling away on a hill with a heavy load also.

Sorry to babble on. I'll stop now.

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Bona Fide diesel fanatic.
1994 Chev S10 Ext Cab Isuzu Diesel 5spd
Kubota B6100 HST diesel

Zack & All--

Well, the 3.42 ratio is terrific on the highway and we have lots of them. It is less good on steep grades and when towing.

In my dreams I would have this gear ratio and a gear splitting transmission so that I would have the 'perfect gear' for any occasion.

Or, I could just install a high torque V8 and leave it in top gear all the time .

But, until my dream comes true or I go mad with a V8 I think I would just compromise by sticking with the stock 3.73 gears. I have driven the truck both ways and either is pretty good for my use. One needs to keep the revs under control no matter which gears one has.

Zack, are you sure you have a 3.73, as my calculation indicates that one would have about 2400 rpm in 4th at 50 mph with a 3.73 rear end and 195x14 tires. And you have indicated 2700 rpm. Maybe you already have a 3.90? What is your tire size? I am assuming that 4th is straight thru in your box.

And yes, your rpm change from 4th to 5th calculates out to a 30% change, a large change for a small engine. The Isuzu trannys change only 14 % between 4th & 5th.

I am embedding a chart I made up to show the relationship between engine speed, gear ratio and road speed. This chart is made up for 3.42 gears and 195x14 tires. It also shows the difference btween a diesel transmission and a gas transmission. I am thinking of using a gear set from a gasser in a diesel case to get the closer ratios. I think later model gas trannys had still closer ratios.



Paul

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'84 Isuzu diesel P'up

TurboPaul, could you tell me more about the "altitude compensator"??

Hey Ashley--

Send me an email.

Paul

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'84 Isuzu diesel P'up