INJECTOR UPGRADE

[BIG C]

I will be replacing the injectors in my late 91 inter cooled 5.9 ctd powered w250.
Three of the injectors appear to have been replaced or rebuilt.
What or how big of injectors can be put into a truck that has not had head work, or a bigger turbo put on?
The truck does have a 4" straight exhaust, I believe the pump has been 'turned up' a little it has gauges, and a large air filter(stock?)
and stock intake.
thanks for your reply..

[BC847]

I will be replacing the injectors in my late 91 inter cooled 5.9 ctd powered w250.
Three of the injectors appear to have been replaced or rebuilt.
What or how big of injectors can be put into a truck that has not had head work, or a bigger turbo put on?
The truck does have a 4" straight exhaust, I believe the pump has been 'turned up' a little it has gauges, and a large air filter(stock?)
and stock intake.
thanks for your reply..

If you promise not to do anything else, some PDR (Bosch) 190's would serve you well.

But going back to that "If". What do you plan to do down the road? Work the truck? Play truck?

That precipice in front of you is quite slick from those before you. Be careful. The CTD is one tough monkey to get off your back.

[BIG C]

I should have mentioned that the truck will mostly be used for work and some play. it will be called upon to haul 1,000 - 7,000 regularly and during wood cutting'season' it will get to pull more than 12-14,000 lbs.
I don't need to go 100 mph, I just want to pull 10-12,000 through the colorado mountains at 75 80 mph and do it with authority.
I'm dreaming sort of...........
Also some more bottom end wouldn't hurt this truck either, it's an auto.

[CumminsPride]

I would say bosch 190's or just a 30-40HP injector of your choice. With a carefully tuned pump you could get by with some 370's just watch your guages. A valet would also be a good choice with bigger sticks. A Stage IV compressor would help with the EGT's too. Oh, CONVERTER, CONVERTER, CONVERTER will help with your authority!!

Wade

[flashgordon]

I would say bosch 190's or just a 30-40HP injector of your choice. With a carefully tuned pump you could get by with some 370's just watch your guages. A valet would also be a good choice with bigger sticks. A Stage IV compressor would help with the EGT's too. Oh, CONVERTER, CONVERTER, CONVERTER will help with your authority!!

Wade

A work horse auto......HUmmmm, I would start with CONVERTER, VALVE BODY or a SHIFT KIT for it .............Tranny COOLER most definitely.
You will gain HP and mileage with these mods. then go for the 190's or even the 370's.

I now this is a lot of cash to throw at it first off but, the week link is the tranny, fix it first and there will be more trouble free miles in you future.

Flash

[PToombs]

There is a big difference between 190's and 370's. For a work/ play truck, with no air upgrades, turbo etc, 190's are good. They are smaller than stock, with more holes so they atomize better. Better fuel mileage and more power than stock. I have 370's, no way can you run them with no air upgrades.
There, that's my $.05! (inflation )

[KBdiesel]

I'm thinking about getting the 330's but also found some Bosch 210hp #432133899. I really haven't found any info or anyone running them.

[BIG C]

THANKS FOR THE FEEDBACK!!!
Here's some more info
The trannys just had a major overhaul, including all new frictions/steels in the clutch packs ,new pump, new valve body / shift kit. the only down side was it got a 'rebuilt' converter put in.I was away when it happened.
I believe it's coming out because the truck has way less bottom end then before the rebuild.
So the request for more info continues
any thoughts on a converter?

what kind of hp and torque can easily be achieved with these ol 12 valvers and still be reliable to tow and haul with.

[Ace]

I can only speak from the experience of stories I've seen related on these boards. The direction my truck seems headed and the numbers it's been making along the way seem to support it, tho.

It seems to me the fuel necessary for increased power starts to become a towing liability (EGT) somewhere around the 300hp mark, unless you are steppng up to twins, or at least a big single with the intake and exhaust mods to match.

[dpuckett]

First, towing 10-12K in the mountains at 75-80 is a tall order for anything short of 500hp/ 1200ft-lbs torque. 55-60 is much more achievable and less costly all around, plus, I dont think 75 is safe on many moutain roads. Go 75-80 on I25 and out east for sure.

I'd get the tranny up to hold the power level you want in the end. Then, go for some slightly bigger sticks- focusing on efficiency more so than all out power. ALso, air flow enhancement is going to be a must- at least a Stage4, possibly a S300 or HX40. At your altitude, you will also need to stpe up your timing about .2-.3mm above what you'd run at sea level.

Daniel

[PToombs]

I towed about 10k once since I put my big sticks in. It got a little warm, and I was in medium hills. A little less fuel and it would probably be ok. But I have air upgrades too, which helped a lot.

[CumminsPride]

PTOOMBS, Did you have any valet on there at that time? In my post I did suggest a stageIV and a valet if bigger than 190's. I have heard the 370's get along pretty good towing with air and a valet. Plus the power is there when the trailer isn't!

Wade

[bgbubabrwn]

Would an hx35 be considered an upgrade over the stock turbo? and what are valets?

[flashgordon]

Would an hx35 be considered an upgrade over the stock turbo? and what are valets?

The Hx35 would be a improvement over the stock.......mostly because of the faster spooling 12cm exh. housing......which, you could bolt on to you stock turbo...........now the two would be vary close to equal.............unless your ride is a non intercooled turbo (has smaller compressor wheel and housing)
If your going past 190's I don't thing you will be able to upgrade your stock or a Hx35 to keep it cool enough when towing.

There is a tube that runs from the manifold (head) to the side on the injection pump. this is what help to control or add fuel when boost levels increase. By blocking this tube with a valve that can be opened(normal mode) and close(Valet mode) you can reduce the fuel/power of a two large injector for towing.

Flash

[PToombs]

CP, my valet has been on the truck over a year. There is a BIG difference with it on or off. I had it on/off/on, mostly playing with it. The hills weren't big enough to really worry about it being on.
Last summer with stock injectors and turbo, (16cm) the screw in farther than now, and towing 11-12k, off was 1200* on a hill. When I turned it on, it was like hitting nitrous in a 13 second street car. Then the egt's shot right to 1400*and stayed close to there. If I turned it off, speed would drop, then egt's. I couldn't hold 65-70 mph on the bigger hills with it off. I haven't towed much with the 370's, so I can't compare. I need to get out on the highway to really see.

Flash, you should be able to run 190's on a stock turbo. Smaller than stock= less fuel, better atomization= more power per cc.