Fat guy in a little coat: 1981 Caddy

[sprstu]

The T3 turbo has mad lag, youre not going to get much power until youre almost at your fuel cut-off, sadly. It should be making more than 8psi, however. The first thing I would do is unplug the waste gate entirely. Just pull the hose off the waste gate side (not the turbo housing side) and clamp it or put a screw into it, just secure it for the time being. See if you get anything to change.
While you're pulling off that line check the action on the waste gate. I dont know how much movement you should get but if you feel like its binding or not getting to a fully closed position then you have your answer.
After that I would take out that huge fucking intercooler. There was no intercooler designed in this system, you dont need it to run properly. Find the stock turbo to intake elbow and run that (assuming this is a stock T3 or K24 in stock location up high on the head).

if those fail then you may have a fueling issue. These turbos are "fuel controlled" in that, you wont see much boost without the injector pump giving you a boot full of fuel. well as much as that stock pump will give, anyway.

Stock youre looking at 70hp and MAYBE 80ftlbs, not a whole lot going on there in the power department even if you're running perfectly. Where are you located?

[SLK]

Stock youre looking at 70hp and MAYBE 80ftlbs, not a whole lot going on there in the power department even if you're running perfectly. Where are you located?

I am not looking for a ton of power, I just want to be able to do highway speeds. I also would prefer if said highway speeds were obtainable by the end of an on ramp. Trying to merge on 35W when traffic is doing 60MPH and I am just barely over 40MPH isn't working out so hot.

I am in Apple Valley, but I work in NE Minneapolis.

[Digital K]

thats odd. I could always get to 40-50 without a turbo on most diesel mk1s. something is wrong.

[SLK]

thats odd. I could always get to 40-50 without a turbo on most diesel mk1s. something is wrong.

The PO did say that when he checked the compression, that the #1 cylinder was lower than the rest (like 10-15), but he didn't remember the exact numbers. Next on my list after checking over the turbo/waste gate is to check the compression.

IIRC I read somewhere that for these motors good compression should be around 450? Does that sound about right? And that anything below 400 was too low.

[Digital K]

400 would be okay.

[Digital K]

less would be bad though yes. frick, where is my diesel bentley?

[sprstu]

I do understand about wanting a turbo in this, I put one in my truck for good reason.

[Digital K]

The only issues I ever had was in and out of Duluth. Otherwise everything around here is 60 anyways.

[SLK]

The only issues I ever had was in and out of Duluth.

That's like my drive to work right now (only not nearly as steep as some of the stuff in Duluth). With all this road construction I just try to avoid Cedar at all costs so I take Pilot Knob to 55. Pilot Knob has some hills that if I am starting from a dead stop, I will only get up to about 30mph until I crest the hill, then I can get up to 60mph pretty quick and fly past all of the people who thought they were going to pass the 'slow truck'.


Oh and I found out today, that I rather need to clean out my garage so my Caddy can go in it or I need to fix my blower motor. One way or another, not having a way to defrost my windows sucks. I had to drive my wife's car to work because of it.

[hamradio]

that bigass intercooler is probably messing with stuff.

when I installed an srt4 intercooler in my diesel, it turned it from normal to lag monster.

also, make sure the little overpressure valve on the intake manifold isn't opening up too early.

[greengeeker]

Also I noticed something interesting, in 1st-3rd, if I am in the higher RPM's and have to let off for braking or just slowing down a bit, sometimes the truck will sort of bog really hard and start really bouncing until I ease back into the throttle.

if those fail then you may have a fueling issue. These turbos are "fuel controlled" in that, you wont see much boost without the injector pump giving you a boot full of fuel. well as much as that stock pump will give, anyway.

Sounds like a fuelling issue. Replace your filter, check your injection timing, etc.

What is the silver box inline between the IP and the filter head?

[SLK]

What is the silver box inline between the IP and the filter head?

It is an aux fuel pump that is only good for like 6 psi. It is on my list of things to remove. I keep wanting to work on the truck but then other stuff comes up.

Also quick question, the truck will top at around 62mph on flat ground, if I pull the cold start that will allow it to get up to 70mph on flat ground. For the time being until I get to work on it, is it ok to run it like this on the highway? Also from what I have read about it, is that it sounds like the timing isn't correct. The PO said he advanced it 1mm but part of me thinks rather he messed it up when he did or didn't actually do it at all.

[Digital K]

An aux fuel pump is a bad sign.

[JFettig]

Have you checked the injectors?

I have a couple pop testers.

I only scanned this thread but it sounds like you aren't making any smoke while trying to get on it. If the turbo isn't spooling, you would be making lots of smoke. If your injectors are bad, it wouldn't make enough exhaust energy to spool the turbo.

above discussion about the injection pump is also valid.

[grape ice cream]

If you put the T3 turbo on and your NA was low on power along with an electric pump, your pump is probably going out and is causing power loss, and adding the turbo will only make it go out faster. I have been told that the MK2 NA IP will work better with the T3 turbo than a Mk1 IP(or obviously the turbo IP).