Installing boost & Pyrometer Gauge Questions

[Ridgerat]

Finally getting to install my boost & pyrometer gauges today, so I'm looking for detailed installation instructions for my 91.



Seems like I've seen instructions listed on here before, but of course I can't find them now. Can anyone link me to previous threads or other locations with good instructions?



Thanks in advance!

RR

 

[dpuckett]

What brand do you have? It is normally pretty straightforward. There is a bolt in the intake manifold behind the AFC elbow for the boost gauge. TST or Fritz's site has pictures. I believe all 12V engines have the plug for the boost gauge. Drill and tap the manifold offset from dead center- split manifold, and driling dead center is not good. Wiring is simple- Red to neg; Yellow to pos on pyrometer.



Daniel

 

[rumblefish]

http://www.piersdiesel.com/TechPyroInstall.htm

 

[Ridgerat]

Thanks fellas! I searched a little harder and found enough info here to get the job done. All thats left is to drill & tap the manifold and install the sender. I had to shut down to go buy a 1/8" NPT tap, but I should be able to finish tomorrow morn.

 

[tugboatphil]

RR,



When I was ready to install my pyro, someone told me to not tap too far down. I did. I was worried that the probe might not get tight enough, but I haven't had any problems... yet. You REALLY don't have to tap very far.

 

[dpuckett]

And, with the 1/8NPT, if you booger it up, you can get drill and tap a 1/4NPT hole and get an adaptor.



DP

 

[Ridgerat]

Thanks, I'm heading out right now to finish the job so I'll keep that in mind.



BTW, I went for a spin last night to get the 1/8"NPT tap and the most boost I could get was 12psi. Is that about right? I'll admit I havn't researched it to well yet to know what to expect, but I thought I remember reading boost would be ~18-20 for a stock IC turbo/engine. I'm sure that information is somewhere in the TDR archives, just need to look when I get some time.



Later, RR.

 

[Furthur]

RR, my 92, which I think has a 16" housing, will just about hit 20 in 4th climbing eagle river hill... at 55mph, right at the top of the hill, then I have to get out of it. Just for reference.

 

[dpuckett]

12psi is a little low, IMO. I'd like to see 15-18 for a stock engine, manual or auto transmission. Which makes me think, is it an auto or manual? If your torque convertor is getting weak, it wont allow the engine to load like it should. Check for fuel and air restrictions. Or the pump may just need some tuning.



DP

 

[Ridgerat]

Its a manual G360.



Everything on the truck is stock, and so far nothing has been 'tuned'. We bought it from the original owner, (my wifes uncle) in '99. It has been really well maintained, but not yet modified. The wife drove it until we got her new 2006 Ram, now its mine to play with.



FWIW, the truck has about 120,000 miles.



Further, I'll try Eagle River hill later today or tomorrow for comparison.

 

[B.G. Smith]

It is hard/maybe impossible to get maximum boost with an unloaded truck. bg

 

[Furthur]

Are you sure you wanna do that with the roads the way they are now?! Good luck.



John

 

[dpuckett]

It is hard/maybe impossible to get maximum boost with an unloaded truck. bg

I've gotten within 2-3psi unloaded vs loaded, pedal to the floor. He will get close with an empty truck.

DP

 

[Ridgerat]

Ok Further, I finally got back out on the road last night. 12 psi boost was the most I could get between Chugiak and Anchorage. Again thats with an unloaded truck.



Any ideers dpuckett?



RR

 

[Moab4x4]

Would this be a good time to test the IC for pinholes by pressure testing it? I don't know how much boost you would develop though if it were leaky.....

Just another straw to grasp at.

Ken

 

[Furthur]

RR, the hill I was referencing is the one headed back eagle river valley. Coming off the stoplight, passing wally's, I can usually get into 4th at the bottom of the hill, and romp on it if traction is good and no interlopers on the road. Going past 55 right about the hill crest and coming into the speed governer, it almost hits 20.



Heck, last week (?), running into that wind (20-30 mph), with a light trailer, I was pulling 10 sometimes just cruising 65 on the highway.



Good luck,

John

 

[Ridgerat]

Thanks again guys, I'm back at work on the slope for 2 weeks, so I'll have to wait till I get back in town to figure it out.

 

[Sri Ram]

Ridgerat, what size turbo exhaust housing do you have? You may not get much higher than 12psi if you have the 21cm that was stock on a 91 intercooled.

 

[Ridgerat]

Sri Ram, I do not know what size it is, but I do know that it is stock and has never been replaced.



The truck runs good and has always been very reliable, just a little sluggish in my opinion. In the near future I'd like to start making some power upgrades, but not so much to compromise the reliability. Right now I'm just checking to make sure all the original equipment is functioning right to start with. So if 12 psi is about right, I'll quit picking on the turbo... . for now anyways!

 

[MEby]

Ridgerat, what size turbo exhaust housing do you have? You may not get much higher than 12psi if you have the 21cm that was stock on a 91 intercooled.

I'd say your boost is definately low, i'm getting 28 lbs boost now with a 21cm housing. (see sig)