I just installed a DiPricol Pyrometer that i got from DPPI. I used the thermocouple that they supplied in their kit. I think that my gauge or something is messed up. the needle moves up and down quite a bit. if i get on it it will rise up to around 1000°F and as soon as i let off of it it will drop back down. Today while i was coming home from work( ~45mph 10 minute drive) it was sitting around 300° and then when i stopped at the light for a couple minutes or so, it dropped to ~150°. now i am thinking this is too low.

i have attached some pictures. to show where i tapped the manifold. i dont think the gauge is bad cause i just installed it last night. did i not put the thermocouple deep enough?

please help...

 

Install looks good #'s are not...I've never seen 150 even on cold mornings once it starts its 300+. Bad thermocouple? Take it out and put a heat gun on it and see how it responds. I have the couple in mid way into the manifold. held it next the manifold to estimate mid way and marked with piece of tape. Install and remove tape...

 

Don't know much about their pyro, but my IssPRO model was specifically market for pre-turbo. The Post Turbo model was slightly different. Don't know if that is really an issue, but thought I would throw it out here...

 

You didn't extend the wiring any did you?

Any added wire will mess up the readings, they are calibrated for the exact length of wire they come with.

You can add wire after the amplifier box, but not before.


phox

 

I know on my isspro when ideling its around 300 but if iam commin down hill and not giving any skinny pedal it will drop down to the 150 200 mark once i give some throttle it will pick back up

 

I used the harness that came with the thermocouple and the DiPricol wiring harness. I did not add any length of wire. Also i do not think i have an amplifier box unless it is inside the gauge.

 

This is almost exactly what mine does. maybe i just dont drive hard enough therefore it doesnt get that hot. ill have to test it out when i go on a longer drive.

 

Some guages do have the amplifier as part of the guage.

They guage should move quite a bit, moreso before everything gets up to temp.

I've seen mine get down below 300 when coming down a long hill, not using the skinny pedal at all.
Otherwise, it idles around 300, cruising will be between 600-900, getting on it will flirt with the red zone pretty quick.


phox

 

both of my trucks have autometer pyro before the turbo both idle around 300 and cruise around 8 temp shoots up and down rapidly with pedal response

 

Mine is post turbo and idles around 300 and cruises between 600 and 900.

Haven't seen 1000 even pulling my 5th wheel.

___________________________________________
1999 2500, 4" exhaust, turbo turned up to 35 psi, K&N cold air filter pak.

 

Something is wrong with the gauge. Moving around rapidly is normal but dropping to 150 isn't. Send it back.
The best gauges have no amps at all, internal or external. My bet is your gauge only has wiring for the lighting.

That's because post turbo can read 300-500° lower than pre, you might be getting into the danger zone without knowing it.

 

Whoops, meant lower.

 

after looking around on the internet i notice that my thermocouple came with some heat shrink that i did NOT shrink over the lead wire connections. the thermocouple did not come with any directions so i thought it was a protective sleeve for the thermocouple...


anyway, could the lack of some sort of insulation over these wires be causing problems with gauge readings?

 

If the terminals touch then it should read either Zero or Max not sure how they are set up, usually they read the Max?

It does not hurt to heat shrink it though.

 

there is no possile way that they could have been touching. However, i did just slide the heat shrinking over the terminals. I also covered that with a piece of 5/16 fuel line.

i read somewhere that the leads need to be protected from heat and radiation. i assume this is to get a good reading.

i will report back later this evening or tomorrow after i have driven it a little bit.

out of curiosity, why would low temperatures be a bad thing?