Ken, I purchased a 78 hp Diablo chip from you for a 2002 PSD. It is working just fine. Here's my question: I have also installed a B and B Triflo pipe and thru-flow muffler. This system includes a 4" pipe right from the turbo. I also have just installed a pyrometer with the thermocouple in the new exhaust pipe an inch or two down. What temps should I be watching for and with this setup, could I go with an more extreme chip? What real gains might I see? Downside?
I use the truck for basic transportation, sometimes tow a 20' boat or a snowmobile trailer and maybe once or twice a year will tow a dump trailer with wood, manure or hay. Dump trailer could max the tow rating.
I also do a small amount of light snow plowing.
Thanks, Dwight

 

>Ken, I purchased a 78 hp Diablo chip from you for a 2002
>PSD. It is working just fine. Here's my question: I have
>also installed a B and B Triflo pipe and thru-flow muffler.
>This system includes a 4" pipe right from the turbo. I also
>have just installed a pyrometer with the thermocouple in the
>new exhaust pipe an inch or two down. What temps should I be
>watching for and with this setup,

1200+.

>could I go with an more
>extreme chip? What real gains might I see? Downside?

We can supply a 90 HP, a 110 HP and in some cases, a 125 HP.

Downside: big drop in mileage, possible erratic shifting if you don't change out the shift valve.

>I use the truck for basic transportation, sometimes tow a
>20' boat or a snowmobile trailer and maybe once or twice a
>year will tow a dump trailer with wood, manure or hay. Dump
>trailer could max the tow rating.

Higher chip = no towing.

 

[h1]>>>I also have just installed a pyrometer with the thermocouple in the new exhaust pipe an inch or two down. What temps should I be watching for and with this setup,...

1200+.[/h2]

Ken, I suspect you misunderstood him. It sounds like he has his thermocouple mounted post-turbo. The post-turbo max EGT is a whole lot less than 1,200.

I have both a pre-turbo and a post-turbo pyrometer. When my pre-turbo pyro is showing the red line of 1,250 to 1,300, the post-turbo pyro isn't even up to 900 yet.

 

That is correct. The thermocouple is mounted in the down pipe. The max temp so far (without heavy towing loads) is about 750 degreees. Normal operating range is 400 to 600.
Dwight

 

Yeah, I misread....

The pre-turbo temp should not go above 1250. At about 1270-1290 the blades will start to glow and flatten out (ie, ruin the turbo). Never go over 1260. The difference between pre and post turbo can be 300-450 degrees. You should mount a pre pyro on the manifold, driver's side.