Turbo Timer require each to setup their own cool-down time, usually a fixed time, and the late model even comes with speed and rpm input sensing adjusting to each driving style but both don't seems very effective, no doubt it's common to hear from friends asking you "Eh! how long should I set my turbo timer huh?". Once I saw a Australian dude with a temperature controlled (Analog Devices AD595 -S$34) delay-off circuit, it cut-off the ignition when a safe temperature is reach. I was temped to build one.. but got busy... and eventually got LAZY! this when on for the past few years and wanted to build one lately, recheck the schematic and most of the component are either over priced and obsolete PIC16C711 micro!  Search the web and found one commercial product selling for >S$380...! So I got it design, assemble a few component and wrote a few code, and here is it. No timing to worry about, a short drive wouldn't activate the cool-down, even if it does it's only a matter of few seconds, the hotter the turbocharger the longer the cool-down time or vis-vesa. Turbo timer is not a fresh topic, most of you should know how it works by now, if not search the web , there are plenty of information laying around. 

    I might be wrong.. but I don't see the reason why a diesel turbocharger would ever need a cool down timer, as it's a low rev engine 4-5K max rpm range, the turbocharger runs cooler then gasoline type and hardly goes beyond 400°C. Maybe is due to local Singapore speed limit / restriction and not many choices for me, now you all know can't really do much in Singapore... but I'll try one on a Malaysian 4x4 turbo truck when I have time to work on. Anyway the option are there for you to play around with.  

• JP1 - Engine type selector (select either Diesel or Gasoline type engine) Gasoline selected by default or ground the JUMPER to select Diesel type, difference between two temperature cut-off preset. Replace the Jumper with a switch ,if you like to try out on different engine type.
• RV1 - Preset Adjust for set temperature cut-off of  +/- 20°C.
• Engage Handbrake first before switching off the ignition key, this will complete the relay circuit for the cool-down to works, while releasing the handbrake during cool-down will immediately shut the engine down.
• Alarm output are optional - may vary between each alarm system is used.
• Average engine oil rated at >=400°C before it get "cooked" >>. Safe temperature delay-off for Gasoline preset at 320°C  and Diesel preset delay-off at 140°C.
• 7 Leds dot-graph (Temp. Gauge)
• 120 seconds delay-off Timeout.
• Use a aftermarket Turbo timer wiring hardness (if available for your vehicle), else you might need to cut and join your fresh ignition hardness.