HP Junkies Turbo my 3.2 Part 2

[930fan]

[WydRyd]

Ummm - are those heat shield bag things effective enough to protect the rear bumper from the immense heat generated by the twin turbocharger's exhaust housings?

Also, that 911tt in that URL looks very familiar! Looks like the 930tt that Stephen of ImagineAuto built! Is that it?

Richard, there is no such thing as an ignoranus question. We're all here to learn about our cars and mods so don't feel bad.

Typically, the general feeling about cooling down a turbo engine before shutting down is to just take it easy the last km or mile before you get to your destination and then just turning off as per normal. This gives the turbo time to cool down whilst out of boost, allowing a quick exit

Personally, I like the idea of installing a turbo-timer that's set for at least 1 min just in case I forget to take it easy up my driveway Just a bit of insurance for those extra quick get-aways. If you don't want the timer to kick in, most timers have a manual cut-off anyway, so you can just turn-off immediately if you have been taking it easy. Be cautious tho, ensure you have an alarm system that takes in consideration turbo timers, so the car is armed even if left running by the turbo timer. I would hate to leave an alarmless 911 sitting idle in a parking lot

I'm not too sure about SC's though. I guess they also need oil to cool the bearings, so some cool down period might be required.

[dickster]

cheers merv

[Colby]

The general opinion upon the Talon camp back in the day was that turbo timers were not necessary. Back in the 80's and earlier, the turbo oil passages were really small and most ppl didn't run synthetics). This allowed the hot oil sitting in the passages to coke (when the oil burns and turns into black crud) in these passages. This would restrict oil flow and ultimately fry the turbo. Modern turbos have much larger oil passages and synthetic oils are much more resistant to coking (always run synthetic oil in turbo cars for this reason) so turbo timers arent necessary. We did just what you said; ran it off boost for the last minutes of our drive so the turbo could cool down.

Those pics are exactly what I had in mind. I want to mount them behind the motor, like in the bottom pic, then have the air output go up into the back of the intercooler. Those turbos are HUGE, which is reassuring (if they can fit those back there, then I will have no problem fitting mine).

Colby

[RarlyL8]

Colby - that is how I am going to mount my turbos, out the back off the SSIs.
You have to have an oil scavenging system (such as the 930) to do it right. Notice on Stephen's old car (Monster) the oil accumulator on the right.
Keep me posted as to your progress and I'll come up when the time is right.

Rich - whipplechargers run MUCH cooler than turbos. Don't let anyone tell you different. 1500F exhaust temps? Not with a supercharger. Most supercharged cars don't run intercoolers, they don't need to (unless the CR is too high).
You should build your vehicle to match its intended use. Street cars are quicker with superchargers. Road and race cars are faster with turbos. There IS a difference between quick and fast.
Talk to Mark Hargett. He'll give you the full skinny on both.

Personally, I have no preference. Supercharging and turbocharging both have there place and application.