How long for boost?

[Born2bwild1191]

So i got into a discussion with someone today about a 911 and how long you can keep a 930 in boost safely. Before it blows up or whatever. So, what better place to ask than the 930 forum Pelicanites? I'm not a 930 owner myself, only curious. Thanks guys.

[zcoker]

I've seen them on the track in boost all day long.

[Shadetree930]

You can stay on boost until
you run out of road. That happens fast in a 930.

[Born2bwild1191]

Well I know that, but the drivers hit the brakes and let off the gas to turn and stuff. i mean like full boost without any let offs at all. I mean it's a weird question and obviously not something that people test everyday. Just curious

[Born2bwild1191]

Oh wow, I didn't know you could do it like that i thought it would blow up. That's awesome. Thanks guys, you've settled an argument

[RarlyL8]

I can keep mine in boost for 15 seconds. That is how long it takes to get from 0-140mph which is redline in 5th gear.

[drmatera]

considering these things were ment for the autobahn, i think the car would run flat out longer than the drivers guts to hold the throttle to the floor would last.

[pkracer21j]

Originally Posted by Shadetree930

You can stay on boost until
you run out of road. That happens fast in a 930.

AMEN Brother. can't wait until turbopalooza 10

[Emission]

(My math sucks, but here is my estimate.)

Let's assume we have a straight and level road 250 miles long, and the ambient temp is 55 F.

You start out and go full boost, right foot to the floor. After about 45 seconds, you are at maximum velocity... say 160 mph.

At that rate, you are probably getting 10 mpg, or burning 1 gallon every 3.75 minutes. With a 22.4 gal fuel tank, it would run dry in about 84 minutes.

(You would have covered about 224 miles.)

- Mike

[mark houghton]

Originally Posted by Emission

(My math sucks, but here is my estimate.)

Let's assume we have a straight and level road 250 miles long, and the ambient temp is 55 F.

You start out and go full boost, right foot to the floor. After about 45 seconds, you are at maximum velocity... say 160 mph.

At that rate, you are probably getting 10 mpg, or burning 1 gallon every 3.75 minutes. With a 22.4 gal fuel tank, it would run dry in about 84 minutes.

(You would have covered about 224 miles.)

- Mike

...or 1.4 hours of full on 160+mph driving...if the tires don't overheat and disintegrate in the process.

[fredmeister]

Originally Posted by Emission

(My math sucks, but here is my estimate.)

Let's assume we have a straight and level road 250 miles long, and the ambient temp is 55 F.

You start out and go full boost, right foot to the floor. After about 45 seconds, you are at maximum velocity... say 160 mph.

At that rate, you are probably getting 10 mpg, or burning 1 gallon every 3.75 minutes. With a 22.4 gal fuel tank, it would run dry in about 84 minutes.

(You would have covered about 224 miles.)

- Mike

probably more like 7-8mpg since that is what i see on track days.
i would be more worried about the oil temps in a stock US car at full throttle for that long.

[Emission]

Originally Posted by fredmeister

probably more like 7-8mpg since that is what i see on track days.
i would be more worried about the oil temps in a stock US car at full throttle for that long.

So, about an hour of full boost... and then the party is over.

I'd assume the turbocharger would melt, or the intercooler lines would fail (again, due to heat). The temps under the decklid would be immense.

- Mike

[drmatera]

wouldn't the high speed help keep the temps in check? 160mph breeze would cetainly keep me cool

[Emission]

Originally Posted by drmatera

wouldn't the high speed help keep the temps in check? 160mph breeze would cetainly keep me cool

I think the wind velocity would help, but the (stock) system just isn't designed to handling 100 percent sustained boost for that long. Most street driving, even on the Autobahn, includes partial throttle (no boost), and coasting.

- Mike

[DDDD]

Originally Posted by RarlyL8

I can keep mine in boost for 15 seconds. That is how long it takes to get from 0-140mph which is redline in 5th gear.

Ha!

[DDDD]

Originally Posted by Born2bwild1191

Well I know that, but the drivers hit the brakes and let off the gas to turn and stuff. i mean like full boost without any let offs at all. I mean it's a weird question and obviously not something that people test everyday. Just curious

Until you hit a tree or a deer or the cops throw spikes under your wheels.

[RarlyL8]

I read a report years ago on the tests done on the 930 concerning longevity. They took the cars to a large oval track and using several drivers drove them continuously at 10% below redline in top gear for tens of thousands of miles, only stopping to re-fuel and change the oil.
According to the article that test is what established the maximum cruising RPM that appears in the owners literature.
So apparently you can stay on boost a long time in a stock 930.

[tj930]

..Which is nice to read.

(Aside from Warming-up and Cooling-down, I tend to use all the engine's power. )

[Les Paul]

I know some of you guys have cruised at 150 for extended periods of time. I know I have on an undisclosed highway I've known for years. Without a headwind and temps in the 30's it only takes about .5-.6 bar to sustain that speed. I have the Ruf front and rear spoilers and a 930's tail and it is really quite solid and planted feeling at that speed. I do know it takes .8 to get from 170+.