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Discussion Starter #1
What do you guys think the max safe cruising speed is on the supra? Assuming no traffic 4 lane highway like say driving from flagstaff to Albuquerque. I don't mean safe like not crash and die but safe for the drivetrain. I don't imagine that it engine would be happy cruising 5000 rpm and probably a couple pounds of boost for hours at a time. That's a lot of wear. I'd say 120 is probably the upper limit due to gearing. What you guys think?
 

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Need to think about the fact that Toyota installed differential coolers in Euro market Supras no doubt to deal with higher freeway cruising speeds. Sustained 120mph for hours at a time in a USDM Supra might bump diff fluid temps too high.
 

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Why would the car be at a couple lbs of boost for hours at a time? Driving on a consistently uphill road, both ways? There is no reason the car should get into boost when just cruising, unless there is a load on the engine, like from climbing a hill or aggressively passing.

Al
 

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Discussion Starter #4
Why would the car be at a couple lbs of boost for hours at a time? Driving on a consistently uphill road, both ways? There is no reason the car should get into boost when just cruising, unless there is a load on the engine, like from climbing a hill or aggressively passing.

Al
I figure if your going fast enough you'lload the engine enough to create boost. At 85 in my car it only pulls 7 on the vac gauge. So at say 130 or 140 it would probably have to be in boost just to overcome air resistance. And the diff coolers are a good point they are probably nessicary for high speed driving. Wheel bearings might get hot also. I don't imagine the trans would run into problems. I just think the rpms on the engine would be the biggest concern. But then again people road race all day and don't have issues for the most part.
 
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