Clarification on Warm-up
05-14-2018, 08:19 AM
#1
Racer
Thread Starter
Clarification on Warm-up
I have read many posts where people write that they do not engage sport or sport + until temps are reached to sufficiently warm the oil. What is wrong with engaging sport or sport+ at any temp as long as 4k rpm's are not exceeded until oil temp reaches say, 170? Just curious???
05-14-2018, 09:12 AM
#2
Three Wheelin'
Some people seem to feel that because extra cooling is used in Sport and Sport +, engaging either will take longer for your oil to heat up to operating temps. That said, I have seen various threads where members have tried to test that theory and can't say there ever appears to be a clear answer, so I say click away on that Sport or Sport + button and as you say, just keep your revs down until oil is sufficiently warm.
05-14-2018, 10:16 AM
#3
PDK in auto and in sport plus should be avoided, because the car will take each gear till redline. But otherwise, and especially if you keep it in manual there is nothing against driving it in sport or sport plus while warming the car up. I select sport before starting up. ;-)
05-14-2018, 10:35 AM
#4
Three Wheelin'
I have read many posts where people write that they do not engage sport or sport + until temps are reached to sufficiently warm the oil. What is wrong with engaging sport or sport+ at any temp as long as 4k rpm's are not exceeded until oil temp reaches say, 170? Just curious???
Last edited by 911boy; 05-14-2018 at 11:12 AM.
05-14-2018, 11:55 AM
#5
Rennlist Member
Don’t know how much caution is really warranted. I put my car in sport mode upon start up and refrain from taking the engine past 4k rpms until oil temp. reaches 190oF.
05-14-2018, 12:52 PM
#6
Addict
Rennlist Member
Rennlist Member
Join Date: Oct 2003
Location: Gone. On the Open Road
Posts: 16,327
Received 1,542 Likes
on
1,006 Posts
Remember that virtually none of the engine ancillary functions (cooling, oiling, etc) are - these days - purely ‘mechanical’ or ‘electrical.’ Warm-up will happen at the fastest rate that the software allows regardless of mode. This will happen for a number of reasons.
Engine LOAD is far mode important to moderate during warm-up than is rpm. Or, IOWs, flooring a cold engine from idle to 4k rpm is worse than going to redline at 1/4-throttle, though both should be avoided.
Engine LOAD is far mode important to moderate during warm-up than is rpm. Or, IOWs, flooring a cold engine from idle to 4k rpm is worse than going to redline at 1/4-throttle, though both should be avoided.
05-14-2018, 01:47 PM
#7
Rennlist Member
As long as you aren't going over 4,000 RPM before you bring your oil up to temp, you're good. Here's the study I did on getting your oil up to temp in the various modes:
https://rennlist.com/forums/991/9738...emp-study.html
https://rennlist.com/forums/991/9738...emp-study.html
Trending Topics
05-14-2018, 02:52 PM
#8
Rennlist Member
I press the loud button and the sport button before turning the car on - drive it below 4k until the oil hits 80-85 C and then I beat on it. Simple 
The only anecdotal evidence I have regarding impacts on the amount of time it takes to warm up is really just what sort of cruising RPM's I subject the car to. The first 8-10 km of my drive are flat open highways, so if I'm in 7th gear, the car seems to warm up a fair bit slower than 6th gear, for example.
The only anecdotal evidence I have regarding impacts on the amount of time it takes to warm up is really just what sort of cruising RPM's I subject the car to. The first 8-10 km of my drive are flat open highways, so if I'm in 7th gear, the car seems to warm up a fair bit slower than 6th gear, for example.
05-14-2018, 03:05 PM
#9
I think the computer restricts the rpm shift when the engine/oil is cold. so even if you start your car with sport/sport+ the rpm will still act as non sport until the oil is up to temp.
I experience this on my c2s stick, with sport while the car is cold, the rpm is still low (as if the sport mode is not on) then once oil temp comes up it will raise the rpm (sport) mode.
I experience this on my c2s stick, with sport while the car is cold, the rpm is still low (as if the sport mode is not on) then once oil temp comes up it will raise the rpm (sport) mode.
05-14-2018, 03:33 PM
#11
Addict
Rennlist Member
Rennlist Member
Join Date: Oct 2003
Location: Gone. On the Open Road
Posts: 16,327
Received 1,542 Likes
on
1,006 Posts
To reiterate: avoiding high-load (i.e. heavy throttle) during warm-up is just as important as keeping the revs low. Folks seem to gloss-over the 'load' part when talking about warm-up.
One object of warm-up is to bring-up the core temperature of the pistons at - as much as possible - the same rate as the cylinder walls. The latter have a big heat sink - the aluminum block, heads, and circulating coolant - while the former have to dissipate heat more-passively. Either high rpm or high-load can cause the pistons to expand at a much greater rate than the cylinder walls. When this happens the gap between the piston skirts and cylinder wall becomes smaller. As it becomes smaller anything trapped in the ring gap (for instance loose silicon particles from the Lokasil process Porsche uses on our blocks) can cause scoring. If taken to the extreme pistons can contact the cylinder wall.
So, by all means avoid high rpm during warm-up, but also keep the foot light on the go-pedal.
One object of warm-up is to bring-up the core temperature of the pistons at - as much as possible - the same rate as the cylinder walls. The latter have a big heat sink - the aluminum block, heads, and circulating coolant - while the former have to dissipate heat more-passively. Either high rpm or high-load can cause the pistons to expand at a much greater rate than the cylinder walls. When this happens the gap between the piston skirts and cylinder wall becomes smaller. As it becomes smaller anything trapped in the ring gap (for instance loose silicon particles from the Lokasil process Porsche uses on our blocks) can cause scoring. If taken to the extreme pistons can contact the cylinder wall.
So, by all means avoid high rpm during warm-up, but also keep the foot light on the go-pedal.
05-14-2018, 04:24 PM
#13
Banned
Join Date: Jan 2013
Location: Chicagoland Area
Posts: 26,142
Likes: 0
Received 5,388 Likes
on
2,509 Posts
Originally Posted by s4one
I think the computer restricts the rpm shift when the engine/oil is cold. so even if you start your car with sport/sport+ the rpm will still act as non sport until the oil is up to temp.
I experience this on my c2s stick, with sport while the car is cold, the rpm is still low (as if the sport mode is not on) then once oil temp comes up it will raise the rpm (sport) mode.
I experience this on my c2s stick, with sport while the car is cold, the rpm is still low (as if the sport mode is not on) then once oil temp comes up it will raise the rpm (sport) mode.
05-14-2018, 05:07 PM
#15
Three Wheelin'