Oil temps !!??
Discussion
ARAF said:
Anyone know where the oil temperature sender unit is on these engines?
I can't see it in my manual, nor find reference in a parts list.
From what I've worked out Ian this is the exact problem...there isn't one !!! The oil temps are derived by the ECU from ECT and other factors.I can't see it in my manual, nor find reference in a parts list.
If we had a stock temp sensor I could have replaced it with my ProSport one and plugged my proper gauge in by now. My adapter shouldn't be much longer so soon enough we will have REAL data.
ARAF said:
Cheers. I can't believe no one has mentioned that before.
yup, thats the whole reason of this thread...we simply dont know how far out the ECU's guess work is. It could be that the oil temps are fine and stable but the ECU calc's show it as being too hot, We simply do not know. The scary thing is everyone simply tells me 'thats normal' and 'they all do that' lol.
Soon enough we shall know for sure.
I have done a bit more 'testing' to work out what is what regarding the temps. It appears from what Ive read the oil temps are derived from ECT figures, however a few checks seems to say otherwise.
I did a few 0-60 runs the other night trying out my new VBOX and saw oil temps had climbed to the 120* mark. I switched car off and restarted with the dash in 'Engineering Mode' where I saw the ECT was 92*. So yesterday when I went out from cold I ran in Engineering Mode again and noted that the ECT temp reached 88* while the oil temp was only 70. Then the ETC stayed at 88-90* while the oil temps gradually rose until they settled at 110*.
So there was NO direct correlation between the two temps at all. This leads me to believe there must be a temp sensor, possibly incorporated in the low level sensor, which could in fact be giving us more accurate readings than we giving it credit for.
When my adapter finally arrives from the states it will be the very first thing I do !
I did a few 0-60 runs the other night trying out my new VBOX and saw oil temps had climbed to the 120* mark. I switched car off and restarted with the dash in 'Engineering Mode' where I saw the ECT was 92*. So yesterday when I went out from cold I ran in Engineering Mode again and noted that the ECT temp reached 88* while the oil temp was only 70. Then the ETC stayed at 88-90* while the oil temps gradually rose until they settled at 110*.
So there was NO direct correlation between the two temps at all. This leads me to believe there must be a temp sensor, possibly incorporated in the low level sensor, which could in fact be giving us more accurate readings than we giving it credit for.
When my adapter finally arrives from the states it will be the very first thing I do !
stevieturbo said:
The schematic above is quite clear. There is a low level switch and a rheostat in a combined unit.
I did stick a temp sensor onto mine, just havent had a chance to give the car a blast to see if temps actually go anywhere nasty.
With just a couple of brief blasts, Oil temp never exceeded 90degC, although Ive also a colder stat at the minute so ECT sits around 73-75degC most of the time.
Hopefully doing a hillclimb next week ( if its dry ) so that should offer some better info.
If it stays dry this evening, might take a run up to check out the hill, as have never driven it before.
That's good to know someone else has fitted a temp gauge, Do you still have the stock one in the dash ? If so how did the two compare ?I did stick a temp sensor onto mine, just havent had a chance to give the car a blast to see if temps actually go anywhere nasty.
With just a couple of brief blasts, Oil temp never exceeded 90degC, although Ive also a colder stat at the minute so ECT sits around 73-75degC most of the time.
Hopefully doing a hillclimb next week ( if its dry ) so that should offer some better info.
If it stays dry this evening, might take a run up to check out the hill, as have never driven it before.
Still find it crazy that its taken 7 years to decide this needs some proper investigation as to whether its an issue or not
stevieturbo said:
Unless it's around a race track or something..it's very difficult to actually try and drive hard for a test...as it's just too dangerous on the open roads for that for any length of time.
But one things for sure...hot engine = very hot oil.
I can see 120-130c on a prolonged motorway hoonBut one things for sure...hot engine = very hot oil.
New unit oredered tonight and on the way.Hi Steve,
Cheers for updating this. I have not forgotten about this but just been really busy with my Jap crap
I just twin turbo'd an Auto that in stock NA form suffers with the box running too hot already. Some research found one of these to fit the stock sump plug thread which is working a treat for monitoring oil temps..
http://www.ebay.co.uk/itm/371141397945?_trksid=p20...
I did originally buy a oil cooler blanking plate from the States with a oil sender adapter for the R8 but as the car had literally just been serviced I wasn't happy with the amount of oil trying to come out when I attempted to fit it.
SO I shall buy a sump plug adapter similar to the link above and go that route as swapping sump plugs quickly can be done with pretty much zero oil loss (as I did with the auto box one). I have a Mitsi I'm breaking with £30k mods alone which has 11 AEM gauges fitted..yes 11 !!
SO I can now monitor pretty much everything and anything including moon cycles 
Once I have done some tests I will update this thread as to the accuracy of the stock gauge and real world oil temps.
Cheers for updating this. I have not forgotten about this but just been really busy with my Jap crap
I just twin turbo'd an Auto that in stock NA form suffers with the box running too hot already. Some research found one of these to fit the stock sump plug thread which is working a treat for monitoring oil temps..
http://www.ebay.co.uk/itm/371141397945?_trksid=p20...
I did originally buy a oil cooler blanking plate from the States with a oil sender adapter for the R8 but as the car had literally just been serviced I wasn't happy with the amount of oil trying to come out when I attempted to fit it.
SO I shall buy a sump plug adapter similar to the link above and go that route as swapping sump plugs quickly can be done with pretty much zero oil loss (as I did with the auto box one). I have a Mitsi I'm breaking with £30k mods alone which has 11 AEM gauges fitted..yes 11 !!
SO I can now monitor pretty much everything and anything including moon cycles Once I have done some tests I will update this thread as to the accuracy of the stock gauge and real world oil temps.
Gary H 2008 said:
Mmm...so I'd put money on +10 to +20 indicated through the range...
That's the way its looking going from Stevie's post. Roughly 20*c hotter oil temps than coolant temp meaning the gauge readings of 110 normal driving up to 130 spirited driving seems very much a reality !! I still have no confidence in running oil to those sort of temps. Ive not driven the R8 for weeks now so perhaps I should pull finger and get the plug and sensor fitted to put this speculation to bed. The cooler weather is upon us now so I missed my opportunity but I guess the main thing is comparing what the AEM gauge says VS's the OEM guestimator.
ARAF said:
The cooler weather won't save you, and I really don't like the idea of guessing oil temps when they are so high.
BTW, have you still got my stickers FB, or do I need to get some more - as our oil filter will be changed this week.
Yes mate, Still in the arm rest BTW, have you still got my stickers FB, or do I need to get some more - as our oil filter will be changed this week.
PM me your addy and I will fire them off first class tomorrow.stigmundfreud said:
what problems are reported on the vxr8s?
Oil temps reported by the stock gauge . IF they are anywhere near true then IMO there is a problem. On routine driving they sit at 110*c..already higher than I would like, after 10min spirited motorway driving I was up at 130*c. once again IF the stock gauge is relatively accurate then that is a major issue for me. Oil temps of 120+ will wreck even the best oils in not time.
So I am fitting a AEM oil temp gauge using a M14x1.5 sump plug adapter with a 1/8th NPT female threaded insert. I can then monitor and cross reference what the stock gauge reads VS the AEM. As before IF the stock gauge is accurate to a degree then I shall be fitting a nice beefy oil cooler with a 90* stat. If the stock gauge is miles out and temps remain below a REAL 110*c I will leave things alone.
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