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Old 08-09-2020, 09:35 AM   #1
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Again, Deep sump

So, this old topic :-)

986s 2003. I run the X51 baffle in the oem oil pan. R-compounds (Cup2).

Under hard acceleration in a long righthander I have at some moments seen the oilpressure lamp flicker. Clearly this is not ok so before next session I need to adress it.

I know about the lack of scavenge pumps on bank1 (front) and bank2 (rear) so I guess it´s in my case oil pooling in bank2 so the pickup sucks air. Since adding scavenge pumps is very expensive and a bit complicated maybe, I believe my options are:
1) Deep sump
2) Accusump

Since the deep sump is far easier to install than the accusump, this is what I´m leaning at.

So, am I goint in the right direction? I´m looking at the FVD deep sump, are those extra 0.6 litres really enough to make a difference? Any advices from you guys?


Last edited by Robert986; 08-09-2020 at 09:37 AM.
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Old 08-09-2020, 10:42 AM   #2
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I went with the LN deep sump with the baffle/ plate that sandwiches between. It's the only one that made much sense to me. And it has worked very well.
Word of caution: test fit it first. The quality control at LN sucks BADLY. you'll be adjusting holes in both the baffle and the sump.

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Old 08-09-2020, 05:17 PM   #3
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I have the MantisSport 2 litre deep sump and never had any problems. I run the oil level around mid-range on the gauge to avoid smoke bombs with the assurance that there’s still lots of oil down below!
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Old 08-09-2020, 07:10 PM   #4
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Quote:
Originally Posted by Robert986 View Post
So, this old topic :-)

986s 2003. I run the X51 baffle in the oem oil pan. R-compounds (Cup2).

Under hard acceleration in a long righthander I have at some moments seen the oilpressure lamp flicker. Clearly this is not ok so before next session I need to adress it.

I know about the lack of scavenge pumps on bank1 (front) and bank2 (rear) so I guess it´s in my case oil pooling in bank2 so the pickup sucks air. Since adding scavenge pumps is very expensive and a bit complicated maybe, I believe my options are:
1) Deep sump
2) Accusump

Since the deep sump is far easier to install than the accusump, this is what I´m leaning at.

So, am I goint in the right direction? I´m looking at the FVD deep sump, are those extra 0.6 litres really enough to make a difference? Any advices from you guys?


I have the FVD pan, It comes with a X-51 style metal baffle & doors. It's a quality part. I run DT-40 oil & don't have any issues
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Old 08-10-2020, 01:07 AM   #5
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I have the FVD pan, It comes with a X-51 style metal baffle & doors. It's a quality part. I run DT-40 oil & don't have any issues
Did you have any issues before?

I feel that 0.6 liters is not very much, is it really enough. 2 liters Mantis looks like it give a bit too much reduction of ground clearance, I get the feeling I´d like somethng like 1 liter. But if 0,6 really works, then the FVD seems like a good choice.
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Old 08-10-2020, 06:13 AM   #6
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for you guys saying these things work, how are you monitoring your oil pressure?

I have ln deep sump with x51 baffle and horizontal baffle. Pressures drops all over the place.
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Old 08-10-2020, 07:47 AM   #7
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Did you have any issues before?

I feel that 0.6 liters is not very much, is it really enough. 2 liters Mantis looks like it give a bit too much reduction of ground clearance, I get the feeling I´d like somethng like 1 liter. But if 0,6 really works, then the FVD seems like a good choice.
Very brief oil pressure drops on track, but I just drive to the track & run with my street tires.
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Old 08-10-2020, 08:06 AM   #8
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I have a deep sump and X-51 steel baffle, and I don't monitor the oil pressure beyond the warning light, because that is all you need, right?

This issue inherent with the M96 is one reason why I only use 200 treadwear tires (Hankook RS4).
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Old 08-10-2020, 12:36 PM   #9
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I have a deep sump and X-51 steel baffle, and I don't monitor the oil pressure beyond the warning light, because that is all you need, right?

This issue inherent with the M96 is one reason why I only use 200 treadwear tires (Hankook RS4).


I believe Oil quality is the top priority. I use DT-40.
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Old 08-10-2020, 03:16 PM   #10
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As do I, BYprodriver!
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Old 08-10-2020, 03:19 PM   #11
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I believe Oil quality is the top priority. I use DT-40.
Oil quality means nothing if it doesn't get where it needs to go
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Old 08-10-2020, 04:52 PM   #12
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Quote:
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for you guys saying these things work, how are you monitoring your oil pressure?

I have ln deep sump with x51 baffle and horizontal baffle. Pressures drops all over the place.
Although I pull some fairly strong g’s with sticky tires, I don’t notice any significant pressure drops. I have separate VDO gauges for oil temperature and oil pressure.
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Old 08-10-2020, 07:30 PM   #13
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As do I, BYprodriver!
What oil are YOU using?

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Old 08-10-2020, 08:02 PM   #14
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What oil are YOU using?

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DT-40, although I don't think the brand has anything to do with oil pressure drop from hard cornering. That's caused by a poor design in the oil circulation system.
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Old 08-10-2020, 08:25 PM   #15
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DT-40, although I don't think the brand has anything to do with oil pressure drop from hard cornering. That's caused by a poor design in the oil circulation system.
No, but I DO think that a "better" lubricant is likely to mask more dips in pressure than a "lesser" lubricant. Y'know?

I dunno..... maybe that's naive.

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Old 08-11-2020, 01:10 AM   #16
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I´m certainly no Oil-expert, ut I do think that there might be a possibility to get less foaming with the right oil, thus better fill in the oil-pan. I run Mobil-1 5w-50, X51 baffles, OEM pan. Get some flickering pressure-lamp in hard cornering sometimes..

Reading all the great responses above, I think I might start by using the FVD 0,6l pan, if thats not enough, I guess the FVD-pan could easily be sold as used..
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Old 08-11-2020, 06:01 AM   #17
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Although I pull some fairly strong g’s with sticky tires, I don’t notice any significant pressure drops. I have separate VDO gauges for oil temperature and oil pressure.
interesting, do you have any video that shows the gauges while cornering?
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Old 08-11-2020, 07:43 AM   #18
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No, but I DO think that a "better" lubricant is likely to mask more dips in pressure than a "lesser" lubricant. Y'know?

I dunno..... maybe that's naive.

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It can't hurt to have a good oil, that's for sure. But the root problem is still there.
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Old 08-11-2020, 11:53 AM   #19
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For what it is worth I run XP9, have an LN deep sump and the oil pressure does vary widely. Pretty much the same as when I ran an X51 only.

Your gauge sampling rate will effect what dips you see. AIM will use 5-10hz for a pressure sensor, don't know about a VDO gauge.

If you do install a deep sump on a car that is run on the street, install some sort of sump guard. You won't regret it.
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Old 08-11-2020, 12:21 PM   #20
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I have the MantisSport 2 litre deep sump and never had any problems. I run the oil level around mid-range on the gauge to avoid smoke bombs with the assurance that there’s still lots of oil down below!
Being Canadian and very close to Msntis I have run the Mantis 1.5 for years and never had a flickering oil pressure light on street biased tires at Mosport and Shanonville.

Way back it seemed to be the only design with a windage tray trapping the sump volume so I went with it rather than risking the engine. Never saw the point of the x51 when oil could escape upward irrespective of the baffles being steel or otherwise

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