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Feb 14, 2012 20:02:33 GMT
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The oil pumps differ from year to year rather then model to model. I'm pretty sure they all provide sufficient pumping pressure. Unless the crank pulley nut is lose or the feed tube is cracked then the only other possibility is a faulty oil pressure valve. I guess the pump might need a re-prime? You could remove the OPRV and crank? Messy, but might help rule out the cracked feed tube issue?
Like you said, rule out the gauge first...its likely a gremlin lol.
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vitesseefi
South West
Posts: 2,301
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Feb 14, 2012 21:35:36 GMT
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If the turbo oil feed is the only real change made it's got to be a suspect.....
Does the factory turbo oil feed pipework have a metering orifice in it anywhere to control flow through it? Does yours? You can get alot of oil down a 3 - 4mm pipe........
Nick
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1967 Triumph Vitesse convertible (old friend)
1996 Audi A6 2.5 TDI Avant (still durability testing)
1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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Feb 14, 2012 22:27:01 GMT
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Its metered by its port size (4.6mm IIRC) together with the pump pressure. To eleminate this as the cause in pressure drop, just screw the blanking plug back in and take a reading.
There must be pressure getting to the turbo, Gav reported turbo oil inlet seal failure.
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sumpcracker
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First port of call is to bung the oil feed again.
Nick, i did winder if the banjo bold is supposed to have a resriction in it or somthing, this would do it.
I think the gauge is reading correct tbh.
Oil pump prime is another thing, but i thought it would either pump or not pump rather than give insufficient pressure.
Also i now have a J boot/elbow blow off valve and breather pipes had to pay real money though!
And a boost gauge, went for a jom one as it looks factory.
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Feb 17, 2012 21:00:33 GMT
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These engines are often supplied with Turbo oil ports. The port is simply blanked off with a cap screw. Sometimes the alloy casting is un-tapped. To un-cap to atmosphere will cause a drop in pressure. (but how much...3 bar? To squeeze oil through a turbo bearing housing will cause some sort of restriction even with blown seals? (but 3 bar loss?) Gav has serious pressure figures even though the fudamentals have remained the same - big end bearing ect... I still see a gremlin lol. Something silly and not terminal  Wish I was there to see for myself but will have to guess like the rest of us |
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sumpcracker
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Hydraulic lifters - and they are quiet
Turbo oil feed bung ;
No tried that, it makes 0.1 bar difference.
Cranshaft bolt ;
No, I tightend it to 700000 nm
Oil level ;
Its above minimum and was fine below that before
Sender unit ;
Was fine before & it would surely now not work or read full if faulty.
Wiring - unlikely as the gauge and light are seperate wires and they both show a fault.
Could be earth fault but unlkely as everything eles fine - must check though.
So,looks like sump off unless lucky earth fault.
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sumpcracker
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Feb 19, 2012 19:09:24 GMT
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ChasR
RR Helper
motivation
Posts: 10,309
Club RR Member Number: 170
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1986 Porsche 944 T. ChasR
@chasr
Club Retro Rides Member 170
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Feb 20, 2012 22:59:54 GMT
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I have heard of the crank bolt needing to be tightened to 270ishNm with a torque wrench only really providing proof in comparison to people tightening heavily and hoping. Either way, I am going on it being something simple. Best of luck chap . |
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sumpcracker
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Feb 28, 2012 20:54:49 GMT
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Not crank bolt, not oil feed. Have tried 2 other senders and both are dud! 1 reads 5bar even with no ign (not connection) one reads 0 bar (earth) I'm thinking the problem is here somwhere and I'm going to try a mechanical gauge. Very annoying as I want to get on with other things now. Car is abandond as I was giving the audis love.    |
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Feb 29, 2012 22:41:53 GMT
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Check the oil pressure valve first you tart  WhaT you are readin' on the Gauge is within factory limits A session on Rennlist should help Says flickering on the low pressure bulb is cool - apparently... A million pages to go but.. |
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sumpcracker
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Mmm its a bit tight down there, has to be next tho, tried all else.
I even tried giveing it some down my street (no bonnet ect) omg its quick.
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Mark
Posted a lot
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E36 BMW 318is saloon (rare as a hens false tooth)
VW Caddy Maxi 2010 (usually full of Labradors)
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sumpcracker
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Relief valve was stuck, but ive not had a chance to try it as the o ring split on removal  It also took me a long time to get the dam o ring out of the hole as the relief valve came out on its own. On another note,the car has a stuter at low rpm's and I think its running rich (used £5 just running in gararge and down my street) I think this could be the AFM, its for a 944S rather than a Turbo. The stutter soon clears with some thottle as it comes on boost, runs rough then boosts hard as a mofo, giving a nice exhaust note and then an exhaust pop/ wastegate flutter on gearchange, when I breifly grabbed 2nd it spun the wheels and twiched as it came back on boost. That was enough to restart my mojo. |
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The response curve on the 944s AFM and the Turbo AFM are different - also, did you change over the throttle position switch? The turbo is a proper resistor - the NA cars was a what switch only. Been following your car since you were up on stanceworks and it got cross-posted to rennlist. Google and look at rogue tuning for a MAF setup.
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sumpcracker
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I now have a Turbo MAF, not tried it yet though.
TPS is turbo (no n/a parts left on now aside from cam/head)
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Mar 10, 2012 23:42:07 GMT
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I lent Gav the "S afm"- coz Gav noticed it would fit - unlike the 2.5 N/A versions. A good call as it has served well in the initial start up. (nothing else was expected.)
Apart from this, its a factory turbo transplant albiet with the odd trival mod - (well researched and Gav's own experince to boot)
Kudos fella.
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sumpcracker
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Mar 20, 2012 12:04:28 GMT
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Thanks Dave, il come round soon for the last parts... relief valve ect.
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sumpcracker
Posted a lot
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I got mild motorvation today and fitted the cooling system properly and bled it. no leaks! Surprising realy as it now has about 10 pipes it didnt have before. Fitted new oil feed o ring & copper washers. Put bonnet/ badge panel on and cable tied wires. Almost like a car now. Tried new relief but no change, plus the hydraulic tappets now sing a bit, so looks like sump off and new oil pick up next.. Sadly i wont be able to get near it for at least a week. Evidence of motorvation -  |
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Glad to hear it's coming along. Looks the absolute business. Least the weather's brightening up too!
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Last Edit: Apr 1, 2012 19:04:51 GMT by Lewis
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Wish I was there to see for myself but will have to guess like the rest of us 
