S60 D5 Ecu Upgrade

[Guest JM]

HI

IVE HAD MY S60 D5'S ECU UPGRADED TO GIVE OUT 210 BHP AND 475 nm OF TORQUE (350 ft/lb)

THE PROBLEM I HAVE NOW IS THAT IN 4th AND 5th GEAR UNDER HEAVY THROTTLE THE DRIVESHAFT VIBRATES AT 2000 rpm FOR AROUND 400 rpm. THIS DOESNT HAPPEN UNDER NORMAL DRIVING. IVE BEEN ASSURED BY THE COMPANY WHO DOES IT THAT THE DRIVESHAFT WOULD BE OK (THE OWNER HAVING THE SAME UPGRADE ON HIS S60 D5). HE SAYS HE DRIVES AROUND THE VIBRATION.

ANYONE OUT THERE WITH ANY COMMENTS, WOULD APPRECIATE SOME FEEDBACK

CHEERS

I have my S60 D5's 195hp and 411 Nm and I have same kind of problem. The clutch is slipping.

[Johann]

Where is redline on the D5 engines?

Officially 4500 on the D5 v1. The newer 185HP versions are 500 rpm higher.

[volflo]

Vaguely, something possibly on a type 2. Much more with Lancia, Alfa, and Mercedes all used them back in the ahem .. 50's, 60's, and 70's. on rear wheel drives. The idea was to reduce noise and vibration from the more common universal joint which grows longer and shorter through different arc moments.

In the case of Lancia V-6 they had a rear transaxle complete with clutch so the drive shaft was always turning at engine RPM. DeDion rear suspension and Cardan Blocks on the inboard and outboard axles. These were early versions of what we know today as CV joints which don't have the problems of U-joints or the donuts. There were 2-3 other designs in there that used flat disk, segmented star, eleptical shape that were brought over from eletric motors The UK missed these for Harvey Spicer had most of the market tied up before switching to CV joints.

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I'd really like to see a reliable source plotting that HP vs Torque rather than someone just posting my xyz does this for I've never seen that ratio even on turbo diesels.

Cheers,

GTM2U

fwik thats exactly what it is. I had the very same issue you are talking about with my latter bmw 330d after chipping it (510Nm). In low revs up to 2500 and full 'throttle' the car got so much torque that it pressed the hardy disc (what was mentioned as rubber donut before) that sits in the drive shaft afaik. the massive torque will then twist the hardy disc and of course cause an uneven rotation of the whole drive shaft. Thats what causes this deep humming noise that lets your whole car vibrate.

Let me tell you that i drove my BMW for about 35000 miles after that, when suddenly the whole gear box/ clutch slightly jumped out of place. I then couldnt engage the third and fourth gear. i stopped the car and put it in first which somehow made the whole thing snap back in somehow, everything was fine again after that. Apperently. I dont know if there is any connection but my intuition tells me that there is a relation....