Knocking back a job because they have previously found it too difficult sounds pretty honest to me, how about contacting them again and telling them the problem. They may be able to help, no harm trying.Originally Posted by BMWTurbo
Knocking back a job because they have previously found it too difficult sounds pretty honest to me, how about contacting them again and telling them the problem. They may be able to help, no harm trying.
They were clearly honest - not disputing that.
I'll give it to HS Tuesday to have another go, but will have a chat to them about the outcome if it isn't bang on after this.
I'm not keen on spending potentially $ hundreds more with another company in the hope they can do it either TBH.
May help to do the legwork and supply the tube for them.
Sorry, expressed myself badly. What I was getting at is to try to find out from Driveline Services why they could not balance the tailshaft they mentioned. Given the amount of work and analysis you have put into this so far it seems like it's time to look at all the components being used to see if there is a basic incompatability some where.
Fuck me rotten.... Cunts must be having a lend of me....
Just re-installed after the TS receieved a rear retube (chromoly) and rebalance today and the front tube looks like a banana... Appeared fine the other day, now it's fucked.
Video of the TS immediately after installation idling in 1st gear.
Ok. Not good.
I couldn't get a good sighting towards the front but it looked like it is running off center back at the unis. My immediate thought was poor assembly probably meaning uncentered, unclipped caps and maybe, hopefully but not, broached yoke earholes. It takes a special kind of effort to bend a chrome moly tube but virtually none make a hash of a uni refit if you dont have everything square.
Bit late now but I suggest to people that they insist any high performance tailshaft they commission be supplied unpainted so a proper inspection of it's build can be made.
Probably should have a CV in the center.
Last edited by Momus; 13-06-12 at 01:10 AM.
You're telling me. The shaft does feel better in use, can hardly notice the vibrations I had previously, but it thumps on hard acceleration.
Rear tube runs true (front and rear), centre bearing felt smooth, rear of front tube = banana(20thou at a guess), centre to front of front tube run true.
They used 2 new centre caps on the uni for the rear half and I suspect ddin't remove the UNI from the front yoke.
Coming out again tonight and back to have hte front retubed (more chromoly as the current tube is that 'tweaked' they can't reuse), using a new yoke. I will be dropping in to see it on the balancer, and check slow and fast spinning myself when it's done. Not going through this again.
Funny you mention the CV... If they don't get it right this time, will be a new shaft, new design using a CV in the centre. IE gearbox-guibo-shaft-centre bearing-CV-shaft-rear CV. I am a bit concerned about the thought of a commodore centre CV and it's strength?
To be honest the conversions I have done didn't require investigating bigger CV's than the garden variety Commodore V6 items.
There will be Commodore trainspotters lurking here I imagine who can tell us about the V8 options. A good driveshaft mob probably could as well if you know one...
Seems falcadores use a 86mm PCD 100mm OD CV Fixed and up to 94mm PCD 108mm OD Plunging. Fixed on the diff and plunging in the centre.
Currently, there is a 86mm PCD 100mm OD plunging on the nose of the diff, but.... I replace it every 1-2 years odd as they start clicking/becoming sloppy. I think a 100mm OD will fit in place of the 1310 Uni, but suspect a 108mm OD might be tight.
I thought I was dealing with a good mob, but questioning that heavily now.
Ignoring any runout issues, ask them what spec they are balancing to, typically G2.5 or 6.3 is a spec that we do impellers to, these are for speeds up to 2900rpm.
KEEP CALM.
I'll ask tomorrow when I drop it back in. I know they have commented thier balancer runs up to 3000RPM but I haven't asked re tolerances.
Got to see this in the balancer in it's raw state before painting. Wasn't much heating applied to straighten etc as I could see and no more than 4 thou run out along the shaft from what they told me.
Tolerances were 5gms on the ends, 3gms in the middle of each shaft.
There was all sort of things wrong with the shaft and yokes, they put a new centre uni in it, had to mill back the circlips and skim the caps to get the uni correct. We spun it up from 0-2600RPm odd in line and didn't notice any real vibrations. I then asked if we could offset the centre bearing 15mm and spun it up again and no vibrations again that I could really notice.
*EDIT* Fitted last night and run up on the stands again, tiny vibration at 65kph ish and possibly at 125kph(didn't spend any time at that speed), but smooth everywhere else.
99% happy with it, Seems to have a slight occassional knock in 1st gear under heavy acceleration, but I think a CSB adjustment will get rid of this. Worst case some silicon/eurothane in teh CSB rubber shoudl stiffen it jsut a fraction more to stop the knocking.
Last edited by BMWTurbo; 15-06-12 at 09:36 AM.
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