Leave it to me to f*ck something good up...
03-12-2012, 08:40 AM
#1
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Leave it to me to f*ck something good up...
Man - craziness at Road Atlanta this weekend. So how many of you where hoping to see a mangled miata in flames? Sorry to dissappoint - so far!
1st off, the low mileage 6spd I bought and installed failed to shift into 5th - period. So that was a rough start - I'm at that point where I 'feel' I need to double/triple check everything now less anything bad happens - which it did.
So here I was cruising down the back straight at RA at about 120 when I heard a pop - saw no smoke. I got into the brake zone and suddenly smelled diff fluid so I stayed off line and pitted in, but nothing was feeling different with the car, all felt normal other than hearing the pop - which really wasn't any louder than picking up a large marble and slinging it into the well. So I pulled into paddock, parked and looked under the at the diff and sure enough, fluid seemed to be dripping out the left seal. So I yanked the diff and low and behold - holy **** - I just destroyed my OSG and 3.6 R&P!! F*CK!!!
The ASE mech I used to install the R&P and set the lash forgot to do something very important - seems he didn't torque or threadlock one of the bolts holding a lash retaining clip. I used this guy the 1st time when I put in the OSG with no problems, so didn't have any reason for not guessing his work this time.
Honestly, I dodged a hell of a bullet. The bolt did not mangle the R&P, in fact you couldn't see ANY damage to the R&P at all, nor on the OSG - so thankful for soft bolts. Of all the possibilies that could have happened - destroying a $2G diff and spinning out at 120 being the worst, I was the luckiest SOB at the track this weekend.
So, fix in effect - right across the paddock was a race shop, threw the shop guy $40 and he tigged up that hole in fine fashion. Threw the unit back together (after cleaning it well) and called Emilio for his expert advice on what fluid would work without effing up the clutch plates (since I didn't have that special OSG gear oil). Discovery Parts happened to have RedLine GL5 85-250 Shockproof gear oil - that pink looking stuff. Big thanks for the info Emilio!!
So this all happened on friday - ran saturday flawlessly, without 5th of course, which I really needed - that's like my 4th in a 5spd.
Then this poor soul had a date with the tirewall/concrete barrier out of T3...
And then the second to last run of the day I noticed drastic boost drop - and as I know of, I'm the 1st and only one to expeirence TSE Inconel stud failure...
The only thing I can think of is that the resbond did not hold the stud in, so 3, yes, 3 of the studs backed out through the locking fasteners. 2 of them are gone, somewhere on track, the 3rd was kept from falling out by the DP flange. So, I may yank the manifold off and send to Andrew for measurements and see if it was a failure of the resbond, mounting depth of the studs, or wall clearance between the stud and the threaded manifold - all? At this point, I need to get the 1.8 complete and beg/plead for my vband.
1st off, the low mileage 6spd I bought and installed failed to shift into 5th - period. So that was a rough start - I'm at that point where I 'feel' I need to double/triple check everything now less anything bad happens - which it did.
So here I was cruising down the back straight at RA at about 120 when I heard a pop - saw no smoke. I got into the brake zone and suddenly smelled diff fluid so I stayed off line and pitted in, but nothing was feeling different with the car, all felt normal other than hearing the pop - which really wasn't any louder than picking up a large marble and slinging it into the well. So I pulled into paddock, parked and looked under the at the diff and sure enough, fluid seemed to be dripping out the left seal. So I yanked the diff and low and behold - holy **** - I just destroyed my OSG and 3.6 R&P!! F*CK!!!
The ASE mech I used to install the R&P and set the lash forgot to do something very important - seems he didn't torque or threadlock one of the bolts holding a lash retaining clip. I used this guy the 1st time when I put in the OSG with no problems, so didn't have any reason for not guessing his work this time.
Honestly, I dodged a hell of a bullet. The bolt did not mangle the R&P, in fact you couldn't see ANY damage to the R&P at all, nor on the OSG - so thankful for soft bolts. Of all the possibilies that could have happened - destroying a $2G diff and spinning out at 120 being the worst, I was the luckiest SOB at the track this weekend.
So, fix in effect - right across the paddock was a race shop, threw the shop guy $40 and he tigged up that hole in fine fashion. Threw the unit back together (after cleaning it well) and called Emilio for his expert advice on what fluid would work without effing up the clutch plates (since I didn't have that special OSG gear oil). Discovery Parts happened to have RedLine GL5 85-250 Shockproof gear oil - that pink looking stuff. Big thanks for the info Emilio!!
So this all happened on friday - ran saturday flawlessly, without 5th of course, which I really needed - that's like my 4th in a 5spd.
Then this poor soul had a date with the tirewall/concrete barrier out of T3...
And then the second to last run of the day I noticed drastic boost drop - and as I know of, I'm the 1st and only one to expeirence TSE Inconel stud failure...
The only thing I can think of is that the resbond did not hold the stud in, so 3, yes, 3 of the studs backed out through the locking fasteners. 2 of them are gone, somewhere on track, the 3rd was kept from falling out by the DP flange. So, I may yank the manifold off and send to Andrew for measurements and see if it was a failure of the resbond, mounting depth of the studs, or wall clearance between the stud and the threaded manifold - all? At this point, I need to get the 1.8 complete and beg/plead for my vband.
Last edited by GeneSplicer; 03-12-2012 at 09:39 AM.
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03-12-2012, 09:26 AM
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At what EGT temps will resbond deteriorate? Met a miata guy who's an engineer with BW, and he was really insterested in my EGTs - he thinking my effiecency flow map is way out of spec with the motor.
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03-12-2012, 11:17 AM
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Lars - I was probably turning 1:41s but don't yet have a lap timer - even without having 5th gear. Other than that, still beat up on some vettes and mustangs - gt3s in the corners...
Lots of miss-shifting getting used to the trans
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03-12-2012, 04:43 PM
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I want to say there was there was some play, which would be the cause - this is why I debated sending you the manifold for inspection. I do not think it was a failure of the studs or locking hardware themselves, i think the tolerance between the studs and manifold was too great for the resbond to hold. I'll be ordering another set - I might have to get Abe involved if the stud holes are to large.
Last edited by GeneSplicer; 03-12-2012 at 07:22 PM.
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03-13-2012, 09:04 AM
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I fail to see how any of this would be your screw up. More like s--- happens. Maybe the diff was the installer's fault, but you can't be expected to inspect every last detail.
Looks like the welder did a nice job of it, though.
Looks like the welder did a nice job of it, though.
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03-13-2012, 03:28 PM
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Yeah, **** cetainly happened... but it could have been MUCH worse
Awwweee.... you butt hurt? Hehe 
Beers on me when you come on in we got the Mitty too...
btw, Melissa was canned from Jeffery's - dunno why but I miss seeing that *** of hers!
Beers on me when you come on in we got the Mitty too...btw, Melissa was canned from Jeffery's - dunno why but I miss seeing that *** of hers!
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