Alright, back from the strip after 48 hours of intense work.
The news is mostly bleak. I'll start with the good news. I went back to the dyno last night to tune fuel for 25 psi of boost, and was there till 2am (didn't get on the rollers till 11pm). The LSD held 50 dyno pulls without a hitch (numbers between 340 and 500 whp, 350-490 lb-ft). 20 psi was the max attained, I think my 10psi wastegate spring is getting tired.
Today at the track the car lasted exactly one burnout and when I lined up and launched it moved exactly 13 inches. Something inside the driveline broke, and as of right now I don't know until I tear it down. Engine runs, gears engage, but nothing happens. I've never broken a first gear on launching, and I wasn't any more or less aggressive than usual. 5,000 rpm launch with the 26" slicks at 5.5 psi isn't exactly light duty though.
So, tomorrow or monday I take down the transmission and I do the autopsy and see what's up. There are chances that the clutch expired, but there are no noises or parts floating around.
The only visual cue that something is amiss is that the driver side axle is sticking out of the transmission about 1/8" more than usual. I don't know if this means that the diff. moved or if it just kicked out the axle a little or what the deal is.
So between yesterday and today I dropped $500 (dyno, alignment, track fees, fuel) and have nothing to show for it, but we'll try again. There are good days, and bad days, and this was definitely closer to bad than good.
On another note, I will never buy any tools that don't say "Made in the USA/Japan/Germany" ever again.
Dyno at 2 am....at Midnight Performance, ironically:
The news is mostly bleak. I'll start with the good news. I went back to the dyno last night to tune fuel for 25 psi of boost, and was there till 2am (didn't get on the rollers till 11pm). The LSD held 50 dyno pulls without a hitch (numbers between 340 and 500 whp, 350-490 lb-ft). 20 psi was the max attained, I think my 10psi wastegate spring is getting tired.
Today at the track the car lasted exactly one burnout and when I lined up and launched it moved exactly 13 inches. Something inside the driveline broke, and as of right now I don't know until I tear it down. Engine runs, gears engage, but nothing happens. I've never broken a first gear on launching, and I wasn't any more or less aggressive than usual. 5,000 rpm launch with the 26" slicks at 5.5 psi isn't exactly light duty though.
So, tomorrow or monday I take down the transmission and I do the autopsy and see what's up. There are chances that the clutch expired, but there are no noises or parts floating around.
The only visual cue that something is amiss is that the driver side axle is sticking out of the transmission about 1/8" more than usual. I don't know if this means that the diff. moved or if it just kicked out the axle a little or what the deal is.
So between yesterday and today I dropped $500 (dyno, alignment, track fees, fuel) and have nothing to show for it, but we'll try again. There are good days, and bad days, and this was definitely closer to bad than good.
On another note, I will never buy any tools that don't say "Made in the USA/Japan/Germany" ever again.
Dyno at 2 am....at Midnight Performance, ironically:
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