Touchy subject - engine failure on dyno

[takai]

Ive had a tuner reset the rev limit on the race car to 9200rpm, which resulted in both a crank and harmonic balancer failure, and probably contributed to the flywheel failure.

Do i blame him? A little, but i didnt specifically ask him not to and it was making more power. In the end it's just part of building and racing cars.

[dirtyrex]

I think I've read every post.

Were the AFR's when it blew up fine or not?! If it was in what you consider safe, then it's no ones fault.
If the tuner was stretching the limits and melted the pistons, as the owner, I would be pissed.
Simple.

[MWP]

but in this case that isnt it , he has spent over $30000 on the car now , if i tell him he needs it he will just buy it , all parts are top quality

And he's running a Microtech?

[edit]
Replied from last page... i see its now been mentioned above ^^^^

[tinkerbell]

theres no variables when it comes to afr's its either right or it isnt.

I think it is worth repeating that there's so much more to it than just AFR (which, i might add, is usually read from a dodgy 3 mth old O2 sensor that is jammed halfway inside the tail pipe)

[260BC]

Ive had a tuner reset the rev limit on the race car to 9200rpm, which resulted in both a crank and harmonic balancer failure, and probably contributed to the flywheel failure.

Do i blame him? A little, but i didnt specifically ask him not to and it was making more power. In the end it's just part of building and racing cars.

Fair enough too. Before the Z goes on a dyno I list items that may be relevant such as rev and boost limits, all written down and included in a folder that contains other info that may also be relevant, such as cam details. No pressure on the tuner, give me whatever reliable power the engine is capable of within those parameters. If it's not enough then that's my problem.

[takai]

Fair enough too. Before the Z goes on a dyno I list items that may be relevant such as rev and boost limits, all written down and included in a folder that contains other info that may also be relevant, such as cam details. No pressure on the tuner, give me whatever reliable power the engine is capable of within those parameters. If it's not enough then that's my problem.

Aye, ditto.

To clarify the "a little" in my original post stems mostly from him not telling me that he had raised the rev limit to 9200rpm.

[RNS-11Z]

microwho?

[Grumpy Rooster]

I think I've read every post.

Were the AFR's when it blew up fine or not?! If it was in what you consider safe, then it's no ones fault.
If the tuner was stretching the limits and melted the pistons, as the owner, I would be pissed.
Simple.

That sums it up. If the tuner was negligent then he has a case with the tuner. If the tune was fine then its tough shit.

Its all duty of care and proving negligence. No negligence, no case.

[itsnotagsr]

Unfortunately we live in an era where dyno sheets are more important than driveability.

[TonyJZX]

rbaby?

[Grumpy Rooster]

RBABY plates are now on a purplish Boxster. Saw it a few weeks ago.

[TonyJZX]

drug dealing IS lucrative!

[Momus]

I think it is worth repeating that there's so much more to it than just AFR (which, i might add, is usually read from a dodgy 3 mth old O2 sensor that is jammed halfway inside the tail pipe)

This.
How can you properly tune anything let alone a high boost turbo without individual cylinder mixture and egt monitoring?

[TT]

big dollar builds in GTRs usually include multiple O2 sensors, aftermarket knock sensors, and an ECU that can take all that data and control and it.

not sure why he/you didn't do similar in this build.

[tinkerbell]

do Microtechs have datalogging as standard??