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I only use my turbo timer to warm up the car in the morning.
Great way to start the car, remove the keys, then set it to 10 minutes countdown, then it can warm up with no risk of anyone driving off in it as if they drop the handbrake it'll cut out and of course the steering locks on too.
Generally you don't rag the ar$e off the car then turn it off anyhow so generally doesn't need to run down. My timer also does top speed and 0-400m 0-1km etc etc so has some other handy stuff.
Re tuning, I don't think it's worth taking the risk as others have mentioned............ it's not expensive to get it sorted properly so you can drive in the knowledge you're not doing any long term harm.
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