# Wastegate preload

**URL:** <https://turborenault.co.uk/t/wastegate-preload/32648>\
**Category:** Issues or a query with your Modern RenaultSport?\
**Tags:** meganesport, megane-sport, megane\
**Created:** [October 3, 2016, 3:30pm UTC](https://turborenault.co.uk/t/wastegate-preload/32648 "2016-10-03T15:30:50Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![ToniMQ](https://turborenault.co.uk/user_avatar/turborenault.co.uk/tonimq/32/585_2.png) [@ToniMQ](https://turborenault.co.uk/u/ToniMQ)\
**Post date:** [October 3, 2016, 3:30pm UTC](https://turborenault.co.uk/t/wastegate-preload/32648/1 "2016-10-03T15:30:50Z")

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hi!  
I have a trouble with a Megane R26 that comes from an unknown tuner. They messed up the wastegate pre-load and now we have some problems to adust at the OEM values.

I have a Mityvac, iirc should be around 0.38BAR?

Cheers!

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**Author:** ![DaveL485](https://turborenault.co.uk/user_avatar/turborenault.co.uk/davel485/32/12_2.png) [@DaveL485](https://turborenault.co.uk/u/DaveL485)\
**Post date:** [October 4, 2016, 7:58am UTC](https://turborenault.co.uk/t/wastegate-preload/32648/2 "2016-10-04T07:58:54Z")

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0.8bar, or 11.6psi for the 225 engines I think.

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**Author:** ![tutuur](https://turborenault.co.uk/user_avatar/turborenault.co.uk/tutuur/32/218_2.png) [@tutuur](https://turborenault.co.uk/u/tutuur)\
**Post date:** [October 4, 2016, 9:50am UTC](https://turborenault.co.uk/t/wastegate-preload/32648/3 "2016-10-04T09:50:51Z")

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Only way you would be able to reset it to standard value is to set the boost DC to zero and datalog how much boost it produces which indeed should be around .38bar.

Easier option is to count the threads from a non fiddled wastegate, i can do this for you tonight if you like

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**Author:** ![ToniMQ](https://turborenault.co.uk/user_avatar/turborenault.co.uk/tonimq/32/585_2.png) [@ToniMQ](https://turborenault.co.uk/u/ToniMQ)\
**Post date:** [October 4, 2016, 1:41pm UTC](https://turborenault.co.uk/t/wastegate-preload/32648/4 "2016-10-04T13:41:05Z")

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> [@tutuur](#):
>
> Only way you would be able to reset it to standard value is to set the boost DC to zero and datalog how much boost it produces which indeed should be around .38bar.
> 
> Easier option is to count the threads from a non fiddled wastegate, i can do this for you tonight if you like

I will disconnect the N75 and check the pressure at WOT. I’ll try to adjust between 0.38-0.40BAR

Cheers!

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**Author:** ![tutuur](https://turborenault.co.uk/user_avatar/turborenault.co.uk/tutuur/32/218_2.png) [@tutuur](https://turborenault.co.uk/u/tutuur)\
**Post date:** [October 4, 2016, 10:33pm UTC](https://turborenault.co.uk/t/wastegate-preload/32648/5 "2016-10-04T22:33:21Z")

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I think it will go into limp when you disconnect the n75 so you won’t get throttle opening above 20%, i’ll check the threads tomorrow and report back

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**Author:** ![ToniMQ](https://turborenault.co.uk/user_avatar/turborenault.co.uk/tonimq/32/585_2.png) [@ToniMQ](https://turborenault.co.uk/u/ToniMQ)\
**Post date:** [October 5, 2016, 8:47am UTC](https://turborenault.co.uk/t/wastegate-preload/32648/6 "2016-10-05T08:47:47Z")

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I had some free time to adjust it with the mityvac, spring preload at 0.4bar, no fault codes either limp mode :boast.gif:

Cheers!

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**Author:** ![tutuur](https://turborenault.co.uk/user_avatar/turborenault.co.uk/tutuur/32/218_2.png) [@tutuur](https://turborenault.co.uk/u/tutuur)\
**Post date:** [October 5, 2016, 10:12am UTC](https://turborenault.co.uk/t/wastegate-preload/32648/7 "2016-10-05T10:12:57Z")

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Nice