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Thanks! I'll try this out as I had my car out last night to get some data logs and had to do some WOT pulls and at high speed the hood was wobbling all over. I thought it would fly open but it seems to be fully latched (I drop the hood shut from about 12"). I guess these rubber stoppers need...

Usually anything sub 8ºC (give or take) is when summer tyres begin to struggle as the compound begins to stiffen up. So I certainly wouldn't recommend really going at it near those freezing temperatures mentioned. The Bridgestone Potenza Sports I had fitted previously would break away without...

If people are considering all seasons, I don't know if they come in the Mustang sizing but the new Hankook Kinergy 4S2 (and 4S2X for SUVs) get great reviews. My dad had some fitted to his XC60 a few months ago. https://www.tyrereviews.com/Tyre/Hankook/Kinergy-4S2.htm and...

So do we think swapping out the valve is the best course of action here to try and cure the problem?

Yeah it is.

Cool, and then it should vent to atmosphere? But with a woosh not a flutter?

I thought when you decelerate and the the throttle body closes that the excess pressure is diverted out the bypass valve to give you the whoosh sound? But I'm getting fluttering because it's not escaping and is hitting the blades? Is that not right?

OK so some more 5k and 6k rpm pulls in various gears. And yep, fluttering when decelerating. Beefcake sent me a price for the maxflow race valve. Which they said flows more cfm. And is considered an upgrade. Will I have any problems if I push the button now. Will it be a straight swap. I'll...

Yeah sorry I know what you mean, I wasn't clear, my bad. I meant when I take the car out and accelerate / decelerate I'll see if I can hear any fluttering (instead of just rev'ing on the driveway). :)

I got boost. y0! (I think that's what the kids say) @Wengerd Performance helping work his magic!

Oh man, thanks @HKusp (and @Cory S). I've asked beefcake for a price on the race valve just to get that avenue of enquiry going. But I've been out and done a rev at idle whilst in Park, and unlike the YouTube video, I have no flutter. So I will take the car out later and see if I am...

Thanks. Not yet, it is still being tuned. Had it together just since Sunday.

Thanks that's a relief and good to know. I should really ask wengerd how much boost I'm running. I have no idea.

Cool thanks. I've reached out to beefcake as well to get their take on it. I'm guessing I need to get it fixed as the surge will be damaging the blower? Or is that a bit of nonsensical panic that is currently running through my head. 😁

Thanks. So sounds like the race valve might be required here? Odd they ship it with the "kit" if it isn't fit for purpose.

This chap Dan seems to have had better luck swapping to the race valve. In the video you can hear the flutter from the bypass model. I'm going to rev mine at lunch and see if I get similar flutter when in park. Thanks.

Oh. So Ive just read the guide again and it is already backed out from factory. In general, the spring adjuster should be left fully backed off as supplied. The valve opening point can be adjusted from 3" Hg (spring adjuster all the way out)... Well if that is the case, why did I hear...

Hey. I had to do some data logging yesterday for Wengerd and I noticed when I let off the gas in 3rd gear at 5k rpm the car made fluttering sounds as it decelerated. No whoosh. I've read online that this is compressor surge causing the sound and could be that the the bypass valve needs...

Thanks so much, and cheers for the help as well. :thumbsup:

Ahh. I knew that. lol 🤪 Good news is the short drive this evening for data logging cleared the airlock. Woo. I have hot air once more. It might have helped that the road was on an incline. But going to let car cool off and check the levels again tomorrow. Thanks for all the help!