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Author: Subject: Supercharger noise advice
number-1

posted on 9/7/19 at 03:05 PM Reply With Quote
Supercharger noise advice

Has anyone supercharged a zetec engine before? or have any experience with a supercharger?

Mine wines soooooo much even on idle. Its an Eaton M62 from a Merc CLK. Ive changed the cone filter and put an OEM CLK airbox on but its still loud. Here is a video done by the previous owner. It is still this loud. Any ideas?


It failed noise test at bedford on both static and drive by. I have repacked the exhaust with Acousta-fil but think the issue is the Superchrger whine. A mate has a supercharged Atom and its so quiet compared to mine

Supercharger

[Edited on 9/7/19 by number-1]

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johnH20

posted on 9/7/19 at 05:24 PM Reply With Quote
Hi, Where is your throttle body? I run an S/C on my MX5, T/B is pre-charger. Virtually silent until you wind it past 4500, even then it is only a subdued whine. I have no experience but I am told by other MX5 owners that a post charger T/B can be extremely loud, not sure I understand why but must have something to do with the acoustics of an undamped S/C.
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number-1

posted on 9/7/19 at 05:32 PM Reply With Quote
I bought the car as it is so don't have too much knowledge of the ins and outs however the previous owner (who installed the SC) said there are 2 Tbs...1 before the SC and 1 after
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mark chandler

posted on 9/7/19 at 06:16 PM Reply With Quote
It should only whine loudly when it's boosting, it's possible that the bypass is sticking closed.

The inlet manifold TB's should open before the air filter side one or the air will back up making noise, when running flat out they can be very noisy anyway, my M90 howls.

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perksy

posted on 9/7/19 at 08:12 PM Reply With Quote
That's loud

It is definitely ALL caused by the supercharger ?

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JC

posted on 9/7/19 at 08:43 PM Reply With Quote
You canít hear the Eaton M45 on my car at all until it comes on boost - +1 for check the bypass isnít stuck.
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number-1

posted on 9/7/19 at 09:52 PM Reply With Quote
Cheers for the replies chaps.

I changed the cone filter and stuck an OEM merc airbox and filter and its made a small difference but listening to it today the noise is coming from the supercharger.

I will try and find the bypass and check it during the week.

From reading the build thread on another forum, the supercharger has been modded so its a direct drive pulley and not a clutch pulley? Not too sure if this makes a difference?

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coyoteboy

posted on 9/7/19 at 10:21 PM Reply With Quote
What does the interface plate look like between sc and manifold. And has someone "improved" it by blanking the pressure relief holes in the sc outlet?





Report your local potholes, it actually works!

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mark chandler

posted on 9/7/19 at 10:56 PM Reply With Quote
Clutch removal is fine, just stops it stirring at low throttle to improve economy, less drag off the crank.
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theduck

posted on 10/7/19 at 02:27 PM Reply With Quote
iirc this has a dual throttle body setup. Also, i think it has a switch designed to activate a boost control solenoid to bleed off boost when cruising as previous owner had issues at cruise.

EDIT: Found his post about it https://www.rhocar.org/index.php?/forums/topic/45912-supercharger-boost-control/&tab=comments#comment-376761

[Edited on 10/7/19 by theduck]

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number-1

posted on 10/7/19 at 04:04 PM Reply With Quote
Yeah mine is the same car. Thereís a switch fitted as per the link above. However, the engine noise is like it on both settings.
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number-1

posted on 10/7/19 at 09:25 PM Reply With Quote
Anyone know the benefit from having the dual throttle body set up?

The car is mainly for trackdays but Iíll be using it to drive too and from so not too fussed on general drive ability as the old owner was.

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maccavvy

posted on 11/7/19 at 06:20 PM Reply With Quote
I've got a supercharged 5.4 v8 and it's barely audible on idle
You have to rev it to make its noise ..
That's not right surely





Understeer , when the front hits a wall
Oversteer, when the back hits a wall
Horsepower ,how fast you hit the wall
Torque ,how far you take the wall with you

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mark chandler

posted on 11/7/19 at 06:25 PM Reply With Quote
quote:
Originally posted by number-1
Anyone know the benefit from having the dual throttle body set up?

The car is mainly for trackdays but Iíll be using it to drive too and from so not too fussed on general drive ability as the old owner was.


Throttle response, my db7 has 1 throttle body before the charger, before changing things make sure the vacuum operated bypass is working.

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Benzine

posted on 11/7/19 at 09:08 PM Reply With Quote
Sounds like a choir boy going between B and C. Sorry can't help on the diagnosis
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number-1

posted on 11/7/19 at 11:03 PM Reply With Quote
Thanks once again for the replies chaps. When im off next week ill test the bypass release valve and go from there. If that seems ok i will try and use one throttle body as most people i know only use 1.

I will keep you posted.

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JC

posted on 12/7/19 at 05:31 AM Reply With Quote
Probably a daft question, but is it using standard pulleys and ratios?
If it was spinning too fast at idle it might make it noisy...?

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number-1

posted on 12/7/19 at 01:06 PM Reply With Quote
Ive just had a read on the original build thread which can be fund here if anyone is curious Supercharged thread

From reading it....the Supercharger pulley is 55mm as it was changed to a direct drive charger as the original 90mm pulley was heavy and had poor ratios

Apparently it now has 2.3 pulley ratio

[Edited on 12/7/19 by number-1]

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