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woo woo sound between 2100 and 2300 RPM on acceleration

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Goosey
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Joined: Tue Oct 30, 2018 5:19 pm
Year and Model: 1999 V70 XC
Location: North Saanich BC

Re: woo woo sound between 2100 and 2300 RPM on acceleration

Post by Goosey »

It's an automatic and it happens at any speed once I get near 2100 RPM. It's a grrrr sound that changes to an oscillating grrrr between 2100 and about 2300. If I boot it before it reaches 2100 and it shifts so it jumps to above 2300 it doesn't wobble until if drops back to between those RPMs. And the grrrr happens in reverse.

Isn't this fun. I've been trying to figure this out for months.
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WhatAmIDoing
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Re: woo woo sound between 2100 and 2300 RPM on acceleration

Post by WhatAmIDoing »

On the autos, I think the computer cuts boost in park and neutral. So if it is turbo related you might only notice when in drive.
'98 S70 T5M - 282,000+mi - forever a project
'99 S70 "AWD" - 220,000+mi - part out :cry:
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Goosey
Posts: 10
Joined: Tue Oct 30, 2018 5:19 pm
Year and Model: 1999 V70 XC
Location: North Saanich BC

Re: woo woo sound between 2100 and 2300 RPM on acceleration

Post by Goosey »

It sounds like the likely culprit is the turbo and I should pull it and have a look at the gaskets. Just a question, do you think the sound is the waste gate cycling open and closed at that RPM
dj_v70
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Re: woo woo sound between 2100 and 2300 RPM on acceleration

Post by dj_v70 »

If I understood you correctly it happens in all gears, therefore it is highly likely to be engine related.

Can you recreate it while stopped to verify my statement above? While car is stopped, put car in drive and one foot hard on the brake. Use other foot to push rpms up into range that issue occurs (make sure no one is in front of you, etc in case your foot slips). Does issue happen?

If you can re-create this in drive with car stopped, can you re-create this in reverse also? If so, you can do this while car is in reverse with a second person in front of the car to see where noise is coming from. Obviously, they need to plan for sudden reverse acceleration from a safety perspective. Ie. If foot slips and hand is deep in engine bay, they could get seriously hurt... be safe first.
ecbsykes
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Re: woo woo sound between 2100 and 2300 RPM on acceleration

Post by ecbsykes »

Not sure if it's the same, but for as long as I remember in my car (10+ years), I have a bit of a light whining sound (whoooooo) from around 30-40 MPH with a bit of throttle. It's very consistent but it's not been an issue. If this is something that you've noticed has only recently developed and is more pronounced, I'd definitely look into it more.
2000 V70XC - 300,000 miles as of 11 Aug 2020
Hilton Tune, 16T Turbo, Mototec 3" downpipe, Blue injectors, IPD Short Ram Filter, Snabb Intake Piping & RIP kit, do88 Intercooler, TME Dual Exhaust, HID Projectors, R Panels, do88 Silicone Hoses
Goosey
Posts: 10
Joined: Tue Oct 30, 2018 5:19 pm
Year and Model: 1999 V70 XC
Location: North Saanich BC

Re: woo woo sound between 2100 and 2300 RPM on acceleration

Post by Goosey »

Thanks for all the input on this issue. I'm pretty sure it's the turbo since it is engine related, not drive train. I'm going to pull the turbo and redo the gaskets and make sure the diaphragms are in good shape on the controls. Thanks to everyone and I'll let you know how it goes.
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