Fan relay buzzing when accelerating past "max vehicle speed"

s300 and SManager software questions & answers
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2x0
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Fan relay buzzing when accelerating past "max vehicle speed"

Post by 2x0 » Mon Jun 18, 2018 11:04 am

I am controlling the radiator fan thru Hondata which is working great. However I have the maximum vehicle speed set to 158mph because when I set it at a normal speed like 35mph, if the fan is on and I accelerate past 35mph the fan relay clicks on and off very quickly creating a "buzzing" sound while I am within 1-2mph of that speed.

This is a '91 CRX with cable driven speedo and my VSS signal is very jumpy, which I think might be the cause. Anyway to buffer the signal from the ecu so that it has time delay or something and will not cause this issue?
'91 CRX, B18c1, T3/T4, 17psi on e85, FIC 1000cc's, S300 V3 P28

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Spunkster
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Re: Fan relay buzzing when accelerating past "max vehicle speed"

Post by Spunkster » Mon Jun 18, 2018 11:58 am

There is no way to buffer that. You need to resolve the issue with the speed sensor sending a jumpy signal.

2x0
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Re: Fan relay buzzing when accelerating past "max vehicle speed"

Post by 2x0 » Tue Jun 19, 2018 10:11 am

Spunkster wrote:
Mon Jun 18, 2018 11:58 am
There is no way to buffer that. You need to resolve the issue with the speed sensor sending a jumpy signal.
Okay I will look into that. For the time being do you know if it could damage the relay running it this way?

Thanks
'91 CRX, B18c1, T3/T4, 17psi on e85, FIC 1000cc's, S300 V3 P28

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Spunkster
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Re: Fan relay buzzing when accelerating past "max vehicle speed"

Post by Spunkster » Tue Jun 19, 2018 11:51 am

Its probably not good for it.

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