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Protech Springs 
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Part built GTM

Joined: Tue Mar 24, 2020 12:20 am
Posts: 71
Post Protech Springs
I'm thinking of getting a set of Protechs for my V6 Libra.
Any idea of recommended spring rates?
It's a road car and not going to be used on the track so I'd like a bit of comfort as well as handling.
My car has anti roll bars front and rear and is running on 17 wheels.
Thanks.


Mon Jan 18, 2021 10:41 am
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On the Road

Joined: Wed Aug 11, 2010 9:27 am
Posts: 541
Location: Sheffield
GTM: Libra
Post Re: Protech Springs
The protechs come with springs with a reasonable roadworthy spring rate.

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2000 GTM Libra 1.8VVC 145BHP


Mon Jan 18, 2021 12:48 pm
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Part built GTM

Joined: Tue Mar 24, 2020 12:20 am
Posts: 71
Post Re: Protech Springs
Do you know what they are, I just spoke to Protech and they didn’t seem sure.


Mon Jan 18, 2021 1:11 pm
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On the Road

Joined: Wed Aug 11, 2010 9:27 am
Posts: 541
Location: Sheffield
GTM: Libra
Post Re: Protech Springs
250lb front, 300 lb rear sez on their website.

I have protech fronts with 250 (no ARB) and am happy on the road.

I have AVO with 300 springs on rear now, I will buy a set of protech rear eventually, when i can afford to.

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2000 GTM Libra 1.8VVC 145BHP


Mon Jan 18, 2021 2:09 pm
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Part built GTM

Joined: Tue Mar 24, 2020 12:20 am
Posts: 71
Post Re: Protech Springs
Brilliant, thanks.


Mon Jan 18, 2021 2:17 pm
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Joined: Sun Oct 19, 2014 10:10 pm
Posts: 964
Location: Bristol
GTM: Spyder
Post Re: Protech Springs
300 rear seems a bit soft to me. Mine are 425 and aren't overly stiff, I'd say about right.


Mon Jan 18, 2021 4:09 pm
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Part built GTM

Joined: Tue Mar 24, 2020 12:20 am
Posts: 71
Post Re: Protech Springs
That sounds about right, the current GAZ springs are 9” 450lb.


Mon Jan 18, 2021 11:47 pm
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On the Road

Joined: Wed Aug 11, 2010 9:27 am
Posts: 541
Location: Sheffield
GTM: Libra
Post Re: Protech Springs
I just checked, i def have 10in FL x 1.9in ID x 300lbs/in rate on my rear Avos. Never really found em to be too soft I don't think..

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2000 GTM Libra 1.8VVC 145BHP


Tue Jan 19, 2021 12:31 pm
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Part built GTM

Joined: Sat Oct 22, 2016 12:41 am
Posts: 106
Location: Brisbane Australia
GTM: Spyder
Post Re: Protech Springs
Protech website says shocks come with 250 front and 300 rear.
https://www.protechshocks.co.uk/protech-shocks-gtm-libra-front-and-rears/


Wed Jan 20, 2021 10:46 pm
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Ready for SVA
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Joined: Sat Feb 14, 2009 6:06 pm
Posts: 379
Post Re: Protech Springs
Back in the day front were 250 rear 450

Later when RDM were making them the spring rates dropped quite a bit.

Some years ago Bob Snooks I think along with another member did all the sums to work out wheel frequency etc and came up with some answers. There is a topic on it somehwere.

I tried the lower rates and found the ride very compliant but too much roll and too soft for me.

I tried lots of different combinations and ended up back with 250 450. I also had anti roll bars.


Fri Jan 22, 2021 4:45 pm
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