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-   -   Rear suspension upgrade advices (http://www.clubcobra.com/forums/era-speak-bob-putnam/144703-rear-suspension-upgrade-advices.html)

CLV8 04-10-2021 07:15 AM
Rear suspension upgrade advices
 
Hello.

Any of you already upgraded rear Jag suspension ?

I'd like single adjustment coil overs but don't know what to choose ? manufacturer ? reference ?

Thanks for your help.

OliveR

strictlypersonl 04-10-2021 07:56 AM
Which rear suspension do you have?

Jag in Jaguar subframe (very early cars).
Jag in tubular ERA subframe?
ERA rear suspension (outboard brakes).

CLV8 04-10-2021 03:00 PM
I have a Jag in Jaguar subframe so early car.

Thanks.

Unique427 04-11-2021 06:57 AM
I have BB Ford with Jag rear very similar to ERA.

Front: (2) QA1 Proma Star DD404 (dual adjust)
Rear: (4) QA1 Proma Star DD403 (dual adjust)

Link to expanded description:
https://www.summitracing.com/parts/qa1-dd403

Spring Rate Front: 350
Spring Rate Rear: 300

Adjustment knobs on bottom so compression/rebound
can be set for conditions on all (6) coilovers in 2 minutes.

Car tracks true and not a harsh ride at all.

Hope this helps a little.

CLV8 04-12-2021 05:18 AM
THANK YOU VERY MUCH for your detailed information UNIQUE427 !!!! :)

I'm going to ordered the reference you sent.

Unique427 04-12-2021 05:46 AM
Quote:
Originally Posted by CLV8 (Post 1491668)
THANK YOU VERY MUCH for your detailed information UNIQUE427 !!!! :)

I'm going to ordered the reference you sent.
Je vous en prie Monsieur.
Bonne chance.

strictlypersonl 04-12-2021 06:53 AM
The stock Jag rear dampers:
13.3" extended
10.3" compressed

The QA1s:
15.0 extended
11.1" compressed
At full droop, you may get universal-joint binding.
You will lose approximately 1.5" of compressed travel from ride height.

If they worked on the Unique, it might be that their top mounts have been raised.

Unique427 04-12-2021 09:48 AM
Quote:
Originally Posted by strictlypersonl (Post 1491672)
The stock Jag rear dampers:
13.3" extended
10.3" compressed

The QA1s:
15.0 extended
11.1" compressed
At full droop, you may get universal-joint binding.
You will lose approximately 1.5" of compressed travel from ride height.

If they worked on the Unique, it might be that their top mounts have been raised.
Would this solve any potential issue?

QA1 DD401 & DD402
14.0" - Extended
10.125" - Compressed

Reference Info here:
https://www.summitracing.com/parts/qa1-dd401

strictlypersonl 04-13-2021 05:46 AM
Quote:
Originally Posted by Unique427 (Post 1491676)
Would this solve any potential issue?

QA1 DD401 & DD402
14.0" - Extended
10.125" - Compressed

Reference Info here:
https://www.summitracing.com/parts/qa1-dd401
Yes. Those seem to be size-compatible.

CLV8 04-13-2021 07:07 AM
Thanks to both of you for your help !!!

EM-0785 04-15-2021 03:36 AM
You mentioned you want single adjustment coilovers. If so, the QA1 part number scheme has the same numeric portion but with the letters DS in front for single-adjustable (DD for double-adjustable).

QA1 tech support can also walk you through the decision point considerations to verify in your application if helpful (measuring, end types, spring length, axle weight, etc.). Best of luck. Brent

CLV8 04-22-2021 12:04 AM
Quote:
Originally Posted by EM-0785 (Post 1491800)
You mentioned you want single adjustment coilovers. If so, the QA1 part number scheme has the same numeric portion but with the letters DS in front for single-adjustable (DD for double-adjustable).

QA1 tech support can also walk you through the decision point considerations to verify in your application if helpful (measuring, end types, spring length, axle weight, etc.). Best of luck. Brent

THANK YOU VERY MUCH FOR THE ADVICE Brent !!!

I've placed my order 2 days ago with Double adjustment QA1.

EM-0785 04-22-2021 12:53 AM
Quote:
Originally Posted by CLV8 (Post 1492111)
THANK YOU VERY MUCH FOR THE ADVICE Brent !!!

I've placed my order 2 days ago with Double adjustment QA1.

You bet! I’m glad to hear your selection and ordering seems to have progressed positively. May your install and tuning/drivability work smoothly as well.

I too have the QA1 double adjustables and have been very pleased with them. Felt like a whole new car.

Best of luck! Brent


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