Steering, Suspension, & Brakes

tips, technology, tools and techniques related to non-driveline mechanical components

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MGBV8
Carl Floyd
Kingsport, TN
(4512 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
IRS Vs Solid Axle
Posted by: MGBV8
Date: May 03, 2023 09:18AM

Interesting...

[grassrootsmotorsports.com]


Airwreckc
Eric Cumming
RTP, North Carolina
(249 posts)

Registered:
05/28/2020 10:10AM

Main British Car:
1972 MGB-GT (working on a Sebring project) Buick 300-4 V8

Re: IRS Vs Solid Axle
Posted by: Airwreckc
Date: May 03, 2023 12:48PM

Good to know--makes me feel better about using my Ford 8". Thanks for posting, Carl.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6470 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: IRS Vs Solid Axle
Posted by: BlownMGB-V8
Date: May 04, 2023 07:25AM

Depends on what you are after. generally the solid axle will be better for straight line acceleration and the IRS will be better on uneven or rough road surfaces.

Jim


MGBV8
Carl Floyd
Kingsport, TN
(4512 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: IRS Vs Solid Axle
Posted by: MGBV8
Date: May 04, 2023 10:14AM

I agree with the author. I do not believe that the IRS is superior on a road course.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6470 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: IRS Vs Solid Axle
Posted by: BlownMGB-V8
Date: May 04, 2023 04:18PM

I guess it depends...

Jim


ag1234
Arthur Gertz

(66 posts)

Registered:
03/29/2023 08:26PM

Main British Car:


Re: IRS Vs Solid Axle
Posted by: ag1234
Date: September 03, 2023 12:01PM

So , are most of us, using our cars primarily for road courses ? Sounds like roads in many states are becoming 1,5 caca ? How do you get a good camber curve on a solid axle ?
Art.


MGBV8
Carl Floyd
Kingsport, TN
(4512 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: IRS Vs Solid Axle
Posted by: MGBV8
Date: September 04, 2023 09:39AM

Street cars will have compromises & with IRS squat & dive things are constantly changing. I am certain that designing a good IRS is a giant PITA.

On the other hand my B has little body roll & not that much suspension travel. So, the camber gain is not much of an issue. I prefer the simplicity of the live axle.



BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6470 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: IRS Vs Solid Axle
Posted by: BlownMGB-V8
Date: September 05, 2023 07:38AM

Certainly a live axle is much less expensive and much simpler to implement than a well designed IRS, and one that squats on launch is not that well designed. Squatting means that the axle is lifted, a thing that does not contribute to maintaining tire contact. Drag racers lift the rear on launch to put more initial pressure on the tire patch, but much more commonly body height is unchanged. The TR4/6 is a notable exception.

IF the IRS is restricted in travel as the stock axle sometimes is with lowered ride height, stiff springs and shocks there may not be much of a noticeable improvement. However if the install is done in such a way to take advantage of what the IRS has to offer the results can be significant. It may take some time to tune the suspension and achieve these results.

I feel I have accomplished this now with the MG-Roadmaster and my roadster using the narrowed Jag IRS and the widened bodywork.

Carl will be driving the RM this coming weekend to attend the GCBCC show and will have the opportunity to evaluate all aspects of the car including the handling and I look forward to his feedback. The car is not fitted with sticky tires like his so it won't be any sort of direct comparison but it should be interesting nonetheless. I do have a couple of twisty local roads I can show him.

Jim


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