Home›Forums›Technical – General›Suspension›Modified IRS K-frame for Lowered Cars
This topic contains 92 replies, has 14 voices, and was last updated by [TUFFVQ] 8 years, 4 months ago.
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October 16, 2015 at 12:57 pm #10164
If your handy with the tig. Have you thought about removing the irs completely and fitting a solid vn diff? All problems solved then.
Youd have to change the whole rear floor pan which is a structural part of the car.
November 9, 2015 at 3:39 pm #11066I have modified the camber mounting point, made boxed section and cut the roof out of the standard mount.
Made boxed section with extra hole 20mm higher, I get basically zero camber at a height of 625mm (measuring floor to lip).
Also it’s a good idea to have subframe bushes that are either solid or hard urethane as the top of the box will sit very close to the body.
I also modified the control arm with 4130 chromoly tube arm on the toe section and used a heim joint. Also made coilover bracket for double adjustable Viking/qa1/strange coilovers.
November 9, 2015 at 3:52 pm #11068I have modified the camber mounting point, made boxed section and cut the roof out of the standard mount. Made boxed section with extra hole 20mm higher, I get basically zero camber at a height of 625mm (measuring floor to lip). Also it’s a good idea to have subframe bushes that are either solid or hard urethane as the top of the box will sit very close to the body. I also modified the control arm with 4130 chromoly tube arm on the toe section and used a heim joint. Also made coilover bracket for double adjustable Viking/qa1/strange coilovers.
Very interesting setup! do you have any pics?
November 9, 2015 at 4:10 pm #11071
VRSenator065Participant- Adelaide SA
- VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)
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Posts: 5 777^+1 for pics…
November 10, 2015 at 5:40 pm #11099+2 for pics
November 11, 2015 at 6:15 pm #11132
ImmortalityParticipant- 97 HSV Senator 185i 02 VX L67 Calais
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Posts: 535Definitely require pics
How do you intend to reinforce the original shock mount to take the full weight with the coil-overs fitted?
November 11, 2015 at 6:52 pm #11133
VRSenator065Participant- Adelaide SA
- VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)
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Posts: 5 777I guess you could do some JDM reinforcing cross bracey thing between the towers?
November 11, 2015 at 6:53 pm #11134
VRSenator065Participant- Adelaide SA
- VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)
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Posts: 5 777Thinking about it i guess like IJs Lexcen?
November 11, 2015 at 7:54 pm #11137Thinking about it i guess like IJs Lexcen?
Think it’s more the lower mounts that are in question Gary, I’d given it some thought when I did the IRS conversion in the Tonner but the factory mount is single sided and not really designed to take a spring load..
November 11, 2015 at 8:42 pm #11139
VRSenator065Participant- Adelaide SA
- VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)
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Posts: 5 777I must admit I havent really understood the benefit of going to coil overs on the rear given the work involved. Its the fundamental geometry of the set up thats up the shit really to be brutally honest.
November 11, 2015 at 8:44 pm #11140I must admit I havent really understood the benefit of going to coil overs on the rear given the work involved. Its the fundamental geometry of the set up thats up the shit really to be brutally honest.
Yep Swing Axles are NOT the way to go….
November 11, 2015 at 8:51 pm #11141
VRSenator065Participant- Adelaide SA
- VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)
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Posts: 5 777Especially “semi” trailing ones. I mean rule number 1 of suspension design surely has to be to minimise caster and camber change through travel. And the geniuses at Holden managed to design in both!
November 12, 2015 at 3:35 pm #11183Sorry for the delayed response, but yes Gary that link you posted from Geforce is exactly what I meant.
I’m glad others have done it and as such it gives me the confidence to hack into it and give it a whirl. Thanks very much for following it up.
I have nolathane cradle bushes already so that’s no problem. Think I’ll finally fit a nolathane diff bush as well.
November 12, 2015 at 3:54 pm #11185Would you be so kind as to update us on your progress as I myself am quite interested in this type of thing also with my VP Calais.
November 12, 2015 at 3:59 pm #11187
VRSenator065Participant- Adelaide SA
- VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)
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Posts: 5 777Think I’ll finally fit a nolathane diff bush as well.
Maybe consider the Harrop diff cover, little more diff oil volume and better mount?
November 13, 2015 at 12:35 pm #11243
VRSenator065Participant- Adelaide SA
- VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)
View build HERE
Posts: 5 777November 13, 2015 at 2:57 pm #11250Link?
November 13, 2015 at 3:03 pm #11251
VRSenator065Participant- Adelaide SA
- VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)
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Posts: 5 777November 14, 2015 at 12:20 am #11264So do those control arms actually change the suspension or camber or simply allow more room for a wider tyre?
November 14, 2015 at 1:10 am #11265The Gforce items are designed for more tyre clearance, the suspension geometry remains the same, and the camber would also remain the same. If you were to fit those, you’d also need to weld in the brackets that change the mounting position of the arms to the subframe that Gary has linked above.
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