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Aug 11, 2010 13:34:53 GMT
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How do??
anyone got any idea how to lower me Vauxhall PA Cresta "Double Wishbone Suspension" uber low without effecting the geometry to much??
I'm looking to lower it about 4 inches but don't wana just cut the springs!!
ive thought about lowering the stub axle/spindles aswell as lowering springs...but worried about welding and fatigues!!
Any ideas on dropped spindles that may work??
Cheers
Greg
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Aug 11, 2010 13:38:25 GMT
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you cant lower it without effecting its geometry unless you rebuild the whole lot, even dropped spindles alter things.
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Volvo back as my main squeeze, more boost and some interior goodies on the way.
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Tim
Posted a lot
Posts: 3,340
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Aug 11, 2010 14:57:39 GMT
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move the floor pan up within the body?
i remember reading about a mk1 cortina that ha been IRS'd and had been lowered by dropping the body around the floor pan to maintian good suspension geometry
lot of work though, unless its really rusty :-)
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Last Edit: Aug 11, 2010 16:51:19 GMT by Tim
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Aug 11, 2010 15:07:01 GMT
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Got any pictures of the suspension? What can be done will be limited by the design. I doubt very much if you'll get that much drop without some changes to geometry, although any compromises needed may well not be noticable.
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Last Edit: Aug 11, 2010 15:07:20 GMT by Ratdat
1962 Datsun Bluebird Estate - 1971 Datsun 510 SSS - 1976 Datsun 710 SSS - 1981 Dodge van - 1985 Nissan Cherry Europe GTi - 1988 Nissan Prairie - 1990 Hyundai Pony Pickup - 1992 Mazda MX5
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Aug 11, 2010 15:13:11 GMT
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Got any pictures of the suspension? What can be done will be limited by the design. I doubt very much if you'll get that much drop without some changes to geometry, although any compromises needed may well not be noticable. These are the best shots i have:     |
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Aug 11, 2010 15:14:14 GMT
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I know what I'm gona do with the Rear (ello sailer!!), just the front I'm worried about??!!
Greg
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Aug 11, 2010 15:25:21 GMT
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Are the spindles one piece with the uprights or do they bolt on? If they are one piece, I don't think I'd entertain the idea of chopping and welding up your own dropped spindles. If they are sperate you can make drop plates to do it though.
It looks like there's plenty of travel in that suspension so you probably could get most of your drop with shorter springs and shocks but you might be able to achieve part of the drop with shortened springs and the rest by either dropping the spring down into the lower arm by fabricating a cup fit it to sit in or possibly but spacing the qouter ball joint up from the wishbone. From the pics it doesn't look like the ball joint has a bolt on mounting though.
As there's quite a bit of difference in the upper and lower wishbone lengths, I reckon you might get a fair bit of neg camber if dropped a long way.
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1962 Datsun Bluebird Estate - 1971 Datsun 510 SSS - 1976 Datsun 710 SSS - 1981 Dodge van - 1985 Nissan Cherry Europe GTi - 1988 Nissan Prairie - 1990 Hyundai Pony Pickup - 1992 Mazda MX5
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kee
Posted a lot
Posts: 4,991
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Aug 11, 2010 15:25:56 GMT
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you could raise the mounting points of the lower arms with a subframe that mounts on the original mounts, and modify the arms to fit. use in conjunction with lowering springs too, although the top arm will be at a funny angle.
would you be able to raise the mounting point of the crossmember itself?
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Aug 11, 2010 15:52:18 GMT
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Are the spindles one piece with the uprights or do they bolt on? If they are one piece, I don't think I'd entertain the idea of chopping and welding up your own dropped spindles. If they are sperate you can make drop plates to do it though. It looks like there's plenty of travel in that suspension so you probably could get most of your drop with shorter springs and shocks but you might be able to achieve part of the drop with shortened springs and the rest by either dropping the spring down into the lower arm by fabricating a cup fit it to sit in or possibly but spacing the qouter ball joint up from the wishbone. From the pics it doesn't look like the ball joint has a bolt on mounting though. As there's quite a bit of difference in the upper and lower wishbone lengths, I reckon you might get a fair bit of neg camber if dropped a long way. The spindles are bolted on top and bottom to ball joints attached to the a-arms, they kinda look like these but PA:  |
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Aug 11, 2010 15:59:52 GMT
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you could raise the mounting points of the lower arms with a subframe that mounts on the original mounts, and modify the arms to fit. use in conjunction with lowering springs too, although the top arm will be at a funny angle. would you be able to raise the mounting point of the crossmember itself? I think i know what you mean?? The inner pivot point of the lower arms, raise the mounting holes further up the Crossmember?? and the only way i can think that i could raise the member itself would be to cut off the 4 crossmember mounting cups, that attach to the body, cut the 4 mounting arms down and weld the 4 cups back on so the attach to the body correctly again??!! |
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Aug 11, 2010 16:00:29 GMT
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I figured they would be one piece.
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1962 Datsun Bluebird Estate - 1971 Datsun 510 SSS - 1976 Datsun 710 SSS - 1981 Dodge van - 1985 Nissan Cherry Europe GTi - 1988 Nissan Prairie - 1990 Hyundai Pony Pickup - 1992 Mazda MX5
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Aug 11, 2010 16:08:44 GMT
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Raising the crossmember might give issues with sump clearance unless you chop the centre out of the crossmember and alter it. It would be the best way to drop it a long way though.
Personally, I'd get the suspension installed minus springs and shocks then lower it on a jack to the ride height you want and see how the arms sit. You might find it's not going to be as much of a challenge as you think.
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1962 Datsun Bluebird Estate - 1971 Datsun 510 SSS - 1976 Datsun 710 SSS - 1981 Dodge van - 1985 Nissan Cherry Europe GTi - 1988 Nissan Prairie - 1990 Hyundai Pony Pickup - 1992 Mazda MX5
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Aug 11, 2010 16:36:21 GMT
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Nice one!!  |
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Aug 11, 2010 16:45:13 GMT
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Hey RB your avatar made me LOL, whats it all about?
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1974 Lancia Beta Saloon
1975 Mazda 929 Coupé
1986 Mazda 929 Wagon
1979 Mazda 929 Hardtop
1982 Fiat Argenta 2.0 iniezione elettronica
1977 Toyota Carina TA14
1989 Subaru 1800 Wagon
1982 Hyundai Pony 1200TL 2-dr
1985 Hyundai Pony 1200 GL
1986 Maserati 425 Biturbo
1992 Rover 214 SEi 5-dr
2000 Rover 45 V6 Club
1994 Peugeot 205 'Junior' Diesel
1988 Volvo 760 Turbodiesel Saloon
1992 Talbot Express Autosleeper Rambler
2003 Renault Laguna SPEARS OR REAPERS
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Aug 11, 2010 18:59:31 GMT
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Hey RB your avatar made me LOL, whats it all about? I'm in to rock n roll 50s shizzle and we dance a Bop to certain music... I'm well renowned for Bopping but i cant help but dance like a chained up russian bear...so it stuck!! lol I thought id share a few holiday snaps for you: Ice Hockey!!  And at home at the circus:  ;D |
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Oct 27, 2010 11:27:58 GMT
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you could raise the mounting points of the lower arms with a subframe that mounts on the original mounts, and modify the arms to fit. use in conjunction with lowering springs too, although the top arm will be at a funny angle. would you be able to raise the mounting point of the crossmember itself? Following on from my previous post, i have had a few more thoughts on how to lower the PA Cresta which maybe right or completely wrong... The main thing is, certain techniques ive seen used have been utilised on body off, work on frame/chassis not of a monocoque nature??!! i'll put them to you guys and see what you think?? Firstly this front clip... ...mounts to existing chassis rails in 4 places like so:   can i do this, Z the chassis rail at each of the 4 mounting points like so...  ...to allow the front clip to sit higher in the body thus lowering the front...or am i like Don Woody said, "Barking up the wrong tree" The only other thing ive thought about is to cut, shorten and re-gusset the actual mounts on the front clip unit?? I know this all sounds, maybe over technical, i have been told in the passed that i over complicate things but i don't just want to cut springs down and bump stops making the car handle like a river of jellied eels!!! |
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Oct 27, 2010 11:49:15 GMT
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that would work fine as you would effectivly be sectioning the body down instead of lowering the car . end result lower car full suspension  |
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Oct 27, 2010 11:55:15 GMT
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But makes you liable for BIVA i think, altering the suspension mounting points.
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Volvo back as my main squeeze, more boost and some interior goodies on the way.
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Oct 27, 2010 11:56:30 GMT
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Cutting the chassis will, of course land you in BIVA territory IF/WHEN caught . Meanwhile the biggest issue chopping coils excessively etc will be the angles the ball joints have to work at. This can mean failure of the joint or , as in the case of a friend with a PB ,all the loads being transferred to the inner mount of the upper arm eventually causing the are around the welds , not the welds themselves to split allowing the suspension to collapse. You could replace the entire front with a purpose made crossmember and arms which means for the 8 points rule you would have to retain original engine and box to have enough points to stay away from BIVA . Accepting less drop may save you a world of work  |
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Last Edit: Oct 27, 2010 14:31:01 GMT by kapri
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Oct 27, 2010 11:59:04 GMT
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that would work fine as you would effectivly be sectioning the body down instead of lowering the car . end result lower car full suspension I'm glad to hear that...Phew!! My Main worry was in doing so, affecting the strength of the rails as the Front clip would bolt and mount through the rail!! I didnt want it to rip apart!! |
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