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I have a GH Sigma Sedan and have been looking at a few Rear Suspension upgrade options , ive settled for Datsun 620 Diff with a 4.1 welded center,

I noticed the GE Wagons have its shock mounted Slanted and away from the Wheel Hatch , making It very easy to fit some Broad tyres other than the Sedans which shock mount inside the wheel hatch.

When i Measured the GH wheel hatch width, its Aproximately 14'' wide , but the Bracket structure for the shock is about 2'' leaving you with 12'', what if i can relocate the shocks and Eliminate that shock mount , will this affect how the shock works on this car or it will be fine?


should I just relocate the shocks or do a full Coilover system and fabb some tunnels for them to bolt up, if so whats the Spring rate for stock gh rear springs?

The Car is Going to be Street driven but weekend dragster

Thanks alot Steffan

FUGITIVES wrote:Hey guys I have a GH Sigma Sedan and have been looking at a few Rear Suspension upgrade options ,Ive thought of independent but over too much work , ive settled for Datsun 620 Diff with a 4.1 welded center,

Thanks alot Steffan

? what is the upgrade to do - and what is the 620 diff ( H190 ) if it is the datson bluebird housing takes the H190 diff from a range of datsons and is only 40 mm wider than a sigma
I use one my self I have 2 centres a 3.89 and a 4.11 both have had the CIG treatment
most of the time the 3.89 is used

I also machined the outside flange down so starion discs would slide onto them and welded brackets on the housing to take the calipers
by the way I have a jig for welding the mounting bracket in the correct positions

something I havn't done but still intend doing is to make some adjustable spring platforms
but keeping the spring in the std position ( as per IPRA class rules )
the other thing that I have made up but not used as yet are a set of KONI adjustable shocks
from a set of holden rear KONIs but with mounts on top to suit the sigma

Nice cheater parts, My sigma will be powered by an SR20VE-T Engine , s13 sr20det bottom end with a sr20ve neo vvl head , most guys use sr20dets in GSR Box Lancers and Datsuns down here in Trinidad ,
but I choose the Mitsubishi Sigma GH as my project car because parts are soo cheap and available for them, and they look nicer than the GJ's
Luckily the Sigma has a HUGE wheel hatch , about 31'' in length and 14'' Wide, so what i wanna do is get the shock to bolt somewhere other than where it is originally bolted and Grind off that shock Bracket to get as much room as possible to get some BIG tyres in there,

but i need to see how/where the GE wagons shocks bolt on the inside and if possible fabricate it to work just like it.

Opinions anyone?

Even if my question is dumb say so , Bet if it was one of the Popular guys here it would have reached Page 2 already

You want the shocks to be vertical, any angle on them will reduce the effectiveness.

It's a standard principle in radio control car racing. Laying the shock at an angle will make it softer. The more the angle the softer it will be. The other thing that affects softness is position. The further out towards the hub the more effective (or stiffer) the shock, the further away from the hub the less effective (or softer) the shock.
If you want to lay the top of the shock in away from the hub, you'd need to move the base towards the hub to counter act what you've done.
Or just fit a heavier shock after you do it.

Does that make any sense?

FUGITIVES wrote:Even if my question is dumb say so , Bet if it was one of the Popular guys here it would have reached Page 2 already

Dont be offended Fugative, it is just an unusal suggestion...


Im not really up on the Sigmas.

But what you are asking is, the Sigma Wagon has a Rear shock, upper mount that sits further toward the centre of the car, than the Sedan does..

And you are asking can you use the Wagon Shock mount section to use, so that it Brings the Top of the Shock over 2 inches to allow for wider tyres..

Correct?


Ok a couple of questions to get things rolling...

How large a Tyre are you wanting to run?
How wide a tyre/rim are you wanting to run?


What are the Police like in Trinidad?
Will you get into trouble for illegal Modifications to your car?
Or will you get the Suspension mods Engineered?


How handy are you on the tools?
Will you be doing the modifications yourself?



Why cant you just bolt on a set of rims that stick out of the gaurds when you get to the track?


As much info you can give might help mate

Cheers Dan

Thanks for the Assistance guys , you have time on your hands now as its Holidays Ehhh lol

Dan Turbo Lancer, The police wont harass me about that , I will let a Good Knowledgable Suspension Fab guy do the Brackets , That 2'' of bracket will make a hell of alot of Slick Space when removed ,

I wanna make sure traction is not an Issue here because its some good power (500-600) is my Goal on a SR20VE-T RWD.

About the shock angle , the same angle it has Stock (Kinda leaning forward, Lets say North) will be now tilted Side ways Like EastWards , there wont be no big change in the angle and also I will be Using some Rancho 9 way adjustable Shocks http://www.summitracing.com/parts/RAN-R ... mage=large,


so i guess the issue of it being Softer when tilted can be resolved with an Adjustable Shock

500 to 600 hundred what, Horsepower???

Why the hell are you worried about cutting and welding in another shock tower??

You will have to do a full Tub and Ladder bar suspension set up!

Goto a Chassis builder!

Doubt a Datsun diff will cope either...



We do have some dreamers amongst us... lol

He may only be talking Kilowatts Dan.
But still that is alot. A mate of mine has spent some serious money on his Datsun 1600, he's got an SR20 in it with bigger turbo, injectors and aftermarket EFI (don't ask me what else I don't know), but it puts out 242Kw's at the back wheels.
He took me for a drive in it once, I just about had to scrape the S--t out of my undies...
I'm trying to imagine twice that , No, sorry can't do it.

The good old Nissan H190 diff has been used in many drag cars, heaps of cars running 9's and a few with 8's. Common in 720 utes and Series 3 bluebird's here (amongst other stuff)

You do realise a kilowatt is more then a horsepower...??

Softening up is not the only downside, it also leads to binding of the suspension and shocks as they try to move down. You really want to have them vertical. Making new mounts for them should not be that difficult when you are putting in the new diff.

HoonBoy wrote:You do realise a kilowatt is more then a horsepower...??

Well that just proves something about me. I don't care about power. I knew they were different, just got them mixed up

FUGITIVES wrote:When i Measured the GH wheel hatch width, its Aproximately 14'' wide , but the Bracket structure for the shock is about 2'' leaving you with 12'', what if i can relocate the shocks and Eliminate that shock mount , will this affect how the shock works on this car or it will be fine?

How wide do you want your rims to be 10 inches or bigger?

FUGITIVES wrote:Even if my question is dumb say so , Bet if it was one of the Popular guys here it would have reached Page 2 already

I only just saw this comment on re-reading your posts. But it's not always true. Some of the things that I thought would get comments, no-one has really said anything and things that I thought no-one would really comment on, they have. So it's pot luck sometimes. It might also be that you haven't made many comments on other peoples posts.

I'm not going to suggest your question is dumb. It just puzzles me why you want to go to so much trouble to gain so much room?

DanTurboLancer wrote:500 to 600 hundred what, Horsepower???

Why the hell are you worried about cutting and welding in another shock tower??

You will have to do a full Tub and Ladder bar suspension set up!

Goto a Chassis builder!

Doubt a Datsun diff will cope either...



We do have some dreamers amongst us... lol

Well its Dreams that actually make ppl get up, go for it and live it,

I observe alot of people down here fighting to get their car (not necessarily Sigma's) stable and run straight as they go up in power, but their vehicles (rx2's, Lancers, all Datsuns powered by sr20det's/CA18det's with datsun strictly datsun H190 Diffs) cant take the Size Slicks needed for the power they are making because its stock wheel hatch,

my buddys gonna do some opening in the wheel hatch to make 26x8x15 work in his series 4 RX2, im sure he will need bigger than this for what power he wants to put

Thats why im glad i choose the Sigma , just that Bracket thing is in the way and you have 14'' x 31'' of Hatch to play with, a Grinder and Torch and that ***** is out , Heres a little quick Sketch I made,

Heres the Shock
Heres The Car

EDIT

If you are serious, you need to spend serious money!
And get someone to set you up with a proper drag chassis, suspension and diff combo...


If you want to have fun, just get the strongest diff you can and slap on the widest rims and tyres, and see what you can get.



And remember, the most horsepower doesnt always get you the fastest times!

Just a Bump , whats the Spring rate for Stock GH Rear Springs, saw a rear coil over kit and i might give them a try , here it is http://www.summitracing.com/parts/CMB-15-0014/?rtype=10