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Rear Coil Over Conversion.
http://www.ozdat.com.au/forum/viewtopic.php?t=13907		 Page 4 of 6
Author:  dat14u [ Sat Aug 20, 2011 12:52 pm ]
Post subject:  Re: Rear Coil Over Conversion.
WARNING essay ahead....

Can i throw in some thoughts and questions Dat04?
From the sounds of it you havent dont too much drag racing in a 510?
Also have you done much driving in a 510?
Basically these q's lead too what you want out of the car. It sounds like you want to do a bit of draging.
Sure its great to talk about exact spring rates to suit this and that.
But how often do you actually push the limits in these different situations?
Do you want a comprimise spring rate for all or biased towards draging? Or are you happy to spend $150 more and 30mins each time you want to change springs?
I suggest the latter.

Next on the agenda...
I disagree with the numbers Troy has told you.
He is saying 250-275 drag coilover and 200-225 street coilover.
He says it will be drifter style with the 275's in.
By drifter style i assume he means the back will want to step out all the time?????
This makes no sense and is very relative to your front setup.

My experience with standard type rear springs with the 50 odd passes ive done are the tyres are very much the limiting factor.
I am yet to do a pass with drag rubber so cant comment if thats what you are going for.
The softest tallest ie standars 180b or 1600 springs have netted me the best 60' times. This is with camber adjusted for less neg, so the static camber is +ve and sweeps through neutral to neg at launch.

I run 300lb front springs and 1000lb rear for circuit. This gives the best balance for turnin etc track or street, but is very bumby on the street.
When in not circuiting i used to put 700lb rears back in and was a great comprimise on the street.
Now i just leave either the 1000's in if ive been circuiting until i drag it, then i leave stock springs in until i cuircuit it again.
On the street with the stock springs its a bit floaty but i just drive a to b these days and dont really try and hook it in at speed...

With full slicks or decent drag radials i imagine that harder rear springs with static neutral or slight +ve camber would be of benefit at the strip.
On the street if your making 200+rwkw the softer setup will give you more traction for sure.
I did a few tuning pulls the other day in 3rd before Wakefield track day with the stock springs. 2500rpm flat road floor it. Pulled through the boost transition fine.
Then i put the 1000lb springs in and on the same bit of road, same tyres (225/50/15 Kuhmo v700) and it lit the rears consistantly coming onto boost.

Ive got some m/t 225/50/15 radials that will hit the track in the next few weeks and ill be running stock springs, ill keep you posted.
Author:  DATO4 [ Sat Aug 20, 2011 11:06 pm ]
Post subject:  Re: Rear Coil Over Conversion.
- Never done drag work in an IRS rear end,
- This 510 I'm building is my second one, but again no drag work in first 510.
- more than happy to swap springs out at WSID just to race, as its only a 10 min job.
- I intend to push this car fairly hard at the strip only. the FJ will easily pump out 400hp at wheels, and I'm chasing a mid to high ten second time slip.
- I'm only posting up hard on this thread to get advice. the obvious cost setup in changing out springs and shocks continuously until a happy medium is found is not really in my budget. Would rather waffle on and ask a million questions than spend tons of cash in r & d.
- I can't comment on the advice troy gave me. Hes obviously got a lot of experience with 510's, but whether he has good advice with dragging or understands want I want out of my car is open to question.
- I'm only ever planning to run drag radials when going to WSID, so hopefully tyre issues will be limited.

One thing I have learnt so far, thanks to members like you, is how much rear camber (if any) to use. Once I get the spring rate down pat, I think my launches and 60ft times will become a lot quicker.

If you could keep me postsed on how you go with setups, that would be appreciated.
Author:  nismo4 [ Wed Aug 31, 2011 10:07 pm ]
Post subject:  Re: Rear Coil Over Conversion.
Picked up my parcel today from Techno Toy Tuning. Got to say the quality "looks" fantastic. I'll try and get the rear coil overs in this weekend and the bump steer spacers and tension control rods next weekend. I have attached pics below.

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Author:  DATO4 [ Thu Sep 01, 2011 9:34 pm ]
Post subject:  Re: Rear Coil Over Conversion.
i already have T3 castor rods. they look good.
just a suggestion, you may want to consider re powder coating the red bits as the arms will stick out like dog balls when looking front on at the car. i did mine gloss black....

[ img ]

[ img ]
Author:  bad016 [ Thu Sep 01, 2011 10:15 pm ]
Post subject:  Re: Rear Coil Over Conversion.
Hey DATO4, can you tell me are these mods all legal in NSW?? Very horny lookin BTW!!!!!
Author:  travm182 [ Thu Sep 01, 2011 11:35 pm ]
Post subject:  Re: Rear Coil Over Conversion.
DATO4 wrote:
[ img ]
looks like your 1600 is hidden in a batcave or some shiiite haha
Author:  DATO4 [ Fri Sep 02, 2011 7:02 am ]
Post subject:  Re: Rear Coil Over Conversion.
^ LOL. Feels like a bat cave sometimes.
Author:  DATO4 [ Fri Sep 02, 2011 7:09 am ]
Post subject:  Re: Rear Coil Over Conversion.
bad016 wrote:
Hey DATO4, can you tell me are these mods all legal in NSW?? Very horny lookin BTW!!!!!
Thanks mate :thumbsup:
I don't see why it would be illegal? You're not changing the structure or factory design, just like if you bought an adjustable panhard rod or adjustable sway bar kit for a commodore.
They're in there now, they not coming out!
Author:  bad016 [ Fri Sep 02, 2011 8:21 am ]
Post subject:  Re: Rear Coil Over Conversion.
OK, sweet!! Deff looks very niiiice!!
Author:  BenTAxeL [ Fri Sep 02, 2011 2:08 pm ]
Post subject:  Re: Rear Coil Over Conversion.
I need a tissue..... drooling to much
Author:  turbovan [ Fri Sep 02, 2011 4:05 pm ]
Post subject:  Re: Rear Coil Over Conversion.
None of it is legal in NSW without engineer's report on the specific components used including strength testing etc.

Sure you aren't changing the basic suspension design but the components are all manufactured differently. Spherical rod ends like those on the castor rods cannot be engineered at all and are completely illegal for road use.
Author:  bad016 [ Fri Sep 02, 2011 4:13 pm ]
Post subject:  Re: Rear Coil Over Conversion.
Thanx 4 the tip turbovan! Wasnt quite sure??
Author:  DATO4 [ Sat Sep 03, 2011 10:35 pm ]
Post subject:  Re: Rear Coil Over Conversion.
turbovan wrote:
None of it is legal in NSW without engineer's report on the specific components used including strength testing etc.

Sure you aren't changing the basic suspension design but the components are all manufactured differently. Spherical rod ends like those on the castor rods cannot be engineered at all and are completely illegal for road use.
all depends on who engineers your car :giggle:

so really, just engineer and register your car with standard parts, then switch to the goodies.
Author:  82skyblue [ Sat Sep 03, 2011 11:34 pm ]
Post subject:  Re: Rear Coil Over Conversion.
Hi,
I might have missed something but do the rear coil overs mount in the old rear spring position on the arm with a turret fabricated above them in the shell, or do they just mount to the shocky mount locations. Personally I wouldn't like the latter because the standard shock mounts weren't designed to take weight of the rear of the car. Just shocky forces.

Cheers
Kev
Author:  Bozo510 [ Sun Sep 04, 2011 12:03 am ]
Post subject:  Re: Rear Coil Over Conversion.
DATO4 wrote:
turbovan wrote:
None of it is legal in NSW without engineer's report on the specific components used including strength testing etc.

Sure you aren't changing the basic suspension design but the components are all manufactured differently. Spherical rod ends like those on the castor rods cannot be engineered at all and are completely illegal for road use.
all depends on who engineers your car :giggle:

so really, just engineer and register your car with standard parts, then switch to the goodies.
That's fine until you kill someone on the road and they go over your car.
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