S12_rb20det_4wd

First of all let me state - I am not a hater. I love that you are putting this much time into an S12.. I just fear you may have bitten off more than is manageable. I have two primary concerns, and they both involve the 4wd system.

Now this is off a gts-4, correct?

The gts-4 and gtr share a common front suspension setup which uses a dual balljoint lower control arm (no bushing on the inner), and an upper control arm connected to a link bracket in the wheel well (dual bushings) - this is to correct caster and camber primarily (works in cooperation with the tension rod). What I am worried about is that you have moved to an S12/S13 variety suspenion  which has only one balljoint, and an inner bushing.

So you chopped off the entire upper arm, and are planning on welding the coilover sleeve body to the side of it.. That is going to take some very thorough thought to get it even close to good enough. And even when it is put together you are likely going to suffer from random caster and camber changes which will make the car almost undriveable - no matter how stiff the front suspension since the play is inherent in the LCA.

My other concern is the Atessa wheel sensor system. From what I recall it distributes torque based on wheel sensor input - though on the gts4 it may have been a driveshaft mounted sensor for the rear wheels and 2 front reluctance/abs sensors on the hubs. Are these sensors being included, and since they are part of the chassis harness how do you plan to integrate them into your s12 harness?

Best of luck.

-Dan

Let me reply for him. :)
As for the front suspension - it's still a draft. Not a final decision.
The Attessa system wont be here - there will be manual 50/50 - 0/100 switch for the first time, and after that he plans to make his own control module, that will distribute torque smoothly when starting.
As for the oil pan - he plans to finish the suspension first. Then he will swap oil pan and attach the drive shafts.

I also do believe that the first ATTESSA generation were using a speed sensor in the diff for the rear wheel...

Why go custom on a awd control system when you already have access to something that works and works good???

stick with the 2 speed sensor in the front hub and get a rear diff on a 240sx with ABS (yes you'll have to mod the mount and the driveshaft since it's a short nose r200, but you've got your rear sensor) and steal an ATTESSA control unit from a r32 and wire those shit on a custom harness (I don't really see the need to incorporate it into the s12 chassis harness) all you have to do is run a high pressure pump (electric or mecanical (lets say hook up an other P/S pump on the engine where the A/C use to sit)) and make it push ATF or power steering fluid (out of a small external reservoir) much like the standard ATTESSA that uses a pump inside the rear diff to provide the tranny with oil pressure to work the clutch that transmit power to the front axle... after this, the ATTESSA control unit will just adjust the amount of pressure that get to the center clutch and control eveything much like it does on any ATTESSA car

Because now all you've done is create a real complicated and real expensive 4x4 car... without a center diff, forget bringing this on dry pavement (ever heard about transmission wind up?), it'll behave like a truck when you've got the center clutch engage and when it's not, you've just got a hell of an heavier and much complicated Collin's car (the way it used to be)... and going custom on the awd control system is still gonna require to get some kind of oil pressure in the tranny to control the torque biais to the rear wheel and then figure out some kind of management for it... which will not be any easier that using what is already used in the r32 IMO

I'm not hating here and I absolutly love the idea, but I just don't think it's been thought through because if you don't solve the awd management, you've got yourself a pretty hard to make rwd car or a 4x4 truck... oh and I don't think he uses a rb20det from a gts4 since the oilpan has no axle going through it on the picture, so it's standard rb20det on a awd tranny...

Anyways, good luck with it

He hasn't had much time lately, but the work continues. The front diff is fitted, plans of how the front suspension will look like is approved, and he's ready to start actually putting things together!
We will keep you posted! :)

sell me your head light gaurds :D

Dang dude, looking good!  And since when does everyone want the headlamp guards? lol  You all know it doesnt protect from anything.

Im watching this, love the idea of an AWD/RWD S12

man that looks like a tricky project. nice.

I like your style un derstand what you are going thru. I'm half way thru fitting a VH41 into an S12 with 4wd, Using R32 crossmembers and a VH41 with a diff in the sump like yours. Couldn't getn the steering to work so had to use Toyota hubs to use McPherson struts and R32 bottom arms.

^^ Do you have a build thread somewhere for this car???

Sorry no thread. I had to put the conversion aside 12mths ago, I will be back on it again next month so will see what In can do.

The daily car

r32_4wd

Seems to be going well. Good job! I think we have the first dual arm suspension on an S12 - you beat me to that one by several years.

This is still awd? How long till the front shaft go in?

that pink is making my eyes bleed holy shit hahahaha

cant wait to see this running!

Looking promising

your car scares me......but i would love to ride it once

dont tell me you want use a civic radiator with an RB^^

Looking good man!

Really glad you guys went the route of switching to double wishbone suspension instead of welding a shock body to the knuckle :)

Looks like its coming together.

Have you considered using a gts-4 or gtr front cross member? It has an allowance for the axles to pass through.

So happy to see this is still progressing!  Thanks for the update.

This car will be incredible when it's finished! It would look perfect with the Gran Prix overfenders with that increased rear axle width

I'm glad, but don't know where to buy

Vovka on 01:02:40 PM / 26-Feb-18I'm glad, but don't know where to buy

I emailed unqshop maybe a month ago for a quote on that kit and they still haven't gotten back to me.

Found the original post:

https://club-s12.org/forum/index.php?topic=16070.0

and in summery try contacting avb sport  instead, but the post was back in 2014.

next ////

amazing, keep it up!

Bless you sir.

Looks like a good print.

The driverside ones are the ones though i think.

Theyre far more delicate and would probably need revised as 3d isnt as strong as the injection they were originally made of.

If i may ask, what printer, and what drawing program are you using?

Im using ender 3 and an older autocad.

s15

Looking really good. You've got skills.

s15

for rb20det

That's an awesome Project.