CDR

I apoligise if this issue has been covered before however my browser is not playing ball with the forum search function so if anybody can point me in the direction of previous threads on this issue that would be great.

Query is as the title suggests. Am considering installing a jap spec sti v7 gearbox with DCCD into my MY99. As far as I can gather I will need the box, tailshaft, rear diff, axles and hubs and the heavier duty front driveshafts as a bonus. (I believe these aren't necesary but are a stronger unit than standard.) Regards the DCCD I need the control ****, wiring harness and the control box. Any thing I have missed?? Any pitfalls on the install?? Any feedback very much appreciated.

Andy.F

You will find some info here http://www.scoobynet.co.uk/bbs/threa...hreadid=181119
beware it's a long thread !! I recall some issue with the starter motor being different ??

Andy

David_Wallis

mail me if you want my phone number, it may be easier..

I have a Sti7 Uk box in my 94..

David

greasemonkey

Does the JDM STi7 box have the auto-DCCD function? If not, your parts list should be about right. You can probably get away without changing the driveshafts and hubs, and possibly even the propshaft.

You'd need to do something with the instrument panel though if you wanted the telltale LED's in their proper locations. The MY99 instruments have the requisite holes in the base moulding, along with the connection tracks on the circuit board, but you'd have to do your own wiring to integrate that with the MY01 controller, as well as cut the slot in the fascia panel, and sort the display cover.

Installing the mechanical bits shouldn't be problematic. As you already know, David has put a six speeder in, and so have a couple of others, so no real pitfalls there.

However, integrating the electronics may be more of a problem, becoming a bigger one if the box does have the auto diff control. This has steering angle, braking force, and sundry other sensor inputs, many of whom will presumably be external, so you'll need to replicate them. It's also linked to the engine ECU, and here you could be in trouble as the MY99 and MY01-03 ECU's come from different manufacturers.

Would be great if it worked though, good luck if you go for it!

Have you looked on the American boards to see if any of them have done the same swap?


[Edited by greasemonkey - 8/26/2003 2:06:24 AM]

CDR

Thanks for the feedback guys, as far as I know the JDM box has the manual control **** for the adjustment of the DCCD. Not sure of the auto function. (ie. have not heard of it but no doubt will when I get through the thread above) Is this an automatic override function of the DCCD control or a DCCD system requiring no driver input (Hmm let me think about that...kind of defeats the purpose huh)I am confident now that the mechanical side is reasonably straighforward. Am hoping to get the extra bits (rear diff, axles and the front driveshafts, rear driveshaft) although not required, to gain the extra strength.

I figure it is the DCCD that is going to bring me unstuck. Do run an after market ECU (autronic) so if it isn't a stand alone system I can see that I might be opening a huge can of worms. Will keep digging and keep you posted.

CDR

Re the american boards, those poor buggers have really only just got rexes over there so anything pre 01 seems to be out of their league. It seems to be a popular swap over there into their newer models(the box anyway) but not getting any solid info on the DCCD component. Thanks again.

mutant_matt

The "old" DCCD did not have the auto function so shouldn't be too hard to reto fit and has some (IIRC reasonably simple electronics to go with it). The "new" DCCD-A as fitting to the JDM STi 8 as the name suggests, has an auto mode which would probably be much harder to fit due to the much more complex electronics which go with it (and probably rely on the ECU too).

Cheers,

Matt

David_Wallis

I also have autronics.. and fancy dccd

Speak to Town end / gems? about their auto / electronic diff controller

Lone Ranger

You may wish to consider if you will get any real advantage from six ratios instead of five. Look at the ratios of both the five speed and the six. First gear on the six speed on my new car is so low it is of little use other than to get you rolling. If I was buying one of these new again then I would go for a five speed if it was an option, which it is not.

mutant_matt

Except that the 6 speed is supposed to be a lot stronger. Having said that, if you are going for strength, you'd probably go for one of the Lateral Performance PAR sets which seem to be pretty strong!

I personally like the 6 speed box and would have one over the 5 speed by choice!

Matt

CDR

Well Here is the latest I have got. It is from a guy in the US. Rather than type it, here is a cut and paste........ (Rallispec in the US)

"The manual DCCD system which has been used on various STi type R, RA, and Spec C models from '96 to the present is entirely self contained, in that it does not require inputs from the ECU, ABS, or other systems. However, MY03 STi and STi Spec C models in Japan (as well as our MY04 STi in US) are available with an automatic DCCD system that takes inputs from the ECU and the ABS to provide the optimum setting for the conditions.

Obviously retrofitting of the auto DCCD system would be quite complex and is not recommended. However, retrofitting the manual DCCD system is relatively straight forward. In addition to the DCCD itself you will need the thumbwheel switch, control unit, and wiring harness. On the first models available with the DCCD in Japan, the system was added off the production line and therefore the wiring harness was entirely separate from the main harness. This is the harness we offer to our customers. I can mark each connector to indicate where it should go or how it should be attached to the car. I can also tell you where the control unit should mount (the mounting holes are in all GC Impreza chassis so it is bolt-in). There is no additional components would be required.

I should also mention that the wiring harness is no longer in production and therefore once all stock is depleted will be obsolete. When that happens the only option will be to purchase the entire bulkhead harness which will substantially increase the price and complexity."


So from that it would seem that the JDM V7 STI box with DCCD would be a goer. The V8 STI with auto DCCD would be a problem. At this point I should mention I am in Australia, so some of the products mentioned above I am unfamiliar with.

Re the 5 v 6 speed debate. I am looking at a type R 99 5 speed with DCCD as an alternative. However as pointed out, while you get some good ratios, you get a box without the strength of the 6MT and you don't get the R180 diff (if you are getting this with the 6 speed package) which I am told is very useful if you are planning to use the DCCD as the rear diff cops alot more stress. (Also 6MT package has stronger uni jointed prop shaft)