Chi-Town

Ok these are the connectors I'm stuck on. The one is near the ECU and the other are behind the air box. Anyone pin these out before? Thanks!

I said in the post that it wasn't financially reasonable for most people but there are those people with deep pockets (not me!🤣)

Thank you sir!

Let's do the math. QRT-C seat 6.4kg Side mount 1.45kg Recaro fixed base 2.26kg 10.11kg total My stock power driver's seat that I weighed today 17.8kg I was simply trying to show there is a decent amount of weight to be shed if you have the cash and time. The weight will vary depending on the components you use as would be expected. Take it as you will.

@Duncan thanks for the reply. That was my original plan, use the 260RS engine harness (I have all 3 pieces) and sort out the interior plugs. What I ran into that worried me was the 2 plugs behind the LH headlight that aren't on the 260RS harness. They have some heavy gauge wire in them. I noticed the R33 GTR harness has them though? Do you have a copy of the 33 manual in English? I have the front end/ fuse box harness from the 260 also if I need to go that far.

Calm down, they were all rough numbers, but just showing possibilities of where to take out a good amount of weight. Here are some actual examples. If you take it both 15-20kg front seats and replaced them with fixed position 6-8kg ultra light carbon Recaro QRT-C A 4kg LiPo battery vs a 18-20kg lead acid Pretty sure I can cut 10kg off the front and rear beam RS4 beams combined. A Volk CE28N (or lighter) with a lighter tire vs the heavy stock wheels and tires, pretty sure between a set of 4 you'll save 2-4kg each. That's rotational mass so even better. 4 Stock rotors vs Project Mu SCR-Pro 2 piece front and rear, pretty sure they save close to if not more than 1kg each, so all together roughly 5-7kg. And again that's rotational mass so even better. HICAS rack weight I guessed on, but still heavier than a Midori Seibi or Cusco HICAS delete. Aluminum or chromoly links will weigh less than the factory stamped steel links and cast front lower arms. Depending on brand, bushing type, and other variables I figured between 8 arms and links you could squeak out 5kg but possibly a tad optimistic. Factory prop shaft 13.7kg vs carbon shaft 6kg (sorry, not quite my estimated numbers) Stock suspension roughly 7kg per corner vs my Flag-L at 5kg, so 8kg for the set of 4. Billet RB block is quoted as 46kg vs stock at 70kg. 34kg savings. Sorry a bit optimistic on this one also but cut down the crank counter weights and run some Ti rods and you'll lose the other 4kg 😄 I forgot these: Full Titanium exhaust vs stock steel piping Titanium or aluminum IC piping vs stock. 300M CV shafts (gun drilled of course) Ceramic CV balls Take out the floor mats Go on a diet Now I'm not saying any of this is budget friendly (or even close) but it's all possible without driving around in an stripped bare empty tin can.

Sorry about the repost but I figured this title was more accurate. I've searched a bunch but haven't found the info I'm looking for so I'm starting this thread. Is there a post or diagram showing the wiring changes needed to put a RB26 in a S1 RS4 Stagea? (please provide link or file) Is there a post or diagram showing how to use a factory S1 260RS engine harness in an S1 RS4 Stagea? (please provide link or file) Does someone make an ECU adapter harness so go from S1 RB25DET to RB26DET? Information I can share so far: Factory 260RS harness is similar to the RSV harness but is missing the Black and White connectors behind the LH headlight and the wiring is different at the connectors near the ECU. RSV harness lacks the wiring / connections for the following: Second O2 sensor Second MAF wiring Intake decel valve Any help is always appreciated!

Plenty of ways to cut weight in a C34 depending on how deep your pockets are. Swap the front seats out with ultra light carbon buckets = ~ 20-30kg (depending on seats chosen) Swap out the full size battery for a LiPo4 unit = ~20-30kg (depending on battery chosen) Cut down the front and rear crash beams = ~ 10kg (roughly) Light weight wheels and tires = ~10-20kg (depending on wheel and tire chosen) 2 piece front and rear rotors = ~ 5-7kg Remove HICAS = ~ 5kg Lightweight suspension links =~5kg Carbon prop shaft = ~10-15kg Light weight coil overs =~5-10kg Billet engine block =`40kg 😅 Considering the car is just slightly heavier that a R33 GT-R but has a better weight distribution I would concentrate on the quality of the handling and adding a bit more power.

So I have my stock 97' S1 RB25DET/auto harness and a 97' 260RS engine harness and ECU. I've noticed a few differences in them where they connect to the car itself. Has anyone used a 260RS harness to do the swap? If so any tips you can share? Thanks!

Well it's been a minute since my last update. Car finally arrived 3 months late. It was a grade 4/B in the USS Tokyo auction but it's more like a 3.5/B. There is overspray and and few panels you can tell have been painted but not a spot of rust anywhere which is nice. Working through the usual issues, bonnet and liftgate struts, and a few maintenance items. I installed the front Ohlins, the BBS wheels and Nismo smoked side markers along with a set of Freeway Dolphin smoked LED front indicators to get a bit of a better look to it. I can't install the rears until I get rear subframe installed with the alloy rear uprights. The RB26 sits on the stand stripped down waiting for parts and the 5mt conversion will start shortly. I have a complete engine bay harness and engine harness from a 260RS, anyone know if it will be a PnP with the rest of the car harnesses?

You can get the harnesses on Yahoo Auction Japan for super cheap. Search WGNC34

Little bit of an update as the summer heat really slows things down here in SoCal. Picked up a bunch of Ohlins coil overs from Japan. One set of R33 GT-R single adjustable PCV (?), One set of R33 GT-R double adjustable (DFV?), and set of C34 Stagea rears. For the record the C34 rears are about an inch (~25mm) longer than the R33 rears but it seems to be all body length, stroke looks the same. The top mounts are different also. Got the R34 rear subframe back, waiting on the Nismo bits to arrive to complete that project. I've amassed a pile of 26RS clusters at this point but still looking for a Dolphin speedometer if anyone has it laying around? Also looking for the 260RS Tunnel Brace if you have one sitting on a shelf? other than that just playing with the wife's Cappuccino till more parts arrive.

I was thinking the auto ECU sees drive/reverse, the neutral/park is only for the starter circuit correct?

I'm curious to see what you find on this. I had this same thing happen in a S13 that I had converted to manual years ago. I replaced the IACV but never got it to behave properly. I always wondered if the ECU is looking for an "in gear" signal opposed to just being in neutral all the time (signal wise). In the Suby ECUs it would not use the correct mapping until it saw it was in gear. It still ran/drove fine but was never quite 100%.