R33 RB25 with VEMS 3.3 and Adapter Harness

[email protected] · August 25, 2009, 02:59:50 PM

Time to start hard wiring things in place as was suggested in those Driftworks posts

irishtwincam · August 25, 2009, 03:15:32 PM

It would be nice to know smoeone who knows the skyilne looms like I know Toyota looms.
The earth thing needs to be done as well, as a precautionary check.

irishtwincam · August 30, 2009, 06:08:35 AM

Bypassed relays this mornig really quickly.
No cutout for the short time we idled it.
Normally cutout happens on cold start quite a bit.

Looks like the issue is with the coil side wiring for the relays.

Next plan of action is to get MOT and Mapping sorted!

gunni · August 30, 2009, 04:59:32 PM

Great , letÂ´s get this thing done

irishtwincam · August 30, 2009, 11:55:35 PM

Gunni, can you give me a ball park quote to map the car given its current state?

Wide band wired, plug just needs pulling through bulkhead.

Also can you send me the postcode we need to trailer the car to?
Or is there a rolling road near Cambridge we can bring it to that you could come down and use?
If thats more financially viable :D ?

gunni · August 31, 2009, 03:16:45 AM

Do you want rolling road tuning or what?
I can road tune it , and cheapest would be for me to come round and we just go out for a drive while I tune things.
Rob always mentions some airfield but I canÂ´t remember the name of it.

Cheapest way would be probably for me to come round and make the car drivable and we then just drive to the dyno.
When thatÂ´s done we can drive back and I can drive back home. No reason to trailer the car if itÂ´s not needed.

irishtwincam · August 31, 2009, 04:16:02 PM

We will try and MOT the car and retax it so its road legal, and then take it from there.

Can you please give me a qutoe to get it rollling road mapped start to finish in case the customer wants that.
Dyno printout is always a nice thing to take home.

gunni · August 31, 2009, 05:25:50 PM

I work at motorworx.
so if you bring it there.
http://www.motorworx.net/pricing.aspx

80pounds for the first hour , 60pounds every hour after that.
How many hours the car will take I donÂ´t know. But IÂ´d assume 3-4hours to be sure.

irishtwincam · August 31, 2009, 08:58:35 PM

GRRRRR! >:(

Ok so been debugging the wiring in the skyline.

With the key out and the ECU and adaptor loom unplugged, the injectors have 12v constant.
According to my understanding of nissan wiring and most other wiring in general, this should not be the case.
The injectors should only get live when ignition barrel is switched to IGN.

This is a proper wiring fault and is probably what has been spazzing out the switch side of the relays.

R33 wiring, clearer
http://paulr33.skylinesaustralia.com/diagrams/r33-rb25-wiring.jpg

R33 big schematic, but without details
http://paulr33.skylinesaustralia.com/diagrams/rb25det-engine-diagram.jpg

Looks like the alarm installer bodged it and joined all the lives together >:( hence why the switched sides of the coils are freaking
and all the accessories are freaking out.

This DEFFO needs fixing before it can be mapped, in case something burns out.

Side Note
pin 104 on the ECU is wired to EC36-pin6
Thats the fuel pump control relay, this is secondary to the fuel pump relay.
Im guessing this is the pumps idle voltage control and VEMS turns it off/keeps voltage high?

Gunni:
Cheers for the info dude.
When the shorting issue is done and MOT tax is paid up,
well probably get you to come down and street tune it so it can drive to the dyno.
Asked the woner today and hes happy with that.
Saves having to organise trailers and stuff.

irishtwincam · October 28, 2009, 04:45:34 AM

Ok, so relay issue was bypassed, vems installed, wasted spark on the stock COP.
Idling nice and revving.
Oh wait, theres a misfire...a bad misfire.

We diagnostify this as weak spark given that the stock ignitor got to around 50celcius.

1 Vauxhaull Omega V6 coilpack later and were idling without the intermittent misfire.
But wait, she doesnt sound too good?
Some diagnostics later and we find 2 dead injectors.
VEMS is pulsing, confirmed 100% that the ECU works, just the injectors are stuck.
Lying idle for a years sucks!

So its play the waiting game while some 850cc bad ass arrives along with some uprated fuel rail.

Current engine bay...

After successfully diagnosing WEAK SAUCE we went for a meal, at the palce where winners feast!

irishtwincam · November 30, 2009, 02:36:52 AM

Injectors ordered, should arrive next week.
Theyll be sent for flow testing to make sure all is in order and then we can continue the saga...

irishtwincam · January 04, 2010, 02:03:55 AM

GT35 I think.
Injectors arrived too.
Manifold on the way.
Ext wastegate ready to be used.
Custom DP needs fabbing.
Think theres a fuel rail on the way too.

irishtwincam · April 19, 2010, 04:01:58 PM

Owner is swapping the RB25 out for an RB26.
Reckons the RB26 with some forged pistons is easier/reliable to 500bhp?

Anyways, I wont bother updating until the new engine is running.

News:

R33 RB25 with VEMS 3.3 and Adapter Harness