My Rb30Det Build Timing

[B I IL IL Y]

I've recently built a rb25/30det slapper and I'm having troubles with the timing, I set the crank to tdc and set the cam gears to the marks and when I check it with a timing light it shows it roughly 40-50 degrees off tdc and I stuffed around with the cas and turned it all the way and still got 30 of tdc what could be my problem?

I have a tensioner above the water pump and a idler on the lower

[Ben C34]

Are you using the loop?

What is your idle at?

[Ben C34]

You need to put a plug lead on to number one coil connect it to the plug and connect pickup to that. .

Disconnecting the tps should lock the timing the ecu is putting out to 15. It does vary to maintain idle, it varies a lot if the idle is high or unstable.

Do you have nistune or consult to view what timing the ecu is putting out?

[B I IL IL Y]

With the light I just put it on the coil signal wire and I had a mate with a 25 and we tested his and it was fine. I'm just running it with a stock ecu until I know everything is fine because I was $1000 last time I took it for a tune, I have a haltech platinum

[Ben C34]

What? Stock ecu or haltech platinum? Which is it?

[B I IL IL Y]

I'm using the stock ecu.

[Ben C34]

Ok. So disconnect the tps and try again.

I assume you have triple checked cam timing?

[B I IL IL Y]

Yeah I've checked it so many times, do you have to disconnect the vct solenoid as well?

[GTSBoy]

No. The disconnection of the TPS is simply to force the (stock) ECU to lock timing at 15°. VTC, whether on or off, doesn't affect the exhaust cam and the CAS anyway, so doesn't make any difference.

[B I IL IL Y]

After work I'll go check all the marks again and test it and post the result

[B I IL IL Y]

So it's meant to be 15° btc

And the rpm is meant to be 650?

And do I need a loop wire or is using the wire on the coil pack plug good enough?

[GTSBoy]

The coil pack signal loop is famously unreliable. The only way to get a good pulse for timing is to put a plug lead between #1 coil and its sparkplug and clip the timing light trigger onto that.

[Dose Pipe Sutututu]

So it's meant to be 15° btc

And the rpm is meant to be 650?

And do I need a loop wire or is using the wire on the coil pack plug good enough?

yes

yes

no - buy a $5 spark lead and do this (not my photo):

[B I IL IL Y]

I having trouble getting it to idle at 650 the lowest I can get is 800

[Dose Pipe Sutututu]

Even when you adjust the idle screw?

Close enough still should be at 15 degrees

[B I IL IL Y]

Yeah had it loose and had the aac valve all the way in too

[Badgaz]

really? that sounds f**ked. the aac valve should have enough adjustment for your idle....turning the screw clockwise reduces the amount of air let in for idle (decrease rpm) and vice versa for increase.

[B I IL IL Y]

Yeah I had it all the way in and I thought it should almost stall, I'll put a known working one properly

[B I IL IL Y]

And I'll pressurise the ic piping and test for leaks

[jiffo]

Don't get too hung up on the AAC until you've checked the air reg is also closed up.