Car Down On Power Over Entire Rev Range, Causes?

[Rolls]

I don't trust myself to be able to reset it exactly without a timing light, I'm also scared that if it "fixes" the problem I might have just masked another problem. Definitely worth me checking the base timing though.

Cheers for all the help guys, appreciate the brain storming!

[hy_rpm]

Even though the log says it's running 20degrees Btdc at full torque if the cas is not set right it will be out by that amount

So say it's at 5 it will be +10 across the whole map and reason why it's sluggish and low on power meaning it will be at 10 instead at full torque

I think rb std is 15Btdc at 750rpm

Also don't go thrashing too long with the cas advanced as it might be pinging and you can't hear it but alil pinging won't be harmfull it's only if you are at full song for long periods

Best to check it with a timing light

It's easy to get it wrong as if the idle is to high when set it will be showing more advance the higher the idle as the ecu uses timing to adjust idle .

So if you have nissan data scan you can lock it in timing mode to set base timing or just dissconnect the tps and lower the idle via iacv screw to 650-750rpm and then set cas till 15

[hy_rpm]

Or another easy way to set it is

What ever timing your ecu talk says the timing reading on ecu your crank should be the same or move you cas till it reads the same and you don't have to dissconnect anything or change idle

[BlindspottNZ]

leak in intercooler piping?

[BlindspottNZ]

also it is common on RB engines for the exhaust manifold studs to come loose, I found several out on mine when I redid the head

[Rolls]

Ok I bought a timing light, where is the indicator on the motor? my crank pulley has no marking or anything on it, is it on the cam gear instead?

there is the indicator above the pulley but nothing on the actual pulley to indicate degrees or any coloured marking at all.

Edited October 26, 2013 by Rolls

[Ben C34]

It's on the pulley. it doesn't go right around. The is a mark for tdc then marks every 5 degrees, maybe 5 or 6 in total.

[Ben C34]

turn on engine and point gun at the pulley, they should be heaps obvious then. Also you should use a plug lead between the coil and plug to connect gun to as the loop can cause issues.

[Rolls]

Well I was feeling lazy so I just marked the timing and adjusted it and took it for a spin, ending up winding it about as far advanced as possible and it didn't ping nor did it feel any faster, idle went up maybe 50rpm max.

Put it back where I marked it but now I am really baffled, surely it should ping if I move it to full advance?

Once it cools down I will try dropping the exhaust, dont think the nighbours are going to like me.

Edited October 26, 2013 by Rolls

[ARTZ]

back it off a bit and see what happens

[Rolls]

Ok put a wire between the spark plug and the coilpack and used the timing gun. It is bang on the first mark and looks like this:

T

O || | |

An orange mark, followed by a black mark followed by two slits and it is bang on the first slit, is this 15 degrees?

Looking at the manual it should be 5,10,15 per slit but I only have two slits total?

Edited October 26, 2013 by Rolls

[Rolls]

Looks like the first slits are just missing, anyway I think I'm chasing the wrong problem if advancing it doesn't make it drive any better and it is smack bang on a line implying it hasn't slipped from somewhere else (would likely be inbetween two lines if that was the case).

Edit: I have an r34 neo but I'm fairly sure we used either an r33 or r32 front pulley, I don't know if it goes on only one way or you can put it on so the timing marks are completely wrong, anyone remember if it is notched and only goes on one way?

Edited October 26, 2013 by Rolls

[Missileman]

can only go on one way

[Rolls]

Any ideas what is up with my markings then?

[Missileman]

probably full of gunk and you can't see them properly, remove the cas plug and try cranking until you get the marks around in a spot where you can clean them.

[GTSBoy]

Easier way to move the crank pulley is to put it in 5th, roll it forward. Needs a little muscle, less spanners.

[hy_rpm]

It should be on the 4th mark also the marks should be evenly spaced so either the pulley might be different or just dirty

Also you did go the right way to advance the timing right ?

If not timing belt may be one tooth out

Try pulling no 1 spark plug out then put a screwdriver in there and turn the engine by hand till it's comes to the top

And that will be tdc and see what mark on the pulley corresponds

Take of the top timing cover and take a photo of where the cam gears are at and tell you if it's right

Note you might have to go one more revoloution of the crank till the cam gear marks are at the top

Edited October 26, 2013 by hy_rpm

[hy_rpm]

Also does it feel very laggy to rev up in neutral ?

If your timing belt was 1 tooth out retarded you won't even get enough advance with the cas fully turned

[hy_rpm]

I'm not sure if the r32 pulley for rb20 is the same as a neo rb25 pulley so the tdc mark on the pulley may not be in the same spot so best to check where true tdc is like mentioned

Edited October 26, 2013 by hy_rpm

[Rolls]

It should be on the 4th mark also the marks should be evenly spaced so either the pulley might be different or just dirty

Also you did go the right way to advance the timing right ?

If not timing belt may be one tooth out

Try pulling no 1 spark plug out then put a screwdriver in there and turn the engine by hand till it's comes to the top

And that will be tdc and see what mark on the pulley corresponds

Take of the top timing cover and take a photo of where the cam gears are at and tell you if it's right

Note you might gave to go one more revoloution of the crank till the cam gear marks are at the top

I turned it all the way to the left like the picture says to advance the timing.

Also does it feel very laggy to rev up in neutral ?

If your timing belt was 1 tooth out retarded you won't even get enough advance with the cas fully turned

I actually am starting to think that, I will take the timing belt cover off next.

It does feel laggy even in neutral.