Timing Issues - Help

So the CAS spline is advanced in the exhaust cam, could this possibly be to allow you to retard the exhaust cam with a vernier pulley and still have some adjustment on the CAS? But it doesn't make sense that the CAS is outside of its normal range with the cam set to standard.

To me it sounds like a manufacturing issue with the cam, it may not have been indexed correctly when the CAS spline was formed.

Perhaps a custom CAS mount is required? One that does away with the front cover.

Exactly what I was thinking but why would an amazing company like tomei make such a basic mistake, But anyway I got the CAS to 15 Degrees on the stock cover. The lowest number it can go now is 10 Degrees fully retarded, 15 is just off the stopper .

But for sure the spline is not in the same place as the stock exhaust cam

Please do share.

OK let me start from the top, Idle Vacuum has increased from .48 bar to .54 bar, My Idle speed has increase to 1100RPm this was set back down to 900Rpm

Car starts easier possible increased compression? At Idle the MAF voltage has increase my low and midrange are leaner my top is also leaner and peak boost voltage MAF voltage has increased I need to resize my charts.

Also I have a strange feeling the exhaust flow characteristics have changed my cars doesn’t sound the same

So how did you get the timing down to 10 degrees now when you couldnt earlier??

Gary57 wrote:

So how did you get the timing down to 10 degrees now when you couldnt earlier??

a hammer like hanco always said

Pinkfluffybunnys wrote:

OK let me start from the top, Idle Vacuum has increased from .48 bar to .54 bar, My Idle speed has increase to 1100RPm this was set back down to 900Rpm

Car starts easier possible increased compression? At Idle the MAF voltage has increase my low and midrange are leaner my top is also leaner and peak boost voltage MAF voltage has increased I need to resize my charts.

Also I have a strange feeling the exhaust flow characteristics have changed my cars doesn’t sound the same

So basically it sounds as if your engine is now flowing more air, out of interest, is your boost level stiil the same, increased, or decreased?

Easier starting I would think is easier because of a reduced dynamic compression ratio. High comp na motors normally struggle to turn over.

So how did you get the timing down to 10 degrees now when you couldnt earlier??

Howzit, Sorry took my boss for a spin, left the cam timing and used my spare CAS that is off by a tooth

So basically it sounds as if your engine is now flowing more air, out of interest, is your boost level stiil the same, increased, or decreased?

To be honest I havnt really looked, When I do the run home I will check

Easier starting I would think is easier because of a reduced dynamic compression ratio. High comp na motors normally struggle to turn over

It can go both ways, Low comp will also cause hard starting look at a rotor but its normally very high 12 -15.1 comps that have a hard time starting and its normally the starter pulling to many amps and not getting enough rotation the easiest will be to do a comp test when I get a chance I will do this also would like to pull the plugs now

Howzit, Sorry took my boss for a spin, left the cam timing and used my spare CAS that is off by a tooth

HUH, how can your spare CAS be out by a tooth??

have you heard back from the japs yet?

have you heard back from the japs yet?

Nothing Yet

HUH, how can your spare CAS be out by a tooth??

Its a long story, About a damaged CAS that has found a home 😂

Its a long story, About a damaged CAS that has found a home

Please tell me, I have lots of CAS's laying around and non of them are 1 tooth out, I have stripped loads aswell and there is no way to get them wrong.

Exactly what I was thinking but why would an amazing company like tomei make such a basic mistake

this is just a thought, but you did make sure you bought the real deal, you will fall on your back to see what the chinese are making pirate copies of these days.. and a mismatched locating pin is just the sort of shit they are famous for.. 😮

Gary57 wrote:

Its a long story, About a damaged CAS that has found a home

Please tell me, I have lots of CAS's laying around and non of them are 1 tooth out, I have stripped loads aswell and there is no way to get them wrong.

Gary, I have a spare CAS with the exact "issue" as PFB's. It was part of the reason why I had such a mission to get my motor running after the rebuild. (Just ask Ashley about the whole afternoon messing with wiring only to discover timing is off the chart)

Anyway - glad you got it sorted. And glad you got a use for the loopy CAS - guess this means I should buy a set of PONcams too 😂

Gary, I have a spare CAS with the exact "issue" as PFB's. It was part of the reason why I had such a mission to get my motor running after the rebuild. (Just ask Ashley about the whole afternoon messing with wiring only to discover timing is off the chart)

The reason I ask is because I have had 2 cars now that knock badly if I advance the timing to 15degrees on the cranck, no idea why, I have to put timing on like 5 degrees on crank and then they go like kak. Fit management systems and the knock goes away.

this is just a thought, but you did make sure you bought the real deal, you will fall on your back to see what the chinese are making pirate copies of these days.. and a mismatched locating pin is just the sort of shit they are famous for..

Very good point, If so they went to allot of effort. Tomei box', Tomie Instructions, Tomei warranty, stickers plus Tomei markings on the cam's and the invoice from Tomei Japan

Please tell me, I have lots of CAS's laying around and non of them are 1 tooth out, I have stripped loads aswell and there is no way to get them wrong.

Damn why can’t you leave it alone now I have to write out the story. As you know the CAS has a locking pin that holds the spline housing to the shaft on my original item the pin came lose and started to wear into the shaft so when I found out I took the pin out and had the item Heli-coiled to lock it again but the wear was quiet bad and the CAS was about ¾ a tooth advanced but still set to 15 degrees so when I go the spare motor about 3 years ago I used its CAS and put this messed up one away for spares

Anyway - glad you got it sorted. And glad you got a use for the loopy CAS - guess this means I should buy a set of PONcams too

Dude get Pons they are amazing

The reason I ask is because I have had 2 cars now that knock badly if I advance the timing to 15degrees on the cranck, no idea why, I have to put timing on like 5 degrees on crank and then they go like kak. Fit management systems and the knock goes away.

That sounds like cam timing to be honest, Even with the loopy CAS the car never knocked, Plus your doing timing with the light so even if the caps is upside down as long as you get the base the management will handle the rest

Damn why can’t you leave it alone now I have to write out the story. As you know the CAS has a locking pin that holds the spline housing to the shaft on my original item the pin came lose and started to wear into the shaft so when I found out I took the pin out and had the item Heli-coiled to lock it again but the wear was quiet bad and the CAS was about ¾ a tooth advanced but still set to 15 degrees so when I go the spare motor about 3 years ago I used its CAS and put this messed up one away for spares

I take it as the half moon was broken off at this stage??

That sounds like cam timing to be honest, Even with the loopy CAS the car never knocked, Plus your doing timing with the light so even if the caps is upside down as long as you get the base the management will handle the rest

Nope Cam timing is 100%, the cars were both drive perfectly fine and then they bring them in one day with this knocking noise... Knock sensor??

I take it as the half moon was broken off at this stage??

That thing was gone long time ago...

Nope Cam timing is 100%, the cars were both drive perfectly fine and then they bring them in one day with this knocking noise... Knock sensor??

As soon at the knock sensor fails the motor registers a DTC and switchs to the knock maps

I think it could have a knock sensor error, I know 1 did.