Timing Issues - Help

veecee · Post by **veecee** » Wed Jun 03, 2009 9:13 am

you sure that bottom cover plate is not bent somehow? i've also had that issue before!

if it were me, i would only be 100% if i could see the bottom sprocket, but thats a big mission!

Charlvdw · Post by **Charlvdw** » Wed Jun 03, 2009 9:20 am

veecee wrote:you sure that bottom cover plate is not bent somehow? i've also had that issue before!

if it were me, i would only be 100% if i could see the bottom sprocket, but thats a big mission!

A mission ,but the rite way.

Pinkfluffybunnys · Post by **Pinkfluffybunnys** » Wed Jun 03, 2009 9:24 am

if it were me, i would only be 100% if i could see the bottom sprocket, but thats a big mission!

I get what your saying and I do agree but I know the timing mark on the Crank pulley and sprocket are correct, I have manual checked them and checked the reference with the pulley on and the sprocket lined up.

I really think its something with the cams, I mean I have done timing on the CA18 about 30 times and I have never had this shit.

But unrelated I am looking over the logged data and there is some interesting stuff here

Charlvdw · Post by **Charlvdw** » Wed Jun 03, 2009 9:42 am

Pinkfluffybunnys wrote: But unrelated I am looking over the logged data and there is some interesting stuff here

Please do share.

Guy · Post by **Guy** » Wed Jun 03, 2009 9:43 am

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.

Pinkfluffybunnys · Post by **Pinkfluffybunnys** » Wed Jun 03, 2009 9:58 am

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

Gary57 · Post by **Gary57** » Wed Jun 03, 2009 10:48 am

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

poizen · Post by **poizen** » Wed Jun 03, 2009 10:51 am

Gary57 wrote:So how did you get the timing down to 10 degrees now when you couldnt earlier??

a hammer like hanco always said

Guy · Post by **Guy** » Wed Jun 03, 2009 12:22 pm

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.

Pinkfluffybunnys · Post by **Pinkfluffybunnys** » Wed Jun 03, 2009 12:36 pm

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

Gary57 · Post by **Gary57** » Wed Jun 03, 2009 12:55 pm

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??

veecee · Post by **veecee** » Wed Jun 03, 2009 1:00 pm

have you heard back from the japs yet?

Pinkfluffybunnys · Post by **Pinkfluffybunnys** » Wed Jun 03, 2009 1:03 pm

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

Gary57 · Post by **Gary57** » Wed Jun 03, 2009 1:22 pm

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.

300sx · Post by **300sx** » Wed Jun 03, 2009 1:36 pm

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..