Cat cam 438 correct timing, who can help?

[getikte]

okay so my ITB build is nearing completion, just have some small tinkering to do and withing a couple of weeks it should (fingers crossed) be ready for mapping at EFI. Prior to that i am wanting to get the engine timed correctly to suit the 438 catcams i have fitted (i believe they need timed to 421 settings)

The engine is currently timed to factory settings however is there someone out there who can help in timing the engine correctly to best compliment the cams and ITB's. Im based in Newcastle but happy to take the car anywhere in the UK if it means getting the best out of it.

Any recommendations are much appreciated, if there is anyone on here who can do the work please get in touch!

 

[JamesBryan]

@bloke may know.

He does all the 197 cams that get mapped at EFI.

I was under the impression that 438's are timed to oem timing...

 

[imprezaworks]

@bloke is who I would trust

 

[getikte]

sure ive heard his name floating around before, im pretty sure people recommend to time the 438s up as the 421s for the best results. at least thats what a couple mates were told at RS tuning when having their engines mapped up with 438s at standard timing

 

[npt]

Contact catcams first to see what they say, pretty sure it'll be standard settings

 

[getikte]

this is the reply i had from EFI when in talks regarding the mapping

Thats right – in short, the 438 has the same lobe profiles as the 421, and with the 421 being more suited to ITB’s you should re-time the 438’s such that they act like 421’s. From memory the inlet timing is fine Mark but you need to move the exhaust cam. I don’t work with them mechanically Mark so it’s not the sort of thing I’d remember I’m afraid, but if you go to Catcams website and look at the specification of the 438 and compare it with the 421 you’ll be able to see how many degrees it needs to turn, and in which way.

421 spec

438 spec

Only difference i can see is to the lobe exhaust angle by 8 degrees

 

[bloke]

give me a shout if you want it sorting, i'm only about half hour from chris as well.

 

[KB-172]

@getikte Did you ever suss out what the settings were to time the cams? i have 438s at the mo and recently fitted ITBs, ive actually lost torque over the standard inlet! im hoping if i can time my 438s to 421 timing it may help ?‍♂️

 

[Crazylegs]

Hi

Sorry to open up an old thread. What kind of power did yours make with the ITB's and cams?

How does it drive now too after being mapped? Did Chris map it via the OEM map or one of these?

EFI Parts – Race engine management, parts & tuning

www.efi-parts.co.uk

Cheers