Does that mean that MY's 78 to 86 fire in a different pattern i.e., one at a time or other than you guys described above?

Thanks Jim,

DaveK9

 

All the electric injector cars fire all the injectors at once...batch fire The early CIS cars which is Continuous Injection System the injectors spray ALL THE TIME just varing amounts.

 

Go it, and thanks again Jim!
Never did catch what MY EpsonT was converting.

EpsonT?

DaveK9

 

JB wrote:
Isn't it twice per revolution to a certain rpm level, then once per with an extended duty cycle?

 

Louie mentioned in a Sharktuner review that it switches over at some higher RPM.

 

I think it is once per revolution of the crank or twice per complete combustion cycle. Above a certain point (5300rpm at WOT?) it changes to once per combustion cycle.

Isn't it funny that we're all speculating instead of just picking up a WSM or using the Rennlist search function?

 

I think we're all wainitng for J. Speake to chime in. Lazy bastard!

 

Jim, this is nearly correct. The CIS system has fuel pressure to the injectors all the time. The pressure determines the volume of fuel that is drawn in during the intake valve openning and piston withdrawal. The piston moving down creates an area of 'negative pressure' for lack of a better term, overcoming the spring in the check valve of the CIS style injectors, and drawing fuel into the intake. That's why the CIS style injectors have to be close to the intake valve, there is no CIS throttle body injection, just multiport.

The CIS injectors are shut off during intake valve closed time. It is a remarkably efficient mechanical system, all based on pressure from the metering plate to the fuel pressure regulator.

Doc

 

I don't follow this, isn't the whole intake at a lower pressure during idle than any other speed?

Or does the fuel pressure track the manifold pressure to compensate?

Sounds kind of touchy.

 

Yes. The fuel pressure regulator has a vacuum line from the throttle body.

 

Hes a sleep at this hour...or crawlimg home from the pub.
IRRC its appx 51-5200rpm the switch occurs...not sure..but it does occur.

 

I haven't seen it in the WSM. I tried searching Rennlist. I know it was in a discussion of the Sharktuner by Louie, but I've struck out so far.

 

Ok.. I've got the picture now. I was also asking about the EGT sensors.. Would they work together with a EGT gauge.

dvaok9, I has a twin turbo converted m28/47 and was rebuilding the engine harnes so i could use it together with my DTA p8pro ECU.

 

EpsenT I got all that from your first post.
My question to you was what model year of 928 are you converting to a drifter?

 

Ahh.. Sorry davek9. It's a 79.