Does anyone know if the stock distributor knows which cylinder is firing?
I ask because I'm soon to put a F.A.S.T XFI ecu into the car and wanted to know if i can run sequential instead of batch with the stock distributor or would i need to get a different model with a cam angle sensor as well as crank
?

 

Well if you're going through all the trouble of changing out the ECU and rewiring, why not use the LS1/Express Van PCM and Vortec distributor/crankshaft ring/timing cover?

With the eficonnection 24x crankshaft ring you can use a true LS1 calibration and individual coil packs. Otherwise use the vortec 4x ring, vortec distributor/coil, and the Express van calibration.

A lot of info on it in the TPI OBDII sticky

 

well i've already paid for the XFI ecu so that idea is out of the equation.
I'm assuming then your answer is "no" to using the stock distributor?
I don't want a stock ecm that can only be prom'd.

But i do want sequential efi as from what i've summised, its of the most benefit to it as its powerband is in the low rpms meaning fuel has more time to pool in a batch setup.

 

The stock dist. as is sits will not be able to tell the XFI Ecu which cylinder it is firing on. You may check out the OBDII thread like Ruiner stated to see if there is some parts you can swap out to make the XFI unit work for you.

 

yeah if you already have the xfi ecu then you still might be able to use some of the Vortec parts to get the ecu the inputs it needs.

The L31 vortec motor uses a 4x crankshaft position sensor in the timing cover. Simply swap the timing cover, sensor, and crankshaft ring.

Also the Vortec distributor has a 1x camshaft sensor, so that for any given value of the crankshaft sensor, the ECU can tell if it is on the compression or exhaust stroke, intake or power stroke.

Also just FYI the newer LS1 PSM's do not require new PROM's, they are flash based.

 

If you want a relatively cheap way to get sequential injection with no prom, go to www.weswoodperformance.com. Its a small speedshop near here, and theyve alrdy tested their new Digispark system on a couple of corvettes. My 305 will be the testbed for the F body setup. Theyve adapted an LTX pcm with a modified harness, dizzy, and MAF sensor. More email traffic to them would get them moving a lot quicker

 

If thats true then the only part I'd need is the distributor
The XFI ecu would do the job of the PCM and already have the maf sensor

 

Its a soon to be patented system with a MODIFIED distributor....not sure if Wes would let jut one go and not a complete kit. You're more than welcome to call him. The shops number is (850) 907-9100.

 

Thanks for that, btu I'm in Australia so calling probably isn't the best option.
I'm assuming there'd be enough sensors and everything in the car already to be able to work out which cylinder is firing tho?
It would only have a problem for the first few cycles yeah?
Does the distributor have anything to do with the cam or just crank?
I saw the post about changing the timing cover with a vortec one and using the camshaft sensor, is that all I'd have to change?

 

The cam interfaces with the distributor via a small gear drive on the end of the cam and dizzy. Crank --> cam via timing chain --> dizzy via gearings on cam/dizzy. Now as I understand it, the way the coil on cylinder systems works (which is the crank reluctor dealy) is that once timing is set, each time the crank reaches a certain position, it sends a pulse to the coils for firing. If you look at the Coil on Cylinder sticky at the top of the TPI board, theres WAY more info on how it works.