308 V12 conversion begins

I didn't write very clearly what I was thinking. I meant to say that if you saw one then they must be out there. Read what they say on the 3r it soulnd lke they are putting 2 injectors per driver to get to 12 and in that case thry can never be independant, it sounds like that was not the case on the earlier units.

I agree that sequential is not really optional, it's required.....now I just need to concivnce the euc people of that as most of them are telling me, "oh you just batch fire".....which gets the WRONG stamp.

 

Most of that is done, there will be some more on the heads in a couple weeks but we are moving into a new phase. I've left quite a few boring details undone and I'll need to finish them up, and start doing stuff that looks like a normal rebuild.....and that means I'm making progress.

 

Cam guy says he's got 4 lobe options picked out and will be grinding test lobes tomorrow afternoon.

 

very cool. silly, but cool.

 

or an 800 hp 308

 

A quick update. I’m getting really close to finished on the efi side job. 2 more weeks at the most and I can start turning the TR head intake ports into chips on the mill.

I think I have the ECU thing figured out now once and for all…or at least until I change my mind again.

It looks like the answer is a motec M800 and some creative wiring/set-up. The base unit has 12 injector drivers that can each drive 2 high impedance injectors, so I wire both the low and high power injectors to the same driver. Then I put a bank of solid state relays on the high power injectors and use one of the aux outs to trigger the relays turning on the high power injector at the desired load point. It’s not a perfect solution as there will be rich in a 0.1 kPa window between where the injectors turn on and where the maps as set to reflect the additional fuel but on a sensor that goes from 0 to 100, 0.1is a pretty small mistake that would be all but impossible to notice.

By living with this little error I get just 1 ecu that the car is mostly already wired to accept, individual cylinder tuning maps and traction control. If I find the error is noticeable I can always add a second ecu later but the car will be up and running without spending crazy money.

I’m also going back to the distributor plan so I don’t need the ignition expanders. A 1984 engine should have distributors anyway to look right and again I can always add a direct fire ignition later if there is an actual need.

The only thing that could make this an even better plan is would be if someone following this thread is a motec dealer who can give me the “this it toooo cool” (AKA the “you poor stupid b*stard”) discount

No word from cam guy……I’ll call tonight.

 

Yup.

 

I'll check, generally even on ebay they are not cheap....the US dealers put quite a markup on them....like 100% figuring most people need many hours of tech support to get it running right and they throw that in "free". There are ways to not pay the 100% markup though

 

The best is tough to define. A motec M800 would be an excellent option for sure and has the most stuff. I like the cylinder tuning maps a lot for example becasue it lets you really get stuff matched nicely...but if you can live without all the stuff there are a LOT of options for a V8 that are good. A lot of people here run Electromotive and are happy. Haltechs are nice to if you have a cis car becasue they will read the stock triggers and fire the stock distrubutors making the install pretty easy (motec will as well).


Now the really funny thing with me deciding I need an M800 is that way way back at the beginning of this thread I sold an M800 to pay for the TR heads thinking I didn't need it......DOH!

 

After a few emails with Australian motec engineer that started out with basically “it should work but there will be some issues at the cross-over point” we got to "Switching injector power on and off through a relay is crap no matter how you do it so two ECUs would be the only way to do it."

It turns out the motecs will link over their canbus and act like 1 big ecu. I didn’t know that. There is no question this is the best option. I guess I need to make sure I have enough space and enough wires for 2 ecus.....

 

Fantastic, thanks1

They don’t happen to have a factory outlet store where they unload the scratch and dents or warranty repair units extra cheap do they?