As you may have seen on my website I have started work on my multi-port throttle project. With all the talk of CAI's going on I thought these pics of what's behind the MAF might be of interest.

 

thanks for the pics... saves me some time tearing it apart and all...

 

Simon: when you had the TB removed, did you happen to identify a good location for a 7th injector that can be tapped into the housing ? I would hate to install an injector into the plastic pipe with the kind of abuse my car gets on the track.

 

Please tell me about your port idea, I also feel if there were more then one TB on the intake the Crossfire would kick Azz without question, kinda like the 3 two barrel carbs back in the 60's and 70's... I've looked at the idea but cannot figure how i would mount another TB on the intake manifold... I do not feel splitting two TB to feed back into the same size mounting hole on the intake would get much done... tell me where your heading with this, I kept all your pictures you posted on this thread, thinks for the insight...hooah

 

Simon

How to make a great machine better!!!

Between your photos and HDDP's...
the learning and the intrigue factors for the rest of us comes at a bargain! no book... course... can be more comprehensive. these photos would be a good supplement to the Service Manual...

Anyway thanks,

J

 

Well the idea is to junk the single TB and 'trick' switched length intake plenum assembly (the big cast lump between the 'V', and replace it with 6 single individual downdraft throttle bodies (I looked at triple twins but the manifolding would be compromised). Like you say a modern version of a multi-barrel carb setup form the 60's.

Have a look here to see what I am working on.

There is not much room in that area so I am CADing up a 28mm injector sandwich plate to fit between the TB and plenum for those that want to retain the single TB. It will mean the MAF assembly will sit back 28mm causing problems with fitting the engine cover, but most people going this route will have ditched that anyway.
I am not sure which bits of the original MAF/elbow you still have with your ASK setup but it will probably just mean that the twin pipe assembly will move back 28mm nearer the firewall. I'll post up some pics here and on my site later.

 

Thanks Josh, I figure that while I have the thing apart I might as well share what I find. It may be a while before you start seeing pictures of pistons, con rods and bearing shells though - over to you Derek.

 

I'll probably be able to do the "show & tell" on the Schrick cams in about two months... Although I am not going to attempt it as a DIY project... I have a good old German MB mechanic that used to race... He has all the specialty tools required and also the mfg. software...

Let me know how your 4WD dyno works-out... I think that's the best and ONLY way to get a correct dyno run with this car...

 

Here's a pic of the drawing for the TB sandwich plate. I am going to make up a prototype and see how it all fits - there's not much room to get the injector in there with all the tubing etc.

 

That looks like a good collar to fit a wet nitrous injector or additional fuel nozzle. Tuff part is going to be getting it to fit with the existing elbow, as you well know, it's really tight.

Would it be easier to design a different elbow out of aluminum with a tighter radius and an extended collar to fit an injector and move the 02 sensor up a little bit to prevent any over-spray from the added injector (nitrous or otherwise).

Cheers

 

I guess you could do a replacement elbow, but I was working on the basis that the TB collar is simpler and cheaper to make. I've measured it all out and it will fit, but the MAF/elbow is 28mm further back. The limiting thing is the connector on the throttle actuator as it starts to impinge on the bell housing preventing any further rearward movement. I checked and it is possible to mount the TB upside down to give more clearance but the butterfly then obscures the injector as it opens. I'll make one up and take some pics of it in situ.

On a side note...my ECU parts should be here this week - i just checked the tracking system and they have just landed in the UK. I had to get them from the US in the end since the local guys didn't have stock. I'll let you know as soon as I get a default map for the 7th injector running - you should be able to 'plug and play' then.

 

Here's a pic of the TB/MAF positioned where it would be after fitting the injector collar: