ITB install finally coming together

[Grover]

I've still got a couple of days worth of work dealing with wiring, fuel lines, brake bleeding, etc... but today I finally mounted the ITBs to the motor for real. This has been several months in the making; collecting parts, fabricating parts, researching, etc.... I have been running for the last three years an S14 block and lower end, mated to a spruced up E12 head in conjunction with EFI via the old 318 intake and 325 TB, and running MSII and EDIS. The long term goal was always to go to ITBs but I just didn't have the time or money to bite it off. Now that the 02 is no longer my daily driver, the time felt right, and here I am with many hours of EFI tuning ahead of me. An airbox is also in the plans but haven't fully decided on the design yet. As you can see from the photos I'm running pretty long velocity stacks, about 5 inches, and they are split between the stubby air horns and the straight extensions. Where these two pieces mate is where the airbox will ultimately connect and enclose the little TWM air horns.

As I said, lots of work ahead, but am hoping to turn the key for the key for the first time in the next week or ten days, life and work schedule permitting. Woo hoo!!!

[Kidasters]

WOW! Sexy.

Ken

[cj]

Nicely done Tom.

[02again]

YEEEEEEow! very cool. Hopefully you will drive it down to So Cal Vintage event in late October? So we can all admire the handi-work

[Guest Anonymous]

nice Tom. Congrats!

[VintageAutobahn]

I want 4 of those

[Nicad]

I sure hope you document the whole process as you go forward. Beautiful work. All this with a Sahara exterior too.

[Harv]

Very nice clean work. What is the metal tube coming up from the middle of each pair of TB's? NO2?

John

[beast02er]

Love the car and the engine, always liked sahara cars tastily modified, somewhat sleeper look (not as loud as a red car)

Interested in the build as well, is that a vacuum log for the MS, or for the brake booster I see? Are you running MS2 for this? I am assuming you have seen the 77e21 site where the guy goes in depth about his ITB tuning, lots of good info there!

Also, I have a few Carbon fiber airboxes I have made that are close to being done but have not had the motivation to finish (i'm running 318i now...), i'd sell you one for a decent price assuming you'd have to do a little work (just with the mounting set-up). It looks like it would fit your set-up as the ITB's are angled up and not straight at the booster like DCOE's correct?

-Bryan

red73

[JohnC]

Wow. Lookin' good Tom! Get it done and drive it to the SoCal meet!

[Grover]

Thanks guys. As mentioned, lots of work ahead but I'll do my best to document it so that others may be able to learn from my trials and tribulations. Beast02er, I am indeed familiar with the 77e21 guy and his build write up has certainly helped me. The 1/2 aluminum "log" just next to the head is a common vacuum tube that will collect and feed the vacuum signal to the MSII unit. Each manifold port has a vacuum port put into it, and then I have a feed tube to the ECU dropping out of the log between cylinders 2 and 3. At the rear end of the log as in inlet for my E21-style cold start valve. The thinner metal tube mounted on top of the ITBs themselves is also a vacuum port but this is just providing vacuum to the fuel regulator. From everything I've read, these small combined ports are not really good enough to provide a steady signal to the ECU, hence the aformentioned common log.

And Beast02er, I'd at least be interested to see photos of the airboxes you are putting together. My hope right now is to build one that looks a lot like the old Alpina style ones since I'd like it to maintain some period appearance to it. That said, I'm also thinking an S14 box may be able to fit in there. I have a decent bit of clearance vs. the brake booster since I tilted the ITBs upward by a few degrees by having a local machinist cut out a triangular "wedge" from the manifolds to tilt everything upward; he then re-welded and bored them so it's nice and smooth and there's a very clear shot to the intake valves all the way from the airhorns.

[beast02er]

Here is a pic of the airbox.....trying to figure out the mounting here in the pic, I can take some others.

[Grover]

Cool. Thanks. Feel free to email me offline: trichardson AT clifbar DOT com

[Colin]

F^(# yeah, that looks GREAT. Looking forward to the build details!

[Tangarine-Dream]

Goodness Tom!

You've done it again - beautiful. I'm jealous. No. Envious - indeed.

Great job!

Best,

MS in Kuwait