New ITB build

[grelland]

After two build threads here (one with a home-made plenum/single TB; the other with a GSXR ITB setup) on my old trusty 1835cc engine, am I well on my way building a so-called oxy-boxer for my Ghia.

Some of you might know that I have a separate build thread for the engine itself on the wasserboxer/Type V forum here at STF, but I thought I should share my EFI-related items here on the Engine Management section also.

Some Specs of the engine itself:
WBX case
WBX 76 mm crank
AA perf lightened flywheel
EMPI H-beam 5.5" rods
Mahle 94mm barrels/pistons (barrels dramatically shortened)
CB Los Panchitos heads
CSP Super Street exhaust

Then to the EFI stuff:

Throttle bodies:
I was planning to reuse the ones I converted from a GSXR bike, but I reconsidered as I want to keep the 1835 completeas a backup, So I ended up buying a pair of these:


I ordered them with 52mm ID bore, which I personally think sound like a bit on the large side, but those were the recommondations from Paul that makes them, so we will see how well they work.

The arrived a couple of days ago, and so far I think they look good.

Trigger wheel:
I was playing around with some different ideas, but having seen fastback's solution to incorporate it directly into the flywheel really intrigued me, so this is how the AA flywheel looks after a visit in his workshop:

IMG_20130306_185349.jpg

I have bought a hall sensor from DIY Autotune, and will mount it in the original location after having drilled out the hole a bit.

This means that I will retire the trusty EDIS setup, and use a set of COPs that I planned to use on the 1835.

So all in all this is more of an evolutionary project, as there are not that many really new and inventive solutions, but still I thought I should share this project with you.

Once all is up an running, I was planning on looking more into a few new issues like knock sensor and EGT.

[supaninja]

Grelland- That is going to be a awesome setup, I look forward to your review of those dual single TB's, especially a comparison to the GSXR ITB's. I'm thinking my idle chunkiness is caused by the GSXR COPs, I have a set of the truck coils, but I lack the spare time to install them.

[andy198712]

looking forward to this also, which injector location did you chose?

the flywheel trigger wheel looks really good, very nice and hidden!

[Steve Arndt]

Subscribed! You will be blown away comparing the stroker engine to your old 1835.

Hey Nick, I have a set of CBR pencil coils you can try out if you want. pics of them; http://myweb.cableone.net/stevearndt/efi/efi111.JPG

[grelland]

I will be using the outer lower location for the moment. Mostly because the injectors will fire more or less directly on the valves, and since my car is a Ghia I have enough space on the sides.

[grelland]

Today I mounted up the sensor and flywheel, and checked that the sensor triggered well on this setup, and it did Very nice and clean signal

Here are a couple of shots of the install:

sensor trigger.jpg

hall location.jpg

The last picture shows the first hole I made, when I still thought I could use the 228mm flywheel.

[miniman82]

Might want to add some additional space for that sensor, as the engine wears the endplay will increase and possibly bang up the sensor. I don't know that particular sensor, but the EDIS VR sensor on my setup would still work when it was pretty far away from the trigger disc. Just something to think about, .040" should be about ideal.

[grelland]

Good point. As I have the test set up, I will do some trials in order to see what the distance can be before the sensor stops triggering

[fastback]

end play on WBX/OXY is close to non excistent

[supaninja]

Is it because of the Aluminum case, or the bigger bearings?

Steve- I just need a little time and lots of motivation to install my CNP's, in the meantime the GSXR COP's work awesome for everything except idle.

[fastback]

the "Die cast" alucase and the 3 piece bearing with steel thrust.

[Steve Arndt]

Might want to add some additional space for that sensor, as the engine wears the endplay will increase and possibly bang up the sensor. I don't know that particular sensor, but the EDIS VR sensor on my setup would still work when it was pretty far away from the trigger disc. Just something to think about, .040" should be about ideal.

Ask my how I know this. We had sub zero Fahrenheit weather here. My sensor gap goes really wide when it is that cold and it won't start. I had to tighten up the air gap, and that makes it VERY close to touching when hot.

[Steve Arndt]

The spark output doing simple free air tests with the CBR COPs compare to my IGN1 coils is amazing. The bike coils make a cute little spark kernel to the grounded welding table. The IGN1 will flash a solid sustained gap like lightning that scares the crap out of you.

Same thing with LS2 truck coils. Pansy spark compared to IGN1. They all work good enough for our applications though

[grelland]

Thanks for your input guys.

I hooked up the sensor, and could have as large as 2mm gap and still good signal, so I think I will be fine with a little more than on the pic. Will aim for abou 0.5mm, I think.

[andy198712]

Good shout!