Author Topic: ITBs (Read 8681 times)

gtatbrissy · « **on:** August 20, 2010, 09:58:06 PM »

I thought i would start a biuld thread for my itb set up.
im using 50mm itbs from an e36 m3. all iv done is pull the manifold off to trail fit the itbs and make a 'to do' list. i was thinking i will block of the heater hoses so i only have one pipe going from the block to the bottom of the radiator.

i need the modify the fuel rail because the return pipes hits on part of the tb

they are the main things, other little things like grinding the corners off the itbs should be pretty easy

so there is a little bit of work to do. any surguession/comments would be greatly apreciated.

DesktopDave · « **Reply #1 on:** August 20, 2010, 10:06:31 PM »

I'm making some popcorn to see this happen...other than that, I'm most likely going to be useless.

I'd just bend the fuel rail nipples personally, but I'd recommend making a custom fuel rail. The fittings are available out there on teh g00glez.

gtatbrissy · « **Reply #2 on:** August 20, 2010, 10:22:34 PM »

well i was thinking of making a new rail because i wana to run an adjustable fuel pressure reg

DesktopDave · « **Reply #3 on:** August 21, 2010, 09:51:21 AM »

I've seen some beautiful ones in alu. Alternatively, could you shorten the original M3 rail?

dsm2002 · « **Reply #4 on:** August 21, 2010, 10:33:38 AM »

I was planning to make a new rail for mine. Also attached is pics of my ITBS fitted to the M42 head.

... subscribed

romkasponka · « **Reply #5 on:** August 21, 2010, 11:25:06 AM »

More expensive, but better way imho.

Mine ITB...

Also thinking about custom rails and secondaries injectors over trumpets. After some time spent with google I found only one source of rail prifiles http://www.rossmachineracing.com/

dvmotorsports · « **Reply #6 on:** August 22, 2010, 11:43:21 PM »

Holy shit. Are those the ITB's I shipped you?

gtatbrissy · « **Reply #7 on:** August 23, 2010, 02:18:00 AM »

they sure are lol i will be modifing the vacuum rail and itbs this week sometime so i shall update u guys then

dvmotorsports · « **Reply #8 on:** August 23, 2010, 04:33:00 AM »

Wow. You move quick. Those have been sitting on my shelf since February collecting dust. How do they fit? And how the hell did you get everything setup so quickly?

gtatbrissy · « **Reply #9 on:** August 23, 2010, 06:18:25 AM »

Haha well the top 3 head studs dont line up but ill make them fit haha i wana get this done by mid september

dude8383 · « **Reply #10 on:** August 24, 2010, 04:43:07 PM »

Love it! I've always wanted and ITB setup on an m42...one day!

enildeR · « **Reply #11 on:** August 24, 2010, 07:48:17 PM »

50mm for a 1.8 is rather large. You have to remember that those throats were sized for a larger engine. It would most likely harm low-mid range due to decrease in velocity of the intake air. Do the ports even match?

Boyracer · « **Reply #12 on:** August 25, 2010, 01:58:24 AM »

Quote from: enildeR;95842

50mm for a 1.8 is rather large. You have to remember that those throats were sized for a larger engine. It would most likely harm low-mid range due to decrease in velocity of the intake air. Do the ports even match?

You cannot outright say if they are too big or too small without knowing how far they are located from intake valve. If the trottle is located right at the beginning of the intake trumpet it could be 70 mm and still be suitable because intake tract is usually tapered ie. getting smaller towards the intake valve. Altough in case of M42 and S50, they are located pretty much the same distance.

Port shapes and sizes match 99%

gtatbrissy · « **Reply #13 on:** August 27, 2010, 08:21:57 PM »

pulled out the old hack saw this morning and cut the itbs down to fit

still need the drill the bottom hole in the itbs because there is a collar around the bottom stud on the head. other than that im getting my mate to do some work on monday/tuesday so another update then

gtatbrissy · « **Reply #14 on:** August 31, 2010, 07:14:23 PM »

i sent away some bits and pieces to be modified so in the mean time here some recent pics of the car....