M20 ITB's

[jules325i]

even though the extrudeabody are 45mm they seem like they slightly farther away from the head than the dbilas which when taper is included means the engine may not see them as large as the dbilas 45mm. Dbilas do have them with 40mm apparently which would suit the smaller M20's, clearing the booster seems to make some compromises.

For comparison the entrance to the stock runnners is 45mm and tapers to 35mm ovalish shape at the head.

So if i contact Dblias dynamics and there is a 40mm it could be made to work effeciently.

[digger]

even though the extrudeabody are 45mm they seem like they slightly farther away from the head than the dbilas which when taper is included means the engine may not see them as large as the dbilas 45mm. Dbilas do have them with 40mm apparently which would suit the smaller M20's, clearing the booster seems to make some compromises.

For comparison the entrance to the stock runnners is 45mm and tapers to 35mm ovalish shape at the head.

[jules325i]

Sounds like you are looking to build something like this http://www.r3vlimited.com/board/show...ht=Euro+muscle

Build thread here
http://www.r3vlimited.com/board/showthread.php?t=200342

That thread was a perfect build for me.
he even is running the willwood BBK that im interested in thanks!

[jules325i]

so all in all they are just asthetics because they are to big.

[der affe]

I have dbilas on my 2.7i with a 292° dbilas cam. It took MSII and a fair amoumt of fiddling with to get it to run pretty well. That being said, it would be much better suited to a much larger engine with significantly higher compression.

I am building (albeit slowly) a 3.1 for the car. It will be supercharged with an M90 roots blower running 17 lbs of boost.

To answer an earlier question, according to dbilas, they will take 20 psi of boost before the throttle shafts start to leak boost pressure.

[SkiFree]

Or like these fellow Ausi M20's I put up in my build thread.

Extrudabody kit + IE 3.1 stroker


S54 ITB's + IE 3.1 stroker

[e3o]

Sounds like you are looking to build something like this http://www.r3vlimited.com/board/show...ht=Euro+muscle

Build thread here

http://www.r3vlimited.com/board/showthread.php?t=200342

[digger]

2.8 stroker 10.5:1 with schrick 272

With that all you will gain is throttle response and a big hole in midrange may a bit extra up top but "a bit" is the key, something with less than 40mm diameter (38mm) with a system that kets you adjust the runner length and different plenum is what i'd be doing if going in that direction.

save ur money for an e36m3........seriously they are pretty cheap

[nando]

nice but dbilas ITBs are way too big for that cam

[jules325i]

2.8 stroker 10.5:1 with schrick 272

[digger]

So i might have to just go for it!

its not what i meant, if you read your post it may hit you.

What are the specs of the engine?

[jules325i]

So i might have to just go for it!

[digger]

How much increased HP gain would i expect

only you can tell us that

[jules325i]

How much increased HP gain would i expect

[Robotin]

That makes 2 of us then, I suspect there are many others that feel the same way. Comparing an S54 to an M20 is not really what the point of this thread is.

s54 is a prety sick motor. and an s54 would haul ass!!! but with those S motors. u would have to have a pretty beefed up front suspension. and your e30 would b super front heavy. therefor. a terrible DD. i would much rather have a correctly modded and tuned or turbo'd m20. to have good daily driveabilty. and haul ass when i want. i definetly believe a properly beefed up m20 could hold its own with an S54 e30....





i would LOVE ITBs for my m20.....