Which is faster?

[2.5-12]

can I chip a 173 M20B25 ecu?

[nando]

uhm yes? that's probably for another thread, or a google search engine. ;)

[2.5-12]

uhm yes? that's probably for another thread, or a google search engine. ;)

yeah, realized this was hardly the place to ask that just after posting :oops:

[StereoInstaller1]

Awesome - thanks for the dyno sheets and explanation. I think that pretty much puts it to rest

I thought it was put to rest last year!

[nando]

it's always going to pop up because it seems like the obvious solution. Cheap easy power right? Except that magic pixie dust that gives you lots of horsepower for no money doesn't really exist..

[5KWattson]

it's always going to pop up because it seems like the obvious solution. Cheap easy power right? Except that magic pixie dust that gives you lots of horsepower for no money doesn't really exist..

try red bull in the gas tank

[JasonC]

Putting an i head on an eta does not make it a stroker.

[trackjunkie21]

Putting an i head on an eta does not make it a stroker.

+1 idk why people call it a stroker. Isn't a stroker when you bump up the displacement to get power? with an i head on an eta the displacement still stays at the original 2.7. Now with a different crank, etc that is a different story.

[digger]

ETA with I head, exhuast and induction

http://www.r3vlimited.com/board/showpost.php?p=875465&postcount=12

[nando]

that's probably one of the better ones. Added to my collection :)

[BMWLOVE100]

i think the 325i

[rcfanatic]

ETA with I head, exhuast and induction

http://www.r3vlimited.com/board/show...5&postcount=12

When Mitch says run all the I parts, you think he means pistons, rods, crank, intake, exhaust, flywheel? But if that was the case, he would have a full I engine right.. the block is the same correct?

From nando's dynos, the power Mitch makes looks too high for just 885 head, b25 intake and exhaust. Then again maybe milling it has that big of an effect.

[nando]

it's probably the milling.. we're talking a .2l displacement increase, but almost a full point drop in compression. The loss in compression more than makes up for any slight displacement increase.

[rcfanatic]

Does anyone know what the piston-valve clearance is when using the seta pistons? I wonder what kind of power you could make with seta pistons + milling

[nando]

it's probably similar to the i motor

I think it really only becomes an issue with aftermarket cams - where even a stock, unshaved head/block can lead to piston/valve contact at TDC.

plus it's not that difficult to cut the valve pockets a little deeper.