Master Cylinders and Brake Boosters

[Mike B.]

If the total piston area of the E36M3 calipers is greater than that of the stock brakes, then yes, your pedal feel will be softer with all other things equal.

[Taper]

Good thread!

Exists another booster smaller than 320i?

I'm sure that not work with s50 swap

[RobertK]

NO. Don't do that!

The intake manifold is designed to distribute the air evenly between cylinders, changing the shape of it could screw that all up. You could end up with a cylinder that runs rich or lean, or with vacuum leaks or whatever. Swapping brake boosters is stupid easy, and you can end up with the same or better pedal feel.

PS: If it was the easiest way, don't you think more people on here would do it?

No, because most people don't know how to properly use fiberglass.

I've personally seen an S52 swapped car that used this method and it runs just fine. It does not affect the vacuum or performance on the engine.

It's heresay like this that keeps people from innovating new methods.

[FredK]

Good thread!

Exists another booster smaller than 320i?

I'm sure that not work with s50 swap

Here's a thread on fitting boosters with the S50

http://www.r3vlimited.com/board/showthread.php?t=78855

I've personally seen an S52 swapped car that used this method and it runs just fine. It does not affect the vacuum or performance on the engine.

What Matt meant is that when BMW designed the intake manifold, they most likely optimized the flow characterstics so that each cylinder would receive the right amount of air, and disturbing the internal shape of the manifold can disturb the flow pattern, possibly causing cylinders to run non-optimally.

In practice, it may be possible that the amount of performance lost is negligible, or you could be burning a valve. You can't really know that, because the DME does not monitor individual cylinders for combustion quality or temperature.

[Taper]

Here's a thread on fitting boosters with the S50

http://www.r3vlimited.com/board/showthread.php?t=78855

What Matt meant is that when BMW designed the intake manifold, they most likely optimized the flow characterstics so that each cylinder would receive the right amount of air, and disturbing the internal shape of the manifold can disturb the flow pattern, possibly causing cylinders to run non-optimally.

In practice, it may be possible that the amount of performance lost is negligible, or you could be burning a valve. You can't really know that, because the DME does not monitor individual cylinders for combustion quality or temperature.

Thanks a lot! ;)

Is it a suicide mount directly M/C without brake booster?

Is imposible try to stop the car?

[SpecM]

Thanks a lot! ;)

Is it a suicide mount directly M/C without brake booster?

Is imposible try to stop the car?

drive your car up a hill, turn it off, pump the brakes a few times to bleed off residual vacuum, and try to stop the car while rolling downhill.

If you're dumb enough to try AND IF you survive the wreck, post your results ;-)

[Mike B.]

Thanks a lot! ;)

Is it a suicide mount directly M/C without brake booster?

Is imposible try to stop the car?

No, it's not suicide. But it requires a custom mounting plate, push-rod and a change of your pedal ratio.

The stock M/C will be fine with a pedal ratio between 6:1 to 6.25:1.

[golde30]

i have an IX booster/master with my e30 m3 brakes and it feels fine to me. i need to bleed it again, but overall pretty good. when i was running the IXbooster/master with my 4pot wilwood calipers, i could lock up the brakes like half way on the pedal...it was crazy for street, hence why i sold the setup to some1 who was gonna run it on the track.

[RobertK]

Here's a thread on fitting boosters with the S50

http://www.r3vlimited.com/board/showthread.php?t=78855

What Matt meant is that when BMW designed the intake manifold, they most likely optimized the flow characterstics so that each cylinder would receive the right amount of air, and disturbing the internal shape of the manifold can disturb the flow pattern, possibly causing cylinders to run non-optimally.

In practice, it may be possible that the amount of performance lost is negligible, or you could be burning a valve. You can't really know that, because the DME does not monitor individual cylinders for combustion quality or temperature.

I understand that, but if you have seen the mod in person you would understand that the amount of turbulance created is negligible. Plus the mechanic that did this to his car has 30 years of experience working on BMWs with no issues to his S52.

[matt]

If he had 30 years experience with acoustic tuning of intake manifolds, I would buy that.

[rs4pro3]

No, it's not suicide. But it requires a custom mounting plate, push-rod and a change of your pedal ratio.

The stock M/C will be fine with a pedal ratio between 6:1 to 6.25:1.

Ditto, I've got manual brakes on my 85, and did all that, and it brakes just fine, it does take a little bit more effort then stock, but not bad at all.

[thull]

Why would you cut up an intake and put hours into fiberglass work when you can just change a booster? lol

[mattdk318i]

alot of people dont want to compromise the Factory braking setup of their cars.
Because changing boosters does change the way the car brakes, esp a diff diameter diaphram.
But if you are modding brakes as well its not a big deal.(at least to me)

[RobertK]

If he had 30 years experience with acoustic tuning of intake manifolds, I would buy that.

Please, I guess that means Ely's ITB setup is junk beause he didn't "acoustically tune" it.

I have seen plenty of custom intake jobs, lets say I am willing to bet money on the fact that the effect of modding my intake will not have more than a fraction of a percentage on the actual performance of the engine.

I love how people who have never had any experience doing something different are always the first to have an opinion about it.

Why would you cut up an intake and put hours into fiberglass work when you can just change a booster? lol

If it takes you hours to work with fiberglass to do this mod then you have no business working with fiberglass to begin with. Plus $20 in fiberglass / paint or $75-180+ in brake booster? I already have all the tools and fiberglass products left over from my body work so this mod is free to me.

BTW.. http://www.r3vlimited.com/board/show...&postcount=117

[mattdk318i]

Please, I guess that means Ely's ITB setup is junk beause he didn't "acoustically tune" it.

I have seen plenty of custom intake jobs, lets say I am willing to bet money on the fact that the effect of modding my intake will not have more than a fraction of a percentage on the actual performance of the engine.

I love how people who have never had any experience doing something different are always the first to have an opinion about it.