P5 NA Build - Target 175whp

[LordWorm]

If it's under the headlight it's a CAI not a short ram

he said BEHIND the intake, not under it.
anyway, an sri needn't cop a huge heat soak from the engine - you just need to be smart about how you do it. shielding to prevent hot air being blown over the filter by the radiator fans - correct placement to keep it away from any major heat sources... when parked it'll heat load , but it'll cool off quite quickly once you stab the throttle. you can also run an sri with an airbox and cold air duct if you want - best of both worlds.

The benefit of an sri is obviously throttle response, and way cooler induction noise.

 

[Sleepy]

Something I've always wondered is why is it called a ram intake when there is no ram effect where it's placed?

 

[br289165]

So you're saying an SRI is better for hp than a CAI right.

he said BEHIND the intake, not under it.
anyway, an sri needn't cop a huge heat soak from the engine - you just need to be smart about how you do it. shielding to prevent hot air being blown over the filter by the radiator fans - correct placement to keep it away from any major heat sources... when parked it'll heat load , but it'll cool off quite quickly once you stab the throttle. you can also run an sri with an airbox and cold air duct if you want - best of both worlds.

The benefit of an sri is obviously throttle response, and way cooler induction noise.

 

[LordWorm]

So you're saying an SRI is better for hp than a CAI right.

that's not what i said at all... its impossible to say one will make more power than another - theres plenty of variables - does the short ram duct cold air? does it have a ram scoop? is it tuned length (which would also require a specific intake manifold design to take advantage of)...etc etc etc.

better for throttle response no doubt...better for horsepower - would depend on a great number of things.

 

[br289165]

You're definitely the theory guy

that's not what i said at all... its impossible to say one will make more power than another - theres plenty of variables - does the short ram duct cold air? does it have a ram scoop? is it tuned length (which would also require a specific intake manifold design to take advantage of)...etc etc etc.

better for throttle response no doubt...better for horsepower - would depend on a great number of things.

 

[LordWorm]

You're definitely the theory guy

i've tested the "theory" a few times at the track - i've run a cold air system for a handful of runs (with no filter), then ripped the whole intake system off and gone with a a bare, naked, open throttlebody...and gone faster with just the throttlebody sucking air from the back of the engine bay. I taped the air temp sensor near the opening to the throttle, and checked the data logs and saw a negligable increase in intake temps.... in a real world scenario though, this wouldn't stack up - i cool the motor after every run, the motor isn't started until just prior to the run etc, so huge amounts of engine-bay heatsoak isn't a concern...i also disable the cooling fans for all my runs....

like i said, lots of variables - i feel the best solution would be a well designed, well matched short ram, in a custom made airbox with decent thermal mass (thick aluminium, or stainless steel), with a cold air duct feeding the cold air box... that way you get the best of both worlds - nice cold air, and ultimate throttle response.

as to why its called a short RAM intake, when theres no ram air effect - i think the term comes from the old "tunnel ram" intake manifold setup, which uses a tune length intake pipe and helmholtz resonance to fill the plenum. These intakes have notoriously short intake tracts and do help the rest of the "tunnel ram" intake manifold to built positive pressure, without using a ram scoop. I've discussed the design of a manifold like this in other threads and wont go into it here as it will further derail jimmy's thread

 

[dxaveP5]

^^^^ thats my setup and its great.

Subbin

 

[Tom03es]

If you search the BMW forums, a DIY cold air box is one of the first recommended mods.

 

[Hughes412]

Well, first off congrats if you got married already. I just went through this whole thread (jumping around posts, I know whos to read) and all I can say is Im jealous! This is exactly what I was wanting to do but I got the bit by the JEEP bug. I still dont see a VIDEO, I know you are probably tired of hearing that but come on already. LOL

 

[CulRidr]

Updates?
And a question while I am here...Is there any chance of the higher lift from the cams combined with the higher compression piston profile creating piston slap, or is the engine still considered non-interference even with both of these mods together?

 

[jimmysuite]

more updates coming "relatively" soon.... I have been watching this project develop for almost two years. A couple more months won't kill me.


I belive with the twiggy cams the fsde turns into an interference motor. It's only an issue if you break a timing belt. I had the timing belt replaced when the work was being done.

some good info here....

http://www.mazdas247.com/forum/showthread.php?t=123664011&highlight=interference&page=14

 

[jimmysuite]

I'm planning on going to Wisconsin international reaceway next week friday. should be able to get some good pics and video. I'll be sure to post times and such.

 

[bbell1984]

ECU update

Hey, just an FYI, if you check out the torontomazda3.com forum, you'll see that a guy from quebec just figured out a ecu update and a guy from the toronto forum made some nice gains and he is only running an CAI, headers and exhaust.
The update is apparently a learning program so while you make mods it keeps learning your engine and making gains. anyway check it out it might help you make your goal

payce
b

 

[CulRidr]

He has a standalone, so that will be much more useful to him. However, I will be using a reflash from that guy

 

[br289165]

All of the sudden he discovered that right? Go Wings

Hey, just an FYI, if you check out the torontomazda3.com forum, you'll see that a guy from quebec just figured out a ecu update and a guy from the toronto forum made some nice gains and he is only running an CAI, headers and exhaust.
The update is apparently a learning program so while you make mods it keeps learning your engine and making gains. anyway check it out it might help you make your goal

payce
b

 

[CulRidr]

All of the sudden he discovered that right? Go Wings

No actually he's developed the reflash method over the last while with some expensive equipment. He's flashed MZ3s, RX8s, MS3s, and is working on my Proteg.

 

[Sleepy]

Wow a reflash would be nice. How comprehensive is it? rev limit, bigger MAF etc?

 

[CulRidr]

Pretty much whatever you want. I'm going to be talking to the guy for my 2nd reflash once the engine is broken in. The 1st flash will only be to get me around without stalling (or blowing) and whatnot with the bigger cams and higher compression.

 

[MakeMeGoFast]

I'm planning on going to Wisconsin international reaceway next week friday. should be able to get some good pics and video. I'll be sure to post times and such.

 

[jimmysuite]

I posted the times but unfortunately went by myself. (friends bailed) so no video or pics.