Will a Stroker Pass Smog?

[mr.vang]

i'm in with this. the more infos the better

[ForcedFirebird]

Generally a more efficient motor will pass even better. We shut the EGR off when we tune GM cars and they still pass.

As mentioned the overlap of the cam will get it closer to not passing, but a good cat should help.

When there was emissions in FL guys used to drill tiny holes in the top of the muffler or cat so fresh air was drawn in to help. Lean won't do it either, they are probably looking for all kinds of gasses, not just unburned fuel, nox etc.

[matt0300]

Really? Lol

[Jaxx_]

ha ha, I love you. Are you free right now? Can you come over and have a beer. I just got a new case of red strip..
We can get tippsy and half naked in my garage than you can brake out the smog info you got and show me how to tune my stock motronics and show me were the usb plugs into my 173 chip :up:

But really, I'm just woundering if the incease in displacement will push me out side of the smog limits

I myself am almost to dense to read as well, so a simple: Yes your fine, or
No dumbass sell your car and walk. Is all I'm looking for.. thanks:mrgreen:

basically, you need to tune for it, plain and simple. You might be able to pass smog without tuning, but it depends how lenient they are. On that page there is a table of modifications for tuning to adjust one way or another for emissions -- examples like advancing/retarding timing and enriching and leaning the mixture.

get yourself and EEPROM and I'm sure we can figure out how to plug a USB into a 173 dme. ;)

[MonkeyMadness]

I don't think you actually read my previous post, or at least comprehended it. Why would it matter what you're putting into the motor? "Herp a derp I'm gonna list a bunch of parts that have nothing to do with what truely deals with emissions" the simple fact is it's tuning and that's all. If you can't get a car to pass emissions with a normal compression ratio and a mild cam, there's something wrong. This is why I was telling you to start reading. Smog comes down to tuning and nothing more. As long as you have a motor that isn't running a 360 degree cam and 25:1 compression ratio you shouldn't have much of an issue. As I mentioned, just running 17lb injectors doesn't mean you will pass smog because it's lean. Your concept of passing smog is on the completely wrong foundation.


http://www.megamanual.com/ms2/tune.htm#emissions read this and then you'll get a vague idea. You should probably read it twice or thrice, it is pretty dense material.

ha ha, I love you. Are you free right now? Can you come over and have a beer. I just got a new case of red strip..
We can get tippsy and half naked in my garage than you can brake out the smog info you got and show me how to tune my stock motronics and show me were the usb plugs into my 173 chip :up:

But really, I'm just woundering if the incease in displacement will push me out side of the smog limits

I myself am almost to dense to read as well, so a simple: Yes your fine, or
No dumbass sell your car and walk. Is all I'm looking for.. thanks:mrgreen:

[Jaxx_]

btw, don't take my attitude personally. I'm just sick of so many r3vtards. :)

[Jaxx_]

[/B]

Dude WTF are you talking about..?
Never mentioned dumping a ton of money into the motor or associating it with passing smog if I did so...



Thank you!
This is all I was looking for.. now was that hard?:loco:

I don't think you actually read my previous post, or at least comprehended it. Why would it matter what you're putting into the motor? "Herp a derp I'm gonna list a bunch of parts that have nothing to do with what truely deals with emissions" the simple fact is it's tuning and that's all. If you can't get a car to pass emissions with a normal compression ratio and a mild cam, there's something wrong. This is why I was telling you to start reading. Smog comes down to tuning and nothing more. As long as you have a motor that isn't running a 360 degree cam and 25:1 compression ratio you shouldn't have much of an issue. As I mentioned, just running 17lb injectors doesn't mean you will pass smog because it's lean. Your concept of passing smog is on the completely wrong foundation.


http://www.megamanual.com/ms2/tune.htm#emissions read this and then you'll get a vague idea. You should probably read it twice or thrice, it is pretty dense material.

[MonkeyMadness]

"in my opinion" you need to read more and understand that passing smog isn't always a correlation to how much money you've dumped into an engine.

Dude WTF are you talking about..?
Never mentioned dumping a ton of money into the motor or associating it with passing smog if I did so...

I think it will pass easily if you're not touching a cam.

Thank you!
This is all I was looking for.. now was that hard?:loco:

[Jaxx_]

I think half of you guy may not get what I'm looking for..
Sorry it my be my fault for not explaning it well..

If I was to take a bone stock m20b25 that smogs with flying colors
Then pull just the 2.5 crank and rods, and replace them a m52 crank and eta rods and shaved "stock 2.5" pistons and thrown on the smog machine
would it pass??

I'm not going to be driving it all over hell and back.. or making passes on it..
Just a idle and 25mph in 3gear smog test..

would it "in your opinion" pass??

thanks

"in my opinion" you need to read more and understand that passing smog isn't always a correlation to how much money you've dumped into an engine. I think it will pass easily if you're not touching a cam.

[MonkeyMadness]

no just a rebuilt 2.5 with stock overbore. PO did some work tho. i know the AFm has been adjusted , DME wires tapped into , chipped DME , kill switch tapped in the DME...

wow sounds kinky..




---------------------------------------------------------------

I think half of you guy may not get what I'm looking for..
Sorry it my be my fault for not explaning it well..

If I was to take a bone stock m20b25 that smogs with flying colors
Then pull just the 2.5 crank and rods, and replace them a m52 crank and eta rods and shaved "stock 2.5" pistons and thrown on the smog machine
would it pass??

I'm not going to be driving it all over hell and back.. or making passes on it..
Just a idle and 25mph in 3gear smog test..

would it "in your opinion" pass??

thanks

[e30trooper]

Are you running a 2.8?

no just a rebuilt 2.5 with stock overbore. PO did some work tho. i know the AFm has been adjusted , DME wires tapped into , chipped DME , kill switch tapped in the DME...

[MonkeyMadness]

i need to smog my car soon. not sure how its going todo. Still got the stock CAT , but i have a chipped 153 , runs a lil rich.. When i put in a 173 dme i get a CEL with code 1444. Not sure if i should "pass it" or see if it really does pass.

Are you running a 2.8?

[e30trooper]

i need to smog my car soon. not sure how its going todo. Still got the stock CAT , but i have a chipped 153 , runs a lil rich.. When i put in a 173 dme i get a CEL with code 1444. Not sure if i should "pass it" or see if it really does pass.

[MonkeyMan]

I have a mild stroker (76.8mm crank from Euro 323i) with a cam from the same car -- it passed smog, but barely (the cam has more valve overlap than the stock 325i cam, so the HCs were a bit high on idle)...

Theres 2 types of smog tests in Cali: the drive test and the 2-speed test..
the drive test doesn't measure idle emissions, but instead while driving within a certain rpm range and speed..
the 2-speed test measures both idle and driving emissions..

From what I learned, depending on what city or town your car is registered in will determine what type of test you get... the more rural areas will get a 2-speed test whereas the city cars just get the drive test..

I got lucky - my car is registered in a city, so I got the drive test.. it would not have passed if idle emissions were measured.

So yea - the stroker itself shouldn't affect anything as long as its properly tuned; a cam will definitely influence the readings though..

[Jaxx_]

sounds like a bad plan to me. Even megasquirt plug and play would be better plan i think. Running lean doesn't mean it's going to pass smog. It's a sweet spot. Do they do rolling road tests as well? You're talking about running a map for a motor about 11% less volume.