E36 M3 open header , no exhaust w/ vids

[BrodsterM3]

two videos of the gauge cluster during accel with no exhaust except for the stock headers... it was LOUD!

0-100mph
http://img.photobucket.com/albums/v624/MPOWER/1997%20BMW%20M3/M3%20Videos/th_NoExhaustRev-100mph.jpg (http://smg.photobucket.com/albums/v624/MPOWER/1997%20BMW%20M3/M3%20Videos/?action=view&current=NoExhaustRev-100mph.flv)



0-140mph
http://img.photobucket.com/albums/v624/MPOWER/1997%20BMW%20M3/M3%20Videos/th_NoExhaust0-140mph.jpg (http://smg.photobucket.com/albums/v624/MPOWER/1997%20BMW%20M3/M3%20Videos/?action=view&current=NoExhaust0-140mph.flv)



i took the M to a local independant auto repair shop to further investigate my "clogged exhaust" issue... they didnt charge me anything for the use of one of the lifts and an infared heat gun :buttrock

so the car was good and warmed up, cats should be at temp and working. i checked the temp of the exhaust tubing just before the cat and it was 225 and then checked it after the cat and it was 215. it was the same on both left and right sides. Am i wrong, or shouldnt the temp of the exhaust tubing after the cat be atleast 100 degrees hotter than before the cat?

[Studie]

i've driven my car only with the headers and it was deafening. i don't know how you took it up to 140. a cop would be able to hear it from 10 miles away!

[RahgBag]

Sounds pretty damn mean.

[Schnell325]

Sounds really aggressive....I approve of this video

[E36 PWR]

Sinister

[wheresmym3]

Why would it be hotter after the cat?

[rubberdub]

Oh my God! I just soiled my pantaloons!

[dmess]

OMG that was awesome

[smocan]

I need some vids from the outside of the car... sounds good

[///M3Augy]

That is loud. haha

[mikese36]

Sounds Great!

[Mooseiah]

Wow, that sounds similar to my kit car which has a supercharged v6.

[JohnnyBgood95]

Sounds sweet, did it pull any different w/o the exhaust?

[ducky328i]

lol...look at your trip odometer...it only took you a mile to get to 140...sry...just noticed that. car sounds effin sick!!!

[jasont77]

sounds like a beast on idle...

[jszy25]

Why would it be hotter after the cat?

Yea I am curious as to why it would be hotter post cat myself??

[ducky328i]

since the cat is restrictive, exhaust gases get concentrated in that area raising the temperature there and throughout the rest of the exhaust system...

dont know that for sure but it seems like a reasonable explanation to me...

[BrodsterM3]

there was a noticable drop in low rpm torque, the car really wanted to stall when i let the clutch out. it's hard to say how much better it pulled at the top of the rpm range with just the seat dyno.



i will try this test when i can get my hands on a vacuum gauge tomorrow.

"To diagnose a plugged catalytic converter, you can check intake vacuum or exhaust backpressure. To check intake vacuum, connect a vacuum gauge to a vacuum port on the intake manifold. Start the engine and note the vacuum reading at idle. Then increase engine speed to about 2,500 rpm and hold steady. Normal vacuum at idle for most engines should be 18 to 22 inches Hg. When the engine speed is increased there should be a momentary drop in vacuum before it returns to within a couple of inches of the idle reading. If the vacuum reading is lower than normal and/or continues to drop as the engine runs, it probably indicates a buildup of backpressure in the exhaust. Remember, though, that intake vacuum can also be affected by retarded ignition timing and valve timing. What's more, some engines are much more sensitive to small changes in intake vacuum than others, so checking backpressure rather than intake vacuum may give you a better indication of what's going on."

[HulkManJ99]

definatelt sounds mean

[Bsaint]

hahahah nice job man lol I don't know what to think lol

[NHbmw325I]

That sounds pretty mean, an outside vid of the car might have been cool.

[BrodsterM3]

hahahah nice job man lol I don't know what to think lol

i'm not sure if that's a compliment, but thanks. atleast you got a laugh out of it :D mine should sound just like yours once i get my exhaust finished...:evil2

I'm guessing you are in 2nd gear in this clip?
http://www.youtube.com/watch?v=Bu_OCQkS4cw

[Eric BMW]

Scandalous.


More and more everyday I take boost for granted.

[Bsaint]

i'm not sure if that's a compliment, but thanks. atleast you got a laugh out of it :D mine should sound just like yours once i get my exhaust finished...:evil2

I'm guessing you are in 2nd gear in this clip?
http://www.youtube.com/watch?v=Bu_OCQkS4cw

im not sure either hahah well thats good atleast! and yeah it was second :) 1st spins to much and I actually would have spun a bit there if my tire pressure wasn't so low.

[BrodsterM3]

Scandalous.


More and more everyday I take boost for granted.


haha, i wish i was boosted too!
i love how the 0-140 mph clip sounds like the car is FI cause of the "WOOSH" sound.

[BeastinM3]

Makes it sound mean as hell.

[Bsaint]

haha, i wish i was boosted too!
i love how the 0-140 mph clip sounds like the car is FI cause of the "WOOSH" sound.

yeah i was going to ask about that lol

[StoRm.328i]

I blew my speakers when listening....

[Inv3ctiv3]

So you didn't have your cats either? I have heard it is very bad to run a car with absolutely no exhaust like that....I was told it damages the valves because there is no back pressure.....

[BrodsterM3]

I was told it damages the valves because there is no back pressure.....

not true. especially if it was just for a few miles

[ZbmwR]

soooo loud

[Inv3ctiv3]

not true. especially if it was just for a few miles

Really? Hmm the guy that was explaining to me said it can damage it just revving it for a few seconds and he owns a local engine shop *shrugs*

[Petrucci]

Where are you driving like this in Chandler?

[Bsaint]

So you didn't have your cats either? I have heard it is very bad to run a car with absolutely no exhaust like that....I was told it damages the valves because there is no back pressure.....

+1 it can without a properly tuned car, I deff wouldn't try it.

[BrodsterM3]

Where are you driving like this in Chandler?

on Gilbert Rd. south of Hunt Hwy. it's flat and straight, un-occupied indian reservation land.


and i know for a fact that no physical damage was done to any part of my engine by doing this ;)

[Inv3ctiv3]

on Gilbert Rd. south of Hunt Hwy. it's flat and straight, un-occupied indian reservation land.


and i know for a fact that no physical damage was done to any part of my engine by doing this ;)

Ok I was just asking......

[MeFryRice]

So you didn't have your cats either? I have heard it is very bad to run a car with absolutely no exhaust like that....I was told it damages the valves because there is no back pressure.....

I've heard that also and keeps me from doing the same.

[BrodsterM3]

I've heard that also and keeps me from doing the same.

i dont know why. we have test engines at work that have been running without any exhaust at all, not even manifolds... with no damage occuring.

[Juliflex]

sounds mean... i like it

[Petrucci]

on Gilbert Rd. south of Hunt Hwy. it's flat and straight, un-occupied indian reservation land.


and i know for a fact that no physical damage was done to any part of my engine by doing this ;)

Ahh ok I know where that is. Nice out there I forgot about that area.

By the way your car sounds sick.

[Inv3ctiv3]

i dont know why. we have test engines at work that have been running without any exhaust at all, not even manifolds... with no damage occuring.

Depends on the motor.

[Eric BMW]

Ruins VE probably.

[BrodsterM3]

Ruins VE probably.

VE? volumetric efficiency?

[bennyfizzle]

exactly :rofl

[bmwftw]

http://media.putfile.com/I-guess-its-fast