removed the cat, what a difference

[mmtphoto]

my 88 daytona shelby z which I bought new in 87, is pretty much original-right down to the cat, and today I sawed it off, and put in a pipe in it's place-now, it seems to idle smoother, and pulls much harder-boost goes easily to 12-13 lbs where before it was 10-12 lbs. This car sat for about 4 years in my garage when the original turbo began to leak oil internally, and I now have a new turbo in with a new wastegate-I still have small things to correct, noises, and small tirim things, but it only has 76,000 miles and runs almost as good as the day it was new-since I generally drive less than 5000 miles a year, it does not need emissions, so I am thinking of doing away with the evap canister, and anything else that is unnecessary-ideas? thanks

[Screamin4banger]

Quote:

Originally Posted by mmtphoto I am thinking of doing away with the evap canister, and anything else that is unnecessary-ideas? thanks

Define unnecessary.

To some people, a speedo is unnecessary. Gut the interior down to the sheetmetal - leave the seat, shifter, and steering column. Pull the dash out and fab up some brackets to mount a piece of aluminum so you have somewhere to put your Tach, EGT, boost gauge, and WBO2. With the interior out, there will be plenty of room for a cage. Don't forget the fire extinguisher.

[gkcooper]

That evap cannister improves driveability and MPG. I would not remove it.

[mmtphoto]

Quote:

Originally Posted by Screamin4banger Define unnecessary. To some people, a speedo is unnecessary. Gut the interior down to the sheetmetal - leave the seat, shifter, and steering column. Pull the dash out and fab up some brackets to mount a piece of aluminum so you have somewhere to put your Tach, EGT, boost gauge, and WBO2. With the interior out, there will be plenty of room for a cage. Don't forget the fire extinguisher.

I could remove the rear wheels, and just center one that i could use as a rudder-ya know, lock the front wheels so that it becomes a trike-remove the headliner (who needs that, it has a roof)-lights? street lights most place I go, I'll take my chances where there aren't any (especially if you are coming toward me)-

Actually, I was referring to emissions that will not be an issue if there is no visual, and no sniffer-so, duh, unnecessary emission stuff-without your's, that is..thanks for the wise-ass reply, now I know it is just the way you are to everyone-and it certainly shows that things have to be explained to you. Not any mystery there, scream boy.

[mmtphoto]

Quote:

Originally Posted by gkcooper That evap cannister improves driveability and MPG. I would not remove it.

why does it improve driveability? because it introduces fumes into the intake? How is that a significant contributor to MPG and driveability? thanks

[mmtphoto]

bump^

[allmotor]

Quote:

Originally Posted by mmtphoto I could remove the rear wheels, and just center one that i could use as a rudder-ya know, lock the front wheels so that it becomes a trike-remove the headliner (who needs that, it has a roof)-lights? street lights most place I go, I'll take my chances where there aren't any (especially if you are coming toward me)- Actually, I was referring to emissions that will not be an issue if there is no visual, and no sniffer-so, duh, unnecessary emission stuff-without your's, that is..thanks for the wise-ass reply, now I know it is just the way you are to everyone-and it certainly shows that things have to be explained to you. Not any mystery there, scream boy.

evap has zero,no, nada effect on fuel mileage or driveablitily. egr does increase fuel milage. egr lets the engine run leaner - better mpg- but cools combustion to reduce detonation- very bad effect of a lean a/f mix. egr only comes on during hot cruise.

[mmtphoto]

Quote:

Originally Posted by allmotor evap has zero,no, nada effect on fuel mileage or driveablitily. egr does increase fuel milage. egr lets the engine run leaner - better mpg- but cools combustion to reduce detonation- very bad effect of a lean a/f mix. egr only comes on during hot cruise.

So, removing evap will not have a neg impact on driveability or economy. and all I have to do is live with whatever codes it might set-right?

also, i would think that introducing exhaust gas (egr) into the intake would increase intake temp-not reduce it (especially an intercooled engine, not running boost except when beating on it). In the past, anything that used engine vacuum was considered a parasite, some things you had to have like power brake booster, heater controls, , but others just robbed power. I understand that a computer controlled engine will need input within perimeters that are set on it's tables-I am just interested in the things that would not necessarily affect driveability, fuel economy, reliability-if the vapor canister is a good candidate to join the cat on the shelf in my garage, that's really my question.

[allmotor]

u obviously slept thru hs chemistry class or never welded with mig. if u can answer this question, u would understand how egr cools combustion temps. what are the 2 primary incredients of exhaust gas (besides nitrogen)? egr only comes on during hot cruise when power is not an issue, this allows stragies to lean a/f mix reducing fuel consumption. however when u go lean 2 neg things happen. detonation is one, the other is the formation of nox emissions.

evap sets no codes what so ever pre 1996. - except neon 1994+.

[speeduphoria]

keeping oil out of your intake from the stock PCV setup would increase MPG. As does EGR as stated, or convert to direct injection to run it super lean, lol

[mmtphoto]

Quote:

Originally Posted by allmotor u obviously slept thru hs chemistry class or never welded with mig. if u can answer this question, u would understand how egr cools combustion temps. what are the 2 primary incredients of exhaust gas (besides nitrogen)? egr only comes on during hot cruise when power is not an issue, this allows stragies to lean a/f mix reducing fuel consumption. however when u go lean 2 neg things happen. detonation is one, the other is the formation of nox emissions. evap sets no codes what so ever pre 1996. - except neon 1994+.

taken from a research site on the internet-if you read what I wrote, it does not address the fact that the role of deluding the quality the mixture helps emissions-I said that egrs increase the intake temperature, period. If I fell asleep in class, you were probably the lecturer.

EGR use often causes an increase in the intake temperaturel. EGR cooling is employed in engines to minimize this temperature increase, but the heavy EGR flow rates required for NOx control (often greater than 50%), particularly at high engine load, can cause significant temperature increases. As a consequence, the charge-gas temperature at the time of combustion is higher than conditions without EGR. Another consequence of heavy-EGR use is that intake pressure is increased (through turbocharging or supercharging) to deliver needed oxygen in-cylinder as a means of compensating for the oxygen that was displaced by EGR

Somehow, I managed to MIG weld a pipe in place of the removed cat this afternoon, in spite of your evaluation of my knowledge of the laws of physics. I'll suggest that you missed reading comprehension classes in grammer school.

[Sittn86]

I think both of you failed many spelling tests, as well as GRAMMAR tests.

[Screamin4banger]

OK I was joking around about stripping the car - when you got a taste of speed, you wanted more and talked about removing stuff... I just went with it

As far as "emissions equipment" - leave it alone unless you plan on changing a bunch of stuff. Removing your canister wont make you run better or go faster unless you coincidently have a vacuum leak or something between it and the rest of the system.
All you need to care about EGR is it reduces combustion temps and thereby reduces detonation and NOx. Back in the v8 carburetor days it was business as usual to pull the intake and block of the EGR passages cause they ran under the intake (simply removing the valve wasn't the point). Fuel injection made that all irrelevant... just leave it alone unless you got a real reason for removing it.

I'm just trying to save you the time of writing one of those "My car doesn't run right after I F'd with it" threads.

[mmtphoto]

Quote:

Originally Posted by sittn86 I think both of you failed many spelling tests, as well as GRAMMAR tests.

OMG, it's the GRAMMAR NAZI-shouldn't you get back to trolling your local Craigslist?

And, Scream, I hear you-I really am just thinking out loud, hacking off the cat yesterday and dropping the ugly 15 lbs, getting a little more boost, just wondered about what else...ya know. Actually, even though I'd like to run 25,000 lbs. of boost, I've had this car for 20 years and resist going overboard. Not worth blown headgaskets, cracked/broken pistons, axle/cv joints, not to mention tickets.

If anyone out there needs help with proofreading, I'm certain Sittn 86 (you are aware your name is somehow defective with regards to speling, aren't you?) is willing to help out.

[Sittn86]

I saw a micro flamefest going on, so I figured I'd jump in. It was a stupid joke. Don't be so defensive. Yes, I realize my name is not spelled properly; I did that intentionally.