Pass WA emisisons with a carb?

[lamrith]

Hey all. Have a vehicle that is a '89. I am putting a 5.0 into it and I am wondering if I can pass emisisons with a carb? I know we do not have visual impsections. I will use a Edelbrock Vac secondary, probably 600cfm range. I will be running stock 5.0 shorties, and h-pipe with cats and dual exh with some stock type mufflers. I believe emisisons levels are based off the year of MFG on the chassis? I don't know of any vehilcles in '89 NOT being EFI..

Does anyone have any experience with getting a rig to pass emissions with a carb? I would like EFI, but the Carb would be MUCH simpler to wire up and get running in a short amount of time.

 

[gospeedgo]

You can get it to pass, but without the smog pump it will be difficult. Throw a smog pump on it and pipe it directly to the cats, it will super heat them and with a good lean tune it should pass.

 

[lamrith]

That will work? I have all the brackets and a smog pump from the donor motor. I just didn't/don't have the EFI stuff. HRMM Carb will be cheaper in the short run and easier to get running.. Might just have to give it a shot and see what happens.

Anyone got a 4bbl intake for a 302/5.0??

 

[89MustangGX]

You shouldn't have any problems passing as long as the engine is in good tune and you have cats on it. Other emissions equipment is not necessary as long as the car is up to temperature and not running too rich.

My 88 went through CT emissions fine a couple times and that was the same as it is here. That car had nothing except high-flow cats on it for emissions (no EGR, etc.). It was also a fairly healthy combo with a 650 Double Pumper on top. I had to lean out the idle air/fuel until it was stumbling and barely running, but then it went right through.

 

[gospeedgo]

Try it without first, but it only takes a little bit to instal and will clean up the numbers a ton. Cats dont work very well until they get hot...and thats the easiest/best way to do it.

 

[AllFordPerf]

Speeds right. We just passed an 85 this week with only 20 on the HC! Using an Edelbrock 600 carb.

 

[84Gt350]

I have had my carbed 5.0 for 15 years and the carb isn't the reason it may not pass the test, it's the cam. What cam are you running? A properly jetted carb runs the same A/F ratio as injection. When you are up and running get on a wide band dyno and check the cruise speed jetting and mixture not just the wide open reading, the main jets are adjusted to get the part throttle mixture correct. The idle mixture needs to be pretty lean to pass but you can readjust that after the test. You will need a distributor out of a 85 GT as it is the only year set up for a roller cam and vacuum advance. Good luck. I passed many times without cats as they dont change the CO, I run them now so I don't stink up the garage.

Dan

 

[89MustangGX]

I have had my carbed 5.0 for 15 years and the carb isn't the reason it may not pass the test, it's the cam. What cam are you running?

I see you're running a fairly large cam, here's the cam I was running as well:

Wolverine 1087 Cam (289º 299º 222º 232º 0.510'' 0.534'' 112º)

 

[lamrith]

My motor will be a bone stock '91 5.0 from a LX mustang, so nothing radical.

I think $4 wise I can find stock stuff so cheap it is a wash EFI Vs carb. The carb is much easier to install, but the EFI has the advantage is very easy and smooth running year round and better fuel mileage.

 

[84Gt350]

My car won't pass with the X cam so I have it registered at my sisters in Stanwood. Thats why I asked what he is running.

Dan

 

[gospeedgo]

I passed many times without cats...

the only way I have ever heard of doing that is with a $50 tune. Paid directly to the people running the test.

 

[Mosix]

Here in Oregon we have made several carb conversions work with DEQ, even on the dyno, 81-95 year cars. Gospeed is right, the key is the cats and the air pump to keep the cats lit and burning.

Glenn

 

[89MustangGX]

My car won't pass with the X cam so I have it registered at my sisters in Stanwood. Thats why I asked what he is running.

Dan

Seems strange. I was running the Wolverine cam, ported/milled RPM heads, RPM intake, 650 D/P, all good ignition, BBK L/T's and cats.

I was trying to demonstrate that you can pass with aftermarket parts.

I'm not sure why this whole thing with the air pump is coming up, it certainly is not necessary, nor difficult to pass without. I haven't had one on any of my Mustangs for years and never had any problems (including all of the different things I've done with them). And no, I've never had to replace clogged cats or anything. In fact, last time I tested, I compared one of my Mustangs with aftermarket cats and no air pump and it burned cleaner than all of my parents newer cars/trucks.

 

[lamrith]

89Mustang - What year cars have you had tested?? I believe there are different limits for the diffrent years, that is my biggest concern..

I am leaning fairly strongly toward teh carb now as it is just so much easier to hook-up.

 

[89MustangGX]

89Mustang - What year cars have you had tested?? I believe there are different limits for the diffrent years, that is my biggest concern..

They are 87, 88 and 89's.

 

[gospeedgo]

I'm not sure why this whole thing with the air pump is coming up...

It is coming up because it is the easy way to light up the cats, so they can do their job. If you cant pass without the pump, hook one up and chances are it will. Nobody said necessary, but if he has the parts why not do it right once instead of spending time scratching his head. Its a very simple device, and helps clean it up a ton. Its just advice, take it or leave it, but dont bash it...it works.

FWIW....i dont have one on my car either, and it passes just fine. It is in extreme cases (like carbs!) that it helps the most.

 

[89MustangGX]

It is coming up because it is the easy way to light up the cats, so they can do their job. If you cant pass without the pump, hook one up and chances are it will. Nobody said necessary, but if he has the parts why not do it right once instead of spending time scratching his head. Its a very simple device, and helps clean it up a ton. Its just advice, take it or leave it, but dont bash it...it works.

FWIW....i dont have one on my car either, and it passes just fine. It is in extreme cases (like carbs!) that it helps the most.

Well, I never said it didn't work -- I KNOW they do something. But saying it's difficult to pass without one I don't agree with -- and since you don't have one either you should know! We're talking carbs here, and that's what I'm talking. I've been there, done that -- more radical setup than he's talking, so that's where my advice and experience is coming from.

I'm sure you could do something like weld in some extra cats too and super-clean the exhaust, but if you can pass without, why bother? That's where I'm coming from -- I like the "Keep It Simple" philosophy.

 

[lamrith]

I greatly appreciate all the input!!

I will have to block off the ports from the cats to the pump anyways so I think (room permitting) I will just plumb it in and see what happens..

 

[blkhorse]

they needed the air pumps on the old dual catalyst cats,all new cats are triple so the extra air needed to burn the uburned fuel(supplied by the pump) is no longer needed.

 

[SMOKEDYA]

larry in wa. they go off of whatever is the newest (engine or car) i have some pics. for you of that intake we have for sale so email me at [email protected] so i can send them to you we'd prob. settle for around $200 or so. but maybe we can meet half way this time? what car do you have now youre tinkering with ?? the truck ? peace





john