Who says you can't have an emmisions LEGAL 400+RWHP rotary?

[TitaniumTT]

My emmisions is due, again, so I found a shop, not exactely local, about 85 miles away that was sympathetic to my needs. He said as long as he didn't have customers waiting for an emmisions test, I would be able to use the equipment in diagnostic mode with a tech present to do a little tuning and try to get her to pass.

So I spent ~3 hrs of the last few days welding in a new center section for my exhaust that consisted of a Magnaflow hi-flow cat and some other bits. I bought the one with the air injection port already welded so when I have to go back with a working air-pump, it's won't require me to take the exhaust off and weld stuff in, just plumb it up. I didn't replace the precilencer that I have now, I just built an entire new center section. The way my exhuast is set up, there is a flex pipe and the end of the DP with a 3" V-Band welded on. On the other side of the V-Band is a MagnaFlow 3" in 2x 2.5" out and a few bends heading off to the rear cans. Right around the axles there is a second V-Band on each side that seperates the mufflers from the presilencer or cat. I built a new section with the cat between the V-Bands. When I originally bought the pre-silencer, MagnaFlow offered the same case in with a cat installed. They have since stopped offering that so I had to buy a 3"-3" hi-flow cat and a 2x 2.5" - 3" Merge Collector as well as a few other pieces of piping. Either way all I need is my 7/16" subby racheting wrench and 5 minutes and I can swap the center sections out.

True to form, today is the deadline so I went up late this morning :lol: The tech backed the car in, no door dings this time, off to a good start.... although he did stall it FOUR times even after I warned him it was a grabby twin disc clutch, "eh, we deal with those all the time." It's a Rustang/Vette shop primarily. So we started her on the rollers with his foot on the gas and me working the MoTeC. Got her into 3rd gear, as opposed to first and started the sniffer. Ended up pulling about 20% fuel from 1500-2250rpms and right around the 40-60% effiecency mark (roughly the same in kpa) to acheive a L of ~.98. I generally have her running ~.9-.92 in that range.

Someone else showed for a test so we pulled my car out, I was done anyway, pulled a honduh in for the CT Emmisions test and that failed :rofl: then pulled my car back in, again no door dings but one stall.

Here's what happened next -

http://rotarycarclub.com/rotary_forum/attachment.php?attachmentid=6778&stc=1&d=1259009111

:D This was done on regular 93 oct, Idemitsu PREMIX IN the tank mixed at about 1/2 oz/gal AND the OMP working as well. This is more oil than what is recc'd but I was doing some SEVERE back road jaunts yesterday with a few local rotorheads so I added a little extra lube love. No alcohol tricks, no crazy advanced timing, no pumping cubic acres of air into the exhaust, no air pump at all and BOTH tail-pipes being sniffed and she still passed. Who says you can't have a street/emmisions legal 400+ RWHP rotary???

Oh, and the engine survived this time with all her sideseals intack :rofl: Coolant hit 188* and oil hit 170*, hood open, no fans though, but there was a garden hose present that I noticed JIC.

[djmtsu]

Very nice!

[FerociousP]

you are lucky... for emissions in tennessee (where you have emissions) the HC have to be below 220 and we have state run testing facilities (no multiple tests). Ask me how I know?? lol

[TitaniumTT]

That sucks. I could've reduced the hyrdocarbons more if I wanted but I wanted to see where I was at. She was running .97-98L so there's more to be had. Also could've advanced the timing a touch..... new plugs would help that as well.... mine are OLD! and have survived probably 60 dyno pulls.

There are definately ways to legally get through emissions. Remember, this was done SANS airpump. Pumping in fresh air is going to lower ALL of those readings.

[FerociousP]

thats how I passed a '87 na with no emissions....

1) air pump directly to the cat
2) retarded timing as far as I could drive safely
3) 7-8 bottle of ISO HEET on minimum gas,

[Max777]

did you bypass the ACV or just rig it open?

My car stinks, so I was thinking of going with a cheap cat and an air pump.

[TitaniumTT]

ACV? That's cute :lol: No air pump, no ACV, no emissions nothing except for a cat and intimate knowledge of the inner workings of a combustion engine and a hell of an ECU

[rx4ur7]

All my street packages pass close to factory 0 - 0. which can be capable of 435. (all have to maintain factory emission systems as required by ADOT). The Mazda emission system is one of the most efficient out there, that really does not effect performance.

Good work on what you have done, would like to see HC under 100 which with a little work you can do. I have always maintained you can be green and still kick assphalt.

My non-cat, non-TR REPU goes through 56ppm HC .01% CO. with SP, Nikki carb, stock ACV and Pump.

[TitaniumTT]

Nicely done on the REPU! I'm guessing the airpump has alot to do with those numbers being as low as they are?

[Max777]

ACV? That's cute :lol: No air pump, no ACV, no emissions nothing except for a cat and intimate knowledge of the inner workings of a combustion engine and a hell of an ECU

My bad, I was talking about the person that posted before me....

However, what can one do to make their RX smell better? Would a cat alone make sense, or would that be a waste of money?

Atm, I can either go with an RB presilencer, or a cheaper cat, I'm leaning on the side of the presilencer for hp, but also on the side of the cat for stink prevention.

[djmtsu]

However, what can one do to make their RX smell better? Would a cat alone make sense, or would that be a waste of money?


Nuthin you can do to make a rotary smell better. :rofl:

You can however keep a travel bottle of cologne in the car. Thats what I do. The wife loves the smell of CK and high octane.

[Turbo II Rotor]

I envy and hate you at the same time...

[RCCAZ 1]

Nuthin you can do to make a rotary smell better. :rofl:

You can however keep a travel bottle of cologne in the car. Thats what I do. The wife loves the smell of CK and high octane.

This is funny. Yea, running MP only, my wife always knows when I've been out in the garage running the car. The smell permiates everything. Oh well, it's all part of the Rotary POWA experience. ;)

[TitaniumTT]

I envy and hate you at the same time...

lot of that going around lately :rofl:

I was at my buddies condo sometime back in March, we fired her up outside his garage to let her warm up for a few minutes and before we had even finished a smoke his neighbor was outside screaming at us, "you're fuming out all my guests, your're trying to kill us! do you have any idea what it smells like in there!"
Yes, we know what it smells like, we've been out here for 5 minutes
No, No, you should come in here and smell this
We KNOW what it smells like, sorry
blah blah blah more bitching and whining

This is completely ignoring the fact that she'll wheel her harley outside and start it up and let it warm up for a 1/2 hour @ 7:30 EVERY Sunday. I hate hypocrites.

Meh, whatever.

Wasn't there some sort of fuel additive that would alter the scent of the exhaust?

[BigIslandSevens]

There are additives that scent the fumes. We sold it at the m/c shop I worked at. Cotton candy was popular. You'd have to put a shit-ton in to mask our natural scent!

[Turbo II Rotor]

http://www.summitracing.com/search/Brand/Manhattan-Oil/?keyword=fuel+additives

[NoDOHC]

However, what can one do to make their RX smell better? Would a cat alone make sense, or would that be a waste of money?



Nuthin you can do to make a rotary smell better.

You can however keep a travel bottle of cologne in the car. Thats what I do. The wife loves the smell of CK and high octane.


Seriously, Rotaries only smell bad with the stock ECU. I have no cat on my '86 and it will idle smoothly at 14.5:1 and run elsewhere about 15.0:1 and there is no odor at all except if you floor it (then it smells like oil smoke from too much injection due to a modified OMP linkage).

My '91 has a cat and still smells bad.

Congrats on the pass Brian!

[-Six-]

Sucks that you even have to go through all that with such an old car. We don't even need to bother testing them in Illinois, emissions exempt.

[TitaniumTT]

Seriously, Rotaries only smell bad with the stock ECU. I have no cat on my '86 and it will idle smoothly at 14.5:1 and run elsewhere about 15.0:1 and there is no odor at all except if you floor it (then it smells like oil smoke from too much injection due to a modified OMP linkage).

My '91 has a cat and still smells bad.

Congrats on the pass Brian!

Thanks man!

What is your timing and kpa like to run so lean?

[NoDOHC]

Timing is stock (5 degrees ATDC L, 20 degrees ATDC T)
It runs about 50 kPA of vacuum with the timing retarded that much.

I can't go much lean of 13:1 without retarding the timing a lot (it actually uses less fuel to idle with 10 degrees BTDC timing though, because it is running 70-75 kPA of vacuum).

I couldn't really get the idle smooth without retarding the timing, it idles like a weedwacker with normal timing numbers.

Actually, I use the pit in my timing map to stabilize the idle. The timing increases gradually below 1000 rpm and above 1500 rpm, this means that the engine gains power as the revs drop below idle (when engaging the clutch), giving a little bit of stability (improves driveability).

I wish I could idle closed loop, but I still haven't gotten that to work smoothly (probably need more timing retard).

[TitaniumTT]

Interesting. Thanks for that. I'm sure I'll be playing around with the idle again in the spring with the new injectors and the coils.