[Diy_efi] Smog pump and emissions testing question...

[Kelley, Damon]

The operators are terrible. If the car is a manual, they may not dyno it be=
cause they can't shift correctly. They gave up on the shelby because with a=
 quick turbo they couldn't come close to following their little graph. Then=
 they just tail pipe it. But yes, slamming the throttle will most definitel=
y occur, but the blow off sounded good in the little building, scared the o=
perators though.

Damon Kelley (in maryland)
87 Shadow ES, 13psi, Cold-Air
89 CSX #208, (Awaiting 16 Valves)
96 CBR600F3, Turbo In Process
03 Durango 5.9

> -----Original Message-----
> From: Brian Renegar [mailto:thomas.renegar at nist.gov]
> Sent: Monday, April 28, 2003 3:12 PM
> To: List for general do-it-yourself EFI talk
> Subject: [Diy_efi] Smog pump and emissions testing question...
>=20
>=20
> I've got emissions testing coming up for my 91 Mustang.  Here=20
> in Maryland,=20
> they do the "road dyno" testing now.  I'm trying to prepare and have=20
> everything tuned properly so it will pass.  The engine is=20
> fully built with=20
> twin turbos.  The thing I'm worried about the most is the=20
> cam, which is a=20
> Motorsport F303.  This particular cam is not "emissions=20
> legal", however=20
> that doesn't mean it won't pass.  I've passed with another=20
> Motorpsort cam=20
> (E303), which has more overlap than the F cam does.  The F=20
> cam, however,=20
> has more lift (.512 versus .498) and more duration (I forget=20
> those specs),=20
> and I don't know how that affects emissions.
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> So anyways, the other issue is that I have removed the smog=20
> pump and all of=20
> it's associated tubing and vacuum solenoids.  I was planning on just=20
> installing the pump and running the hose directly to the=20
> exhaust, since=20
> that's what the computer's strategy would be during warm=20
> operation.  However, I just had an interesting conversation with a=20
> friend.  He suggested instead of running the tube down to the exhaust=20
> H-pipe, to run it to the back of the cylinder heads (which is=20
> the other=20
> location the factory setup runs the smog pump to).  He said=20
> that the longer=20
> the exhaust gasses are in contact with the fresh air being=20
> pumped in, the=20
> more residual combustion (I guess you could say) will occur,=20
> and the lower=20
> the emissions.
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> It sounds like a good idea to me.  But I'd love to hear what=20
> others have to=20
> say about this too.  BTW, I have a programmable chip with=20
> data logging=20
> capability, so I will be able to decrease the timing, and set=20
> all fuel=20
> trims to 14.7:1.  It still worries me some though, that I have forced=20
> induction.  If the dyno operator decides to give it too much=20
> gas, I will=20
> HAVE to add some fuel, or risk blowing the motor up.  And=20
> from what I've=20
> seen, and heard by others, the dyno operators here know=20
> absolutely nothing=20
> about how to properly run an engine on the dyno.  Things like=20
> shifting too=20
> soon, and then having to floor the gas in order to keep the=20
> rpm where it's=20
> supposed to be during the test!
>=20
> Brian
>=20
>=20
> _______________________________________________
> Diy_efi mailing list
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>=20
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