looks like i'm getting back into the car scene again with an LT1/T56 in a 85 RX7 (2600lbs ) and i have a choice of computer setups for it. we have emissions testing here-dyno for OBD1 cars, and just a scan for OBD2 so i can't go crazy with anything and i want to stay legal with it.

my mods: lloyd le1 heads, lingenfelter 74211 or 74216 cam (tiny, i know), mid length headers, cat and all emissions equipment.

OBD2- if you have o2 sims, or certain emissions parts programed out, will this be seen by the emissions scanner? i know the scan tool they use is supposed to test each part, but does the lt1edit/tunercat, just "fool" the computer into thinking that the egr valve is working, or will it show it as not being used at all?

i know this is a very mild setup, and i should be able to pass the dyno test, but my old '94 was basically stock with headers, had a new cat, fresh plugs, opti, etc and it still just barely passed every year. and being that this is an engine swap, the inspectors might be a little more picky than they would on other cars.

advise? comments?

 

Hey man, it's going to be real tricky. You should contact your local emmission testers and ask all your questions to them. Just make sure to use a different test place so they won't be suspicous when you get tested. Since it is an '87 emissions shouldn't be too hard to pass, but without real info available, I can't help you there. Maybe someone else should help out, too.

 

Find out exactly what "just a scan" for OBDII means, i.e. how many readiness indicators they need to see, etc. A custom programmed OBDII might be the way to go, and there are people here that can answer your questions about OBDII emissions scans (not me, though).

On the other hand, as Crazy95Z pointed out, the emissions standards for a 1987 car should be relatively easy to pass with a well-tuned LT1 like yours - assuming that they use '87 standards for your re-powered car.

 

i've already looked up the legality of the swap-basically i can put anything in that is newer than the '85 as long as it has all emissions hookups for the newer year, and both years use the same standards for the obd1 test.

high speed test 25 mph using 25% of engines total power (25/25 test)

HC (ppm) 117<
CO (%) .65
CO2 (%) n/a
O2 (%) n/a
NOx (ppm) 821<
dilution (%) >6

low speed test 15 mph using 50% of engines total power (15/50 test)

HC (ppm) 120<
CO (%) .67
CO2 (%) n/a
O2 (%) n/a
NOx (ppm) 907<
dilution (%) >6

with as many ls1 cars running around, i figured obd2 might be the better way to go as long as it didn't trigger an ses light. maybe i'm wrong, though.