emission issues

[turbo2nr]

well im getting ever so close to turbo time. i did the search but no real luck on emission issue.

i have a 97 s14 (obdII) and i know when going turbo im going to throw codes. such as egr and o2.

for egr i was planing to weld another bung in the downpipe and re- route the egr back into there. what are the downsides to this?i was hearing that i could put a resistor in the egr plug or some think like that.

as for the o2 ill keep the 2nd o2 and i have a bung for the first o2 but since i have a 0bd2 ill throw a code because im missing the pre-cat. so to avoid this do i have to add a cat between the downpipe and mid pipe?i dont want to do this.

the reason for this is b/c i live in nyc and we has tuff emmission laws kinda no way to get around it..thanks

[PapaSmurf2k3]

well if your just worried about codes, couldnt you just get a tuned ECU? I thought they eliminated those codes from their programming

[turbo2nr]

i dont know of any one that will tune a obd2 most companies do obd1.

[PapaSmurf2k3]

F it then, take the bulb out, or find out what the resistance is supposed to be, and wire in the resistor.

[TheOne]

F it then, take the bulb out, or find out what the resistance is supposed to be, and wire in the resistor.

probably can't take the bulb out as they still check the ecu(through a code scanner)

either find a buddy that wants some cash, or you are going to have to put a cat, probably could do well from putting a hollow/hi-flow cat, but needs to have a very good tune.(maybe 2 tunes, 1 for emissions and 1 for your high spirited driving)

[Bosrudorfer]

probably can't take the bulb out as they still check the ecu(through a code scanner)

either find a buddy that wants some cash, or you are going to have to put a cat, probably could do well from putting a hollow/hi-flow cat, but needs to have a very good tune.(maybe 2 tunes, 1 for emissions and 1 for your high spirited driving)

The 95-96 S14 I believe have OBD-II but are more like OBD-I (Have less codes or something or are easier to tune). Anyhow JimWolf can tune that sucker for $500 or so and I was told I myself would pass (buy one online or from a junkyard). I'm going to run SAFC-II until I have to get emissions next year and by then hope to upgrade to a JimWolf tuned ECU.

We here have both OBD-II scan and sniff test

[nelson8708]

my friend swapped a s14 motor into his s13 but he kept this obd-1 ecu and harness. All he had to change was the dizzy. You would just leave all the extra sensors on you motor unpluged. Just hook up every thing on engine harness. You could get your hands on a ka24de obd-1 harness, ecu, and dizzy and swap them out then you would have a obd-1 car and no more worries about the second o2 sensor.

Just my 2 cents

[turbo2nr]

whats a dizzy?

[dontbugme]

If you build it right, emisions won't be a problem, at least for a street car. A good "tune" is all about efficiancy as regards to Hp. Cars done right don't need the advice; "Yo, man tape over the CEL"! or, "Find some guy to bribe". Hp and efficiency go hand in hand as can be seen by this member's (markemark, see below) results. There are others, suggest you search under emissions. Ripping OEM stuff off cars just because people think they have a negative impact on performance w/o doing any reasearch is nuts and usually creates more problems.

[quote Markemark]"UPDATE: Car passed sniffer-emissions in Connecticut! Second time my KA-T has passed in CT...

Not bad considering i'm running fuel injectors that flow twice as much as stock, have a completely different ford Cobra MAFS, JWT ECU, and an engine that is very far from stock....

Here's some of the technical info:

CT emissions test done by Agbar Technologies using the ASM 25/25 procedure.All fuel used in tests from Longmeadow Sunoco - 93 octane.Limits: HC: 125, CO: 0.67, Nox: 1458fInitial test 2004 when MA was using MTBE gas (370 cc injectors, JWT ECU):HC 83, CO 0.43, Nox 1927 - Fail

Retest after lowering Fuel pressure from 34 to 29 psi, adding 10% methanolto fuel, retard timing 10 degrees: fHC 47, CO 0.32, Nox 1454 - Pass

Initial test 2006 (MSD 50 lb/hur fuel injectors, Ford COBRA MAFS, JWT ECU), MA not using MTBE gas anymore, now have a 10% ethanol mix, fuel pressure @25 psi, timing retarded ~5 degrees:

HC 37, CO 0.36, Nox 1695 - Fail - OAT 72 degrees, no fan supplied for thedyno test, but they're required to at 72 degress and above-this caused the engine to run very hot, increasing NOx.

Retest after setting fuel pressure to 31 psi, timing retarded 10 degrees, 10% methanol, hot wiring electric fan (to make sure it's always running), OAT 58 degrees:

HC 66, CO 0.50, Nox 1453 - Pass

Again, the car just passed by the skin of its teeth for NOx (5 parts per million from the limit).

Still, for how modified/fast this car is, passing sniffer emissions in CT is pretty impressive...

[turbo2nr]

i agree im am not one for tearing off stock parts and hiding the remains. they were put there for a reason.

i dont want to do a ghetto zip tie/duck tape setup. i want my car to be functional and fast.

i want to keep my egr and possably one cat. i deffinatly want to get rid of the pre cat. but i hear with 97 that i will throw codes. i cant have that.

my setup for fuel for now would be 370cc safc and a pump. i only plan to make 7-9 psi untill i can afford better fmu.

is there any way i can get around throwing codes w/o a tuned ecu?

thanks for all the useful info everyone.

[C-Kwik]

Keep the emissions in tact and you should have no problems with throwing codes. Though you may need to swap to a new cat as most turbo arrangements don't work well with the OE cat in place. Weld bungs in for the 02 sensors. Mine had them and I kept them plugged in and it never threw a code for that. Route the EGR tube back in after the turbo and you should be fine. Mine had been bypassed and threw codes. But when I had switched to an E-manage for tuning, the altered MAF signal apparently put it out of range for either EGR operation or it thought it was still working okay as it never threw a EGR code again.

[Luderacer14]

You could do what i did, have JWT tune your ecu and solder in resistors for your egr temp and rear o2. All you do is leave them unplugged and you won't have to worry about those codes,

[turbo2nr]

do i have to have jwt ecu for hte resistors to work?

[Nissan_240sx]

whats a dizzy?

Distributor..

[racin-type]

Sup Andrew, its me Lo, Tat's friend

You don't need a tuned ecu, o2 simulator and some type of resistor for the egr then both wont throw codes

or

put in ONE cat anywhere before the second O2, put a second o2 bung on your downpipe and route the egr pipe back into your downpipe before cat and again no codes

or

go to another state which has no emissions like me hehe

or

get someone to pass you which i haven't heard much about for obdII