What can I leave off? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Race Prep Miata race-only chat.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 07-12-2013, 12:33 PM   #1
Newb
Thread Starter
 
Join Date: Jul 2013
Location: full time RVer, SD<->CA
Posts: 3
Total Cats: 0
Question What can I leave off?

I have moved to South Dakota where they don't have any smog checks. I am also in the process of changing my '94 to an Italia by Simpson Design, with a supercharger. Things are getting very crowded on the intake side of the engine bay.

I have the stock ECU with a couple of add on, programmable computers for the extra fuel injectors on the blower. So I'm not interested in keeping it street legal in California.

Can I remove the fuel vapor recovery canister and its relay/vacuum controls? How about the EGR valve? Will the stock ECU tolerate those things missing, or not? How about the part of the intake system that has coolant routed through it? If I removed that, would the ECU compensate for cold starts by richening the fuel flow?
ls4wires is offline   Reply With Quote
Old 07-12-2013, 12:43 PM   #2
Junior Member
 
Join Date: Dec 2006
Posts: 192
Total Cats: 8
Default

tpwalsh is offline   Reply With Quote
Old 07-12-2013, 01:04 PM   #3
Newb
Thread Starter
 
Join Date: Jul 2013
Location: full time RVer, SD<->CA
Posts: 3
Total Cats: 0
Question engine ops, not bulk weight

thanks for the link, but those links are about chopping bulk weight only. My front end is already riding 1" higher than stock due to the lighter body. No, I haven't yet changed the springs.

but the real question is what emissions related sensors and actuators can I remove without totally screwing up the engine management?
ls4wires is offline   Reply With Quote
Old 07-12-2013, 01:49 PM   #4
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 9,091
Total Cats: 90
Default

You can remove the canister real easy. Just plug the intake mani and loop the lines. Whats funny is, the lines you loop, one goes into the sub frame and disappears and the other goes to the tank. The EGR and its associated bits will throw a CEL if removed. But you're supercharging so when you replace the stock ecu that wont be an issue.
Leafy is offline   Reply With Quote
Old 07-12-2013, 04:37 PM   #5
Newb
Thread Starter
 
Join Date: Jul 2013
Location: full time RVer, SD<->CA
Posts: 3
Total Cats: 0
Default intake temperature sensor

Okay, thanks for the info on the canister. I'm a retired dude, and am more comfortable with carburetors than ECUs. Is there a different way to set the idle speed that doesn't involve routing vacuum and coolant lines to the IAC unit?

If I don't have a Cat converter either, do I need the EGR? Or does that mean getting a new ECU to avoid that hassle? How about knock sensors?

In short, what do normal race, non-stock engines still have in the emissions area?
ls4wires is offline   Reply With Quote
Old 07-12-2013, 04:46 PM   #6
Junior Member
 
Join Date: Jun 2011
Location: Houston
Posts: 409
Total Cats: 17
Default

Normal race non-stock engines have after market ECU's and remove all emissions equipment.
Handy Man is offline   Reply With Quote
Old 07-12-2013, 04:49 PM   #7
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 9,091
Total Cats: 90
Default

With the 94 engine you dont need coolant going to the throttle body for idle, you still need the air hose going to the idle control valve.

On my racecar, with a stand alone ecu, I have the egr blocked off and removed, no cat, and my evap line is cut at the back of the car at ground level and there's no canister. When I was on the stock ecu I just had the evap canister removed. One thing not mentioned in the canister removal threads is that the bracket it is attached to is bolted on and seam sealered on, just un bolt it and wiggle it till the seam sealer breaks.
Leafy is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Another Alternator thread ihiryu General Miata Chat 9 09-28-2015 11:22 AM
WTB T25/T28 flanged turbo ASAP JesseTheNoob WTB 4 09-11-2015 02:25 PM
Now shipping NC MX-5 (2006-15) Precision Sliding Seat Mounts FAB Fab9 Tuning - Miata Performance Parts 0 09-11-2015 01:02 PM
Advanced Engine Dynamix Review (dead oil pump content) itsMikey Insert BS here 0 09-05-2015 03:56 PM


Tags
egr, fuel canister, intake temperature

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 01:01 AM.