AZOG

Planning to remove emissions. If I keep my BAC will i still need to remove the double throttle body plates and remove thermowax ?

I will be following this procedure.

https://www.rotaryresurrection.com/2...s_removal.html

If I keep the BAC what parts should I NOT remove.

I appreciate that someone took the time to take pictures and make a guide for this but really wish they would explain the reasoning behind some of the steps.

From what I understand removing the BAC will most likely make my idle **** so what are most of you guys doing when removing emissions.

professionalpyroman

Hey bud,

what car do you have/engine are you running? If you have a stock engine, best not to remove any of it.

AZOG

87 13B NA . runinng full racingbeat exhaust with no cats.

scathcart

Why are you removing emissions? No judgement, just curious. There is no performance benefit. Its really only for cosmetics.

No matter what, keep the BAC. The secondary throttle plates can go if you can keep off full throttle when the engine is cold so as to not balloon the oil cooler or pop an oil cooler line.

Keep the air bleeds and diffusers; especially the primaries. They really help with idle, like the BAC

AZOG

I understand there’s no performance benefit . Was going to install FPD eliminator and while I’m at it I figured I tidy up the engine bay. I also have no Cats and don’t have to pass emissions so the emissions are just dead ugly weight . Thank you for your response .

Can you elaborate on what u mean by air bleeders and diffusers ? Not sure I know what you’re talking about .

edit: just did some research and I’m assuming your talking about the diffuser for the injectors which also act as the seat for them too . Noted , thank you sir I will def keep them and replace if the seats don’t look good.

Sideways7

iTrader: (7)

Air bleeds / diffusers are plastic inserts that go under the injectors. You can't see them when everything is together, so there shouldn't be a reason so touch them anyway.

Definitely keep the BAC, and keeping the thermowax is definitely recommended. The thermowax keeps it running when cold, and the BAC maintains idle. I've had one or both disabled on various iterations of my car, and I can tell you that it is a huge PITA for no benefit other than it looking slightly cleaner. Having to keep your foot slightly on the gas whenever you are stopped starts out annoying and just gets worse as time goes on.

As mentioned, you can remove the double throttle plates as long as you don't romp on it when cold.

AZOG

Awesome thanks for the info. I’ll take your word for it and keep both the thermowax and BAC . But what would be the main purpose of removing the double throttle plates ? Better throttle response ?

professionalpyroman

Some on here would argue that it would give you better response, but any engine can only take in so much of a transient air pulse at a time. You lose one of your engine protections for an unnoticeable gain. Pretty pointless unless you're going to build a racecar out of it, or live in some place really hot.

AZOG

Ok true that . Thanks man . I’m gonna remove subzero, egr, and acv and keep Bac and thermowax and the plates and put it back together and see how she’s running.

Sideways7

iTrader: (7)

I think you can see some gains from removing the double throttle plates on a turbo car, especially if the TB is ported. However, I just don't see the NA engines moving enough air for it to make any difference.

All of that used to be really popular back in the dark ages when I got mine (~15 years ago), and I know I did all of the "TB mods". I was young and stupid and didn't care too much (it had character....), but when a did a turbo swap and ran it with a complete TB it was so much nicer. Thankfully this seems to be less popular these days, at least from what I've seen.