Throttle Body Mod
 

Who has done the Throttle Body Mod ans what are your thoughts on it. Would you guys recommend I do it?

I have done it several times. I don't know how to measure results but I can say that it doesn't hurt to do it..:)

i reccomend it. i did it along with ported manifolds and noticed quite a difference in throttle response and i know its not in my head becuase it is that big of a diff

I did it as well. Throttle response is good but it borders on being very touchy. Kinda on or off situation. Either way if you're not stop and go driving which I doubt many of us are then yea do the shit out of it. Took me about 3 hours on mine, no money. Just time.

I like stripping the TB and doing the secondary throttle-plate removal just because it makes everything a lot easier to comprehend... There's probably a little bit of top-end power to be gained, but that's not really why I'd recommend doing it--more for the simplicity. :)

i to like having less stuff in the engine bay. their was a bit of power gain mostly because i had a boost leak from the secondary throttle plate.

kool guys I think I might end up doing it. I am going to wait a while to do it though. So I guess it's mostly all positive and very little negatives if any.

I going to do this mod just to get rid of that one damn coolant line.

DO NOT REMOVE THE THERMO WAX unless you like sitting in the car to warm it up by hold the throttle up. I removed the thermo wax when I first did thsi and quickly regretted it. I put it back in and was very happy with it. I have an NA and at least thought I could notice a difference.

Just put on a new coolant line to the thermo wax. I ditched routing throught the BAC with a longer line.

My car idles fine in the cold, with no emisions and no thermowax andshit. I have to hold the gas for like 20 seconds and then it's fine. And I live in Maine. . it's cold hahaha

Your'e lucky then. In the winter i'd have to hold it for like 5 minutes to get it to idle on it own with out thermo-wax. In the summer I had to hold it for half that time. The engine was good with no vacuum leaks. Not sure Maine gets as cold though....

maine gets cold brother...I like the Deadpool avatar man!!

It's definetly worth the time and effort if you're going for HP. But driveability starts goin down the drain.

when you do this mod do you completely get rid of the BAC?

The "TB mod" has nothing to do with the BAC. They are seperate systems.

The TB mod is also useless on an NA. In my opinion, removing the cold start thermowax is a bad idea just plain stupid since there are no gains to removing it, only disadvantages.

I only have to hold my foot on the gas for a minute or so and I have a HUGE streetport. And I'm very glad that I did the TB mod. The one downside is that the throttle is a bit touchy afterwards. But it's nothing that isn't manageable. Just my .02

I also was happy to remove the thermowax nonsense. :) My car can hold a (low) idle after about 20 seconds of gentle driving. Within two minutes, it's rock-solid at 800 RPM's.

We also removed the thermowax etc. on my buddies 'near-stock' Turbo II and his car can idle just fine, all the time. :dunno:

Then again, the previous owner of my Turbo II had done the thermowax removal on my car before and hated having to give the car a little extra gas--so he reinstalled everything... It's just a matter of taste, I suppose.

whre are the coolant lines that run to the thermowax? mines doesnt have any hooked up.

i have the tb mod done to both my s4 n/a and s4 TII. The n/a had a lot better throttle response afterward, and better overall throttle feel, i would definately recommend it. On the TII though, it makes it really jumpy, you have to ease in and out of the throttle to avoid jerking. this is with a correctly set tps.

and also dont take out the thermowax, my TII had it taken out by a previous owner, and it is a PITA to give it throttle for the first minute or so to get it to idle on its own. espeically when in cold weather.

i noticed no negative effects from taking the bac off, but i do not have AC on either car.

kool guys I am going to do this I am glad for th input thanks!

I know there is a whole thread about how to do it...im just curious if anyone on here would do it for me. Like I could send him my TB and he could send it back when he's done. It doesn't seem that hard to do, just a lot of time, but i dont want to mess anything up. What would you guess suggest. Should i just go for it?

im pretty sure gothamracing.com does it when they port/polish your throttle body. its 200 tho. personally id recommend just givin it a try yourself and saving the 200.

BDC does it as well, I think for $150

I bought a second TB and used that as a guide when I put the other one back together. You can get one off the forum pretty cheap.

Damn straight.....http://smiliesftw.com/x/dogkeke.gif

anyone have any effects WITHOUT A/C and removing the BAC??
i think mine needs adjusted because when its warming up and lite driving it stalls on me...
but id also like to remove it..:)

Hmm... I don't have A/C or the BAC and everything's fine with my setup. Is that what you're asking?

yep!!
when i get around to the TB mod i guess im ditching the BAC!!

well i dont want to start another thread, but i searched and searched and im come to the conclusion that i suck at searching. lol anyways can someone give me direction towards the throttle body mod. i searched throttle body mod, TB Mod, and Butterflies.

Brian

Check out both fc3spro.com and rotaryresurrection.com in the TECH sections. Both have useful write-ups for doing the TB-Mod.

awesome eriksseven thanks alot.

Brian

Thanks everyone...i think it would be easier to have a step by step picture haha. Im more nervous about shaving off too much or a necessary peice. Thanks again

you can do the light tb mod and just take off your plastic intake and unscrew the two butterflys. Then you don't have to worry about a vac leak or screwed up idle.

The NA TB does not have the upsteam secondary throttles damped like the Turbo TB does. Instead they're held fully open once the engine has warmed up. So there is no possible improvement in throttle response unless there was something preventing the plates from fully opening. You shouldn't recommend the TB mod based on your experience because you would've achieved the same result (restored performance) just by fixing whatever was wrong with it.

Again this sounds more like either something is wrong or you need to improve your driving style. You should only get a hesitation if you slam the throttles open at low revs (below ~2500rpm); not exactly a great driving technique. If you're having this problem at higher revs something else is wrong somewhere.

Regarding the removal of the BAC and cold start cam:

Fundamentally I do not understand why people do this. The cold start system helps the car idle and become drivable immediately in cold weather. It in no way costs power and has no effect on the car's operation once the warmup cycle has completed. In our climate (cool in the spring/fall for months and plenty of negative temperatures in the winter) it is a ROYAL PAIN IN THE BUTT to drive most RX-7s that have had this system removed. There is no gain whatsoever to removing this system. Now I know someone is going to say "but it makes my engine bay look cleaner!". To which I will reply "the system is contained entirely on the back of the throttle body and is virtually invisible especially if the car is a TII with a top mount intercooler". Though if you really care how your engine bay looks versus how the car drives, then who am I to convince you otherwise?

The BAC valve is sort of the same thing. For those who do know, the BAC is there to adjust the idle of the engine during various conditions. Whether that be increased load from the A/C (a significant load), increased load from electrical draws, getting off the clutch a little too late when coming from a stop or to assist with the warmup cycle. Removal means that the ECU has no way to control the idle speed of the engine so this must be set manually. Generally this involves raising the idle so the car does not stall easily when the headlights or defrost is turned on, or the engine is loaded for another reason. Of course I can already hear the replies "But Aaron, removing the BAC makes my engine bay look pretty!". And of course I respond with something like this "The only car that really puts the BAC out there for all to see is the S4 NA. The TIIs and S5 NAs have it tucked towards the passenger side of the car down much lower in an area that is already heavily cluttered with hoses and wiring". Did I mention that driving a car in a cool climate with the BAC and cold start removed means that you are in for a world of hurt? Of course, if you really care how your car looks more then how it functions, then who am I to convince you otherwise?

And what about selling the car? Good luck explaining to the new owner why the car has to be idled manually and warmed up for several minutes before it is driven...