I tried to search on this and I couldnt really find what I was looking for.

1. Is there really such a big change that its worth hesitation on lower RPM's

2. Is there a way to do only part of the mod (elimination of the coolant under the mani)?

3. Do you think leaving the first set of shutters,but modifying them some way would give you more performance with less chance of hesitation? Cut or drill holes in the first set maybe?

Lots of questions, but hope someone can help...thanks!

 

It will only hesitate if you slam open the throttle at low revs. This is a poor driving technique anyway, and any half-skilled driver will quicker learn what not to do to avoid any hesitation. If you want to know what it's like, disconnect the linkage to the upstream secondary throttles and zip-tie them open.

The double-throttle system and the thermowax are two totally separate systems that have no connection with or effect on each other, so yes you can remove just one of them. But why would you want to do that way? The performance improvement comes from removing the double-throttle system, not removing the thermowax. All that gets you is a crappy cold idle. Removing the double-throttle system and leaving thermowax alone makes far more sense.

No.

 

I personally, did not notice any hesitation whatsoever blipping the throttle to the floor with my TB mod.

However, the thermowax is EXTREMLEY important for cold start. I would HIGHLY suggest that you keep it. My ******* car would stall everytime I let my foot off the gas when the engine was cold. Sitting there and reving the engine till warm was ******* retarded, especially in cold assed-canada.
Anyone who then tells you that this "charges" the intake with warm air becuase of the heat is right, but it won't affect performance. If anything, it would heat it up a degree, thats about it. Also, the BAC valve needs the temperature of the coolant to operate properly. So if you take out the thermowax (bad idea) then at least leave the coolant line to the BAC valve. If you don't the valve will stay open slightly, causing an even higher idle, that will never go away becuase of no coolant running through it.

 

That's because you have an NA. The whole issue with the hesitation is only a problem with Turbos, most likely because of the longer intake tract. That's why the upstream secondary throttles are damped and why throttle response improves when they're removed. On NA's they're not damped and there's little or no improvement to be had from removing them.

Of course this has all been discussed before at great length...

 

This is indicative of a problem other than the TB itself.
It's most likely an intake vacuum leak, misadjusted TPS, misadjusted dashpot, or misadjusted throttle plates.
Any of those mentioned will cause it to stall when it's cold.


-Ted

 

RETed, so If I live in California where it doesnt really get too cold, maybe 60's on winter...I shouldnt have a problem with removing the thermal wax?


I appreciate all the feedback guys!

 

According to what he's saying, yes. I think he's right too becuase I did have some leaks there as well wich most likely could have been causing the shitty cold start idle.

I did not know that. back in my 'early' days here a year ago, I must have read up on it quite a few times. However, I never did see anything mentioned that it was a turbo issue. Then again I probably missed it being new and all.

I learn something everyday from you two

 

im just north of sac and i don't use the thermowax, i just raised the idle just above 1k and let it idle for about a minute before i go anywhere when it's cold out, no problems whatsoever.

 

Karack,

You ever come into Roseville? I use to live up in Plumas Lake...just before Marysville. I'm still putting my motor together so my cars not on the road, but it should be within a month or so. I'm trying to get some people together with 7's in or around my area.

 

check the west section, we have monthly meets in sactown somewhere or another so hopefully you can make it when your car is up and running. this month we will be meeting at sevenstock though so the next meet will be in november.

https://www.rx7club.com/west-rx-7-forum-193/norcal-7s-september-meeting-456017/

(one of many examples of our post whoring skill threads, some of my work is posted in other monthly meet threads.)

unfortunately my services aren't free because i am working on getting the shop off the ground and getting cutomers in the door. i do give free advice and technical assistance though for those who do work on cars themselves though.

 

Cool, I should have her on the road and in some what presentable condition I hope by then. If not, I still want to come meet other 7 owners, thanks.

 

Some of us like to have a nice, normal idle. Not a "my cars busted" idle...

 

my idle raises less than 100 RPMs from cold to warm and it runs quite smooth, fix your car if your idle isn't right.

revving to 3k at startup isn't my idea of a normal idle even if it was designed by mazda to be that way. the car is only mazda in appearance now anyways but hardly engineered the same way any longer.

 

I did the throttle body mod and coincidentally got really good at left foot braking.

 

I've been spending the night undoing the tb mod on my NA. Even when it is 90+* out, I still have to sit and let the engine warm up on first start for the day. For me it is not worth the time or hassle and the perfomance increase was nil.

Now if I can just find the rest of the parts I took off.

 

Thanks to my functioning thermowax I have a perfect 900rpm cold idle and a perfect 750rpm warm idle.

You're getting your parts confused. The thermowax has nothing to do with the 3000rpm idle. I don't agree with that function either, but it isn't controlled by anything on the TB.

It has been said many times before that doing this on an NA will have no effect on performance. Don't bother reinstalling the double throttle system, you only need the thermowax for cold idle.

 

I just did this mod a day or 2 after I started this thread and noticed someone who had the car before me did a "half-***" job of attempting this. They left the shutters alone, but blocked off the coolant line to the thermal wax and left it on the throttle body...what a crack head. O-well, at least it is done right now.