View Poll Results: Should I bother with the IAC on a Holley 670 TB?
Spend the dough to have the IAC boss drilled and tapped
0
0%
Forget the IAC...it is a PITA
1
100.00%
Forget the Holley TB...it is another PITA
0
0%
Other...
0
0%
Multiple Choice Poll. Voters: 1. You may not vote on this poll
IAC again
Thread Starter
Senior Member
Joined: Nov 2003
Posts: 647
Likes: 0
From: Rockport, TX
Car: 1980 Jeep CJ7
Engine: AMC 360 with GM TBI
Transmission: TF727 set for kill...let's get it on!!!
IAC again
Okay...last time I promise...
I am working on a tune with an OEM TB right now that may see some good progress now that I have what seems to be the last vacuum leak tracked down. Once that tune is finished, I am planning to put the 670 cfm Holley TB on my AMC 360. It is the TB that came with a ProJection system. I am planning to bolt the OEM injector pod to the top of it. The BIG question is...will I really NEED the IAC or not? Right now, with my OEM TB, I am seeing IAC steps as low as 0 and averaging at about 7...I think. I need to verify that one. Anyway, if my IAC counts are that low, is the IAC necessary?
I am working on a tune with an OEM TB right now that may see some good progress now that I have what seems to be the last vacuum leak tracked down. Once that tune is finished, I am planning to put the 670 cfm Holley TB on my AMC 360. It is the TB that came with a ProJection system. I am planning to bolt the OEM injector pod to the top of it. The BIG question is...will I really NEED the IAC or not? Right now, with my OEM TB, I am seeing IAC steps as low as 0 and averaging at about 7...I think. I need to verify that one. Anyway, if my IAC counts are that low, is the IAC necessary?
Supreme Member
Joined: Jun 2000
Posts: 7,554
Likes: 1
From: In reality
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
Tuning involves being able to tune. So that means keeping all your options open until you find out what works for YOUR car/truck/jeep/lawnmower.
What I do is try to mock up and test as many mods as I can. At any one time lots of engines are a million times prettier then mine, but mine is reconfigurable. I can swap out 3 different sized TBs, Uppipes, in less then 10 mins.. Upper plenums, 20 or so. Being able to mix and match some parts is a key element.
So, what you might do is find an IAC and *remote* housing and then just use a few hoses and clamps to tie it all together to see what the difference is in having it or not. The 87-88 3.8L FWD drive cars have a little IAC housing that'd take 45 mins to graft a few hoses to and install.
Like I really liked the large butterfly, but it left little to no real throttle response over 3/4 throttle. So for the few HP it cost me, I found the car being more fun to drive by being able to modulate almost WOT a lil.
What I do is try to mock up and test as many mods as I can. At any one time lots of engines are a million times prettier then mine, but mine is reconfigurable. I can swap out 3 different sized TBs, Uppipes, in less then 10 mins.. Upper plenums, 20 or so. Being able to mix and match some parts is a key element.
So, what you might do is find an IAC and *remote* housing and then just use a few hoses and clamps to tie it all together to see what the difference is in having it or not. The 87-88 3.8L FWD drive cars have a little IAC housing that'd take 45 mins to graft a few hoses to and install.
Like I really liked the large butterfly, but it left little to no real throttle response over 3/4 throttle. So for the few HP it cost me, I found the car being more fun to drive by being able to modulate almost WOT a lil.
Thread Starter
Senior Member
Joined: Nov 2003
Posts: 647
Likes: 0
From: Rockport, TX
Car: 1980 Jeep CJ7
Engine: AMC 360 with GM TBI
Transmission: TF727 set for kill...let's get it on!!!
So, the larger butterfly will allow better low end throttle response, but the upper end may suffer a little? In Jeepland, low-end stuff is what we all look for. The more low-end grunt I can get the better. You may have just sealed up the decision to put the Holley TB in the Jeep just to give it a try. I can regear for better mid and upper if I need to...hell, I could even adapt a 4L60E to my 360 if I wanted to spend the $$ to do it. That may just be a future option. If the holley TB doesn't work worth a crap, I can take it off and go from where I left off.
I have an adapter on my Eddy intake that will accept any TB from an OEM up to the 2" Holley TB. If I could find a way to make that IAC housing work with it, all would be set and I could easily follow your ways, Master Jedi. Finding what works would simply be a matter of following the Force.
Thanks, Grumpy!
Grumpy, now you have me putting yet ANOTHER little part on my junkyard wishlist...that IAC housing.
I have an adapter on my Eddy intake that will accept any TB from an OEM up to the 2" Holley TB. If I could find a way to make that IAC housing work with it, all would be set and I could easily follow your ways, Master Jedi. Finding what works would simply be a matter of following the Force.
Thanks, Grumpy!
Grumpy, now you have me putting yet ANOTHER little part on my junkyard wishlist...that IAC housing.
Senior Member
Joined: Oct 1999
Posts: 6,621
Likes: 2
Car: 91 Red Sled
Axle/Gears: 10bolt Richmond 3.73 Torsen
I vote for tuning without the IAC in warm weather. You'll probably have to run cold starts with 1 foot dedicated to the throttle but when you're moving it's nice to be able to lift and have the car slow down 
. That IAC is nice when it's got a tight collar, limit the TF and speed up the close speed = happy.
It'll be interesting to see the WOT high gear high rpm pressure drop through the stock TB vs the 2"er.
. That IAC is nice when it's got a tight collar, limit the TF and speed up the close speed = happy.It'll be interesting to see the WOT high gear high rpm pressure drop through the stock TB vs the 2"er.
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