I imagine most people do it this way. That rod represents only a slight impedance in flow. I was in the process of porting the manifolds anyway, so a little JB and a few extra minutes with the dremel was no big deal.cmoody2006 wrote:
I have been wondering this same thing..... Couldn't you just remove the 4 flaps and call it done? I have my intake torn apart right now at my comp desk with me and I'm going to see how it reacts with the flaps removed but leaving the rod in place... So there's no jb welding to do and there's minimal restriction
Secondary Butterfly Removal
-
Cone Junky
- Posts: 622
- Joined: Sun Jan 20, 2008 8:06 am
- Car: S13 fastback
BMW e46 328i - Location: San Diego
Re: (cmoody2006)
-
gingerbredman
- Posts: 543
- Joined: Sat Jun 09, 2007 11:36 am
- Car: 93 SE hatch, ~260k miles on the clock, 15" Enkei 92s, still stock. 2009 Sonata bouncing on Eibachs.
Re: Secondary Butterfly Removal
I'm bumping this. It's been nearly a decade since I've last logged on here, but I'd like to add my experience with removing the secondary butterflies for anyone who stumbles across the thread as I did.
Now, my old ka used to be quick back in the day. As in easily barking 3rd on hard acceleration, compared to now where low-end feels like flooring an old Camry at 1500rpm in 5th gear! I can manage to bark 2nd, but only with the engine really pumping. Currently, the engine is stock, stock exhaust, stock intake, ignition system, base timing, cooling system, etc, without the butterflies. When I was fooling with cams years back, I inadvertently forgot or somehow disconnected the swirly actuator, they got stuck closed. This resulted in very nice low-end torque, with power abruptly choking before I could stop smiling haha. I ended up removing the system altogether and, regrettably, the loss of everything below the 3.5-3.7k rpm range is miserable to say the least. Passing at 40mph, in 4th gear? Forget about it. Damn near have to downshift at 75mph in 5th to pass. Compression is decent, in the passing range btw. I will say that when power finally starts building, it's pretty sweet.
I'm bumping this because I've been slowly restoring knicks and nacs on the car and this subject was on the list. Kind of recovering the car from my days as a newb doing stupid stuff with it :l . I've searched a bit and found only a handful of folks who can attest that removing the secondaries is detrimental to performance on a stock/stockish ka. I'm talking people who "normal daily" their 240's like me and I'm sure some others here and there. As far as the removal actually 'removing' that much torque down low, I can definitely believe it. It's not necessarily horrible, it just changes the technique of daily driving. Cruising is fine, normal acceleration is fine, but action of any sort requires a downshift. I kind of regret it, I've got mixed feelings about it honestly. In a way, the powerband feels like that of turbo engine, only not..boosted.
Now, my old ka used to be quick back in the day. As in easily barking 3rd on hard acceleration, compared to now where low-end feels like flooring an old Camry at 1500rpm in 5th gear! I can manage to bark 2nd, but only with the engine really pumping. Currently, the engine is stock, stock exhaust, stock intake, ignition system, base timing, cooling system, etc, without the butterflies. When I was fooling with cams years back, I inadvertently forgot or somehow disconnected the swirly actuator, they got stuck closed. This resulted in very nice low-end torque, with power abruptly choking before I could stop smiling haha. I ended up removing the system altogether and, regrettably, the loss of everything below the 3.5-3.7k rpm range is miserable to say the least. Passing at 40mph, in 4th gear? Forget about it. Damn near have to downshift at 75mph in 5th to pass. Compression is decent, in the passing range btw. I will say that when power finally starts building, it's pretty sweet.
I'm bumping this because I've been slowly restoring knicks and nacs on the car and this subject was on the list. Kind of recovering the car from my days as a newb doing stupid stuff with it :l . I've searched a bit and found only a handful of folks who can attest that removing the secondaries is detrimental to performance on a stock/stockish ka. I'm talking people who "normal daily" their 240's like me and I'm sure some others here and there. As far as the removal actually 'removing' that much torque down low, I can definitely believe it. It's not necessarily horrible, it just changes the technique of daily driving. Cruising is fine, normal acceleration is fine, but action of any sort requires a downshift. I kind of regret it, I've got mixed feelings about it honestly. In a way, the powerband feels like that of turbo engine, only not..boosted.