Divergent Lightning
woah
Does any one have an exhaust cutout? What kind of effectiveness does it show on a syty? I have seen some turboed vehicles gain as much as 30 HP from a cutout. What do you guys think?
Exhaust Cutouts
- Thread starter Divergent Lightning
- Start date
I just installed my electric cutout that I got from www.dmhperformance.com. I still have too much knock to really tell a HP difference. It is really loud compaired to my 3inch exhaust, but when my engine starts spuddering, it sounds pretty nasty. Once my Alky kit comes in, I will take my Ty to the track and try it opened and closed to see what the difference is. I guess I'll post the times, as long as they are decient ones, if not, I'll just post the difference it times.
G
Guest
Guest
With my truck, the turbo spools quicker and actually reaches more boost with the cutout open. I like it.
phoonTy
Truckless. For now.
make sure you have better boost control than the stock wastegate if you are doing a cutout.
ben has one on his truck, and had it dyno'd. i'm thinking ~238hp and something like 370 ft-lbs closed and 270+hp and 437 ft-lbs open. so it's a serious gain, especially in torque. only problem is he overboosts very very easily. and if i remember correctly, it was an AWD dyno. i'm sure he'll chime in if he sees the topic.
ben has one on his truck, and had it dyno'd. i'm thinking ~238hp and something like 370 ft-lbs closed and 270+hp and 437 ft-lbs open. so it's a serious gain, especially in torque. only problem is he overboosts very very easily. and if i remember correctly, it was an AWD dyno. i'm sure he'll chime in if he sees the topic.
DanenGraham
Big in the rear
13.6 @ 97mph no cat
13.8 @ 93mph w/cat
that is what a cutout would about do, i had dual exhaust with no cat and two muffs, then went to cat and muff. Spool up time was almost gone on a stock truck. But overboosting problems were allways there every time i gunned it.
13.8 @ 93mph w/cat
that is what a cutout would about do, i had dual exhaust with no cat and two muffs, then went to cat and muff. Spool up time was almost gone on a stock truck. But overboosting problems were allways there every time i gunned it.
Divergent Lightning
woah
phoonTy said:
I have an innovative minigate ready to be installed in the near future. So the better boost control will be taken care of.
Lynn D. Brown
New member
Clint,
Do U feel lucky - Well, do U, punk ? Sorry, wrong Clint.
The PTE DP SyTy kit comes with a cutout, so I'll see how mine works. I have a cutout on my GN with the stock exhaust behind it. Racing at the Buick Nationals w my ~ 500 HP Conley engine, I knocked a FULL 1 second off my time when I uncorked it.
Do U feel lucky - Well, do U, punk ? Sorry, wrong Clint.
The PTE DP SyTy kit comes with a cutout, so I'll see how mine works. I have a cutout on my GN with the stock exhaust behind it. Racing at the Buick Nationals w my ~ 500 HP Conley engine, I knocked a FULL 1 second off my time when I uncorked it.
Divergent Lightning
woah
Lynn D. Brown said:
That is some impressive reduction in time there. I was hoping to get an electric cutout. It will make it easier on my nerves and knees not haveing to reach under my car every time I wanted to "uncork" it. Is there space to put it inbetween the DP and the cat?
Anybody tried to use one of the electric cutouts to build a active exhaust system? I've built and installed these on injected harleys and so far the dyno results have been excellent. On the h-d's we are using the ecm, o2 and rpm to drive the motors (2 into 2 exhaust) But on the syty's I am thinking of using a pressure switch (boost) to be the primary signal, to vary the butterfly position poportional to boost. My cutout should be delivered tommorrow and I have the basic control design and parts in hand. I have a superbowl trip this weekend so I won't be able to tackle the installation until next week after I return. Of course I'll leave a full manual function intact as well as a disable (closed) position. It'll take a bit of testing to determine the proper speed/rate at which the butterfly should be driven, but I should be able to use the data from the wbo2 and wego. I'll probably wait until I install the new motor until I do all that or if I get bored I'll do it with the present configiration for reference.
phoonTy
Truckless. For now.
that's a pretty good idea. but will most electric dumps open that fast? will has one, and his is relatively slow to open. so you would have to factor that in, time to open the dump, to make it work properly. i have not seen one in my investigations that opens rapidly.
sytyguy
Moderated User
BG and I spoke of this a long time ago, and I found that almost every offered electric cutout opened too slow for integrated use (via TPS, boost, etc...). Basically, you hit the gas.......3-5 seconds later the cutout fully opens, but by that time you've already hit full boost and chewed up one third of a 1/4 mile run. Just not effective......and it's not that bad to just reach over and open it at the staging lights. It's make a lot of bystanders wonder, "WTF just happened to that truck?"
It's a nice idea (and was back then), but the cutouts just aren't up to speed (literally).
Hood
It's a nice idea (and was back then), but the cutouts just aren't up to speed (literally).
Hood
phoonTy
Truckless. For now.
maybe instead of going fully electronic, use electronics ie. tps, boost, whatever to meerly trip a quick release mechanism. then, after the run, you would need to close the dump manually. say, with something like the ultimate, have one setting that "activates" the dump circuit. make your run, dump is triggered, viola! run ends, close dump, drive home.
although, i'm not technically minded enough to know if that is actually possible. it just sounded like a cool idea.
although, i'm not technically minded enough to know if that is actually possible. it just sounded like a cool idea.
I checked on that and was told it was 3 seconds stop to stop. For all out racing (high rpm launch) your going to want it full open anyway, but for other applications when you factor in spool-up time, I think that speed is about right to provide a porportionate setting (boost to blade angle) We've tried both electric motors (rotary) and linear (solenoids) on the h-d's and settled on the solenoids since they don't have the spool-up delay. however my t-charged bike uses a rotary style even though the spool-up is diminished by variable vanes and short intake tract.
sytyguy
Moderated User
On a properly matched setup, spoolup is not really an issue. In fact, it hasn't really been a problem for many years now. If you could rig some quick release setup (like TJay mentioned), then that would be the way to go........until someone offers a quicker motor. Ya gotta remember just how slow 3 seconds is for an automated setup. Launch to 60 in a fast truck......there's 3 seconds. Most guys will be in 2nd gear and nearly 150' out on the track by the time the dump opens. That's not bad, but still too slow for most of us.
The nice thing about opening the cutout ahead of time, is that there are no "changes" during the run........because my tune changes substantially depending on whether the dump is open or closed. My ET also changes, dropping by nearly .4 in the 1/8th. In fact, on my setup, it changes a lot.....boost control, fueling, etc.... And if all this changed 1/4 way down the track, who knows where the tune might be. I have a rather restrictive muffler, and I'm sure my boost control could be better, but I know others suffer the same way.
But, hey.....if you can make it work, then all the better. I'd be interested in this setup given it works properly. I don't want my words to discourage you, as I'm all for trying new stuff and making things work. Just want you to see all the angles before putting any time/money into this idea.
Let us know what you find out,
Michael
The nice thing about opening the cutout ahead of time, is that there are no "changes" during the run........because my tune changes substantially depending on whether the dump is open or closed. My ET also changes, dropping by nearly .4 in the 1/8th. In fact, on my setup, it changes a lot.....boost control, fueling, etc.... And if all this changed 1/4 way down the track, who knows where the tune might be. I have a rather restrictive muffler, and I'm sure my boost control could be better, but I know others suffer the same way.
But, hey.....if you can make it work, then all the better. I'd be interested in this setup given it works properly. I don't want my words to discourage you, as I'm all for trying new stuff and making things work. Just want you to see all the angles before putting any time/money into this idea.
Let us know what you find out,
Michael
sytyguy
Moderated User
phoonTy said:
While not electronic, a local guy runs a sleeper wagon with a pair of manual dumps (car is super quiet @ idle, but right out of the hole, it livens ups). While I haven't dissected his setup, best I can tell, he has 2 cable operated cutouts (old school style - see Mr. Gasket, etc....) that, instead of being operated manually in the cab via pull knob, are tied to the carb linkage and open upon full throttle. This may be a somewhat archaic setup and not exactly the most revolutionary design for us, but it could work.
There are other ways to make this work, there just aren't enough hours in the day for me to sit down and think about them.
Hood
Divergent Lightning
woah
Hood,
I was planning on having the cutout open before I launch. So if it does take 3 seconds to open, I can do that right before I stage and by the time I launch it will already be wide open.
Though I am not sure if I am forgetting something with which this would cause problems. With the cutout open wouldn't that let the turbo hit full boost faster because the exhaust gasses can leave faster?
I was planning on having the cutout open before I launch. So if it does take 3 seconds to open, I can do that right before I stage and by the time I launch it will already be wide open.
Though I am not sure if I am forgetting something with which this would cause problems. With the cutout open wouldn't that let the turbo hit full boost faster because the exhaust gasses can leave faster?
sytyguy
Moderated User
Yes....opening the dump will allow spoolup to be quicker.....just make sure that your WG can handle the lack of exhaust restriction.
If you plan on opening it before a run, you're all set. Just manual open cutout after getting to staging lights and close after run. If you wanted to go automatic with it, you could tie in a with a low pressure hobbs switch (something around 1-2 psi) and as you start to build, the dump would open. This could work very nicely, because we all know that we have to sit at the staging lights for more than 3 seconds. :roll: Otherwise, you could just trigger it via TPS or a microswitch.
The on-the-fly instant opening is what is tough to do. If you're giving yourself time for the dump to open, then your golden......easy stuff.
Hood
If you plan on opening it before a run, you're all set. Just manual open cutout after getting to staging lights and close after run. If you wanted to go automatic with it, you could tie in a with a low pressure hobbs switch (something around 1-2 psi) and as you start to build, the dump would open. This could work very nicely, because we all know that we have to sit at the staging lights for more than 3 seconds. :roll: Otherwise, you could just trigger it via TPS or a microswitch.
The on-the-fly instant opening is what is tough to do. If you're giving yourself time for the dump to open, then your golden......easy stuff.
Hood