Tunning for an electronic cutout, i want to run 1 on the dumptube, 1 on the exhaust
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Tunning for an electronic cutout, i want to run 1 on the dumptube, 1 on the exhaust
I want to run an electronic cutout on the dumptube (wastegate), and also one on the exhaust. The reason i wanna do this is so if i want the ride to be "quiet" i can have both cutouts closed, if i want it to be louder/loud at boost, i can have dumptube cutout open, and exhaust cutout open for full out.
My question is how should i tune for this? Most the time i wont be running either cutout, but if i do run the exhaust one doesnt that lean out the fuel mixture? so should i tune with both closed, both open, 1 open 1 closed?
Thanks
My question is how should i tune for this? Most the time i wont be running either cutout, but if i do run the exhaust one doesnt that lean out the fuel mixture? so should i tune with both closed, both open, 1 open 1 closed?
Thanks
#2
Re: Tunning for an electronic cutout, i want to run 1 on the dumptube, 1 on the exhaust (aleks77)
The purpose of the wastegate is to blead off excess exhaust gasses from the turbine wheel. If you block off the wastegate dump then you'll see mucho boost!
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Re: Tunning for an electronic cutout, i want to run 1 on the dumptube, 1 on the exhaust (sohc_turd)
DONT PUT A CUT OUT ON THE DUMP TUBE!!!!
if you dont want the wastegate to be too loud then just have your welding shop route it to dump into the downpipe. That way when you have you cutout open you will hear it and when it is closed you wont.
if you dont want the wastegate to be too loud then just have your welding shop route it to dump into the downpipe. That way when you have you cutout open you will hear it and when it is closed you wont.
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lol im not an idiot, what i meant was, i will have a Y pipe in the dumptube, ofcorse it will be welded to the downpipe, basically like this:
WG
|
|
|\
| \ <--- cutout
|
\
_\________ <-- exhaust
WG
|
|
|\
| \ <--- cutout
|
\
_\________ <-- exhaust
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Re: (aleks77)
if i am not mistaken, open dump tube should have minimal if not any effect on the tune itself... also I would put the exhaust cutoff on a full throttle switch and tune just like that... I like automation, i'm weird like that. Im working on something similar, but it is 1 switch to actuate a cutoff, arm my meth kit, arm my intercooler spray bar, and switch the 2 stage boost controller to hi. If you are at all interested ill let you know how it turns out...
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#8
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Re: (aleks77)
just tune open downpipe. u will run a tad bit richer w. the cutout closed. i've been doing that in my turbo car. a/f w/ open dump were around 11.3, with it closed like 10.6:1
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so is the a/f of 10.6 a big problem? is that gonna cause damage to the motor running it rich? I know lean = bad but is too rich bad too? cause it is gonna be closed downpipe most the time
#11
Honda-Tech Member
Re: (aleks77)
10:1 A/F in boost is not gonna hurt the motor. u might foul out the plugs faster, but its not gonna hurt (wash out the rings). u need way more fuel than 10:1 to wash out rings
#12
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Re: (boosted k20)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted k20 »</TD></TR><TR><TD CLASS="quote">just tune open downpipe. u will run a tad bit richer w. the cutout closed. i've been doing that in my turbo car. a/f w/ open dump were around 11.3, with it closed like 10.6:1</TD></TR></TABLE>
If you're going to limit yourself to one tune, I'd suggest the opposite - tuning with the exhaust on the car. You'll have potentially significantly higher backpressure with the exhaust on the car than with the e-cutout open. This is going to significantly change how much timing you can safely run, particularly on the top end of the motor. I'd rather blow a bunch of energy out the exhaust valves than end up on the wrong side of the knock limit due to excessive backpressure.
And in regards to AFR differences... this is one time where you really have to be smarter than your wideband.
If you're going to limit yourself to one tune, I'd suggest the opposite - tuning with the exhaust on the car. You'll have potentially significantly higher backpressure with the exhaust on the car than with the e-cutout open. This is going to significantly change how much timing you can safely run, particularly on the top end of the motor. I'd rather blow a bunch of energy out the exhaust valves than end up on the wrong side of the knock limit due to excessive backpressure.
And in regards to AFR differences... this is one time where you really have to be smarter than your wideband.
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hmm, maybe ill just put the e-cutout at the end of the exhaust system, right before the muffler, would that be ok? that shouldnt need 2 tunes right? and wouldnt change the a/f that much?
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Re: (blundar)
I don't understand why you need to put an e-cutout on the wastegate dump. If you route the wastegate to the exhaust... Seams like a waste to me. KISS
#17
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Re: (blundar)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blundar »</TD></TR><TR><TD CLASS="quote">
If you're going to limit yourself to one tune, I'd suggest the opposite - tuning with the exhaust on the car. You'll have potentially significantly higher backpressure with the exhaust on the car than with the e-cutout open. This is going to significantly change how much timing you can safely run, particularly on the top end of the motor. I'd rather blow a bunch of energy out the exhaust valves than end up on the wrong side of the knock limit due to excessive backpressure.
And in regards to AFR differences... this is one time where you really have to be smarter than your wideband. </TD></TR></TABLE>
so ur sayiung tune with the exhaust closed????? so when u open it up, ur a/f will then will be in the mid 12's...even 13's??? two tunes will be better, but i havent had any problems knocking with a tune on open exhaust compared to closed exhaust. besides if u have an e-cutout, most of the time u will open it up if u r gonna beat on the car.... well thats what i do.
If you're going to limit yourself to one tune, I'd suggest the opposite - tuning with the exhaust on the car. You'll have potentially significantly higher backpressure with the exhaust on the car than with the e-cutout open. This is going to significantly change how much timing you can safely run, particularly on the top end of the motor. I'd rather blow a bunch of energy out the exhaust valves than end up on the wrong side of the knock limit due to excessive backpressure.
And in regards to AFR differences... this is one time where you really have to be smarter than your wideband. </TD></TR></TABLE>
so ur sayiung tune with the exhaust closed????? so when u open it up, ur a/f will then will be in the mid 12's...even 13's??? two tunes will be better, but i havent had any problems knocking with a tune on open exhaust compared to closed exhaust. besides if u have an e-cutout, most of the time u will open it up if u r gonna beat on the car.... well thats what i do.
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Gonna bump this back up since i didnt get a solid answer, one person did it this way, one person did it another way, i just thought i would get a simple answer i guess didnt realize this wasnt settled.
I really dont want to run 2 tunes, cause i wanna be able to just hit the switch and open the exhaust up anytime i want. What i am gonna be doing is running the ecutout closed like 99% of the time, so i thought i because i am gonna be running the motor like this all the time, i might as well tune it this way? But im afraid that even for the 5-10 minutes im gonna run open downpipe a week, i will damage my engine.
I really dont want to run 2 tunes, cause i wanna be able to just hit the switch and open the exhaust up anytime i want. What i am gonna be doing is running the ecutout closed like 99% of the time, so i thought i because i am gonna be running the motor like this all the time, i might as well tune it this way? But im afraid that even for the 5-10 minutes im gonna run open downpipe a week, i will damage my engine.
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