Idle screw whistle after TB Spacer installation
11-10-2010, 07:14 PM
#26
Honda-Tech Member
Re: Idle screw whistle after TB Spacer installation
so what your saying is that you had the car dynoed and then you added JUST the spacer and had it re-dynoed and you gained power?
11-10-2010, 07:26 PM
#27
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Re: Idle screw whistle after TB Spacer installation
11-10-2010, 08:17 PM
#28
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Re: Idle screw whistle after TB Spacer installation
yea b18c5 is correct, you should be thankin him.
TB spacers are pretty much junk, I dun care what brand it is.
AN if it whistles then yes there is a leak, an no TB spacers are not said to be good by the sound they make... lol wow! really you guys c'mon.
The ONLY reason anyone would use a TB spacer is to increase the Plenum volume. A tb spacer can give your engine a small amount of throttle response but thats about it. the spiraling of the air is just a sales pitch an is not doing anything for performance. The only time i would ever spend the money on a TB spaacer is if i had a small Intake manifold on a supercharged car an needed a little bit more plenum space.
all in all... a TB spaces is like having a A/F gauge coming off your stock narrowband o2 sensor.... TRASH!
TB spacers are pretty much junk, I dun care what brand it is.
AN if it whistles then yes there is a leak, an no TB spacers are not said to be good by the sound they make... lol wow! really you guys c'mon.
The ONLY reason anyone would use a TB spacer is to increase the Plenum volume. A tb spacer can give your engine a small amount of throttle response but thats about it. the spiraling of the air is just a sales pitch an is not doing anything for performance. The only time i would ever spend the money on a TB spaacer is if i had a small Intake manifold on a supercharged car an needed a little bit more plenum space.
all in all... a TB spaces is like having a A/F gauge coming off your stock narrowband o2 sensor.... TRASH!
11-11-2010, 04:14 AM
#29
Former Moderator
11-11-2010, 04:20 AM
#30
Former Moderator
Re: Idle screw whistle after TB Spacer installation
I've owned three different B series engines (B18C1, B16A2, and B18C5) in the exact same chassis (1992 Civic Si HB), and each one of them had an audible whistle at certain rpm/loads with an AEM cold air intake installed. Many aftermarket cone type open filter intake systems have loud whistling noises under partial throttle in the mid range rpm.
I never said that a TB spacer would or would not make a whistling sound - to me it's 100% irrelevant since TB spacers are garbage to begin with.
11-11-2010, 08:22 AM
#31
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11-11-2010, 09:22 AM
#32
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Re: Idle screw whistle after TB Spacer installation
11-12-2010, 04:38 AM
#33
Former Moderator
Re: Idle screw whistle after TB Spacer installation
[I just made this up]I installed a throttle body spacer on my 1990 Civic and got an extra 17whp and 24ft-lbs. of torque.[/I just made this up]
See how that works?
Sorry man but around here we would rather see dyno charts rather than hear some anecdotal story from a dyno session that was supposed to have taken place from over 5 years ago. I'm not flat out calling you a liar, but we do see too many "Well my boy had this" or "I got more power from mod X" etc. etc. to know what to believe.
I've got a dyno chart from my own Civic with B18C5 swap from like 2002 when I got the V-AFC tuning done. I saved it because any time I say:
"I picked up +20whp/+20ft-lbs. of torque in the midrange and +8ft-lbs. of peak torque from V-AFC tuning alone!"
If someone calls BS I post the chart. If you're going to reference a dyno visit to bolster an argument, then you'd need to be prepared to back it up with evidence other than your word.
Also:
Do you not even recall how much whp and torque you gained?
And you dynoed the car to get a baseline figure, then installed a TB spacer only, and then redynoed on the same day too, right?
Did you dyno the car as soon as you got to the dyno? How long did you wait before installing the TB spacer, and how long after the spacer install did you redyno the car?
The before/after numbers could have as much to do with heat soak as they would with a TB spacer itself.
Last edited by B18C5-EH2; 11-12-2010 at 04:53 AM.
11-12-2010, 05:50 AM
#34
Honda-Tech Member
Re: Idle screw whistle after TB Spacer installation
I've owned three different B series engines (B18C1, B16A2, and B18C5) in the exact same chassis (1992 Civic Si HB), and each one of them had an audible whistle at certain rpm/loads with an AEM cold air intake installed. Many aftermarket cone type open filter intake systems have loud whistling noises under partial throttle in the mid range rpm.
OP if you know it does nothing, AND it appears to be giving you issues, TAKE IT OFF! Problem solved. But hey, if you want to keep messing with a useless part, go ahead. It's your car after all.
11-12-2010, 07:17 AM
#35
Honda-Tech Member
11-12-2010, 08:10 AM
#36
Honda-Tech Member
Re: Idle screw whistle after TB Spacer installation
Agreed. I hear this all the time on cars with open-filter intakes. My Accord does it a lot, and definitely no vacuum leaks.
Yeah I'm not sure why someone would even bother throwing one of these on "just for s#%ts."
OP if you know it does nothing, AND it appears to be giving you issues, TAKE IT OFF! Problem solved. But hey, if you want to keep messing with a useless part, go ahead. It's your car after all.
Yeah I'm not sure why someone would even bother throwing one of these on "just for s#%ts."
OP if you know it does nothing, AND it appears to be giving you issues, TAKE IT OFF! Problem solved. But hey, if you want to keep messing with a useless part, go ahead. It's your car after all.
11-12-2010, 08:52 AM
#37
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Re: Idle screw whistle after TB Spacer installation
Oh well in that case check this out.
[I just made this up]I installed a throttle body spacer on my 1990 Civic and got an extra 17whp and 24ft-lbs. of torque.[/I just made this up]
See how that works?
Sorry man but around here we would rather see dyno charts rather than hear some anecdotal story from a dyno session that was supposed to have taken place from over 5 years ago. I'm not flat out calling you a liar, but we do see too many "Well my boy had this" or "I got more power from mod X" etc. etc. to know what to believe.
I've got a dyno chart from my own Civic with B18C5 swap from like 2002 when I got the V-AFC tuning done. I saved it because any time I say:
"I picked up +20whp/+20ft-lbs. of torque in the midrange and +8ft-lbs. of peak torque from V-AFC tuning alone!"
If someone calls BS I post the chart. If you're going to reference a dyno visit to bolster an argument, then you'd need to be prepared to back it up with evidence other than your word.
Also:
Do you not even recall how much whp and torque you gained?
And you dynoed the car to get a baseline figure, then installed a TB spacer only, and then redynoed on the same day too, right?
Did you dyno the car as soon as you got to the dyno? How long did you wait before installing the TB spacer, and how long after the spacer install did you redyno the car?
The before/after numbers could have as much to do with heat soak as they would with a TB spacer itself.
[I just made this up]I installed a throttle body spacer on my 1990 Civic and got an extra 17whp and 24ft-lbs. of torque.[/I just made this up]
See how that works?
Sorry man but around here we would rather see dyno charts rather than hear some anecdotal story from a dyno session that was supposed to have taken place from over 5 years ago. I'm not flat out calling you a liar, but we do see too many "Well my boy had this" or "I got more power from mod X" etc. etc. to know what to believe.
I've got a dyno chart from my own Civic with B18C5 swap from like 2002 when I got the V-AFC tuning done. I saved it because any time I say:
"I picked up +20whp/+20ft-lbs. of torque in the midrange and +8ft-lbs. of peak torque from V-AFC tuning alone!"
If someone calls BS I post the chart. If you're going to reference a dyno visit to bolster an argument, then you'd need to be prepared to back it up with evidence other than your word.
Also:
Do you not even recall how much whp and torque you gained?
And you dynoed the car to get a baseline figure, then installed a TB spacer only, and then redynoed on the same day too, right?
Did you dyno the car as soon as you got to the dyno? How long did you wait before installing the TB spacer, and how long after the spacer install did you redyno the car?
The before/after numbers could have as much to do with heat soak as they would with a TB spacer itself.
11-12-2010, 10:06 AM
#38
Former Moderator
Re: Idle screw whistle after TB Spacer installation
no i dynoed the first time when i got my car then months after i install my TB spacer wait couple of weeks (didnt have time) and dynoed again i didnt went that same day but like i said i dont expect to believe it but it does make a diffrence so believe what you guys want
I'm done discussing TB spacers.
11-12-2010, 11:15 AM
#39
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11-12-2010, 05:55 PM
#40
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Re: Idle screw whistle after TB Spacer installation
Funny how a simple already answered topic goes on and on but sooo many ones that need actual help sit with no responses. Kick the horse a bit more. He isn't dead enough 
11-13-2010, 01:58 AM
#41
HT White Ops
Re: Idle screw whistle after TB Spacer installation
I will have to respectfully disagree with this point.
I've owned three different B series engines (B18C1, B16A2, and B18C5) in the exact same chassis (1992 Civic Si HB), and each one of them had an audible whistle at certain rpm/loads with an AEM cold air intake installed. Many aftermarket cone type open filter intake systems have loud whistling noises under partial throttle in the mid range rpm.[...]
I've owned three different B series engines (B18C1, B16A2, and B18C5) in the exact same chassis (1992 Civic Si HB), and each one of them had an audible whistle at certain rpm/loads with an AEM cold air intake installed. Many aftermarket cone type open filter intake systems have loud whistling noises under partial throttle in the mid range rpm.[...]
My B16A2 whistles too...
I'm running an OEM air cleaner/baffle assembly with a K&N panel filter.
11-14-2010, 06:49 PM
#42
Honda-Tech Member
Re: Idle screw whistle after TB Spacer installation
I will have to respectfully disagree with this point.
I've owned three different B series engines (B18C1, B16A2, and B18C5) in the exact same chassis (1992 Civic Si HB), and each one of them had an audible whistle at certain rpm/loads with an AEM cold air intake installed. Many aftermarket cone type open filter intake systems have loud whistling noises under partial throttle in the mid range rpm.
I never said that a TB spacer would or would not make a whistling sound - to me it's 100% irrelevant since TB spacers are garbage to begin with.
I've owned three different B series engines (B18C1, B16A2, and B18C5) in the exact same chassis (1992 Civic Si HB), and each one of them had an audible whistle at certain rpm/loads with an AEM cold air intake installed. Many aftermarket cone type open filter intake systems have loud whistling noises under partial throttle in the mid range rpm.
I never said that a TB spacer would or would not make a whistling sound - to me it's 100% irrelevant since TB spacers are garbage to begin with.
My apologies
11-17-2010, 11:27 PM
#43
HT White Ops
Re: Idle screw whistle after TB Spacer installation
The fix can't be this easy, can it?!?!?
So, apparently, the cure for this is adjusting your idle...
It turns out, the idle screws had to be adjust so far in, that the air rushing in that portion of the throttle control system would make a whistling noise at a specific resonance.
The fix, of course, was to adjust the idle screw... Doing this, obviously, made the engine idle higher... the cure for this, is to adjust the throttle stop screw... this little screw holds the throttle plate open slightly, which allows air directly into the intake at idle, so the IACV doesn't have to work as hard, or open as far, to keep the engine running.
If you do this incorrectly, you might end up w/ a stalling problem when you stop.. this means you've adjusted your throttle stop too far.. and it's causing the butterfly to close completely.. you can't have this in most cases, as the IACV DOES NOT react quickly after 18 years of use. If this is the case, you'd either have to replace the IACV with a new(er) one, or take yours apart and clean it thoroughly, lubricating all moving parts, and potentially rebuilding it to factory specs.. good luck w/ that.
It turns out, the idle screws had to be adjust so far in, that the air rushing in that portion of the throttle control system would make a whistling noise at a specific resonance.
The fix, of course, was to adjust the idle screw... Doing this, obviously, made the engine idle higher... the cure for this, is to adjust the throttle stop screw... this little screw holds the throttle plate open slightly, which allows air directly into the intake at idle, so the IACV doesn't have to work as hard, or open as far, to keep the engine running.
If you do this incorrectly, you might end up w/ a stalling problem when you stop.. this means you've adjusted your throttle stop too far.. and it's causing the butterfly to close completely.. you can't have this in most cases, as the IACV DOES NOT react quickly after 18 years of use. If this is the case, you'd either have to replace the IACV with a new(er) one, or take yours apart and clean it thoroughly, lubricating all moving parts, and potentially rebuilding it to factory specs.. good luck w/ that.
Hi all,
I can't thank you enough for this hint.
I had this annoying whistling noise since I fitted an after market intake. The car is a Honda, however it's not CRX but an Accord. I tried everything, replacing the filter, changing the intake pipe length, taking the whole throttle body to pieces, spraying with WD40 for leaks, but no results.
Then I found the idle screw tip here, well I wouldn't hurt, I thought. And there it is: adjusting a quarter counterclockwise on the idle air screw and the whistling is gone. I took another quarter to this direction to get a healthy strong "roar" instead of "hiss". The idle speed didn't even increased that much so I left the throttle adjusting screw alone.
Thanks again!
I can't thank you enough for this hint.
I had this annoying whistling noise since I fitted an after market intake. The car is a Honda, however it's not CRX but an Accord. I tried everything, replacing the filter, changing the intake pipe length, taking the whole throttle body to pieces, spraying with WD40 for leaks, but no results.
Then I found the idle screw tip here, well I wouldn't hurt, I thought. And there it is: adjusting a quarter counterclockwise on the idle air screw and the whistling is gone. I took another quarter to this direction to get a healthy strong "roar" instead of "hiss". The idle speed didn't even increased that much so I left the throttle adjusting screw alone.
Thanks again!
11-18-2010, 02:40 PM
#44
Honda-Tech Member
Re: Idle screw whistle after TB Spacer installation
^ Interesting find BlackDueceCoupe.
I've never bothered to look for a fix as the noise doesn't annoy me the slightest bit. Would be intriguing to try though just to see if it worked.
I've never bothered to look for a fix as the noise doesn't annoy me the slightest bit. Would be intriguing to try though just to see if it worked.
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