Smog Pump
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Two to three horsepower. Maybe as much a 5 HP over 6000 rpm. Will you feel it? That depends on how much trouble the project gives you and how much you end up spending. The harder the job and the more costly, the greater the S.O.T.P. rewards. Beyond "feel", there will be no measurable performance gain.
RACE ON!!!
RACE ON!!!
Racer
Joined: Oct 2003
Posts: 304
Likes: 0
From: Marlboro NY
Since when will a car give you a great S.O.T.P. feel and not be measured on a drag strip. I have done minor mods you couldn't feel and they translated to hundreds to tenths off my times. The biggest SOTP was locking the torque converter right off launch which netted me .3 and 4 mph. That was awesome but the repeated abuse cracked the output shaft of the transmission. SO try it once get your timeslip and retire it before it breaks.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by Gold1986Vette420
I have done minor mods you couldn't feel and they translated to hundreds to tenths off my times.
RACE ON!!!
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by plumberh2o
In MidAmerica they claim 20 extra horse power? So that is a lot of bull.
Originally Posted by plumberh2o
The cost to remove this is 170.00. Is it worth it or not?
KenCan
KenCan
RACE ON!!!
Racer
Joined: Oct 2003
Posts: 304
Likes: 0
From: Marlboro NY
Hundreds or even as much as a tenth or more. Couldn't feel it either way.
The ONLY ONES I did feel were:
Switching from 3.07 to 3.73 netted about an average of .3 tenths and 2.5 mph.
Locking the Converter was about .29 off my best and 3.5+ mph.
one that didn't feel like much of anything:
All I got was a Quick bump in the back From a shift kit. .07 seconds and about .8 mph, definately not seat of the pants.
Nothing at all:
MSD 6A ???????? no improvement I noticed
Fluidamper ???? seemed to go .01-.02 slower could have been weather.
big thumbs up to BFG 315/35/17 drag radials, consistent, consistent, consistent.
one day out I went 12.651 (170 water temp), 12.673 (180 water temp), 12.659 (165 water temp), 12.674 (170 water temp), and 12.653(160 water temp) The track warmed about 15 degrees over the day. with all the trees in the .05's or better with one .003. Where was corvette day then??????????????????
The ONLY ONES I did feel were:
Switching from 3.07 to 3.73 netted about an average of .3 tenths and 2.5 mph.
Locking the Converter was about .29 off my best and 3.5+ mph.
one that didn't feel like much of anything:
All I got was a Quick bump in the back From a shift kit. .07 seconds and about .8 mph, definately not seat of the pants.
Nothing at all:
MSD 6A ???????? no improvement I noticed
Fluidamper ???? seemed to go .01-.02 slower could have been weather.
big thumbs up to BFG 315/35/17 drag radials, consistent, consistent, consistent.
one day out I went 12.651 (170 water temp), 12.673 (180 water temp), 12.659 (165 water temp), 12.674 (170 water temp), and 12.653(160 water temp) The track warmed about 15 degrees over the day. with all the trees in the .05's or better with one .003. Where was corvette day then??????????????????
Last edited by Gold1986Vette420; Apr 14, 2006 at 01:11 AM.
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Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by Gold1986Vette420
The ONLY ONES I did feel were:
Switching from 3.07 to 3.73 netted about an average of .3 tenths and 2.5 mph.
Locking the Converter was about .29 off my best and 3.5+ mph.
Switching from 3.07 to 3.73 netted about an average of .3 tenths and 2.5 mph.
Locking the Converter was about .29 off my best and 3.5+ mph.
But again, you help me prove my point in that what you feel (S.O.T.P.) isn't always verified on the time slip. In your cases, you felt nothing but got a little. It goes the other way, too. Usually the S.O.T.P. improvement is directly proportional to the expense or effort involved in the modification.
RACE ON!!!
Racer
Joined: Sep 2005
Posts: 297
Likes: 0
From: Wauseon Ohio
i just purchased that air pump replacement pulley from mid america. I must say it looks nice and is a nice solid peice of metal not worth $170. But i busted my alt to air pump bracket and this replaced that, and i eliminated ALL of my emmissions crap.
Drifting
Joined: Sep 2004
Posts: 1,638
Likes: 3
Originally Posted by Biff Buyer
i just purchased that air pump replacement pulley from mid america. I must say it looks nice and is a nice solid peice of metal not worth $170. But i busted my alt to air pump bracket and this replaced that, and i eliminated ALL of my emmissions crap.
Carl Johansson
Drifting
Joined: Nov 2002
Posts: 1,905
Likes: 1
From: 2003 Points Champ Great Lakes Corvette Challenge; 2006/2007 Winner MSD True Street
FWIT...
I installed a Breathless Performance delete on my "88 -Polished.
Really cleaned up the engine bay.
However (as I posted last Fall) I was experiencing some huge crankcase pressure at high RPM under Nitrous/drag race conditions.
Anyway, I installed (had it done) a crankcase evac system that uses a belt driven airpump using the OEM bracket for the original airpump which caused me to remove the nice Elim Bracket/pulley from Breathless and retro the old one.
So now I have a polished elim kit that I don't use. Interested?
Matt383
I installed a Breathless Performance delete on my "88 -Polished.
Really cleaned up the engine bay.
However (as I posted last Fall) I was experiencing some huge crankcase pressure at high RPM under Nitrous/drag race conditions.
Anyway, I installed (had it done) a crankcase evac system that uses a belt driven airpump using the OEM bracket for the original airpump which caused me to remove the nice Elim Bracket/pulley from Breathless and retro the old one.
So now I have a polished elim kit that I don't use. Interested?
Matt383
Drifting
Joined: Sep 2004
Posts: 1,638
Likes: 3
Matt,
after eliminating mine - I seem to have increased oil pressures - what used tgo be 42 lbs at idle and 60 at 2200 rpm now is 60 lbs at idle and 72 - 75 lbs at 2200 rpm. any correlation?
Carl Johansson
after eliminating mine - I seem to have increased oil pressures - what used tgo be 42 lbs at idle and 60 at 2200 rpm now is 60 lbs at idle and 72 - 75 lbs at 2200 rpm. any correlation?
Carl Johansson
Originally Posted by Matt383
FWIT...
I installed a Breathless Performance delete on my "88 -Polished.
Really cleaned up the engine bay.
However (as I posted last Fall) I was experiencing some huge crankcase pressure at high RPM under Nitrous/drag race conditions.
Anyway, I installed (had it done) a crankcase evac system that uses a belt driven airpump using the OEM bracket for the original airpump which caused me to remove the nice Elim Bracket/pulley from Breathless and retro the old one.
So now I have a polished elim kit that I don't use. Interested?
Matt383
I installed a Breathless Performance delete on my "88 -Polished.
Really cleaned up the engine bay.
However (as I posted last Fall) I was experiencing some huge crankcase pressure at high RPM under Nitrous/drag race conditions.
Anyway, I installed (had it done) a crankcase evac system that uses a belt driven airpump using the OEM bracket for the original airpump which caused me to remove the nice Elim Bracket/pulley from Breathless and retro the old one.
So now I have a polished elim kit that I don't use. Interested?
Matt383
Drifting
Joined: Nov 2002
Posts: 1,905
Likes: 1
From: 2003 Points Champ Great Lakes Corvette Challenge; 2006/2007 Winner MSD True Street
Originally Posted by Carl Johansson
Matt,
after eliminating mine - I seem to have increased oil pressures - what used tgo be 42 lbs at idle and 60 at 2200 rpm now is 60 lbs at idle and 72 - 75 lbs at 2200 rpm. any correlation?
Carl Johansson
after eliminating mine - I seem to have increased oil pressures - what used tgo be 42 lbs at idle and 60 at 2200 rpm now is 60 lbs at idle and 72 - 75 lbs at 2200 rpm. any correlation?
Carl Johansson
Wow! That's a lot of PSI at 2200 RPM.
My motor is a bit different than yours I am guessing, so the variables are endless to draw a direct comparrison/conclusion based soley on the air pump. (see my sig)
But you may have something there.
My pressure went real high at 6000+ rpm, more on the juice.
My compression is 12:1 and I am close to 390 C.I.D. FWIT.
Now with the crankcase evac I watch my PSI actually drop as I go over 3500 rpm as it is belt driven.
Matt383
Instructor
Joined: Jan 2006
Posts: 230
Likes: 0
From: Ol Dirty Durham NC
Originally Posted by Matt383
FWIT...
I installed a Breathless Performance delete on my "88 -Polished.
Really cleaned up the engine bay.
However (as I posted last Fall) I was experiencing some huge crankcase pressure at high RPM under Nitrous/drag race conditions.
Anyway, I installed (had it done) a crankcase evac system that uses a belt driven airpump using the OEM bracket for the original airpump which caused me to remove the nice Elim Bracket/pulley from Breathless and retro the old one.
So now I have a polished elim kit that I don't use. Interested?
Matt383
I installed a Breathless Performance delete on my "88 -Polished.
Really cleaned up the engine bay.
However (as I posted last Fall) I was experiencing some huge crankcase pressure at high RPM under Nitrous/drag race conditions.
Anyway, I installed (had it done) a crankcase evac system that uses a belt driven airpump using the OEM bracket for the original airpump which caused me to remove the nice Elim Bracket/pulley from Breathless and retro the old one.
So now I have a polished elim kit that I don't use. Interested?
Matt383
Drifting
Joined: Nov 2002
Posts: 1,905
Likes: 1
From: 2003 Points Champ Great Lakes Corvette Challenge; 2006/2007 Winner MSD True Street
Originally Posted by C4CBF
Matt are you saying by deleting the AIR pump it increased your oil pressure?
I deleted it on the last engine build, so I do not have "before and After" data.
In other words, I had it on the old motor and deleted it on the new motor. The new motor never had the air pump.
Sorry.
Matt383
Instructor
Joined: Jan 2006
Posts: 230
Likes: 0
From: Ol Dirty Durham NC
Originally Posted by Matt383
I wish I could tell you.
I deleted it on the last engine build, so I do not have "before and After" data.
In other words, I had it on the old motor and deleted it on the new motor. The new motor never had the air pump.
Sorry.
Matt383
I deleted it on the last engine build, so I do not have "before and After" data.
In other words, I had it on the old motor and deleted it on the new motor. The new motor never had the air pump.
Sorry.
Matt383
Safety Car
Joined: Dec 2004
Posts: 4,088
Likes: 0
From: Poop land
I removed the AIR diverter module from mine and it cleaned up the passenger's side engine bay pretty well. I just wrapped up the solonoid connectors with black duct tape and set them aside tucked somewhere near the A/C compressor or valve cover. Looks pretty neat now.
That smog pump now just blows air in my engine compartment and its not really that much air to be useful as a supercharger.
That smog pump now just blows air in my engine compartment and its not really that much air to be useful as a supercharger.
Racer
Joined: Oct 2003
Posts: 304
Likes: 0
From: Marlboro NY
Originally Posted by CFI-EFI
The one that surprises me is the .07 from locking the converter. I'll have to try that.
But again, you help me prove my point in that what you feel (S.O.T.P.) isn't always verified on the time slip. In your cases, you felt nothing but got a little. It goes the other way, too. Usually the S.O.T.P. improvement is directly proportional to the expense or effort involved in the modification.
RACE ON!!!
But again, you help me prove my point in that what you feel (S.O.T.P.) isn't always verified on the time slip. In your cases, you felt nothing but got a little. It goes the other way, too. Usually the S.O.T.P. improvement is directly proportional to the expense or effort involved in the modification.
RACE ON!!!