IAT Question ??
Thread Starter
Race Director
Joined: May 2005
Posts: 15,960
Likes: 21
From: West Norriton PA
St. Jude Donor '08
IAT Question ??
My 2001 Corvette Coupe w/auto had a magnuson SC installed on it.
They removed the IAT sensor completely. Can anyone tell me why they did this ?
I have since removed the maggie and re-installed an LS6 manifold with stock injectiors. I plan to run a halltech stinger, would you re-install the IAT ?
They removed the IAT sensor completely. Can anyone tell me why they did this ?
I have since removed the maggie and re-installed an LS6 manifold with stock injectiors. I plan to run a halltech stinger, would you re-install the IAT ?
Advanced
Joined: May 2007
Posts: 67
Likes: 0
From: Farmington MI
My 2001 Corvette Coupe w/auto had a magnuson SC installed on it.
They removed the IAT sensor completely. Can anyone tell me why they did this ?
I have since removed the maggie and re-installed an LS6 manifold with stock injectiors. I plan to run a halltech stinger, would you re-install the IAT ?
They removed the IAT sensor completely. Can anyone tell me why they did this ?
I have since removed the maggie and re-installed an LS6 manifold with stock injectiors. I plan to run a halltech stinger, would you re-install the IAT ?
If you're going back to a manifold setup, you'll want to have the tune re-adjusted too. Otherwise, it'll be quite rich...
Racer
Joined: Mar 2005
Posts: 454
Likes: 1
From: Portland Oregon
There are tables in the tune to add or pull timing based on the IAT. The reason it gets remove is that the IAT is changed when you compress the air. The tune would pull timing because of the high IAT. My IAT table is blank because my car was pulling timing when the car go hot and heated up the sensor giving it a bogus reading. My climate is pretty steady here and no need to pull timing based on the temperature.
Take care,
-Ken
Take care,
-Ken
Thread Starter
Race Director
Joined: May 2005
Posts: 15,960
Likes: 21
From: West Norriton PA
St. Jude Donor '08
There are tables in the tune to add or pull timing based on the IAT. The reason it gets remove is that the IAT is changed when you compress the air. The tune would pull timing because of the high IAT. My IAT table is blank because my car was pulling timing when the car go hot and heated up the sensor giving it a bogus reading. My climate is pretty steady here and no need to pull timing based on the temperature.
Take care,
-Ken
Take care,
-Ken
Thanks for info. I always here turbo and SC guys talking about IAT tempertures. That was why I was wondering why tuner removed mine. Makes sense now.
Thanks,
Tony
Intermediate
Joined: Aug 2006
Posts: 35
Likes: 0
From: Henderson NV
Sorry to highjack this but I have done many searches for a 2001 IAT- but where is the thing located? Its not in my my stock airbridge or surrounding area. Do I have to pull that ugly contraption they call a stock airbox out? Thanks!
Thread Starter
Race Director
Joined: May 2005
Posts: 15,960
Likes: 21
From: West Norriton PA
St. Jude Donor '08
If it's not there then more than likely it was removed by someone.
Intermediate
Joined: Aug 2006
Posts: 35
Likes: 0
From: Henderson NV
I just found a thread that says for 2001 its integrated into the MAF. That would explain why when I shot it with cleaner 2 months ago the pinging went away for a few days- I am trying to stop the pinging in this Nevada heat without having to get a tuner right now
Thread Starter
Race Director
Joined: May 2005
Posts: 15,960
Likes: 21
From: West Norriton PA
St. Jude Donor '08
That's funny, because my other 2001 coupe had a it in the airbridge. It was early 2001 that was made in July of 2000.
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Le Mans Master
Joined: Aug 2005
Posts: 5,375
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From: CA.
St. Jude Donor '13-'14-'15
The IAT as mentioned adds or removes timing based on Intake air temperatures--It has nothing to do with fuel mixture --rich or lean--many tuners (including myself) delete the entire table--As under normal operating conditions it subtracts up to 7 degrees timing unneccesarily-the IAT sensor is a good idea however it usually reads underhood temps or airbridge temps which are not actual AIR intake temps--What happens is that the undehood temps transfers to the IAT mistakenly and you get a false reading--Another reason for getting rid of the table is to elimonate any timing surprises when doing performance tuning--When you dial is 28* timing --you will get 28* timing--there will be no subtractions--makes for more accurate tuning-
Another table that is similar that many tuners delete is the coolant temp table--same principal applys here--No surprises or subtractions--The coolant sensor however is accurate--but GM takes out way to much timing in respect to higher coolant temps--as low as 200* it starts to subtract timing--
Another table that is similar that many tuners delete is the coolant temp table--same principal applys here--No surprises or subtractions--The coolant sensor however is accurate--but GM takes out way to much timing in respect to higher coolant temps--as low as 200* it starts to subtract timing--
Burning Brakes
Joined: Aug 2003
Posts: 1,070
Likes: 9
From: MARRIOTTSVILLE MD
The IAT as mentioned adds or removes timing based on Intake air temperatures--It has nothing to do with fuel mixture --rich or lean--many tuners (including myself) delete the entire table--As under normal operating conditions it subtracts up to 7 degrees timing unneccesarily-the IAT sensor is a good idea however it usually reads underhood temps or airbridge temps which are not actual AIR intake temps--What happens is that the undehood temps transfers to the IAT mistakenly and you get a false reading--Another reason for getting rid of the table is to elimonate any timing surprises when doing performance tuning--When you dial is 28* timing --you will get 28* timing--there will be no subtractions-
I think a better approach is to relocate the IAT sensor in combination with editing the IAT table so that the IAT sensor does the job its intended to do giving you the proper timing for variations in the weather. Yea GM is a bit conservative with the IAT table but thats no excuse for zeroing it out. Take the extra time and edit it for the intended application.
INTHERED
Racer
Joined: Mar 2005
Posts: 454
Likes: 1
From: Portland Oregon
If GM was so smart about it they would have put it in a proper place and had it be and IAT sensor instead of a partial under hood partial IAT sensor. This table was also not designed for forced induction applications where there will be large temp variations while under and not under boost. I have seen plenty of tunes by competent tuners with this table zeroed out, because the table is not intended for use in some of these applications. If you are having that much knock occur with only 10^ air temp difference maybe you should have one of those competent tuners take a look at yours. Zeroing out the table has virtually no effect on drivability or reliability if the tune is solid and there are not HUGE temperature differences. AFR is much more important and is well taken care of by the rest of the tune.
-Ken
-Ken
Team Owner
Joined: May 2004
Posts: 26,345
Likes: 232
From: SoCal
The IAT as mentioned adds or removes timing based on Intake air temperatures--It has nothing to do with fuel mixture --rich or lean--many tuners (including myself) delete the entire table--As under normal operating conditions it subtracts up to 7 degrees timing unneccesarily-the IAT sensor is a good idea however it usually reads underhood temps or airbridge temps which are not actual AIR intake temps--What happens is that the undehood temps transfers to the IAT mistakenly and you get a false reading--Another reason for getting rid of the table is to elimonate any timing surprises when doing performance tuning--When you dial is 28* timing --you will get 28* timing--there will be no subtractions--makes for more accurate tuning-
Another table that is similar that many tuners delete is the coolant temp table--same principal applys here--No surprises or subtractions--The coolant sensor however is accurate--but GM takes out way to much timing in respect to higher coolant temps--as low as 200* it starts to subtract timing--
Another table that is similar that many tuners delete is the coolant temp table--same principal applys here--No surprises or subtractions--The coolant sensor however is accurate--but GM takes out way to much timing in respect to higher coolant temps--as low as 200* it starts to subtract timing--
May not be right but it works for me........
DH
Burning Brakes
Joined: Aug 2003
Posts: 1,070
Likes: 9
From: MARRIOTTSVILLE MD
If GM was so smart about it they would have put it in a proper place and had it be and IAT sensor instead of a partial under hood partial IAT sensor. This table was also not designed for forced induction applications where there will be large temp variations while under and not under boost. I have seen plenty of tunes by competent tuners with this table zeroed out, because the table is not intended for use in some of these applications. If you are having that much knock occur with only 10^ air temp difference maybe you should have one of those competent tuners take a look at yours. Zeroing out the table has virtually no effect on drivability or reliability if the tune is solid and there are not HUGE temperature differences. AFR is much more important and is well taken care of by the rest of the tune.-Ken
INTHERED
Guest
Posts: n/a
My 2001 Corvette Coupe w/auto had a magnuson SC installed on it.
They removed the IAT sensor completely. Can anyone tell me why they did this ?
I have since removed the maggie and re-installed an LS6 manifold with stock injectiors. I plan to run a halltech stinger, would you re-install the IAT ?
They removed the IAT sensor completely. Can anyone tell me why they did this ?
I have since removed the maggie and re-installed an LS6 manifold with stock injectiors. I plan to run a halltech stinger, would you re-install the IAT ?
