Do C5's have a choke mode ?
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Le Mans Master
Joined: Feb 2004
Posts: 8,629
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From: York PA
Do C5's have a choke mode ?
I bought a 160 stat at the local speed shop & the guy told me if the engine don't get up to temp the car will always be in a (choke mode) and won't run as good. Is that correct ?
Team Owner
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From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Originally Posted by cenzo
I hope you just paid for the part and not the advice. That guy doesn't know what he's talking about.
Sounds like a parts seller, not a parts man. It sounds almost like some downhome name for "open loop". 
Burning Brakes
Joined: Oct 1999
Posts: 920
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From: Rogers, AR, USA
This isn't going to be along with most C5 owners thinking, but, basically he's right. A carbureated engine has a choke to enrich the fuel air mixture until it's up to temp. A fuel injected engine has a computer and sensors to enrich the air fuel mixture until it's up to temp. The effect is the same, a cooler engine is run richer than a hotter engine. Does it actually develope more measureable power?
If you watch NASCAR races, you may notice they don't become concerned about any effect on the highly tuned racing engines until they are running over 240 degrees. If there was any signifacant power gain running at a lower temp. you can bet all your bucks that they would run at 160 to 180 degrees. They wouldn't even consider running an engine hard at 160 degrees. Wonder why? I'll follow more of what the real professionals do.
Always consider the knowledge of the people giving you the advice.
If you watch NASCAR races, you may notice they don't become concerned about any effect on the highly tuned racing engines until they are running over 240 degrees. If there was any signifacant power gain running at a lower temp. you can bet all your bucks that they would run at 160 to 180 degrees. They wouldn't even consider running an engine hard at 160 degrees. Wonder why? I'll follow more of what the real professionals do.
Always consider the knowledge of the people giving you the advice.
Drifting
Joined: Jul 2004
Posts: 1,571
Likes: 1
From: Hollywood Md
Originally Posted by alanh
This isn't going to be along with most C5 owners thinking, but, basically he's right. A carbureated engine has a choke to enrich the fuel air mixture until it's up to temp. A fuel injected engine has a computer and sensors to enrich the air fuel mixture until it's up to temp. The effect is the same, a cooler engine is run richer than a hotter engine. Does it actually develope more measureable power?
If you watch NASCAR races, you may notice they don't become concerned about any effect on the highly tuned racing engines until they are running over 240 degrees. If there was any signifacant power gain running at a lower temp. you can bet all your bucks that they would run at 160 to 180 degrees. They wouldn't even consider running an engine hard at 160 degrees. Wonder why? I'll follow more of what the real professionals do.
Always consider the knowledge of the people giving you the advice.
If you watch NASCAR races, you may notice they don't become concerned about any effect on the highly tuned racing engines until they are running over 240 degrees. If there was any signifacant power gain running at a lower temp. you can bet all your bucks that they would run at 160 to 180 degrees. They wouldn't even consider running an engine hard at 160 degrees. Wonder why? I'll follow more of what the real professionals do.
Always consider the knowledge of the people giving you the advice.
The thermostat (160) doesn't limit the engine's operating temp to 160 degrees. Nor does it have any link to one's right foot, or one's brain.
Some good info in your 1st paragraph though.
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From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
Originally Posted by 4DRUSH
I bought a 160 stat at the local speed shop & the guy told me if the engine don't get up to temp the car will always be in a (choke mode) and won't run as good. Is that correct ?
Jay, your car already has a 160 stat that was installed with your Paxton kit!! You probibly run around 180-190 with that stat installed unless it's very cold out while highway driving.
The cold start air fuel is all controlled by the pcm and is tuned accordingly to the thermostat that was installed at that time so dont worry about that.
As far as Nascar cars running much hotter, yes they do, why?? because the average N/A car makes more torque when hot. Of course the average F/I car does not. Along with the fact that Nascar cars run on RACE GAS. Your car does not, so running it that hot would increase the likely hood of detonation which would most likely have you calling for a forged bottom end.
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Joined: May 2001
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From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Originally Posted by alanh
This isn't going to be along with most C5 owners thinking, but, basically he's right. A carbureated engine has a choke to enrich the fuel air mixture until it's up to temp. A fuel injected engine has a computer and sensors to enrich the air fuel mixture until it's up to temp. The effect is the same, a cooler engine is run richer than a hotter engine. Does it actually develope more measureable power?
If you watch NASCAR races, you may notice they don't become concerned about any effect on the highly tuned racing engines until they are running over 240 degrees. If there was any signifacant power gain running at a lower temp. you can bet all your bucks that they would run at 160 to 180 degrees. They wouldn't even consider running an engine hard at 160 degrees. Wonder why? I'll follow more of what the real professionals do.
Always consider the knowledge of the people giving you the advice.
If you watch NASCAR races, you may notice they don't become concerned about any effect on the highly tuned racing engines until they are running over 240 degrees. If there was any signifacant power gain running at a lower temp. you can bet all your bucks that they would run at 160 to 180 degrees. They wouldn't even consider running an engine hard at 160 degrees. Wonder why? I'll follow more of what the real professionals do.
Always consider the knowledge of the people giving you the advice.
on a carburetor requires an air reduction to accomplish the fuel enrichment. That is where the name "choke" probably originated in the first place. Our C5's are not "choking" anything. Like DOUG @ ECS said, the PCM controls this function. Mainly by altering the fuel trims. One of the biggest reasons I can think of right off hand for not running an engine too cold is OIL. It cannot adequately do it's job if it's too cold, plus it provides up 25% of the engine cooling as well.
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Team Owner
Joined: May 2001
Posts: 36,836
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From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Originally Posted by 2000BSME
hmmmmm....lot's of experts in here....
Thread Starter
Le Mans Master
Joined: Feb 2004
Posts: 8,629
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From: York PA
Originally Posted by DOUG @ ECS
Jay, your car already has a 160 stat that was installed with your Paxton kit!! You probibly run around 180-190 with that stat installed unless it's very cold out while highway driving.
The cold start air fuel is all controlled by the pcm and is tuned accordingly to the thermostat that was installed at that time so dont worry about that.
As far as Nascar cars running much hotter, yes they do, why?? because the average N/A car makes more torque when hot. Of course the average F/I car does not. Along with the fact that Nascar cars run on RACE GAS. Your car does not, so running it that hot would increase the likely hood of detonation which would most likely have you calling for a forged bottom end.
The cold start air fuel is all controlled by the pcm and is tuned accordingly to the thermostat that was installed at that time so dont worry about that.
As far as Nascar cars running much hotter, yes they do, why?? because the average N/A car makes more torque when hot. Of course the average F/I car does not. Along with the fact that Nascar cars run on RACE GAS. Your car does not, so running it that hot would increase the likely hood of detonation which would most likely have you calling for a forged bottom end.
The new stat is for my 99 FRC that I just bought. Don't worry I'am not going to mess with my ECS built car !
Last edited by 4DRUSH; Jun 17, 2006 at 12:36 AM.
