Colder Weather and Alky Injection

[Razor]

Just the opposite. Normally the rear cylinders go leaner without the power plate. So theoretically you'd be better off without the plate in cold weather. : ) But I don't think you'll have to worry about temps getting too cold with a dutt neck stock IC that's listed in your sig. You'd need a large IC that can get the temps down. And if you are running the turbo in your sig at high boost the temps out the turbo are going to be pretty high. You could probably run in -20 weather before you'd reach the inlet temps that the large turbo/FMIC combos are seeing and it's debatable if it's even an issue with those combos.

And just to be clear, what people are theorizing about the cold weather effect with alky would only affect those people who are doing wideband correcting of their fuel. So the theory is...is real, it would richen up the rear cylinders only, give a false rich reading, the chip/ecu pulls fuel, the front cylinders go lean when the fuel is pulled, boom. Now there is no measured data saying how much the wideband A/F reading would change with the effect as it is pure guesswork. So if you are not correcting and run the same amount of boost in the colder weather it shouldn't affect you. Now if you run more boost because of the cold weather you will need to add more fuel typically. So if you are not correcting for this you'll get in trouble anyway, which seems to be the most common fault in cold weather.

Weather gets colder.. air is denser.. car makes more boost and needs more fuel. You leave things alone and kaboom. Thats why more fuel is needed and a lower target afr typically takes up any slack from colder weather racing.

 

[kidglok]

I would say based on weight and mph that pressure sounds correct. Or enough to not have an issue. Unless there is something else going on. Thats why I was looking at the plugs and the oil. And for Irons thats not crazy boost either. I think you sent me a log of the run. I'll look for it latter.

that was the run when i leaned number 1, this is from last week

i'll email you the log and gct

 

[TR Custom Parts]

For those running a 160 t-stat would it help throwing in a 180 for the colder weather?

 

[we4Mateo]

For those running a 160 t-stat would it help throwing in a 180 for the colder weather?

I've often thought along those lines too but it wouldn't really effect intake temps and I believe that's where the problem lies.

 

[BadAssGN]

Weather gets colder.. air is denser.. car makes more boost and needs more fuel. You leave things alone and kaboom. Thats why more fuel is needed and a lower target afr typically takes up any slack from colder weather racing.

The point we are trying to drive home is when alky does not vaporize it shows up on a wideband as richer than usual. This is more prominent with a dual nozzle.
The problem gets worse when your a/f correction says hey it's rich and pulls fuel. Boom # 1 or # 2 head gasket blown ( if your lucky)

I just saw this the other night again. Ambient air temp 30f dual nozzle kit. Fast pulled fuel because the wideband saw 9.7

I love alky but people have to know when it's cold this will happen.

 

[kidglok]

I don't understand this theory


If the rear is rich, the front is lean?

Then the lean front cylinders should cancel out the rear being rich and the mixture should reflect the same ratio at the sensor. Now if we are talking about less octane in the front two, that might be more accurat

 

[BadAssGN]

I don't understand this theory

If the rear is rich, the front is lean?

Then the lean front cylinders should cancel out the rear being rich and the mixture should reflect the same ratio at the sensor. Now if we are talking about less octane in the front two, that might be more accurat

I guess you'd call this a theory but I believe the rear cylinders are getting drenched with liquid alky and unburnt fuel is passing into the exhaust
The other factor is our plenums are designed to flow air not liquid which is why a power plate won't distribute it.

The plugs from the last car I saw this on reflected this. The rear plugs were fouled and the front 2 were white.

if you think spraying too much alky won't hurt you would be wrong.

 

[kidglok]

I guess you'd call this a theory but I believe the rear cylinders are getting drenched with liquid alky and unburnt fuel is passing into the exhaust
The other factor is our plenums are designed to flow air not liquid which is why a power plate won't distribute it.

The plugs from the last car I saw this on reflected this. The rear plugs were fouled and the front 2 were white.

if you think spraying too much alky won't hurt you would be wrong.

I understand what your saying,

But unburnt fuel passing thru the exhaust wouldn't make the sensor read rich, remember the sensor reads oxygen content not fuel content. It could be a combination of both I suppose

 

[Mr.Spool]

running 9.3 afr,15 degrees of timing,27psi of boost on a 64 billet 68,iron heads, and a powerplate with pump gas alky m10/m15 at 150psi,pulled the plugs they looked all the same but i run a tt 5.6 chip.

 

[jpwalt1987]

running 9.3 afr,15 degrees of timing,27psi of boost on a 64 billet 68,iron heads, and a powerplate with pump gas alky m10/m15 at 150psi,pulled the plugs they looked all the same but i run a tt 5.6 chip.

That seems like a strange tune. Super rich and no timing. What kind of ET did it run? Gasoline? E-85?

 

[Rafs-T-Type]

Just the opposite. Normally the rear cylinders go leaner without the power plate. So theoretically you'd be better off without the plate in cold weather. : )

Just flip the plate around in the winter then

 

[Mr.Spool]

hess 93 and meth.6.70's 1/8 on less boost 23/24psi and letting out as i dont have a cage.last time the car went down the track i had replace the 10 bolt rear, no times yet on the 9inch and more boost.

 

[BadAssGN]

running 9.3 afr,15 degrees of timing,27psi of boost on a 64 billet 68,iron heads, and a powerplate with pump gas alky m10/m15 at 150psi,pulled the plugs they looked all the same but i run a tt 5.6 chip.

What was the ambient temp? and what intercooler?

 

[Mr.Spool]

air temp 58,old school kb big boy front mount.

 

[Mr.Spool]

in warmer air i run 9.7 9.8 afr even on the track.

 

[BadAssGN]

air temp 58,old school kb big boy front mount.

The problem we are seeing is at near freezing temps. you are still good... 30 degrees is a problem

 

[Mr.Spool]

traction is the only problem i have seen in the coldi haven't run the car in 30 car goes to sleep during the winter.

 

[BadAssGN]

traction is the only problem i have seen in the coldi haven't run the car in 30 car goes to sleep during the winter.

We have seen 30 degree temps at night already... Winter is coming....

 

[Pronto]

You know nothing John Snow.
Seems like the solution would be to block off the intercooler when the temps drop to the 40s.

 

[forzfed]

For those running a 160 t-stat would it help throwing in a 180 for the colder weather?

I think it couldn't hurt. But I would say make sure the coolant lines are hooked up to the throttle body.

For years all the EFI snowmobile guys would always say how there machines would lean out on the ethanol blended fuel. I always thought it was BS. I never had a problem with the ethanol blended fuel, but I also don't run an EFI, so maybe there is some truth to that.