10.1 afr

[red2005ss]

Well got off my lazy ass and put the wideband on my 05 cobalt ss/sc
wide open throttle in 1st,2nd,3rd always went to 10.1 to 10.4.
Since i have no means of tuning right now, I think i will run a dry 25 shot of nitrous.
Give me your opinions please.

[bc3tech]

other option is to use a slightly smaller pulley - that's why it's possible to do so w/o really worrying about things, and also why just tuning the car while doing nothing else yields really nice HP gains. they run quite rich stock.

[Cat Ion]

That is real rich! Are you sure you calibrated the wideband properly before installing it? Not questioning your abilities. Mine ran 10.9 stock and leaned out to 11.5 when I went stage 2. I would like to see 12:1 AFR. More tuning to come.

[Doc]

when does the afr hit 10's..?? that would be the key to when you hit it with the juice. A smaller pulley is always an option too.

[red2005ss]

when does the afr hit 10's..?? that would be the key to when you hit it with the juice. A smaller pulley is always an option too.


It hit right at 4500 and stay's all the way to redline in 2,3,4

That is real rich! Are you sure you calibrated the wideband properly before installing it? Not questioning your abilities. Mine ran 10.9 stock and leaned out to 11.5 when I went stage 2. I would like to see 12:1 AFR. More tuning to come.


We did a free air calibration, then tried it,wasn't ssure of the reading so we did it again to make sure.
Same result both times

other option is to use a slightly smaller pulley - that's why it's possible to do so w/o really worrying about things, and also why just tuning the car while doing nothing else yields really nice HP gains. they run quite rich stock.


What size pulley do you suggest i start with?

[Doc]

I think you're getting accurate numbers from the LM1.
I don't think nitrous would benefit you unless you had a way to get it richer earlier...like around 1900.
I would try a 3.1 personally....watch it above 5k specifically...I bet you get leaner below like the 1800-3700 range if you did move to a 3.1

[red2005ss]

Thanks Doc I will check into getting a pulley.

[RL_Clark]

When I asked about this on RLF, I was told that a smaller pulley wouldn't affect the AFR because the computer will adjust for it, and just push more fuel in?? And, that the way to correct for it was to tune. If you watch my Stage II dyno vid, you'll see that I'm running a mid-10 AFR too:
iIM7vHaDAW
edit: I just watched that video again, it's actually fairly lean until the higher RPM's then it comes down to around 10.7ish, then all the way down to 10.1ish.

[Doc]

I should go and prove this....I have a 2.5, 2.6, 2.7 and 2.8 pulleys. or disprove it...

[RL_Clark]

I should go and prove this....I have a 2.5, 2.6, 2.7 and 2.8 pulleys. or disprove it...

Please, feel free to if you wish. I'd love to know if the ECU really does adjust for that. I didn't think it would, but this is just what the RLF people told me.
I'm just relaying a message.

[rlinbatonrouge]

I am thinking of raising back to a 3.0 pulley and going with a 35 wet shot. I want the cooling effect of the silly spray, but I don't like the idea of pulling some fuel pressure when spraying. I plan on dynoing with a 2.8 and then a 3.0 to see exactly the gain before deciding. Someday soon.....

[bc3tech]

I am thinking of raising back to a 3.0 pulley and going with a 35 wet shot. I want the cooling effect of the silly spray, but I don't like the idea of pulling some fuel pressure when spraying. I plan on dynoing with a 2.8 and then a 3.0 to see exactly the gain before deciding. Someday soon.....
i don't understand your logic of not wanting to pull fuel pressure, but going w/ a wet shot... unless i misunderstood ya.

[rlinbatonrouge]

I'm hearing that fuel pressure is already dropping at WOT and causing the AFR's to begin richining up. Now, if I add another nozzel that will lessen fuel pressure across the system, right? Law of fluid dynamics, IIRC. So now I have a fuel pump maxing out pressure at a lower time than before on a fuel system that is already leaning out and shooting nitrous into the mix.

Besides, what is the real increase in HP from a 3.0 to a 2.8 after you take into consideration the higher IAT2's?

[bc3tech]

I'm hearing that fuel pressure is already dropping at WOT and causing the AFR's to begin richining up. Now, if I add another nozzel that will lessen fuel pressure across the system, right? Law of fluid dynamics, IIRC. So now I have a fuel pump maxing out pressure at a lower time than before on a fuel system that is already leaning out and shooting nitrous into the mix.

Besides, what is the real increase in HP from a 3.0 to a 2.8 after you take into consideration the higher IAT2's?
right i understand that, but you said you're thinking of a wet shot, but don't want to decrease fuel pressure.... gotta make up your mind, woman.

[rlinbatonrouge]

right i understand that, but you said you're thinking of a wet shot, but don't want to decrease fuel pressure.... gotta make up your mind, woman.

THAT'S MY REASON for the bigger pulley, Dummy. OMG.....

This is turning in the shortbus already....:rofl:

[bc3tech]

THAT'S MY REASON for the bigger pulley, Dummy. OMG.....

This is turning in the shortbus already....:rofl:
maybe the prob is that you're used to posting on there so you're assuming we're at the same level of intelligence... when we require properly formed and coherent sentences & paragraphs. :p

has anybody w/ a H/E ever done one of the n2o cooling bars? or co2 ones for that matter? i think one of y'all should try that shit out. or just ditch the heaton & go w/ a procharger & avoid heat soak altogether :p

[rlinbatonrouge]

maybe the prob is that you're used to posting on there so you're assuming we're at the same level of intelligence... when we require properly formed and coherent sentences & paragraphs. :p

has anybody w/ a H/E ever done one of the n2o cooling bars? or co2 ones for that matter? i think one of y'all should try that shit out. or just ditch the heaton & go w/ a procharger & avoid heat soak altogether :p

HEHEHE.

I think the spray bars are a joke. There is no way that I can think of that will reduce IAT2's more than nitrous directly in the intake. Cooling the HE will help, but straight in the charge should help more. Plus, it will give you HP not just help you reclaim lost HP from heatsoak.

[bc3tech]

HEHEHE.

I think the spray bars are a joke. There is no way that I can think of that will reduce IAT2's more than nitrous directly in the intake. Cooling the HE will help, but straight in the charge should help more. Plus, it will give you HP not just help you reclaim lost HP from heatsoak.
then go w/ the procharger kit that SMP's fabbing up as we speak- it's nearly complete for the LSJ.

[rlinbatonrouge]

then go w/ the procharger kit that SMP's fabbing up as we speak- it's nearly complete for the LSJ.

That's a great idea if I wanted to spend the money. Everything is already paid for with the juice though.

[bc3tech]

That's a great idea if I wanted to spend the money. Everything is already paid for with the juice though.
well then 'gratz on being the pioneer :) keep us updated :D

[RL_Clark]

I have a Garrett h/e, and it's working great. It's doing a wonderful job of taking up space on my bedroom floor.
Since I was having coolant leak issues, I opted not to istall it yet. However, when I buy my GMPP Extrude Honed Mani and GMPP Sport exhaust, I'll take a day off to install exhaust and h/e. I'm really curious to see how much of a difference it will make in my IAT2's as they're averaging around 145 now. Sometimes I see high 160's (at a stoplight mid day), and sometimes I see 120's (running 70 late night/early morning). As for the cooling spray thing...I don't know.
Good luck with the nitrous.

[rlinbatonrouge]

I have a Garrett h/e, and it's working great. It's doing a wonderful job of taking up space on my bedroom floor.
Since I was having coolant leak issues, I opted not to istall it yet. However, when I buy my GMPP Extrude Honed Mani and GMPP Sport exhaust, I'll take a day off to install exhaust and h/e. I'm really curious to see how much of a difference it will make in my IAT2's as they're averaging around 145 now. Sometimes I see high 160's (at a stoplight mid day), and sometimes I see 120's (running 70 late night/early morning). As for the cooling spray thing...I don't know.
Good luck with the nitrous.

Big drop in temps. We have about the same temperatures down here. I now run like 120 IAT2 at most when sitting at idle and I used to hit 140+

[RL_Clark]

In that case, I need to get this on SOON!

[rlinbatonrouge]

In that case, I need to get this on SOON!

It was a MAJOR difference for me.

[Doc]

has anybody w/ a H/E ever done one of the n2o cooling bars? or co2 ones for that matter? i think one of y'all should try that shit out. or just ditch the heaton & go w/ a procharger & avoid heat soak altogether :p

I had a fire extinguisher I used. While it was on the dyno I pulled out the fire extinguisher and let it loose, it was CO2, and the temps dropped dramatically, more than 40 degrees. Not sure if it cooled the front H/E or everything at once. I got excited and it only lasted once :lol:

[red2005ss]

I think i will try a 35 shot in front of the tb. Hopefully it will lean out.
Would of had it done sooner but had to finish up painting a truck today.
i will try tomorrow

[rlinbatonrouge]

I had a fire extinguisher I used. While it was on the dyno I pulled out the fire extinguisher and let it loose, it was CO2, and the temps dropped dramatically, more than 40 degrees. Not sure if it cooled the front H/E or everything at once. I got excited and it only lasted once :lol:

Somehow I don't think I could do this on the track.....

[bc3tech]

Somehow I don't think I could do this on the track.....
y not, they do it on PINKS all the time :no:

[Doc]

you can do it at the track, just not on the line....;)
just have someone spray it into the front prior to your burn out of just prior to staging

[rlinbatonrouge]

you can do it at the track, just not on the line....;)
just have someone spray it into the front prior to your burn out of just prior to staging

You aren't serious, are you? They would kick me out of the track just on principle.

[Doc]

Thats cos you drive a 4 door :lol:

I am serious...I've seen weirder things happen at the track.

[rlinbatonrouge]

Thats cos you drive a 4 door :lol:

I am serious...I've seen weirder things happen at the track.

I saw a truck line up once but they wouldn't let him run until he emptied all the old beer cans out of the bed first. Then he streaked across with an impressive 17.something.

Still, they would kick me out at my normal track. Now there is another one that has no rules and regulations and they may not mind, but still.......

[Area47]

for every action, there is an opposite and equal reaction.

lean the car out, you're hosing down the cylinder walls with fuel. piston rings, tend to frown on this type of lubrication.