Hello people,

I know that when you activate the 100 octane mode with the USA Cobalt SS/SC version, the shift light come on. But for us Canadians, what will tell me that it is activated? We don't have any shift lights... ahaaaaaa!

Oh and also just a "side" question: When you use the 100 octane mode, would this use LESS the 42 lbs injectors?? I mean... because the gaz has more octane, Im thinking that maybe the injectors have to use less gaz for the same AFR. Because I have the idea of puting a 2.85 or a 2.9 pulley instead of the 2.99" one by GM. Of course Im gonna use a wideband to see if I dont run too lean.

And anybody have ever used the 50 shot of nitrous with a smaller pulley?

 

my car doesnt have a shift light?

and im assuming if its using a 100 octane mode its just changing the timing.

 

Oh I didnt think that some of you in USA have some cobalts with no **** lights. So the only option I guess is to check our Interceptor gage or any which can monitor timing...

 

you should honestly learn more about cars/engines and how they work and why they work before you modify your car anymore.

 

And how did you start learning?

Atleast this guy is on the right track.. and asking halfway decent questions and is doing a little research before he goes and does anything else...

I dont even think you read his post...


anyway.. Thers a couple people with nos running a smaller pulley.. but they either have larger (60pound) injectors, or have a custom tune...

Im not too sure about the injector duty.. i would think though that the extra power the high octane mode is creating, that it would use more fuel.. but thats just an educated guess...

the cool thing about the stage 3 is that it has the NOS algorithm coded into it for a dry shot.. meaning that it will adjust the fuel accordingly depending on the nos output you choose..

a dry system is used for computers like the stage 3 that can mix the fuel in accordingly without it being mixed with fuel first...

a wet nos system uses a seperate tap installed by the user that grabs extra fuel from the rail and mixes it before injecting...

I would guess since the computer has an algorithm coded in, it would compensate for the smaller pulley, and pull timing if neccessary..

 

The speed needle should sweep the dial then go back to zero. Thats when you know its been activated.

Thats what I been told, but the best bet would be for you to call GMPP and get your anwser.

 

stage 3 uses 42s....otherwise you will destroy the engine.

 

Just found this online:



#PPP0002: No Shift Indicator When Set To 100 Octane Mode - Export Only - (Oct 15, 2008)


Subject: No Shift Indicator When Set to 100 Octane Mode - Export Only


Models: 2004 - 2007 Saturn ION Redline Export with a GMPP Stage III Supercharger Kit Installed

2005 - 2007 Chevrolet Cobalt SS Export with a GMPP Stage III Supercharger Kit Installed




--------------------------------------------------------------------------------

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
The shift indicator does not illuminate when switching to 100 octane mode on 2004 - 2007 Saturn ION Redline export (including Canada) and 2005 - 2007 Chevrolet Cobalt SS export (including Canada) equipped with a GM Performance Parts Stage 3 supercharger kit.

Recommendation/Instructions:
The above mentioned export vehicles are built without a shift indicator lamp. On U.S. models, the shift indicator lamp is used as a confirmation to the driver that the ECM has been switched to 100 octane mode. Export models can be switched to 100 octane mode but there will not be an indication to the driver.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


Š 2008 General Motors Corporation. All rights reserved.


In a nutshell, us Canadian SS/SC or Ion Redline owners have no access what so ever for a shiftlight to illuminate to let us know we are in highoctane mode.
Here is the email I got from GMPP/CED a while back.

"We don't have a way to provide visual indication of the high-octane mode to Canadian customers.
Since the lamp command is done over GMLAN, it is not possible for the customer to hardwire in an external lamp or force the function of the in-dash lamp (if present). The SIL command status is not an available parameter on the Tech II data list so a scan tool cannot be used to monitor the lamp command status.
I believe that the parts group will add a note to the Instruction sheet and write a dealer bulletin (PI) to alert the field that this is a normal condition for Canadian vehicles"





What people are doing is that instead of pressing the desired buttons to get in highoctane mode for 10 seconds.

Do it for about 15-20 seconds.

Hope this helps

 

Thanks for helping me out... but I know more than what you think I know about our Cobalts S/C and how they work.

I know already that you have to switch to 60 lbs injectors to be on the safe side when you go with smaller pulleys. The thing is that with the GM Stage 3, the PCM is LOCKED, so you dont have the choice to stay with the 42 lbs/h one. The only thing I can do in order to know if its safe to stay with a 2.85-2.90" pulley is to watch a wideband, something that I will buy in the upcoming months.

Im asking to other people about the smallest pulley size I can choose because I wont buy the 2.85" pulley if everybody is telling me that this is too small for the GM Stage 3. Its just to have an idea to help me decide.

Thanks ShortStack for understanding me. Im not an ignorant person who never look for any infos before talking. I read everyday the posts on this forum to learn from people and I read the most I can about cars and superchargers to understand how our car works. I never read about tuning however, Im poor at this department :P

So in the end, just to make sure that it is activated I just have to press the desired buttons for a longer time. The thing is that I dont have any race gaz near me BUT... I can buy bottles of octane booster. I thought that maybe one bottle for a tank is enough but I dont think that this will bring the resulting octane to 100 but maybe to 97. So damn... this will be boring I wont know right away if the PCM will revert back to 93 if the octane bottles won't be enough I can still monitor the timing...

So anyone have any experience with the GM Stage 3 with smaller pulleys like 2.85 or 2.9"? Ive read that some have smaller pulleys but like just one who say that this is correct. I need more feedback

Thanx all for your answers

P.S.: Red07Coupe, are you also in the cobaltssquebec forum? I think that I saw you there...

 

No man I'm not, I didn't even know a quebec cobalt club existed, but I'll check it out for sure. Best of luck with the pulley issue man.

 

I have the ZZP 2.9 pulley and Stage 3 with the 100 octane mode and it ran just fine. I'm saving up for the dry shot right now. Have to get my clutch in first though

 

ok since when did we have shift lights?

 

One thing, you don't want 60's

 

That octane booster stuff isnt a really good idea.. to be honest...

meth injection is the best way to get your octane up... Honestly, i dont think the octane stuff would even work..

 

okay so i have the stage 3 to and the light wont come on and the speedometer does not sweep but ive thried three different pcu's for the stage three, do u think the 100 octane is working? wat exactly do i do for the steps of turning it on so i know its on???

 

I always thought "100 octane" flashes on the DIC on stage 3?

Either way, what gas are you using? (serious question).. Is it leaded or unleaded?

The steps for turning on the octane mode is to, well.. put 100 octane in your car.

 

um...hasnt leaded gas been illegal for like...30 years now?

 

^^^ What?

Have you not been to a gas station that sells race gas?

 

1. No idea. If there is no shift light I don't know if there is any other way to tell other than the DIC saying the car is in 100 octane mode...

2. Side Question: Octane does not effect the power or AFR only the resistance to detonation. Using 100 octane will not change you AFR or use less gas, it simply allows the ECM to run more timing without getting detonation. Running 100 octane while in 93 octane mode can cause the fuel not to burn correctly and clog the cat or ruin the O2 sensors.

Octane booster is pointless. It only raises octane by .5 per bottle (one "point" of octane is .1). To go from 93 to 100 octane you would need 14 bottles or more of octane booster. If the ECM detects knock while in 100 octane mode it will reduce the timing to the 93 octane tune.

I would see no reason you couldn't run a 2.9 on stage 3. I wouldn't recommend going any smaller than a 2.9, but if you can monitor IDC and knock then you could try going smaller and see if you get knock.

 

no..guys......wen i said how to turn the 100 octane mode "on" i meant wat are the steps to activate it...like you have to hold the cruise and set for like 10-15 seconds or somethng and NO "100 octane mode" doesnt just appear lol...the shift light supposed to come on but mine will not do it and all the dealers around me say they cant get it to work either and ive been through 4 pcus now and tested the light to make sure it worked...but it just wont come on...idk

and yes leaded gas is not sold in the pumps anymore, the only thing is a lead addative that u can purchase to ADD to the unleaded.

AND YA you can GET racing gas through....walmart, any kwik trip either has a pump or you can ask and they can order delivery of some and/or tell u where to get some (i work at kwik trip in wisconsin so that i know for a fact around here anyways)

***********@!!#$@%$#but ya...100 octane mode....how to turn it on b4 ignition, and advice...PLEASE GUYS!$#!%#@!%$#*********

i run the 2.85 on my stage three and it gets me about 17.5 lbs of boost and it doesnt hurt it at all, it doesnt run hot or get heatlock

octane booster= POINTLESS......agreed 100%

and about the clogging the cat and f'in up the o2 sensor if you run 100 octane in 93 octane mode...totally true also...it may give u a little more power because the gas runs slightly hotter and more flambouyant....but after a couple tanks of that in 93 mode will screw things up....dont do it

 

dude cam2 race gas IS LEADED

 

theres a youtube vid of a guy activating 100octane mode in his ion redline. maybe that will help you?

 

i have stage3 if you try to run it in 100 mode on pump gas it will go back to base program it wont hurt it thats the deal with it you cant hurt it. you cant run a smaller pulley its not tuned for it.100 mode and a 50 shot will give you the power you want safely. i never knew i had a shift light till i got stage3. i dont know about your shift light i turn on the cruse push the set button with the key on and the engine not running to turn it on takes about 15 to 20 sec. let me know if that works.

 

The GM stage 3 pulley actually measures at 2.918..... not the advertised 2.99, so a 2.900 pulley is just fine. Also for you stage 3 guys you can turn on the 100 octane mode when sitting at idle with the car on (good to know at a traffic light).

 

Im pretty sure you have to have the 100 octane in the car at the time.... It cant be mixed with any other gas because, well.. the octane would go down.

And actually, there was a thread about only 2 months bak about someone buying leaded racegas, just because it was race gas...

They do have leaded gas, because there are still cars that run that use it. As most race cars use leaded gas, say.. at the track.