Pyros777

iTrader: (4)

When I was dealing with my misfiring issues, GM S3 still gave me a P0300 CEL, so yes I think it should. Cant say 100% for all codes though.

ShortStack

If you have less air being sucked in, how will it make more boost? you would need more air to make more boost...

Staged07SS

iTrader: (25)

^ i meant that, but got my wording backwords .....

BCobaltSS

I will have to make sure it's not just an 05 thing. Does you light turn off for the 100 octane mode everytime you turn your car off?

Pyros777

iTrader: (4)

Yes, but that is normal functionality.

BCobaltSS

ah ok. well let me give it a shot next time I drive my car

Staged07SS

iTrader: (25)

I thought I would give a review of my GM Stage 3 experience, and the fantastic performance it provides vs. GM Stage 2. Well, over the past couple of months I purchased GMS3 parts (76mm pulley, Opt. B, etc.), and I was content on leaving my car running on the 07' GM STG Tune that came with my GMS2 kit. I figured whats the difference if I have the 07' GM STG Tune or the GMS3 Tune. I had the 76mm blower pulley and intercooler upgrades, I should run just as good as a true GMS3 car right ? Wrong. After installing my GMS3 PCM, I learned that the GMS3 tune is a true step up from GMS2. It runs soo much smoother, and pulls a good deal harder. 4th gear pulls like 3rd gear used to pull, so you can imagine what the other gears pull like now. Also, there are no more worries about hitting the limiter in 1st gear with the rev limiter increased to 7250rpm. The increased limiter also helps keep the car in its sweet spot when getting on it !! Another improvement of the GMS3 tune vs. my 07' GM STG Tune is the more aggresive a/f ratio. My 07' GM STG Tunes's a/f ratio was 10.8, and my GMS3 Tunes's a/f ratio avg. 11.4. Someone mentioned in this thread, that if you were to place a GMS2 car against a GMS3 car with similar mods the S3 car would pull a car or so on the S2 car. I agree with that statement 100%. To all that haven't experienced an lsj running GMS3, I highly recommend that you do. I can't wait to see how my baby runs on high octane mode

BCobaltSS

Glad you like it. Oh by the way if you have a Sunoco by you that sells 93 ultra octane( used to be 94) .Put the 93($2.75per gallon) in and turn on the 100 octane mode. It will work. instead of having to buy the $5.99 per gallon 100octane unleaded.

I noticed that you are running water wetter. Were you using this in your pulls . Are you running stock plugs ?

I noticed now I get no traction at the track. On the street 1st gear is a joke . nothing but spinning the tires at WOT.

I wanted to get the nitro kit for it but now I think that drag radials would be better.

Staged07SS

iTrader: (25)

It will work ?? That's friggin awesome, because that's all i run in my car !!! i will try it today. I run a 65/35 mix (65% water 35% Dexcool) + RL water wetter in my stock heat exchanger with the Opt. B kit. All my pulls were done with the mods in my sig, and I'am still on the stock NGK iridiums (gapped at 0.035") that came on my car when i ordered it. Yeah, first gear is deff a joke. I still can't believe how much better the STG3 tune is vs. the STG2 tune. I love it !!!

ShortStack

stock plugs are platinum.

Staged07SS

iTrader: (25)

no ****, but my car came with iridium. i have had this argument before. i ordered my car. no one else had it but me.

IFR6V-10G ngk laser iridium (with ac delco stamped on them) thats my plug number / plug that came in my car.

Also, you can go on ngk's website. 2005/2006 cobalt ss/sc's come up as the pfr6t-10g or the platnimum plugs. 2007 cobalt ss/sc's come up as the plug i stated i have the ifr6v-10g.

ShortStack

you are sure fiesty.

Just because YOUR stock plugs were different, doesnt mean that it makes it the actual stock plug for the car.

"Stock NGK iridiums" is a mis statement. Because our stock ngk are platinum.

You should say "My NGK plugs wre gapped at so and so".

Staged07SS

iTrader: (25)

I'm only fiesty, because you are saying im wrong on something i know is right. You have a 2005 SS/SC. Things changed my friend. My factory plugs are the ones I stated. They are the ones I pulled to look at the day I bought my car, and they are the ones that are still on my car. They are NGK Laser Iridium plugs with AC Delco stamped on them along with an AC Delco part number/NGK part number . Just because they werent the stock plug in 2005 and 2006 doesnt mean GM cant change what the stock plug should be. My 07' is a late model 07', that could be why I have iridiums. This is a Stage 3 thread, and I will not cont. to bicker and clog up this thread with you. If you want to cont. this debate feel free to PM me, or cont. to believe that just because your owners manual says Platnium Plugs are stock they must be the only ones GM can use on our cars from the factory.

Now, back on the STG3 topic ....

BCobaltSS: I tried the high octane mode on the way home from work today, and I can't believe the difference it makes !! Also, I logged zero knock all the way home (while driving spirited) on Sunoco Ultra 93 !! Thanks for the great tip man I was afraid to try it out, even though I know the STG3 PCM will shut the high octane mode off if it reads excessive knock.

Update: I made a wide open throttle run on high octane mode (while running Sunoco Ultra 93), and in 2nd gear around 6 grand the car experienced knock and the STG3 PCM pulled the high octane mode (as expected). Just feeling the extra power in the lower rpms before knock occured makes me want to by a 5 gallon gas can so i can fill up on Sunoco 100 race gas, and run high octane mode !!

distillion

i tried using 94 with highoctane.
didint work.

smashed it in 5th, foot to the floor.
saw instant kr, all the way up to 6 * through the band.

im canadian so my car dosnt tell me when the high octane mode is on.

tried it again, and got 0 kr, which tells me my pcm went back to the 93 tune due to excessive knock.

I havnt tried in any other gears (WOT), dont think i will.
i used 100 octane before with this car and it made a very nice diff, and ill do it again here and there.

running 100 octane mode with 93- 94 isnt smart tho imo.

Staged07SS

iTrader: (25)

ohh i know man .... i just thought i would give it a shot. i didn't really beat on it, and soon as my car read 4* of kr it pulled the high octane mode instantly (it actually took all the way to 6k rpm before i saw kr). I will be filling up with Sunoco 260 GT100 (100 octane) very soon, because i found a station thats only 50 miles from my house. I will also be filling up my 5 gallon gas can to replenish the 100 octane when I return home from the ride. I can't wait to see how she runs

distillion

she runs amazing when in high octane mode with 100 octane.
you will notice the diff.

BCobaltSS

Wait a second . So the 93 ultra sunoco will work from what you are saying but don't do it since there is a high degreee of knock in the higher RPM and to stick with the 100 octane if you are going to run the higher octane mode?

distillion

yep, you can enabable the tune, but if you use it without the proper fuel, it will knock and it will reset back to the 93 tune.

Staged07SS

iTrader: (25)

x2 !! I tried it even though I knew the S3 PCM would pull high octane mode once it detected knock. My car didn't start to detect knock until 6k in 2nd gear. It hit 4* KR and pulled the high octane mode. Deff. a nice safety feature, and I deff. can't wait to fill up on Sunoco 260 GT100 so I can run high octane mode

Side Note: Has anyone dynoed a GM Stage 3 car on high octane mode? I wonder what it would put down. I'm guessing 255-260whp with supporting mods (ie. intake & exhaust).

distillion

this winter im swtiching to the dynotune nitrous setup
Zex dosnt seem to like the stage 3 pcm...
always had issues with the mode shutting down due to the zex control module.
i will however still use the zex heater, and purge system still.
no sense on replacing those, just the guts of it all, and ill probably use the dynotune bottle and the opener, meh, you live and learn.
when it did decide to work for a lil i made 270 tq at 3 grand, then it shut down and i was mad.
lol
stay tuned.

BCobaltSS

If it sences knock it will shut the light off and go back to 93 octane mode. With 93Ultra my light does not shut off and I've had it up past 7000rpm many of times.Right now it is in 100 octane mode and I have gone through 3 tanks of 93 ultra since the 100 octance has been in.The light still does not shut off. It's getting colder where I live and come November I will eb putting the winter tires and stock ECU back in . Don't want to risk running too lean.

Staged07SS

iTrader: (25)

I ran Sunoco "Ultra 93". My car detected 4*KR at 6000rpm in 2nd gear, and shut high octane mode of instantly. You must still have some high octane floating around in your tank. That's prob. why your car hasn't detected knock yet. I've never ran anything higher/lower than 93 in my car. We will see how she runs once I put 100 octane in her in the near future

BCobaltSS

Interesting. I'm about to fill up my last tank of the year with 93 ultra . We will see if there is anything left in the tank for 100 octane .

After this tank it's back to the Stock ECU.

Staged07SS

iTrader: (25)

why are you putting the stock ecu back in ? or do you mean you will be turning off high octane mode and going back to the standard gm stage 3 tune.

BCobaltSS

I live in MI and the gas stations switch over to winter gas around now(which is crap) . The GMS3 ECU leans out the mixture and is great for the summer but with the extreme dense cold air that is rushed into the intake and the degree of knock that the lack of octane there is in the winter gas. I switch back to the stock ECU for the winter time that has the GMS2 tune on it that was tested for normal drving all seasons instead of one for off road applications