So after sitting since wednesday I hop in her today to get some fuel... hit up the Shell by my house to pick up some 93 oct. Now this is my first tank of Shell - I used to run 92 oct right down the block from me.
Fill her up on a bone-dry tank. Driving it around - I pick up my buddy from out of town, we're skipping along and he asks me to get on it... so pulling around a turn in first gear I gun it when i go straight - she moved, but not that quick, WOT shifted second gear with NO wheelspin, not even a chirp!
I'm like WTF? My eyes met my boost gauge and saw 12.5-13 psi... ok... normal...
It is a bit chilly tonite, but I've never had a problem with weather. I drove her wednesday (my first shot to test my new motor mounts) and she was fine, tons of wheelspin all over the place with an aggressive launch - no hop... what i was lookin for.
Does the computer act funny when switching grades? I went from 92 (which it ran fine on) to 93?
I'm not losing boost... she just felt like she didn't want to get up and go. Any ideas?
Andy
05-06-2006, 02:05 AM
The computer will adapt to whatever octane you're using, but going from 92 to 93 would be positive if any difference at all and of course going to lower grades performance will be cut.
Really I don't know what else to say, maybe just a bad day
Clint Burleigh
05-06-2006, 01:17 PM
Maybe a boost leak. Just bc pressure is reading normal doesnt mean a leak is not present. A leak will cause the turbo to work harder and not as efficient causing a drop in performance. Check all clamps. The clamp from the TB to the cold side on the intercooler was hand tight when i checked it.
Ninja-Matic
05-06-2006, 01:34 PM
Aye. I'll have to check all my lines/hoses when I get some more time. I ran her this morning for a bit and she seemed a lot stronger. Dunno if it was because I got a tank of crap gas or the temp drop outside was extremely noticeable. Needed a damned hoodie when I went out last nite, lol.
rice_eater
05-06-2006, 02:25 PM
The computer will adapt to whatever octane you're using, but going from 92 to 93 would be positive if any difference at all and of course going to lower grades performance will be cut.
Not always true. Unless you need higher octane gasoline, going to a higher octane will HURT performance, because the gas will ignite/burn slower. Same effect as having an overly large gap on you spark plugs, cheap wires, bad coilpack, etc.... Higher octane has one purpose and one purpose only... to resist ignition, specifically pre-ignition (detonation). The same effect can be reached by running an engine slightly rich on a slightly lower octane, which also hurts performance if you dont need to. However, on a boosted engine, I would consider 93 octane necessary to get full potential out of it. lower octane gas will not hurt these newer engines, the PCM will just retard timing to the point that there is no detonation (which also hurts performance). So what you need to do is find the right balance point, and that point may be as fine as the difference between 92 and 93 octane, or even as fine as which station you get your gas from. Or, like you said Andy, the car may have just been having a bad day...
BTW.. how much did your passenger weigh??? :D
Andy
05-06-2006, 03:46 PM
Yes but 93 is without a doubt not too much for any SRT-4.
rice_eater
05-06-2006, 03:58 PM
I agree. But that doesnt explain the loss of power... I always fill up at Shell and their gas is the best around here. Maybe his passenger was weighing him down? LOL Seriously though, my car is noticable slower with a full tank of gas vs. a half tank, and even more so with a passenger. Since acceleration is a matter of power to weight ratio and traction (and traction is not the problem, lol he said he had no wheelspin), and since it's doubtful the power output changed that drastically, I'd put my money on the combined weight of a full tank and a passenger slowing him down. Maybe he was just used to the car being lighter/peppier from running on E for so long....
Ninja-Matic
05-07-2006, 02:10 AM
Running on E for so long? Sorry bud, since the fuel is actually used as a "coolant" for the sending unit, I never run under 1/4 tank. I had 3 passengers with me in my car and 3/4 tank of gas last weekend and creamed a 5.0 mustang that thought he could start something (he had 1 passenger). Let's think about this, I was pulling about 10 timing at idle and jumped to 30 or so with a slight goose in neutral. Something is not right. I doubt it that a full tank of gas and a passenger in my car at 0mph will make me pull timing.
I'm leaning towards fuel. You have no idea how much condensation builds up in those tanks at a gas station when they are going empty. Lots of water from the condensation in my fuel will cause that.
And yes. Barely a few chirps when I launch from a dig and no wheelspin at all WOT into second. After I put my mounts in last saturday I couldn't grab traction until second gear.
You're right. I'm just used to being a jew and not buying gas and having noone in my car. Don't go around playing games and thinking other people are morons, m'kay? If you actually think a full tank of gas and 1 passenger will make THAT much of a difference, I'd rethink the who you're trying to talk down on. It would behoove you to understand more about cars before making YOURSELF look like the moron.
Mmmmmmmmmmkaaaaaaaaaaaaaaaay?
Goodie.
Ninja-Matic
05-07-2006, 02:13 AM
Yes but 93 is without a doubt not too much for any SRT-4.S3 ECU without toys will properly adjust timing and A/F with high octane fuel. Big power gains, no toys needed. Not sure about other stages but we tested it with three S3 SRT-4's locally.
Clint Burleigh
05-07-2006, 01:59 PM
Running on E for so long? Sorry bud, since the fuel is actually used as a "coolant" for the sending unit, I never run under 1/4 tank. I had 3 passengers with me in my car and 3/4 tank of gas last weekend and creamed a 5.0 mustang that thought he could start something (he had 1 passenger). Let's think about this, I was pulling about 10 timing at idle and jumped to 30 or so with a slight goose in neutral. Something is not right. I doubt it that a full tank of gas and a passenger in my car at 0mph will make me pull timing.
I'm leaning towards fuel. You have no idea how much condensation builds up in those tanks at a gas station when they are going empty. Lots of water from the condensation in my fuel will cause that.
And yes. Barely a few chirps when I launch from a dig and no wheelspin at all WOT into second. After I put my mounts in last saturday I couldn't grab traction until second gear.
You're right. I'm just used to being a jew and not buying gas and having noone in my car. Don't go around playing games and thinking other people are morons, m'kay? If you actually think a full tank of gas and 1 passenger will make THAT much of a difference, I'd rethink the who you're trying to talk down on. It would behoove you to understand more about cars before making YOURSELF look like the moron.
Mmmmmmmmmmkaaaaaaaaaaaaaaaay?
Goodie.
My car does the exact same thing. Timing is about 6-15 at idle when warm and will jump up to 30+ when in neutral and revving. No load equals high timing...
rice_eater
05-07-2006, 03:02 PM
Running on E for so long? Sorry bud, since the fuel is actually used as a "coolant" for the sending unit, I never run under 1/4 tank. I had 3 passengers with me in my car and 3/4 tank of gas last weekend and creamed a 5.0 mustang that thought he could start something (he had 1 passenger). Let's think about this, I was pulling about 10 timing at idle and jumped to 30 or so with a slight goose in neutral. Something is not right. I doubt it that a full tank of gas and a passenger in my car at 0mph will make me pull timing.
I'm leaning towards fuel. You have no idea how much condensation builds up in those tanks at a gas station when they are going empty. Lots of water from the condensation in my fuel will cause that.
And yes. Barely a few chirps when I launch from a dig and no wheelspin at all WOT into second. After I put my mounts in last saturday I couldn't grab traction until second gOear.
You're right. I'm just used to being a jew and not buying gas and having noone in my car. Don't go around playing games and thinking other people are morons, m'kay? If you actually think a full tank of gas and 1 passenger will make THAT much of a difference, I'd rethink the who you're trying to talk down on. It would behoove you to understand more about cars before making YOURSELF look like the moron.
Mmmmmmmmmmkaaaaaaaaaaaaaaaay?
Goodie.
Ok... I guess I'm sorry for offending you and I retract whatever I said that pissed you off so much. I was not talking down to you (what reason would I have to talk down to you???), simply offering my imput/opinion. I did not say you had to agree with it, if not, fine... but you dont need to jump down my throat about it. So you got crap gas, I was wrong, you were right. Does that make you happy? I dont own an SRT-4.... I dont know exactly how they are/arent supposed to act. I was simply stating an idea. My car is not a torque monster like the SRT-4.... So I DO notice a difference with a full tank vs 1/4 tank of gas or with/without a passenger. Quite a large difference actually. I did not know if that difference was or was not noticable on an SRT-4, I was just offering a possibility. But sure, call me a moron for offering imput. I forgot you MUST own an SRT-4 to post in this section... I'll stay off your precious thread from now on.
BTW... you never mentioned your timing before that last post, how was I supposed to take that into account? Read your mind?
elchicoyes
05-07-2006, 03:58 PM
What's with all this hostility?
Andy
05-07-2006, 05:18 PM
What's with all this hostility?
LOL... I dunno, I think Ninja just took rice eaters post the wrong way
Ninja-Matic
05-07-2006, 05:34 PM
I apologize for being an ass Rice... I've had a bad weekend and nothing pisses me off more than when something is wrong with my slingshot. A lot on my mind lately.
Sorry to everyone else for reading that post as well. I've got a lot on my mind lately.
rice_eater
05-08-2006, 04:38 PM
Its alright, I was harsher than i needed to be as well. No hard feelings man, I dont hold grudges... Hope you get that black beauty up and running right soon.
Did you try some fuel additives to rule out crap gas? (iso-heet, octane booster, fuel system cleaner, etc..) I had a tank of crap gas last summer... really crappy, like 6 month old just bought a car that had been parked for half a year gas.... I dumped in a pint of some wicked stuff, I think its called Kano-Kreen, and that cleared everything right up. This stuff was so potent I could smell it in my intake 2 weeks later when I swapped to a bigger TB. Definetly better than anything you'll find at wal-mart. Just a suggestion.
Ninja-Matic
05-08-2006, 08:30 PM
I haven't tried any yet. I've just been running her to get the bad fuel out. It's not hurting anything, so I'll just have to full up when the empty light comes back on. She's back at the dealer for a noise that's been bugging me. Like a loose bike chain or something. And to have the motor mounts looked at. Apparently they've seated and when I downshift and decel hard, or accel hard or throw it in reverse (anything that causes the motor to shift direction in it's cradle) I can hear 1 mount move and knock as it gets pushed against one of it's bolts. Not anything bad, but I know it has to be the mounts... another AGP user had the same issue until he re-torqued the bolts. Since I don't have a jack and jack-stands readily available to me, they're just gonna snug them up for me when they have it in the air.
But on a better note... the wifey and I just sold our house tonite! :D We'll be moved in to our new cribbage by the end of July. That means my tools, jack, stands, compressor and everything else tool-related comes back to me from storage! MUWAHAHAHAHA!
