Hey,

I'm thinking about getting a Cobalt and was curious what kind of times I could pull in the 1/4 mile with full bolt ons with tuning, some headwork, and some PnP?

Thanks guys.

 

Staying street legal with all the work possible on this car you could get into the 11's.

 

11's damn. I was going to say with a 2.2 with full bolt ons, maybe mid 13's with slicks. But i'm probably wrong.

 

i can see 11's with all mods done to the car

 

What about an all motor monster?
I was thinking about this for a while then decided to go turbo, but I'd still like to see someone do an all motor build.
There are hondas with 1.6L engines all motor putting down 11's and 12's at the track, I don't see why our motors couldn't do that too.

 

The Honda's that are running those times are not real street trim, they did motor swaps, the cars themselves are capable of running times like that because of the crazy power band they have. Rev that **** to 8-9k. Our displacement may not allow such a thing.

 

Stupid little lawnmower cars... I need a smaller engine! :P

 

The most our cars can do street legally is about 325 HP. It has to do with gasoline. 93 Octane is the best they sell at the pump. And with that, the most our cars will make is around 325HP using a high quality turbo system. The engine can certainly handle more and you can use higher octane race gas, but now you aren't street legal anymore.

You can build your engine to be able to handle up to 500 HP and still be street legal. You just use pump gas for everyday use, knowing that you are only getting 325. Then for those trips to the track, gas up with race gas. Above 500, you need to change the ignition system. The factory coil on plug system overvolts when you crank to that level. You then have to switch to a traditional distributor and wire system, which will not pass emissions testing.

Getting to 500 however is expensive. You need to do the GMPP head gasket kit with the special block machining and o-ring installation. You should also switch to head studs instead of bolts. That is very expensive, as you will have to completely disassemble your engine to get the block machined. The stock head gasket can get you to around 400HP safely.

 

You are a fountain of information HalfCent

You got the 2.2L auto too right? and I know u're building a turbo car... I am going this route too (if I don't just swap in a bigger motor) when I'm ready to build, you'll be the first to know bro!

 

are you serious that our cars will become no longer street legal around 325? and is that whp?

 

Yeah, thats about right. Like I said, it has to do with the gas, not the car. With the highest legally allowed octane sold at the pumps, the most our engines are going to make is around that 325 number. You just can't boost it anymore, otherwise you start getting detonation. Like I said, the engine can handle higher octane gas and much higher horse power levels, but you have to use non-street legal high octane race gas to do it.

Just as an aside, for those that don't know it, Octane rating is a rating of the gasolines stability. How much can you compress it and heat it before it actually burns. It doesn't have to do with how powerful the gas is. The greater power achieved from higher octane fuel is a function of the engine taking advantage of that stability and compressing the fuel more before igniting it. If you compress it too much, the fuel explodes instead of burns, called detonation. That's bad, tends to make things go boom.

 

why is that? i mean how do these street supras and evo's go on 800 hp and still stay street legal and run on pump gas, is our engine just a bad design or what?

 

Trust me, they are not doing 800 HP and still being street and emissions legal. I'm talking completely legal here. A car that you can fill up with pump gas and still pass an emissions test. I'm sure their cars are capable of that kind of power, but if they are doing it on the street, then they are either illegally running on race gas, or have non-emissions legal modifications done to their cars. Its not that uncommon. People break the law all the time. And brand new cars don't have to be emissions tested for 5 years (at least in Illinois), so they can get away with it for that long and nobody would ever know.

 

i see now, so in ur opinon with 325 whp what do you think we can run, i would really like to see 12's in my car in street form...

 

Probably would be pretty close, but not quite a 12 second street legal car. If you put drags on the front end, no problem, but now you gotta make sure you have street legal drag tires.

Take that same car, put the tires on it, fill it up with 110 octane, adjust your Greddy fuel computer accordingly, and you've got 11's no problem. Then filler' up with pump gas, change the tires back, and drive it home legally.

 

325 horse should net around low 13s I would imagine.

 

well ill probably only tune my car for street since i have thie weird idea in my head that whatever i run at the track is what i run all day everyday, but at least ill know that i could be alot faster and so will everyone else so thats cool i guess, i still cant wait to see what my times are right now close to stock plus on march 25th ill see what my whp is when i go to the dyno for a baseline on a dyno jet

 

Well, I'm assuming that those numbers you were talking about are with forced induction. What kind of times could I get going N/A? Full bolt ons, headwork, PnP, etc.

 

prolly 170ish whp I'd say, good for a flat 15 at least

 

why is that? i mean how do these street supras and evo's go on 800 hp and still stay street legal and run on pump gas, is our engine just a bad design or what

toyota inline 6 is just a badass monster and it dont need 15k to put out 800hp

 

Not to be mean Halfcent but where did you come up with 325hp on pump gas from??? There are SRT-4's making more then that on pump gas daily driven. Most make around 400hp.

 

Those are the preliminary numbers I'm getting from Hahn for the build on my car. My design was to have a completely street legal car making the most reliable power possible, and that number seems to be 325. Then, when I want to go to the track, I flip the switch on the computer, put in the high octane juice, and I'm off to the races.

 

yeh those supra's and evo's arent street legal if theyve got that much power in their hands. im just gonna turbo/bolt up mod my 2.2 and go for the 325. once i hit that i might move to a new project =) but thats waay in the future. turbo hasnt really come out yet haha