Hello all. I have a 95 Z28 automatic with 3.23 rearend. I have a 97 motor with 20,000 miles in it now but with the OBD1 computer and related parts. I am thinking about doing the cheaper easy mods first just so I know I can go out and stomp anything stock from Ford. My ideas are Flowmaster american thunder, some sort of CAI and possibly bigger injectors. So my question is would bigger injectors be worth the cost on a stock engine as long as it is breathing better and if so what size?? Also, I don't care about looks but with CAI performs best. Also, just as a poll assuming equal drivers would that stuff be enough to put away a stock Cobra up through 2002?? Thanks everyone for your help on this

 

well that all sounds good exept for the injectors you dont really need them on a stock motor, they are not going to do anything. I have the american thunder system and its great I recomend an ORP, unless emissions are bad where you live. and the morroso CIA is good but the one thing to look for is that you get a good filter not a cheap one. the design of the CIA does not matter nearly as much as the filter.

 

Even most Cobras have a hard time pulling better than a very high 13 or low 14.

 

I would say that you would need more than that to out run a 2000+ Cobra. Theres a guy near where I live that has an 01 I think. And with the mods in my sig, I just barely pull on this guy. I dont think his his stock anyways. It at least has Borla exhaust and maybe some other things but they are fast. If I were you I would get the CAI, maye some headers, and instead of getting the american thunder system, just cut off your cats and put a bullet muffler where your i pipe is and end your exhaust underneath the car. You will see better gains from this than the flowmaster cat back system. There are lots of things to add power it just depends on how much money you want to spend! Good luck.

 

w0w... didn't really expect such a fast reply. Thanks already, forgot to mention since the new engine was put in, there's not smog pump and the aftermarket hi-flow cat on it was gutted out. There's no emissions in Indiana Just wondering what is "ORP"???

 

I hope you're not spraying the 125 shot when you just barely pull on him.

 

Buddy theres only 2 cobra's you have to worry about, and thats a Cobra R and a SVT Cobra (Both supercharged) THe other cobras came with either 305-320HP depending on the year and run the quater mile in about a 14.2-14.4 Stock a LT1 runs anywhere from 13.5-13.8. Those 5.0 and 4.6 liters just don;t have the Torque that the LT1 or LS1 has. there 281CI motors can't keep up with our 350CI motor. Before my brother got his LS1 SS, he had a black Cobra yea it was preety fast had some bolt-on's we raced a STOCK LT1 one night and he put 2 cars on us. Then we starting liking F-BODYS

 

No way! Just on motor. There are some new cobras that are really fast. They also weigh less than our camaros do. Dont get me wrong, Im a camaro fan all the way or I wouldnt have one. But you do have to watch out for some of those ponies.

 

A few misconceptions here:

SVT has been making the Cobra for an awfully long time (mid-90s?). The R was an NA 385hp 4V 5.4. The only SC'd Cobra so far is the 03. And don't knock those little engines either. 4V heads have incredible potential since they have more valve curtain area and hence, can flow massive amounts of air (especially under boost--> look at the power Supra's can make with their 4V heads). They aren't that big or too fast from the factory, but the technology behind them is just powerful in itself. The 99+s are pretty stout. Especially when some of those freaks put the 4V heads on built 5.4L engines

At sea level, LT1s average 13.8 to 14.2 at 98-100 mph with good driving.

Pre-99s aren't too bad, you'll hang with them nicely and then some with bolt-ons. The 99+ are the ones you'll have to worry about.

 

The Cobra R is not supercharged, it is a naturally aspirated 5.4 liter. Also, all Cobras are SVT Cobras and are all naturally aspirated as well(except '03s). 13.5-13.8 for a stock LT1? Maybe a few freaks, but the majority are 13.8-14.2 bone stock.

Back on topic though, you do not need new injectors for the amount of power that you will be putting out with a CAI and catback. I have a K&N CAI, but they all perform very closely except for the G2. K&N, Moroso, and SLP CAIs are all good products. If you're shooting for a newer Cobra, you'll need atleast the CAI and catback as well as traction to hang. Next you should look at a converter, headers, and gears as money will allow. Good luck on your quest.

 

Once again, thanks everyone. I never thought of the converter doing any good. I'm just a young pup, usually when I think of converters I think of cars with giant cams runnning in the 9's. So something like a 2000 RPM???

 

I would go with atleast a 2400-2600 stall. A friend of mine had a 3500 stall in his bolt on Formula and it worked very well. Some people see up to a .5 gain in the 1/4 from a converter. It's money well spent if you ask me.

 

Converters may help at the track but they make everyday drivability a pain.

 

well I know a guy who owns last years model cobra with the 32 valves etc... it was brand new, he raced me when I was stock & my other buddy with his 96 Camaro SS he couldn't beat us, off the line us being bone stock to the air filter, we killed him off the line & would pull on him the whole way, so yeah thats pathetic

 

How do you figure? I had a 91 Formula with a 2400 stall and I drove my friend's 94 Forumla with the 3500 stall several times. Neither had any drivability issues at all. A higher stall should drive close to stock with average driving.