redlt1z28

Well i am just bored and i thought about this question. It might be kinda hard to answer and might cause a argument but just asking opinions.

Who do you think would win in the 1/4 on the street?...

03 Cobra w/ all bolt ons including pulley VS. 99 Z28 A4 w/ all bolt ons with a stall and vortech supercharger running 8psi?

Capn Pete

If you can hook the Z, I say it takes the win. I'd like to think that running 8 psi boost on the LS1 will give it at least ~390 HP, if not more! Obviously only a race will tell though.

Smokn '94 Z

If you have pullies on the '03 Cobra like you said then the Cobra would not be easy to beat. An '03 Cobra with all the bolt ons & Pullies will dyno close to 500 RWHP. That would ge a hard # to match with a stock block LS1 with a blower...

ULTIMTEORANGESS

not true a stock block bottomed end ls1 can handle well over 500 rwhp.lower the CR and with a good tune even more.


ls1s dont need the same amount of hp to run what a cobra does but to equal its max hp capability itll require extensive internal modifications.

Smokn '94 Z

So your saying a Stock LS1 pushing 500rwhp through it via boost will hold up against an '03 Cobra with forged internals pushing 500 rwhp via boost run after run after run? I guess I'd have to see it. I don't see the LS1 making a 1/4 of the WOT runs that a '03 Cobra can on their respected bottom ends. I am an LS1 fan & am amazed by how they perform but they are not bullit proof by any means. Sure it will hold up for a little while but not long enough for the risks IMO....

ULTIMTEORANGESS

ask harlan how his TT stock motored ls1 held up.

scott9050

I agree and I want to see an internally stock LS-1 make 500+ rwhp with just a blower added. I don't see it happening and the rear end sure as hell is not going to hold up. And while you are at it, add a real blower (KB twin screw) to the Cobra and add any blower you want to the LS-1. While the Cobra is belting out in the neighborhood of 750 rwhp the LS-1 will be spewing parts.
Internally stock Cobras are already in the low-mid 9's in just under a year of production. 7's are probably not that far away on the stock block.

ULTIMTEORANGESS

refer to my post.harlans TT firehawk dynoed at 584 RWHP on 100 octane.he drove it for 40k miles and the motor held up fine.totally stock motor.ls1s with lower CR have made much more rwhp on stock bottom end.

ill give another example.rod raymer recently dynoed a %100 stock ls1 with 85k on it @9 psi and it dynoed over 500 hp.i think this paticuliar car had a stall too.key is tuning.general statements saying ls1s with blow up under boost is incorrect.of course it has its limits but they can make power with stock internals.


even things out with a forged bottom end ls1 then compare peak potential.ls6s are no slouches with boost either.


most ls1 builders do prefer to make power running strokers with nitrous however.

Antz97ZNJ

03 Cobra... c4 tranny, bolt ons, and a small shot of nitrous 9.59@143 plus ..For a LS1 to run that it would need far more mods, and struggle to stay together like scott already stated

ULTIMTEORANGESS

struggle to stay together?does the ls1 running 8s struggling to stay together?as i keep saying and its been proven ls1s will hold up to a reasonable amount of boost if tuned properly.harlan ran a 10.0 with his stock internaled TT ls1 and he drove it everyday and it didnt blow up.


stop kidding yourself an ls1 is overmatched against this car.yes in STOCK form it is but thats where it ends.

scott9050

So this 8 second LS-1 had stock internals? The original argument was for just a blower to be added with bolt ons and not twin turbos. Modular Mustangs are already in the 7's, it will not take very long for the 03 Cobra to get there as well. Randy Haywod of True Blue performance ran a 7.99 on a 5.4 with stock Lincoln Navigator heads. Now how many LS1's run in the 7's? That's what I thought. Fact of the matter is that the fastest modulars are over a full second faster than the fastest LS-1's, and that's undisputable .

ULTIMTEORANGESS

did i say stock internals?i knew he meant that but thats not what he said.but yes theyll make almost as much power with a blower as a turbo on stock internals and itll hold up fine.


who said anything about a 5.4?and it wont take long until ls1s hit 7s too.ls1s will close the gap soon enough.itll most likely be a vette powered ls1 though.maybe not.fbodies are more popular to build.if you think ls1s arent capable of running similar ETs youre kidding yourself.lt1s used to be faster at one time.its called progress.

Capn Pete

How do you figure a 390 HP engine, with a few bolt-ons such as underdrive pullies is going to dyno close to 500 RWHP?! What other "bolt-ons" are going to add ~100HP?!?? Let's be generous and say that pullies will add 10 RWHP (although I'd say 10 fly-wheel HP is more realistic), if you figure that the factory rating of 390 HP is probably fly-wheel, where does 500 RWHP come from??? Maybe I haven't paid much attention to the Cobras, so maybe they're dynoing 400+ RWHP stock.........I dunno?

Now would an LS1 with 8 psi of boost plus a few bolt-ons not be putting well over 400 HP to the rear wheels? Maybe even close to 500 RWHP?

I guess I'm just thinking that if the Cobra and Z06 are supposed to be a good match for each other, a stock LS1 with a blower should be able to surpass either one..................maybe not though?

ULTIMTEORANGESS

adding a pulley to an 03 cobra is a different ballgame than on an ls1.hes referring to the blower pulley which ups the cars boost and itll add alot more than 10 hp.

97bowtie

He was talking abou blower pullies - not underdrive pullies.