Big Turkey

Car is my 04 Cobra.

After all the simple bolt ons and a very conservative tune, putting down 460hp, 490trq, the car went 11.77 @ 118mph on my old tune, I felt the car had more in it. So I slapped on a 2lb lower pulley (which was given to me for free by a friend who went KB) which should give me approximately 2psi of boost. We slapped the baby back on the dyno and retuned it.. this time with a AFR of 12:1 and timing at 22deg of advance.. it put down:

482hp, 528trq.

I took it to the track and let the engine cool down fully, iced down the blower, and ran a best of 11.54 @ 121.24, with a 1.75 60'. The launch wasn't all that great, it bogged just a little. That was the best of the night.

Well recently, about last week the same friend gave me another intake to try out. This particular intake took the filter and slapped it into the fender, along with the MAF so it doesn't mess up the readings. I was skeptical since I only was able to run a 9" filter, to my K&N 12". But it did replace the factory upper pipe. So I did it anyways.

Went to the dyno the next day, and came out with this:



The best part was that we didn't even retune the car. The only change was the intake.. and AFR's richened to 11.7:1 AND it picked up more power.

Mods are: Long tubes, catless X pipe, catback, upper/lower pulley and intake. Roughly $1900.

Went to a really crappy prepped track that was crowded and ran:

11.71 @ 122.74mph w/ crappy 1.96 60'

That was with no ice on the blower, and the car was fully warm by the time I did the burnout.

Here's the vid of the 11.51 @ 121mph pass:

(cobra vs Z28)

Just for you LS1 guys.. I got spanked by one at the track. Three times!

z98

Well, a stock bottom end LS1 went 9's, so I guess you could just spray a whole bunch and make that much power.

Realisticly, with a cam + spray + bolt ons (all budget ones) you could do 500+ without too much trouble.

Big Turkey

Yeah I know, I'm friends with the guy that went 9's on the stock end.

I thought a cam alone was around $2000?

WTB-a-Hawk

Cams go for around 3-400 I think. Then all the other parts such as retainers, rods, shouldn't be over 1g all together. If installed by yourself an Ls1 could get a nice cam and spray and a tune for under 2k, probably right at that, and be making well over 500hp. Or I could be dead wrong. Someone will chime in i'm sure.

BeefTip

Im sure you could get a used cam/springs on here for about 400-450. At some retainers and pushrods in for about 200 more. Get some lontubes 600-700. That combo can get you close to 400 rwhp and would be around 1200. With the remaining 700, you can get a good wet shot of nitrous. That should get you well over the 500 mark. That is all considering you do the work yourself and im sure the stock bottom end would only last so long.

Oops i forgot about the tune but oh well, close enough!

02BlueFormula

Well lets see I spent 400 for my used nitrous setup, then about 500 for the headers and y pipe also used but both are in great condition. Me and my friends ported and polished my maf and tb so that was free then spark plugs and wires another 100 dollars, lid for another 80 dollars and 30 dollars on my cutout. I had 422 rwhp and 487 on a 100 shot without the headers spark plugs or wires.I have not dynoed it yet but I am sure I am in the 500 horsepower range with over 550 pounds of torque for 1,110 dollars add the 300 dollar tune and it is 1,410 dollars.

ITSTOCK

iTrader: (1)

WOw, a LOT faster than you big turkey. For 1900 you aren't doing too great. I have a little LESS money (about 1800 invested, and that includes 60# injectors, mafxtender, etc.) and have by FAR better numbers than that. I am on the juice, but oh well. Where you spent money on longtubes, I spent it on a good nitrous set-up. I'm also on stock catback.

All the LS1 guys have to do is buy a nitrous set up, take a nice easy launch, and they have those numbers.

BeefTip

BTW, i dont want anyone to think im bashing on the new cobras because i would take one in a heartbeat. I sold my old lt1 z28 so i would love a ls1 or 03+ cobra, both are capable of increadible numbers. I would imagine that some a good fuel system and nitrous on a new cobra like 5.8ltr.. has would make INSANE power for the money, especially since the cobra engines are stout from the factory.

unit213

Power level is great, but track performance ain't so hot based on that power. I'm borderline calling on hitting 500rwhp without a ported blower. Dyno numbers are pretty shady sometimes. ET's and trap speeds are more indicative of actual power. Just for reference, I had a JLT CAI, a Bassani catback, 2.76 upper with idlers, and 315 Nittos and went 11.29 @ 123mph on a 1.85 60'. That was with about 460rwhp/480rwtq.

SmaknaSS

iTrader: (1)

No one mentioned an upgraded fuel pump on an LS1, I'm not shure a stock fuel pump on an LS1 could handle much more than 450 RWHP. But I could be wrong.

Roarin_8

iTrader: (5)

I've heard that if you shoot more than 125 shot you will need to upgrade the pump and injectors. Now the Tranny is a different story, I've heard 450RW then after that pray.

SmaknaSS

iTrader: (1)

I believe a stock LS1 with stock fuel pump and injectors could easly handle 125 shot or more, but with H/C or even cam and headers I would not push it.

x phantom x

iTrader: (14)

.
Haha, this should be funny.

Well here is some info from my personal car .... Big cam, headers, cutout, nitto's ($1400) .... 11.4 second quarter. Stock block, stock heads, stock rear, stock tranny, stock weight, stock options, w/ some nice heavy-*** aftermarket chrome rims. I think the best I have seen out of a similar setup was 10.8 .... and oh yeah, this is all N/A ... LS1's don't need blowers to go fast.

Then you can add in a nice nitrous shot (~$500) ... and the LS1 flys away from the turkey mobile.

Thanks.
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unit213

Gobble Gobble

5w20

iTrader: (21)

damn this turned into a 'big turkey' bashing.....lol

00GTBlown

If LS1's only need the mods you listed to go low 11's or high tens, why do many of their owners buy blowers? Some with S/C's don't run as fast as you do. There's a guy on LS1.com who has a Procharged heads/cam LS1 and he ran an 11.2 quarter. Ford's 4.6 engine is smaller but responds very well to forced induction, so a blower is the necessary choice for easy HP and torque.

As far as spraying for ~$500, yes it does the trick but you have to limit its use to minimize the expensive bottle refills.

x phantom x

iTrader: (14)

I'm lost as to what you are saying with this?

a) a cam is FARRRR more popular then a blower on an LS1 ... No clue what you're smoking, but there are relatively very few S/C'd LS1's, compared to cammed LS1's.

b) You can deny whatever you wish, but I HAVE those mods, and I HAVE gone 11.4 (on only my second and final run on that setup, I might add). There are plenty of LS1's that run in the 10's and 11's on Just nitrous .... $500 + $40 a refill = a ton of refills before you get to $1,900, so I don't think thats really a big concern.

I don't recall arguing that LS1's responded better to superchargers then 4.6's do? Actually, I would tend to argue the opposite, and I think for most people, a H/C setup or stroker would be a much better choice for the money then a S/C'er on an LS1.

Exactly .... N/A 4.6L < SC'd 4.6L .... hense my point, 4.6L needs a s/c'er to be fast, while still maintaining streetability. Pretty simple, which I'm sure is why Ferd just slapped a S/C'er on the cobra, instead of increasing displacement or something else.

Still, 480 somethin rwhp = 11.5 .... not exactly something I would register and post on an LS1 site, in an attempt to show us up, or whatever he was doing.

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Poik

11.4 is lightning fast for cam-only and stock weight and everything else. And if you only spend $500 on a nitrous system, you won't be getting a very good setup.

00GTBlown

Smoking? ..if you ever see me doing that you'll know something really bad is about to go down . There are numerous blown LS1's, regardless of the ratio to cammed ones. I guess those crazy few who bother with a blower instead of a cam just don't know any better . My bad for even mentioning it.

Let's not get defensive, I never denied your claim about how fast your car is. I was curious as to why most others don't get the same results. It was an honest inquiry - nothing negative intended. BTW, the cost and trouble of re-filling bottles can be a big concern for some, that's nothing new.

A+ answer.

Exactly.

Big Turkey

So if you would have cut a 1.6x short time then you're telling me you would have been knocking on 10's door and trapping what ported blowers + lower pullied Cobra's usually run and trap? What was your 1/8th? Maybe you got freak then. Broke's car went 11.18 @ 125mph on the ported blower setup, and we all know he can drive and he was putting down 520whp.

Just curious but did you ever back that run up? I'd like to see the timeslips for comparison's sake.

How much does your car weigh? Unlike alot of the Cobra owners I leave everything in my car at the track.. just like I drive it around in the street. It weighed 3974lbs with me in it, half a tank of gas. FWIW the car was hotlapped when it went 122.74 and I backed it up with a 122.24 after I went around again. Unit, you of all people should know the Cobra needs cooldown time to run good times. I know the car has a 124mph out of it. I'll get it this Sunday.

You have to remember that the Cobra has a blower along with an iron block up front.. so in result it weighs 3974 with me in it. You got a good 300lbs on me.. but that's why they make power while doing so little. Give me the weight of a LS1 and I'd be in the 10s no problem.

Haha, you guys need to chill out. It was a joke and I knew you LS1 guys would get all bent over me just posting dyno numbers. I'm about to add a shot to the car and see what it does.