e500slr

What's the maximum HP anyone has gotten on their 55, without nitrous and WHP not crank. I'm just trying to see if anyone has gotten ~700whp without NOS.

urbamworm

Pretty sure not even 600whp has been hit, believe around 580whp is the highest and that was on race gas.

AMGPilot

Not gonna happen

urbamworm

Unless you turbo it

e500slr

Why is that though, there are SLRs which have hit 750 crank HP, how I know the differences in the engine but the block is the same, I mean blown Cobras make more, are you telling me a Ford engine can make more power than a Mercedes engine

urbamworm

Different cams and higher flowing heads are 2 things that could help. As for a Cobra, they have options for larger superchargers and also run more boost as well if you are talking about ones making numbers like your 700whp.

AMGPilot

there is more to it than that with the SLR, Cams, heads, INTERCOOLERS, Throttle bodies, cranks, forged pistons, exhaust to name a few. Don't forget we have cast pistons in the E55...

700WHP is 840+/- Crank

Blown cobra engines are cheap compared to AMG motors. If you want 700WHP is would be far cheaper to get a crate LS motor and trans and go from there

GT-ER

First, 750 crank hp is NOT 700whp. It's more like 600-650whp. And you stated you wanted to talk about whp so let's try to stick with whp.

Second, as mentioned before, the SLR engine is considerably different from the E55 engine. Everything is pretty much swapable, but it's different non the less.

Third, our superchargers are pretty darn efficient for their size...but we are limited to just that. The owner of a Cobra will have the option of installing a Whipple supercharger and getting 700+whp out of it, but he won't do it with the stock SC ( At least I've never seen one get close to 700whp with it and without nos ).

Forth, I absolutely love this car...and some day when I finish messing with my new house and have nothing better to do I'll take the next step and remove the engine from my car and rebuild it with ported heads and everything and try to shoot for 600whp on boost only and pump gas. Or I can just turbocharge it and get 700whp. But I'm talking isht right now because it ain't going to happen anytime soon. Maybe in a year or so.

skratch77

As already mentioned the slr has a bigger supercharger along with top mounts to cool the charged air.

We are limited to 560-590 whp max with our blowers and that is a dyno glory run with a cold blower and ice sitting on it.

Its not the engine that is holding us back,its the limited amount of boost we can run.

Those cobras are not doing 700whp with stock blower

AMGPilot

To make more HP on our cars we really need two things a supercharger with more displacement than the 1.8L supercharger we have and a MUCH more efficient intercooler, that and forged pistons.

As for porting the heads, well there's not that much to be gained there. The ports are short, very short and porting is more important in a Naturally aspirated car.

GT-ER

1.8L? I could I sworn I saw somewhere they were 2.2L. Hmmm...they are even smaller than I thought. I could agree with the heads though, but it's something to do when going all out.

Ali_E55

it is in mercedes-amg website. they are to be exact 1.850L

i wish if there was an option for a bigger S/C.


anyways. i sold mine. and it is gone.

highst HP i saw on dyno was 527rwhp @ 34C temp.

stock E55 on same dyno shows about 370 - 385 wrwhp

GT-ER

Man, where do you guys get this info? LOL...I've looked everywhere for the exact specs of everything in this engine with little luck. So the charger is 1.85L ( 1.9 to round it off )? I even looked at the AMG website and found nothing. Good to know though.

Ali_E55

http://www.mercedes-amg.com/#/5-5l-v8-kompressor

here is the link.

2nd paragraph on the left, next to the engine picture. you will also see that S/C rotates at 23000RPM when engine speed is at 6500RPM.

stevebez

The S/C is a Lysholm Type 2300R 2.3L unit.

The 1.8L is used on the C32

The article talks about the air flow generated "...1850kg of air pumped per hour..." not the S/C capacity.

SLR motor is pretty much better at every critical point than our motors...

Massive H/E, split system.
Dry sump
Dual Fuel pumps
Better injectors
Closed loop fuel rail with dual FPR's
Forged pistons
Better cam
Better engine management systems (think its runs two ECU's)
Much better intercoolers
Better exhaust

It also has the same S/C as ours except with faster gearing allowing a smaller pulley - which looks to be the same size as our OEM unit. Think its geared for 1bar boost where we run 0.8 stock. A 180mm puts us in same ball park.

Not sure about the heads, conrods or the crank....

About the only thing the same is the block and even then that may not be exactly right.

whats surprising is how close we get to it frankly.

chawkins2001

Only option for those power levels are twin snails. If there was a bigger blower option, that would make it more likely but you would have to start upgrading other components first to prevent catastrophic failure.

e500slr

Well the car is fast even at 590whp, the fact that it weighs as much as it does and has run 10s boost only is crazy, I've seen R34 GT-Rs running ~700whp and struggling to get 10s. I think the torque is the weapon of this car more than HP, with the 5 spd tranny they make a killer combo. However I still thought someone would have started running forged pistons, SLR cams etc. What about the VRP700? How much does that car make, that car is just insane in terms of acceleration.

Hammer Down

Depending on your definition of fast?? you don't need a ton of hp in these cars to go quick or fast

Nino S

To reach 600 rwhp on a stock blower is going to be damn near impossible. A cobra will reach 700 rwhp with a Kenne Bell or Whipple but not even close with the stock eaton. My stock ported eaton maxed out on race gas right around ~550 rwhp. With a big 2.6H KB on pump gas makes 620 rwhp and with a smaller pulley on the blower and race gas makes 710 rwhp. I have run my rave tune a total of 3 times over 3 years on the street, the car is just stupid. With 315 Mickey Tompson drag radials on my PUMP tune will smoke them through the top of third. I have done almost every suspension mod trying to get it to hook but once you reach a certain power level it just kills tires. The other thing is that the rest of the car has to be set up to handle 700 rwhp. I have blown up 2 rears, 3 half shafts, and 3 T56 6 speed transmissions. You will just keep finiding the next weakest link and it gets really old and expensive very quickly. Unless you just want to have a dyno queen and be able to say you make xxx rwhp just get the car to 500-550 rwhp and be done with it. I have bought my Cobra all over again with just mods and fixing broke parts!!

Nino S

+1

I have seen 650 rwhp Cobra's lose to 525 rwhp Cobras just because of traction alone. You spin through 1st and 2nd and the lower HP car puts the power to the ground, you lost in the 1/4! You can make all the power in the world but if you cant get it to hook it is useless.

jwoodcl55

Is the engine used in the "terminator" 03 cobra the same as the ford lightning?

e500slr

Well said. Weight doesn't seem to hurt the car's straight line speed, I mean how much faster will it be with a significant weight loss if the weight does hurt it. I mean weight can't be good, it's physics, the more mass there is the more effort to move that mass. I still think at the very least 600whp is attainable without NOS, what's the VRP700s WHP?

Nino S

NO. The cobra is a freak of nature stock motor, forged crank, pistons, manley rods, just a beast. My good friend makes 980 rwhp through his 76 mm Hellion Turbo system on a bone stock motor in his 04 Cobra. The Cobra is a 4.6 32v motor and the lightning is a 5.4 2 valve non forged motor. Both are good motors but the Cobra has a much greater advantage. I have seen many single/twin turbo stock cobras well over 900 rwhp and a coulple over 1000 rwhp.

GT-ER

That's not the displacement of the blower. And now stevebez says it's a 2.3L supercharger...lol.

stevebez

weight / traction vs power / weight balance ....