higginsbeach

Hey Vadim,

Great Job documenting the gains based on your ECU DYNO tuning. So if I understand correctly, the ECU tune picked up 43hp (red to blue) when the cams came installed to you? Adam put the cams in with no ECU tune. Than Rocket lets you at it and now you have picked up 43HP. So, is this all from the tune or getting the CAMS to work properly with an ECU tune or a mixture of both? DOes this mean that anyone getting the CAMS is going to need an extensive ECU/DYNO tune to get them to work properly.

jangy

It isn't just the shorter gearing (if at all). It is the center of mass. The lip is a big part of the rim weight and you are moving it out, which in turn affects the TQ output (to the floor), which affects the HP.

I've said it all along. The differences are NOT small.

Havoc

To CAM, would be the Answer!

blackbenzz

So we need to send out cars to VRP to get ECU tune if we want to gain the power with the cams? You guys need to open up a east coast facility like NOW

E55 RUSS

Can I get my ECU flashed

blackbenzz

Send your car to Cali

E55 RUSS

May be I should drive it there

dyno

Yes, true.
indeed difference is only in weight: should you instal 20" "lighter" rims&tire, ie same weight as 18" have, there should be no difference.

btw, PLEASE, VADIM, if available post the CRANK POWER GRAPH too, that is certainly more sexy
I guess its slope be upward till limiter
.. unfortunately tranny losses increase more than proportionately

last: .. the gain obtained is from LONG HEADERS+ CAMS, right?

chiromikey

nope, reread what jangy is saying. even if two wheels are the same weight, the one with the weight further from the center will negatively affect hp. so 20" rims that weigh the same as 18" rims will not necessarily make "no difference".

dyno

I think that affects only torque momentum

ps: Michael, do you still have SLR cams installed? ... just wondering how many HP you could get after a similarly deep fine tuning ..

ciao

jangy

Correct. It makes a huge difference.

jangy

It is, but you have to remember that the dyno wheel is the resistance. as it pushes back on the drivetrain, the motor has to TQ the power to the "floor". It is just like using a different lengthed wrench to hold a steadily spinning wheel. You will wear out faster, etc. etc. The object on a dyno is to twist the wheel up to a particular speed over a specific timeframe. That basically is the definition of TQ.

dyno

I thought discussion is not about acceleration time, but power output.

should leverage be the issue, as you are saying, then please make Victor happy and install 16" rims to quickly achieve 700hp.

thanks for discussing
but must go ..bed.

jangy

I'm confused. How is the ability to accelerate not the same as power in this case? The dyno is not measuring actual power, it is measuring the power put down as a function of time. lets assume you are going to dyno at a set rpm, say 3000 revs/min. Again, go back to my analogy of using a wrench to turn the wheel. Do you think that keeping the wheels running at speed is easier with a short or long wrench? It is the same with the dyno.

I can't put 16s on my car, but if all Victor wanted was numbers, they would put my car in first and screw with the dyno. He wants 700 horses, assuming that all else is equal. All of these variables are exactly why I NEVER listen to a specific number. The dyno is simply a tool to track changes, IF you have set a reference point or at least have something to compare it to.

chiromikey

yes, i'm still running the slr cams and i've wondered the same thing myself. i know i have a good bit of hp still hidden in my ecu.

E55 RUSS

Definately...I am thinking to get this ECU once Vadim is finished with it...

dyno

what do you think Guys about pros and cons from lowering the compression ratio, as it is in SLR ?

.. higher output raises engine temp issues and maybe this causes earlier knocking sensors activation and therefore, retarding...

blackbenzz

Lowering c/r with head gasket or pistions? What do you have in mind?

Either way you will have less power with the same amount of boost. You would have to raise the boost to see any gains.

V12Godspeed

I think we were thinking of shaving the pistons one time to raise compression ratio instead and add a tune for C16 race gas, it was just a project to see how it would react. According to my tech the car would have made some crazy power.

ProjectC55

I think you mean shave the heads Jodster to raise the CPR!! Shaving the pistons would do the opposite (Lower CPR) unless he added longer piston rods while doing that.

V12Godspeed

Right, shave the heads, my bad.

ProjectC55

No probs! Too much Mangu y chicharon de pollo!! Este es mi plato favorito.



Shaving the heads and porting them will give you nice pwr though as long as the piston recesses for the valves allow it.
I'm surprised you're not going 55 again with all this nice stuff VRP's coming out with. The SW looks reliable and promising but we'll confirm that after we see some more cars from there run.

Ghostrider

Hey Vic, don't forget to show the MidWest some love!!!

Ghostrider

Where can we find pics of Rocket's 55 with the TA rims??

jangy

It was during a myMB meet at Brabus, so the pics should be in the events section of that site