Yes, flywheel but still odd value in bmep calculations. Head is still designed in runner size to maximize torque at some 2500-3500 level and for sure it will cut bmep at 5900 much lower. At that 2500 these engines manage to do over 13 bmep values but stock head and 5900, this should hit values less than 12 even with open exhaust and very small exhaust back pressure, notice that pte6870 is way over it's peak effiency at those levels so it will push charge air temp up too.That's factoring in the results being flywheel hp, not whp?
I should not do this but.... some bmep calculations shows that there is something odd in that dyno sheet.
These engines on stock head with torque max at 5900rpm should have bmep value in a level of prox 12 plus charge air increases what in this case should be 12x3.4(abs at 35psi)x1.07(effect of e85 cooling) minus some degree charge air temp rise and ignition advance pulls on that boost levels.
Calculator shows bmep with e85 should be at best possible ideal situation in a level of 40-42. Now that dyno show values over 51.5
Is there any explanations to this? 200-250hp nitrous shot could explain it.
Just qurious and waiting to see some logs of this.
Yes, flywheel but still odd value in bmep calculations. Head is still designed in runner size to maximize torque at some 2500-3500 level and for sure it will cut bmep at 5900 much lower. At that 2500 these engines manage to do over 13 bmep values but stock head and 5900, this should hit values less than 12 even with open exhaust and very small exhaust back pressure, notice that pte6870 is way over it's peak effiency at those levels so it will push charge air temp up too.
This hit now value of 15.1 calculated as a atm what is in a terroritory of a F1 engine and that is freakin high.
What is lifting bmep is
- high compressin ratio, not in this case
- short stroke, big piston what equal to big valves, not in this case
- stupidly well flowing head, not in this case
- intake manifold runner size matched for rpm this level, yes in this case
- very low exhaust back pressure, not in this case even with big turbine housing
Stock engine at these 5900rpm ratios has 15.1 bmep with boost 0.5bar so as atm that will produce only bmep of 10 at those rpm's
So calculations with 12 throw it with 35psi to value of that same 40 area what ever you do, not in those insanne 51.5.
That's why it could be interested to see logs of this run.
And as a reference, my 135 runned with stock head over 172mph 1/2 miles at close to 30psi .. with 630 at the wheel so this should be in a 670-700 true whp level at the wheel with that 178.
That bmep calculation give very rough runs to many dynoruns, cause of that it's narrow line where every single engine should hit on and it just calculate volumetric effiency.
Remember that on last 50 years, ve and therefore bmep has been improved by only some 15-20%, with all gizmos there has been throwed to development of combustion engines... multivalves.. vanos.. valvetronic.. electronic.. injection.. intake design.. controlled burn process, you name it.. i think of that improvement is due much more precise electronic control and other half is improved cylinder fill by mechanical things.
So at mechanical side we have done improvement from 12 to 13.5 in average bmep in last 50 years
Who built your motor that your having missfire issues ?I just told that i could be interested on the technic how to archieve this over 51 bmep with the specs what was on the sheet.
Bmep value as i told is a upper limit where you can reach with different combinations and it's very easy to do calculations about where you are in point of view as mathematic calculations.
As stock engine, 3 liter, 400nm, 5900rpm, 0.5bar boost equal to prox 15as bmep.
That bmep is following
Most restrictions on that engine in that level is cylinder head and exhaust manifold with turbine housings.
Take that housing restriction away with much bigger turbo and you are in level of 11 on those rpm ratings as atmo or so, propably maximum what can be archieved with all possible vanos tweaks etc is as atmo at the level of 11.5 and level of 38-39 with 35psi of boost and little more with e85, maybe 41-42 at the extreme end.
Not to go to any ad hominem behaving, just explain how to archieve levels over 51.5 with stock head at rpm ratings way over stock engine max hp rpm level.
Very easy way to get idea of bmep and how easy it is to push it to those levels.
About those performance levels, i archieved with my 135i 276kph 1/2mile with 630whp and 312kph standing mile at power level of 590whp so what of that is not doable? That level of performance throw my car to 10.4/218kph at rev limiter.
And yes, stock internal unopened engine, now i have fully built one and have struggle with misfires.
1/8 trap speed with this combo is over 180kph and that is with prox 700whp.
All of those is arcieved on airport runway without traction additives
So, pleace, read my reply, do some research about bmep calculations and don't start with any ad hominems.
Yeah just hold the WR in a half mile nothing groundbreaking@135boost
You're (most) overlooked the part about this being a crank number. But remember the car was on a chassis dyno. So it's whatever conversion they are fudging that's the problem here. It's pretty obvious there is a 'hey look at me' factor here that is made up.
The car is quick. No argument there. But it's nothing groundbreaking.
Sorry but i do not see a 1000whp car there. The car is lazy and not even try to push at all. Let me show u a 3deg/10afrs/0 trims base tune on a 6870 too 4th gear pull correctly calibrated. Let see the difference. What do u think is making more power.. hmm 748ish whp just a test on a base tune. AT tranny
I could see a 5th gear calibration and ran 4th gear or some like that where if i do the same like many lately. They make 1000s. If i do that i may end up in the 1200whp.
Btw i will do 1200s. But i will show gear and calibration and logs and graph right at everyone. The only thing secret on a log is the misleading titles of the posts. Bcz u can see gear.. bcz u can see that a car is not making the power claims..
I agree! after being in couple other communities over the years I'v noticed that BMW guys criticize a lot more than they encourage and support!lol.
Scorpo builds a car thats does well in his chosen event and gets a few records along the way. He posts a dyno and everyones doing high level physics to prove its not a real dyno number.
As if he gives a shit or anyone that races actually cares about a dyno number.
Best build Ive seen in a while good stuff Scorpo.