I'd love to know where these are tuned and what dyno's are producing these numbers
Happy birthday chap!
x2, no way in hell that car in video is 220whp. It looks more like 180-190whp at the most.
So now lets look at some 'm4d tizzle' cams, proper gnarly race spec stuff. They can feed your stock B18C to 11000rpm, but have dropped your DCR to the low 9s. Your midrange will SUCK with this setup. So then, the usual reccomended solution is to go and drop in some 13+ CR pistons to return to the stock engines mid 10 DCR. In theory this is great, we have enough flow for 11k, and a stock DCR, so it'll drive around town like a factory car and tear chunks out of ex BTCC cars on track.
Except as far as I can see, it won't...
Can anyone tell what flaw I am looking at here?
So you want to know how CR effects the overall powerband of the engine ?
I know, or at least I have an idea. The aim was to provoke some thought, get people thinking about why they are bolting certain parts together in a build, and how they are all interacting, and why certain combinations might not work as intended.
Doesn't seem anyone is really bothered though.
I am not anyone, but I am someone who is not bothered by it because I do the necessary research prior to putting parts into a build.
But yet you are still puzzling over that flat spot and why you are struggling to meet your WHP goals...
I jest of course. I just thought some people might be interested. I'll go back to my cave now.
I am really interested so don't go into your hole yet lol. I'm on the move at the moment and am using my phone as the net so you'll have to wait untill i get home or get chance to sit down. Keep a strong head, its a very interesting thread .
kozy you know i don't have the knowledge of half the people in this thread. but do you mean. why do people go for mad cam's that are made for high RPM power but then try to make them work hard at mid range so that their car's have a more broad power band and remain a road daily drive / race car.. i've probably got the wrong end of the stick but thats what i thought you meant.
i like how you don't accept theory you go at it head on and challenge it.. kick it in the face lol .. Good stuff old chap..
http://www.ek9.org/forum/resource-a...-specs-comparison-honda-b-series-engines.html this is an excellent read, that explains a lot, and shows that it`s not black and white when it comes to camshafts.Increasing the degrees of overlap tends to move the powerband up the RPM range. Increasing the overlap can increase peak power, but only if the exhaust system is properly designed and sized to scavenge the cylinder. Decreasing the overlap tends to improve lower rpm range performance.
Right now, I'm looking at numerous builds, all high compression, that don't make the power expected, and then others on fairly mild compression that make more power than people think they probably should.
Turbos are a different matter though, there are no limits apart from the depth of your pockets, just make it strong and wind up the boost! OK, it's not that simple I know, but still, it's a different kettle of cod.
NASP is a slightly different matter, there are limits, and it is an art form reaching them. To deny this is IMO slightly niave, how do you think Honda manged to hit 100bhp/litre all those years ago? Trial and error with a big parts bin and hundreds of dyno runs? Hmmm...
I didn't take your comment as negative, I was just slightly underwhelmed with the lack of interest that's all. Seems far too many people coming into the scene now who just want to be told what parts they need to hit 200bhp, and who to take the car to to have to them fitted and tuned.
Seems far too many people coming into the scene now who just want to be told what parts they need to hit 200bhp, and who to take the car to to have to them fitted and tuned.
That's the thing, even if I spend a few weeks researching and calculating stuff only to find that what everyone is already doing is the best solution, then I am happy that I figured that out for myself and that my theory is probably correct.
If I come up with a different answer, like what I am getting with this cam/compression theory, then it irritates me because I feel it is then something I need to test, and want to test, but lack the resouces to do so! While it irritates me, it is also immensely interesting because I dig further than anyone ever would in search of an answer that nobody probably even cares about, and learn some interesting stuff on the way.
Right now, I'm looking at numerous builds, all high compression, that don't make the power expected, and then others on fairly mild compression that make more power than people think they probably should.