Let's see what everyone believes will be the outcome....
Why would somone lie about the before dyno graph, I just dont understand. The dyno could say his car put down 450whp and I wouldnt care. The only thing that is important is the gain between the before and after to me.
TOTALLY AGREE! However the before claim of 363 is what has us all up in arms. We need/want to see the very same dyno used to baseline a stock standard normal 355. This is the only way we'll get to see what sort of an improvement this chip that came with the car can make. Assuming also the new exhaust gives an increase of 20 RWHP. When measured on a dyno that is VERY optimistic that 20HP claim is also inflated, although the effect is obviously less. It is worth noting that the dynojet charts available on this site for 355s are all remarkably consistent depsite being in 3 different continents. So although it is not possible to compare one dyno result to another dyno's result, the consistency is reassuring. This is why the original claim of 363 is so startling, and why we want to determine if it is true. To put it another way, how does this car compare to ours? If we were to dyno our cars on your dyno and also get 363, then all this fuss would disappear, and we'd just put it down to an optimistic dyno. On the other hand if we got the same numbers as we have on the dynojet, we'd be forming a line right now outside your shop with check books in hand.....
Different dyno's, different atmospheric conditions yield different results. The 363 HP figure is a baseline, other 355's would probably be close to that figure on the Harmony dyno. My guess is that Chaa's 328 HP would be in the vicinity of 355nut's 363 HP if he were to use the Harmony dyno. A good benchmark would be to put another Tubied / decatted or Hyperflowed 355 on the Harmony dyno and see what it puts down. This would clear up this thread and would show how much the European challenge ECU adds. For now, all we will be able to determine is what the net gain will be from the installation of new Harmony headers and crossover pipe.
Which is in the right ball park though. 360s are only 10bhp more than 355s anyways. It has been posted on here that the 360 has been dynoed at around 315-325ish. So the Harmony Dyno may be at the right sea level after all LOL!!
I have a bone stock F355 coming in for a 30k service in 2 weeks, you can count on that car going on the dyno.
my 355ch has 323rwhp on a dynodynamics dyno. no cats. challenge exhaust. motec....mixture/timing played with for max hp. engine in perfect condition. obviously there will be SOME difference from dyno to dyno....but....can a manifold make 40hp difference.......at the wheels?? i have no idea. i voted the dyno is stuffed, though.
I support the use of a baseline car different from 355nut's. We are already poisoned so we need to toss it out and get a new starting point. Now, if u could mod that car up and see the return, you'd have something. On another note, I would really hate to think that there are 355's out there with 10-20% output differences for the same model years. Harmonyguy, u need to understand that this entire group wants to believe that u can deliver significant gains, but if the data is stinky, then the results are, well, stinky too. I get the feeling that there is going to be some serious $$ involved (going from a stock set up is at least $5K for hypers and exhaust plus whatever else u prescribe), so going the extra mile for documentation is gonna pay off, but not doing it is gonna crash ur project. Good luck - and I mean it sincerely.
You had this sheet since august??? Dude, you could have saved everyone here alot of circle jerking!!! Now for the analysis of the chart: 1. The lines look almost hand drawn . 2. You didn't shoot a video??? That is monumental RWHP! 3. At 7000ish RPM???? No way! 4. The bottom of the chart says "eng. power" does that mean @ the flywheel......WTF?? So post up guys, is this for real???
Oh dear, i feel a little disapointed It feels like i have been looking forward to going out at the weekend, but only to wake up next to an ugly girl What is that scan about??? What car is that for??? Why is there no car id??? You will see on my sheet it clearly ids the car as a ferrari 355. I am not expecting the same kind of sheet as my own, but how does any one know what car its for? Becourse i could get a dyno read out sheet of my mates 655RWP car and show it on here and say it was mine If the new dyno read out looks as bad, dodgy and as suspect as that then we might as well close these threads now. Personaly i think that said dyno sheet has been bodged together.....IMO of course Image Unavailable, Please Login Image Unavailable, Please Login
After looking at that chart that 363hp number HAS to be corrected for "flywheel" HP. It is getting that 363 @ 7000 rpm there is no way that is RWHP! NOT with hyper-flow cats and a tubi!!
What is interesting is that the 2 curves - chaa's and 355's - are very similar from 4000 up. chaa's goes a bit longer so we see the fall off. What is curious is the lower part of the curve where chaa's makes little torque at lower rpms while 355's has a higher curve. That needs some 'splainin', Lucy. Both show a torque fall off at around 5300 rpm; I wonder why. This tells me that 355's sort of tracks a normal 355 pattern. The gradient differences can be explained by indexing, weather/climate and equipment. For me, I would tend to believe the curve pattern, but not the output values so I want to see another car dynoed on this machine. Then we compare it to 355's and see what we can see. Still, the value for 355's car is just a number, not necessarily a real indication of on-the-pavement Hp. For that, we need to get his car on the track with an accelerometer and test it against another, unmodded, car. Then we can calculate observed Hp and correlate it with the dyno results. Man, don't let me design a paperclip - u might end up with a $1000 paper fastening device.
I don't know about the Mustang dyno, but one I had my bike dyno'ed on years ago gave you the option of entering in a conversion factor to get crank from wheel hp. YOU COULD ENTER ANY % LOSS YOU WANTED! The greater the % loss, the greater the crank hp. The graph and so forth would then print out nicely with the supposed crank hp displayed. The software DID print the conversion factor on the chart for reference. Assuming that this chart was calculate with a loss of 15% - a number often used, although 18 get's thrown around too for 348s and 355s - then that comes back to 308 RWHP. Now that is right in the ballpark of a "normal" 355. ECU changes without accompanying breathing improvments are not likely to do much, so to me, this seems the most likely explanation. Anyone else here ever used a Mustang dyno and can tell us whether a % loss can be included in the output charts???
