edk thats pants no?!
PE Rolling Road Figures 31st Oct 2009
- Thread starter edk
- Start date
Nope, as I said I'm indifferent about my results. At first I was like wtf but me and stu worked it out and it seems to be a true figure. Exaplains the difference in mine and Eddie's 1/4 times and between me and Stu on the drag strip too. End of the day as I said I'm much more interested in how and car is driving and thus the shape of the graph and how it compares to a previous dyno dynamics print out 
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.i would be screwing, but thats me. remap needed then ed, what whp/bhp do you hope for then?
I'm trying not to hope for a power figure, as I'm in this to see what's possible out of the YD22. By taking boost pressure up to 1.7 maybe 1.8 bar and with the hybrid turbo it'll be a significant increase. What I don't know though are the limits of the injectors and/or pump. If they hold me back then I'll have to to look into whether I can take them off of a Navara YD25, but I don't see why that wouldnt work. If the injectors don't fit however then I'd say use a YD25 head on the YD22 block.
And also to mention RR's and power figures in general. You can drive a car to 3 different RR's in the same day and see 3 very different figures, it's all down to the RR / dyno setup.
Naturally we all want to see a big figure cos it makes us happy LOL but all you really want to be looking at from a RR day are the fuel and air graphs, as these will indicate where there may be problems. The only true way to validate an engines power out is on a bench, not attached to a car.
The best advice is always to go to the same RR and that way you'll be able to monitor power increases or decreases accurately enough.
All RR setups use different equations to calculate WHP > BHP and also the percentage losses.
Then you have tyre pressures on the day and so on.. It all adds up differently.
Naturally we all want to see a big figure cos it makes us happy LOL but all you really want to be looking at from a RR day are the fuel and air graphs, as these will indicate where there may be problems. The only true way to validate an engines power out is on a bench, not attached to a car.
The best advice is always to go to the same RR and that way you'll be able to monitor power increases or decreases accurately enough.
All RR setups use different equations to calculate WHP > BHP and also the percentage losses.
Then you have tyre pressures on the day and so on.. It all adds up differently.
Another thing that's interesting is where peak torque and power come in. In SHOOT_4 mode torque came in a good 500-1000rpm sooner. Again this is down to the roller resistance setting. Engines perform different under different loads, so one engine might look more powerfull on that load setting but another may perform better under another. The resistance is obviously there to mimic the weight of the car. If there was a calculation that could apply the correct resistance based on the known weight of the car then that would make it even more acurate and true to real driving condidtions.
Renrut (NPOC) with a P12 DCi had his on the rollers a good while ago and was surprised at the lack of power and how low torque was on the graph and how late it came in compared to what he thought it was in reality when driving the car. He used a Dyno Race at Chipped UK so there's no way to compare for example the SHOOT mode and with a different dyno calculations willl be different. But there's a good chance the Dyno Race machine wasnt giving acurate resitance on the rollers that represented real driving.
Renrut (NPOC) with a P12 DCi had his on the rollers a good while ago and was surprised at the lack of power and how low torque was on the graph and how late it came in compared to what he thought it was in reality when driving the car. He used a Dyno Race at Chipped UK so there's no way to compare for example the SHOOT mode and with a different dyno calculations willl be different. But there's a good chance the Dyno Race machine wasnt giving acurate resitance on the rollers that represented real driving.
Dynapack's own it seems - http://www.dynapack.com/index.php?o...4&phpMyAdmin=00949cc73f37c53ee209590c5645f171
It might be then mine and JOES in particular the incorrect shoot mode was selcected due to our levels of strippage/weight reduction or simply weight of the car overall?
My 2nd run the opperator got 108.4bhp dont know why he didnt get that figure again or higher even
My 2nd run the opperator got 108.4bhp dont know why he didnt get that figure again or higher even
They just dont take into account the weight of the car and how it affect real world performance of the engine. So I dont think it was the wrong SHOOT setting persay. But yeah they could do with introducing the weight/resistance variable as I said to help make it more acurate.
Yeah I would say so Paul . Just putting in my pearls of wisdom to the dyno makers out there 
:lol:.
Oh forgot to mention. based on comparing graphs (which as I say is the only other useful thing you can get out of them apart from shape and AFR), if you take Sexypink's 127hp and take my 131hp that's a 4hp difference. Now lets say everything is even and Sexypink's being standard would be putting out 136hp. That would make mine 140hp (which is exactly what I was hoping for after the mods I've done, after a previous 138hp dyno. Remember I'm fighting against a standard map so not going to see huge gains yet!).
Ok my calculations were off there. To get to 136hp you need to times Sexypink's 127hp by 107.1%. Based on that it takes my comparative hp to 140.5hp, and 219.5 lb/ft.
So I guess on a more forgiving/less acurate(?) dyno that's what I would see.
. Just putting in my pearls of wisdom to the dyno makers out there :lol:.Oh forgot to mention. based on comparing graphs (which as I say is the only other useful thing you can get out of them apart from shape and AFR), if you take Sexypink's 127hp and take my 131hp that's a 4hp difference. Now lets say everything is even and Sexypink's being standard would be putting out 136hp. That would make mine 140hp
(which is exactly what I was hoping for after the mods I've done, after a previous 138hp dyno. Remember I'm fighting against a standard map so not going to see huge gains yet!).Ok my calculations were off there. To get to 136hp you need to times Sexypink's 127hp by 107.1%. Based on that it takes my comparative hp to 140.5hp, and 219.5 lb/ft.
So I guess on a more forgiving/less acurate(?) dyno that's what I would see.
^ Ed you talk rubbish sometimes
if’ your peak power on the dyno from PE was incorrect IF. Then the shape of the graph is wrong also, as power @ 2k or 3k or wherever isn’t correct either. So with your tracing paper you’re not going to be able to start comparing anything with real accuracy. Only the dips and spikes and that’s it, however when they occur will be off also. The power/torque throughout the rev range isn’t accurate and the last 500rpm be off, its all off. just comparing 2 wrong graphs really, whats the point in that.
totally not having a go, however when folks pay for something and there doubt - it winds me up.
if’ your peak power on the dyno from PE was incorrect IF. Then the shape of the graph is wrong also, as power @ 2k or 3k or wherever isn’t correct either. So with your tracing paper you’re not going to be able to start comparing anything with real accuracy. Only the dips and spikes and that’s it, however when they occur will be off also. The power/torque throughout the rev range isn’t accurate and the last 500rpm be off, its all off. just comparing 2 wrong graphs really, whats the point in that.
totally not having a go, however when folks pay for something and there doubt - it winds me up.
:lol:^ gwan lad lol
No indeed. A resistance is put onto it from what the guy was saying though, and if dyno dynamics could control that resistance to represent the weight of the car i.e. intertia created/the pull against gravity which is a force against the engine then it would produce readings more true to the way the car performs on the road.