kirjo Member 113 Member For: 17y 3m 23d Gender: Male Location: Brisbane Posted 27/02/10 01:08 PM Posted 27/02/10 01:08 PM I have a BA XR6 Turbo, 4 speed auto. Last year the valve springs were changed to Atomic, I installed a walbro fuel pump and K&N filter with F6CAI. The car was given a run on the dyno at BPS where the springs were installed and pulled 204RWKW. The other day, an F6 intercooler was installed and the car was given a run on the dyno before tuning and pulled about 162RWKW! After installing injectors and a 13Psi tune it made over 260RWKW. My question is, why such a difference in power between the two dyno runs when the car was stock? The only thing changed was the standard intercooler was swapped for an f6 one. Can someone shed some light on this? And also, the BPS graph appears to be smoother. I have no idea why.(the difference in result on the BPS dyno graph was due to the air box being disconnected)
Rhino1980 09JET Member 1,510 Member For: 17y 3m 19d Gender: Male Location: E. Maitland Posted 27/02/10 08:30 PM Posted 27/02/10 08:30 PM (edited) In the first graph the dyno is in Shoot 6 mode. In the second it is in Shoot 6F, which I'm pretty sure it needs to be in. I won't be going to BPS... Edited 27/02/10 08:31 PM by Rhino1980
Rootster Just a large member member Legacy Donating Member 3,125 Member For: 17y 11m 22d Gender: Male Location: sydney Posted 27/02/10 11:57 PM Posted 27/02/10 11:57 PM lol....I've always wondered about these dyno figures....Having people on here say they picked up 80kw but ran 1/10 slower....Should start a quest to find the tuner with the happiest dyno...I'm sure I know who would win...
BensXR6T Member 478 Member For: 17y 9m 2d Gender: Male Location: Burpengary QLD Posted 28/02/10 05:38 AM Posted 28/02/10 05:38 AM (edited) I think the RDP readout is more accurate, Lee doesn't try to fudge any figures by placing temp senors in more favourable places and makes sure the car stays down on BOTH rollers, etc. If the car crawls up onto the front rollers only, it can exaggerate the readout.Looks like a very similar graph to mine, what other mods have you got?This is my graph with 42lb Bosch Greens, Nizpro springs, OEM monza cooler with HDi cold side piping, 4" Mild steel Dump, 3.75" 100 cpi cat, twin Redback 2.5" exiting through 4x 2.5" tail pipes t 14psi. Lee and Pete said they'd of got 400HP easy if it weren't for the Cooler and Redback exhaust. Edited 28/02/10 05:39 AM by BensXR6T
Gee Member 131 Member For: 17y 5m 23d Gender: Male Location: Melbourne Posted 28/02/10 08:11 AM Posted 28/02/10 08:11 AM I laugh at dyno figures. I had a number of different tuners from small operations to big operations. Each tuner runs my car up on the dyno and it makes about 270 rwkw. Then they tune my car and is makes about about 300 rwkw to 340 rwkw. But when I run the car at calder park the tunes from the big operation which make closer to the 300 rwkw mark are faster and my 60 foot time are the same matter who tunes my car. Also the tunes from the big operations are smoother and are nicer to drive everyday.
BensXR6T Member 478 Member For: 17y 9m 2d Gender: Male Location: Burpengary QLD Posted 28/02/10 08:17 AM Posted 28/02/10 08:17 AM I agree with you Gee, everyone needs to remember that the dyno is only a tuning tool, if you want to accurately measure you HP, take it down the strip and do the maths.Here's a link to an online calculator Horsepower Calculator from 1/4 mile ET and Trap Speed - DragTimes.comCheers,Ben
kirjo Member 113 Member For: 17y 3m 23d Gender: Male Location: Brisbane Posted 28/02/10 10:48 AM Author Posted 28/02/10 10:48 AM (edited) Thanks for the comment guys. Mods are Bosch 42 pound injectors, walbro fuel pump, Atomic valve springs, F6 intercooler, F6 second air intake with K&N panel filter. Exhaust is stock. I think the RDP readout is more accurate, Lee doesn't try to fudge any figures by placing temp senors in more favourable places and makes sure the car stays down on BOTH rollers, etc. If the car crawls up onto the front rollers only, it can exaggerate the readout.I noticed that he never strapped the thing down at BPS. Would that have something to do with the 'exaggerated' figures? Edited 28/02/10 10:50 AM by kirjo
BensXR6T Member 478 Member For: 17y 9m 2d Gender: Male Location: Burpengary QLD Posted 28/02/10 11:18 AM Posted 28/02/10 11:18 AM If the car creeps up onto the front rollers, the resistance reduces making it easier to turn the dyno, which in turn will give a higher reading, so technically yes...
SPIKO Legacy Donating Member 1,924 Member For: 21y 6m 1d Gender: Male Posted 28/02/10 11:26 AM Posted 28/02/10 11:26 AM (edited) Ben, It is not that simple buddy, You have a point however as your power increases the capability of strapping down decreases... This is not conclusive my friend. Does anyone know what the load rating on a 1900kg car is at between 130kph & 210kph? Does in not vary? What if there is a 30kph headwind? So iff you strap it down harder is the result accurate?The tool is not meant to measure this LOL.. It has limitations on the amount of torque and power it can measure accurately...... Edited 28/02/10 11:40 AM by SPIKO
kirjo Member 113 Member For: 17y 3m 23d Gender: Male Location: Brisbane Posted 28/02/10 11:45 AM Author Posted 28/02/10 11:45 AM But surely leaving a car unsecured will increase the probability of giving a incorrect result?
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