geea Site protagonist Lifetime Members 4,320 Member For: 21y 8m 26d Gender: Male Location: At the lights, waiting for you. Posted 10/02/06 12:03 PM Share Posted 10/02/06 12:03 PM I have been going through my collection of various dyno reading I have, both mine and other peoples from a large collection of dynos. In the past we have all talked of various methods that could be used to give false readings, I may have found another. Along the bottom of the graph there is usually kmph or rpm and some have both. I have 3 graphs from the one dyno all for XR6T's. Now I'm aware that autos should be run up in 3rd and manuals in 4th as this is the direct drive ratio. I'd assume this means 1:1. This being the case shouldn't both have similar comparisons of rpm/kmph?Here are the 3 sets of figures:the top is kmph and the bottom rpm..30.....50....70.....90...110...130..150...170...1901000.1670.2330.3000.3670.4330.5000.5670.6330this is 3rd gear in a 4 speed auto mid 2004..40.....60....80....100..120...140..160...180...1230.1850.2470.3090.3700.4320.4940.5560.This is also 3rd gear, I'd assume an auto in mid 2003...30.....50...70....90....110...130...150...170..190.900.1570.2100.2700.3300.3900.4500.5110.5710This is in 4th in a 6 spd man early 2005.Is anyone able to explain why the 3 sets of numbers would be different? I can understand why auto and manual could be different but why would 2 auto's? I suppose the middle could be a manual in 3rd is this possible? Would size of wheels make this much difference? I'm not going to say where the dyno graphs are from as I dont want to start a sh*t fight if it's all innocent. Once it has been established either way, why this is so I will state the dyno operator.Geea. Link to comment Share on other sites More sharing options...
F6 UTE - Track Bound EVO III - Member 3,367 Member For: 20y 1m 23d Gender: Male Location: Strapped in and holding on Posted 10/02/06 12:08 PM Share Posted 10/02/06 12:08 PM Isn't it the operator whom sets the bottom parramaeters and side aswell??They can do whatever they want, and adjust there scale to make the graph look better/worse..If it's a wonky graph with peaks and troughs, they spread it out and make it look better than it is??Are you alluding to the fact it's the same car, with the same mods, or the fact that purely the numbers are different??I have two graphs with kph down the bottom and both are different aswell.. Different dynos though. Link to comment Share on other sites More sharing options...
Dannopower Donating Members 421 Member For: 19y 8m 1d Gender: Male Location: Canberra ACT Posted 10/02/06 12:09 PM Share Posted 10/02/06 12:09 PM Wheels, diff gears maybe? If theres any wheelspin on the dyno too?? Link to comment Share on other sites More sharing options...
geea Site protagonist Lifetime Members 4,320 Member For: 21y 8m 26d Gender: Male Location: At the lights, waiting for you. Posted 10/02/06 12:10 PM Author Share Posted 10/02/06 12:10 PM All 3 are different cars on the same dyno. Geea. Link to comment Share on other sites More sharing options...
G6ET8U Playing with Sports Bikes... Silver Donating Members 1,927 Member For: 19y 3m 9d Gender: Male Location: Whistling, GTX. Posted 10/02/06 12:10 PM Share Posted 10/02/06 12:10 PM Hey Craig...Just a question to add to your question above...I have 20" wheels and the speedo is now out about 4-5kp/h... would this also effect the dyno readout?I (with all of my zero knowledge on the subject) would think so... or does a dyno only read ACTUAL speed vs ACTUAL rpm? With no practical knowledge of individual gearing or wheel sizes?Is this why a dyno is only a tuning tool and not an ACTUAL be all and end all debate ender?Sorry to hijack if I have but I am interested...Jack Link to comment Share on other sites More sharing options...
markxr6t Member 476 Member For: 20y 3m 9d Location: Perth WA Posted 10/02/06 01:20 PM Share Posted 10/02/06 01:20 PM I think there's more to it than 4th in a manual is 1:1 and 3rd in an auto is 1: 1. One to One is a generic and loosely used term.A quick look at some Wheels mags shows:BA Mk1 5spd Manual XR6T in 4th gear @ 6000rpm = 203 km/hrBA Mk 2 6 spd Manual Xr6T in 4th gear @6000rpm = 187.2 km/hrBa Mk 2 6 spd Manual Xr6T in 5th gear @6000rpm = 234 km/hrBA Typhoon 6spd Manual in 4th Gear @6000rpm = 191 km/hrBA Typhhon 6spd Manual in 5th gear @ 6000 rpm = 238km /hrBF Typhoon 6spd auto in 4th @6000rpm = 238km/hrCouldn't find data for 4 speed autos.I think gear ratios, diff ratios and tyres all add their little discrepancies to the final drive. Turbo6man always seems to know lots about this kind of stuff.....Mark Link to comment Share on other sites More sharing options...
F6 UTE - Track Bound EVO III - Member 3,367 Member For: 20y 1m 23d Gender: Male Location: Strapped in and holding on Posted 10/02/06 01:27 PM Share Posted 10/02/06 01:27 PM The rpm is only derrived rpm. You don't see a plug hooked up to #1 cylinder when the dyno run is taking place do you?? Link to comment Share on other sites More sharing options...
ktford FORD FORD FORD Donating Members 9,390 Member For: 21y 10m 21d Gender: Male Location: Victoria Point In Brissy's eastern side Posted 11/02/06 10:16 AM Share Posted 11/02/06 10:16 AM Take it to the track bro, when the light drops the bullsh*t stops. LOL Link to comment Share on other sites More sharing options...
F6_Tornado F6+300+ Member 940 Member For: 20y 2m 30d Location: In The Ute Posted 11/02/06 11:05 AM Share Posted 11/02/06 11:05 AM It make little to no difference to the KWS if it’s done in a different gear or you have different ratios.However it has a big difference on Torque.When I run the BF on the dyno last week I asked for a run in 4th as it was the closest to 1:1 out of the gearbox.. (Remembering the diff ratio is 2.93:1) we did this and the rwkws was identical upto the point when the dyno operator aborted the run @ 230kms and said that was as fast as he wanted to go on the dyno. Torque was less than in 3rd though.So results were:3rd or 4th = same rwkws3rd showed more torque than 4th Link to comment Share on other sites More sharing options...
Phoon Hoon Member 156 Member For: 19y 9m 28d Posted 11/02/06 11:05 AM Share Posted 11/02/06 11:05 AM Compare these 2...BA Typhoon 6spd Manual in 4th Gear @6000rpm = 191 km/hrand:BF Typhoon 6spd auto in 4th @6000rpm = 238km/hrBoth BF Phoons, both 6 speed, both @6,000rpm.manual = 191km/hauto = 238km/h.Thank God I bought the auto. Best thing to come out of Germany since my last video. Link to comment Share on other sites More sharing options...
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