Quote:
Originally Posted by tikku.dk Hi chetan, for accurate results, put your car on a shaft dyno, gives accurate results, dynapack of RRP is shaft dyno. The one u tested seems to b inertia dyno.[b] |
Hi Tikku,
Checked RRP website:
http://www.redroosterperformance.com...controller=cms
Looks like RRP has dynapack
only for the front wheels. In case of a shaft DYNO, traction / friction loss is not effected. Whereas, in case of an inertia dyno, on-road experience is simulated.
We can measure power/torque at the crank, wheel-shaft and at the wheel. Measuring at the wheel by inertia, gives us the power/torque delivered at the wheels after all losses.
Problem here is the cheat software, masking performance. Only a four-wheel Dyno can solve the issue and make a difference.
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Originally Posted by d3mon Wow, these figures are with the remap? These seem to be quite some way off from the expected numbers with the remap. Sounds like the defeat device does curtail emissions (and performance) with a very heavy hand when it detects emissions testing. |
Yes. I was surprised and for a moment, thought that I had wasted my money on the remap! Looks like the torque/power curve (spread) is also different for an actual run - Not just the peak values.
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Originally Posted by d3mon I'm wondering what would happen if you dyno tested with the wheel speed sensors (for ABS) disconnected. Would it fail to be able to detect that it's on the dyno and not cut the power? |
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Originally Posted by Vid6639 Yes. This is what I was going to say. There was a video online which did the comparison with the rear wheel speed sensors disconnected. That way the ECU doesn't go into cheat mode. |
Once the car was on the DYNO, most lights pertaining to ABS started blinking and the engine would not rev beyond 3000 RPM or so. Then Karthik (RD) asked me, if there was a switch to turn off ESP. There is no switch and also, I had not carried my VCDS. Obviously, this was not anticipated.
Then suddenly, all those lights stopped blinking and were permanently lit - After this the engine revved all the way till the red line. We thought that the ECU had recognised the car being tested, switched-off the ESP (ABS?) and changed the MODE.
Not sure what will happen if I turn-off ABS/EBD/EDL/ESP through VCDS, before DYNO. I can still do it; but the problem is the DYNO costs 3k after all discounts! I therefore thought that I will wait until I get a 4-wheel DYNO and try it.
Damn it! It is very interesting and tempting!!
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Originally Posted by Vid6639 Secondly are the given power/torque outputs after correction? |
Yes. Both Temperature (32 degrees centigrade) and Altitude (3000 ft) were taken in to account. Correction factor was roughly around 1.13
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Originally Posted by Vid6639 Is the cheat mode a hidden map that the remap does not overwrite?
Ideally you wipe out the entire OE map and flash the new remap onto the ECU after taking a backup. So why will the car switch to cheat mode? |
Hi Viddy, This is from my understanding:
Service / Manufacturing / DEMO / Testing
MODE parameters can be part of the software. These parameters can be permanently frozen, as it need not take user requirement in to account. This can be hard-coded like any other programme sequence.
Parameters for actual driving can be stored as
look-up tables. There can be different table for fuel intake / air intake / EGR valve position / torque limiter .... etc. Some of these tables can be programmed to
learn and
adapt to the driving pattern of an individual. These tables are generally referred-to as
MAPS by the programmer.
In case of a ECU remap; Entire ECU software is first down-loaded. Only the MAPS are tweaked and then, the entire software is flashed on to the ECU.
MODE is untouched as it is part of the
software / programme.
Please correct me if I am wrong.
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Originally Posted by d3mon Yes, you write the entire package after tweaking only a few maps. |
You are right.
I see 3 steps.
1.
Cheat mode: Peak power / torque is slightly limited compared to the stock rating. Torque band is considerably reduced.
2.
Stock rating: Peak power / torque may be slightly better than the cheat-mode. But the power/torque
spread more than makes up for the loss.
3.
Remapped rating: This practically replaces the second point. Peak power / torque is boosted and the spread can also be
altered to enhance driveability.