All Things Mk5 > Performance Modifications

Do all tuners do a Dyno test after a remap?

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Homer:
Hi, was just wondering for those of you who have had a remap did the tuner run a before and after dyno to show you the results? Thanks

PDT:
We try to dyno tune everything that comes through the door for any form of mapping as its the only way to be certain that the car is running safetly and no problems have arisen during the upgrade.

Suppose it depends if the tuner that you go to has invested the £90k+ in the dyno equipment or not, many dont but serious tuners will. My dyno isnt working today, slight issue with a speed sensor, easy fix on monday but it feels like I have lost a limb! couldn't dream of tuning cars without a dyno, its the most valuable tool in the workshop, not in £££ terms but in ensuring that the customer leaves with a car that I have tuned to the best of my abilities, without the dyno I wouldnt be able to claim this and would feel I am cutting corners, but thats my opinion.   

Janner_Sy:
If a base map has already been developed, then a tuner can quite easily log the car on the road and optimise it just as well as he could on the dyno.  an example of this is a REVO remap.  its been developed on Dynos and lots of testing.  All the tuner needs to do is log the car on the road and adjust the settings to suit the car.  this is why most tuners charge for the remap and then say if you want a Dyno run, that is extra as they are mostly using it for figures and not to set the car up.

I do think that to develop a map you need a develop a map from the ground up a dyno is needed, but i know of tuners who rent out dynos to develop maps or do proper bespoke custom maps for big turbos etc, but once their maps are developed they no longer need the dyno, they can log the car on the road.

having a dyno doesnt make you a serious tuner.  Having a solid customer base with good reviews, customer service, and good maps make you a serious tuner.

PDT:
Well said Janner  :happy2:

The one element of any form of mapping wether it is Revo, o.e custom or aftermarket ECU tuning that throws up difficulties is mapping the igntion advance accurately, I have seen Revo software with -6 timing pull figures with timing settings of 6 make 10-15hp more with a timing figure of 4 and timing pull of 0.

On a dyno you can set timing by using the MBT method (minimum best timing) by holding the car under load at say 100% throttle @ 5250 rpm and advancing the timing as you watch the torque increase, you continue to add timing until the torque stops increasing, at which point you have reached MBT, often this results in the best torque output with zero timing pull. Quite often an over advanced engine will make less power. The same process can be carried out for fuel mixtures, for on road datalogging you can only aim at a paticular reccomended AFR (air fuel ratio) and not actually test which level of AFR makes most power and retains safe EGT's (exhaust gas temps).

(this is a generalisation and not based on any paticular engine type)     

heavyd:
You also get the likes of Superchips bluefin, done at your own home, second most popular remap on here, doubt many people had a free rolling road after installing it......

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