All Things Mk5 > How to Guides / Troubleshooting

Problems with Stage 2+

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vRS Carl:
Ok i did post this in another thread but was advised to start a new one so here it is

Just be aware with Stage2+ On REVO you may not get what you expect on the Dyno.

For some reason i believe the latest Stage2+ REVO code doesn't like the Dyno and no matter what Timing advance you set (even 9) it will show no timing pull whatsoever. Also the car will not request Maximum boost AT ALL throughout the rev range.

However get it on the Road and it all performs as expected. Assuming you have no problems with the Car to start with it will request 2500+mbar of boost and give it from about 2500rpm to around 4200rpm before starting to slowly tail off. The car will also start to show timing pull (dependent on car) from about 4 upwards.

I spent nearly 2 weeks trying to find a phantom problem with my car only to discover it may be the code  :mad:

But to highlight it a bit easier

I had Stage 2+ flashed (my car has every conceivable mod for a KO3s TFSi)
 
Stage 2 i had 257bhp and 302lb/ft (only CBE though)

Stage 2 + and TBE i got 264.5bhp and 285lb/ft  :confused:

After 2 weeks and changing a few parts on the car for brand new ones (plus the car engine was stripped cleaned checked rechecked and put back together 4 TIMES looking for boost leaks etc) the car was put back on the Dyno

Result 265bhp and 287lb/ft :mad:

When looking at the logs the car (on the dyno) would not request max boost as it should highest was 2450mbar at 4400rpm which is too late and at 2500rpm it was only asking for 2290mbar

However put the car on the road and the following happened (and consistenly over 30+ logging runs)

At 2500rpm the car would request 2500mbar and give 2560 mbar actual (at some points it gave 2580)
This would be held all the way to 4200 rpm where it would start to slowly tail till at approx 6000rpm it was still holding 2100mbar of boost

So the final result was (after some clever calculations from boost logs etc using VCDS):

On the dyno 265.1bhp and 287lb/ft

On the road 282bhp and 331lb/ft

The calculations were checked against the Dyno results and were found to be accurate (within 0.5bhp and 2lb/ft which i knocked off)

So in reality my car has 282bhp and 331lb/ft but on the Dyno shows 265bhp and 287lb/ft

So if you are getting Stage 2+ dont be disheartened by the results

Use VCDS and the instructions on the Rosstech website and you will get a better answer on what your car has

This is not just specific to my Car. I know of 3 other cars with the same problem. Also the rollers that were used have been used by members on this Forum and on Briskoda, Cupra.net etc are regarded as very very accurate. I am not naming the company though as they have asked not to be until they have done more research into the problem to present to REVO if needs be

HTH

Carl

Deako:
Carl, could this be down to air flow to the engine bay, and an adverse effect on intake/intercooler temps?

SteveP:

--- Quote from: Mater on August 24, 2009, 01:24:08 pm ---This is not just specific to my Car. I know of 3 other cars with the same problem. Also the rollers that were used have been used by members on this Forum and on Briskoda, Cupra.net etc are regarded as very very accurate. I am not naming the company though as they have asked not to be until they have done more research into the problem to present to REVO if needs be

HTH

Carl

--- End quote ---

It doesn't take Sherlock Holmes to figure out which company/set of rollers your refering too  :grin: :grin:

vRS Carl:
I'm not sure and neither are those who are looking in to this at the moment

When my car was done all the intake temps where fine, there was no wheel slip on the rollers etc (the guy that does it is regarded as the best and he even checked all the logs etc to see if there was any evidence of wheel slip, Intake temps etc just to satisfy himself that they werent the problem)

Basically what is happening is from about 2500rpm to around 3700rpm the fueling is running too rich on the Dyno

Yet on the road it is absolutely fine.

It's a strange one and will take someone with brains bigger than mine to figure this out.

Carl  :happy2:

john_o:
out of interest have you tried a different dyno ?

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