Flat spot at 5200rpm on 2.0T - Does yours do it?

[jonnyc]

Didnt quite mean it like that, meant as in the cars affected were fine, till stage 2 plus. Thats the only fact we have on the issue, and even after all this time we havent come any closer as to working out why!

How comes your fuel was set at 9? Would have thought you be running 6?

Hmm.. Is an odd one, but if its fuel related then running the car leaner will help as it will lower the fuel request.. Although, I can't see it being that with a K04.. The injectors are more than upto the job..

Fuel is 9 because lean is fast! 

[Poverty]

Didnt quite mean it like that, meant as in the cars affected were fine, till stage 2 plus. Thats the only fact we have on the issue, and even after all this time we havent come any closer as to working out why!

How comes your fuel was set at 9? Would have thought you be running 6?

Hmm.. Is an odd one, but if its fuel related then running the car leaner will help as it will lower the fuel request.. Although, I can't see it being that with a K04.. The injectors are more than upto the job..

Fuel is 9 because lean is fast! 

revo seem to recommend fuel 6 to people thats why I was wondering why 9. I will try leaning mine out a bit once my vcds arrives.

[jonnyc]

revo seem to recommend fuel 6 to people thats why I was wondering why 9. I will try leaning mine out a bit once my vcds arrives.

I have ran 9 from the start, thats within safe AFR limits so why not.. May as wel use less fuel and go faster at the same time..

Sneak up on the timing though, I managed to run 7 but my IAT's were always very low with no A/C etc.. 6 is usually the limit on V-Power..

[Poverty]

revo seem to recommend fuel 6 to people thats why I was wondering why 9. I will try leaning mine out a bit once my vcds arrives.

I have ran 9 from the start, thats within safe AFR limits so why not.. May as wel use less fuel and go faster at the same time..

Sneak up on the timing though, I managed to run 7 but my IAT's were always very low with no A/C etc.. 6 is usually the limit on V-Power..

Thanks will keep that in mind

[david_phillips95]

After doing some logs today i noticed a few things,

1. Running B9T5F6 the AFR was running around 0.78 - 0.80 which equates to around 11.3:1 - 12:1 this could be leaner.
2. Running B9 causes the boost to come in really hard around 3000rpm peaking at 1.6bar - 1.7bar  then drops rapidly to around  1.4 -1.5bar and holds there till 6000rpm where it drops again to around 1.3 - 1.35bar
3. My MAF readings have always been around 270g/s on various logs

i have noticed when driving B9T5F6, the power comes in really hard then tails off as the revs progress.

I decided to try out B7 T5 F9 (less boost and leaner AFR) - car feels much stronger through the gears, far more progressive, no more flat spots in 4th (still to do some more testing to confirm 5th gear)
 
with B7T5F9 the boost comes in at around 1.5bar around 3000rpm and drops to around 1.4bar and holds right through to around 6000rpm, boost is around 1.3bar from 6000rpm till redline
AFR is running alot better now with F9 and is around 12:1 -12.5:1 which is alot better than 11:1 it was previously running.
Noticed a big difference with the MAF readings also at 6600rpm to 7000rpm my reading is now 300g/s - 306g/s

The car now pulls the way i feel it should have from when i went stage 2+ really surprised that backing the boost off and changing the fueling would make such a big difference.

Hopefully get a chance tommorow to do some more testing, ill try and get some thorough logs done and post them up.

As Revo say in the SelectPlus Guide:
"The Boost level can be set higher or lower than the default setting (Boost 6), altering
the driving characturistics of the car. As with Timing settings ‘bigger is not always
better’"

Cheers Davie

[gazbutS3]

^^^^^^

good informative write up David

[NEWEY]

my date to get this sorted has been put back to the 27th as milltek are dragging there arse waiting for parts for the cat. theve only known about it for just over a month

[cuprak1]

After doing some logs today i noticed a few things,

1. Running B9T5F6 the AFR was running around 0.78 - 0.80 which equates to around 11.3:1 - 12:1 this could be leaner.
2. Running B9 causes the boost to come in really hard around 3000rpm peaking at 1.6bar - 1.7bar  then drops rapidly to around  1.4 -1.5bar and holds there till 6000rpm where it drops again to around 1.3 - 1.35bar
3. My MAF readings have always been around 270g/s on various logs

i have noticed when driving B9T5F6, the power comes in really hard then tails off as the revs progress.

I decided to try out B7 T5 F9 (less boost and leaner AFR) - car feels much stronger through the gears, far more progressive, no more flat spots in 4th (still to do some more testing to confirm 5th gear)
 
with B7T5F9 the boost comes in at around 1.5bar around 3000rpm and drops to around 1.4bar and holds right through to around 6000rpm, boost is around 1.3bar from 6000rpm till redline
AFR is running alot better now with F9 and is around 12:1 -12.5:1 which is alot better than 11:1 it was previously running.
Noticed a big difference with the MAF readings also at 6600rpm to 7000rpm my reading is now 300g/s - 306g/s

The car now pulls the way i feel it should have from when i went stage 2+ really surprised that backing the boost off and changing the fueling would make such a big difference.

Hopefully get a chance tommorow to do some more testing, ill try and get some thorough logs done and post them up.

As Revo say in the SelectPlus Guide:
"The Boost level can be set higher or lower than the default setting (Boost 6), altering
the driving characturistics of the car. As with Timing settings ‘bigger is not always
better’"

Cheers Davie

What car, what turbo and what revo stage map and what supporting mods do you have ?

Will the car in 4th rev right round to 7k without pausing and pulling back at about 5k revs?

[david_phillips95]

What car, what turbo and what revo stage map and what supporting mods do you have ?

Will the car in 4th rev right round to 7k without pausing and pulling back at about 5k revs?

Audi S3, K04 Turbo, Revo Stage 2+, Evoms CAI, Uprated OEM Diverter Valve, Forge Catch Can Kit, MV Sport DP, NGK Iridium Plugs

The car was pulling right through 4th gear with zero pausing at the usual spot around 5k revs. I will take the car out today and see how its running. I want to try a few different scenarios to see if the flat spot is gone.

Cheers Davie

[cuprak1]

What car, what turbo and what revo stage map and what supporting mods do you have ?

Will the car in 4th rev right round to 7k without pausing and pulling back at about 5k revs?

Audi S3, K04 Turbo, Revo Stage 2+, Evoms CAI, Uprated OEM Diverter Valve, Forge Catch Can Kit, MV Sport DP, NGK Iridium Plugs

The car was pulling right through 4th gear with zero pausing at the usual spot around 5k revs. I will take the car out today and see how its running. I want to try a few different scenarios to see if the flat spot is gone.

Cheers Davie

Hmmm, sounds good. Please let us know the outcome.

Might get my fuel level raised on mine, the flat spot is doing my head in, its like the ecu is pulling back somewhere.

[vRS Carl]

Well my car was having the flat spot issue too.

Skoda Octavia vRS, K03s Turbo, Revo Stage 2+, Miltek TBE, Autotech FP, Neuspeed Turbo Outlet, EVOMS, S3 intercooler B9 T7 F6 (As recommended by Revo.

I decided after reading David's post i would go out change my settings to B7 T5 F9 do some logging and see what happens.

I was shocked to say the least. The car now pulls a lot more cleanly and from logging it appears to be making more power on B7 T5 F9 (working of the Air Mass g/s measurement) On B9 T7 F6 i had timing pull of around -2.3 to - 3 on a couple of cylinders through the rev range.

Whereas now there is no timing pull whatsoever and the car is making more power despite having less boost.

Have a look at these logs







Very healthy from what i can see

So maybe the best settings for a Stage 2+ car are B7 T5 F9

Carl

[GTIjames]

logs are looking very healthy Carl 

It would be interesting to hear what Revo say about this - having advised us all to lower the Fuel after fitting a CAI 

Seems JonnyC knows more about their software than they do

[micky 32]

I always thought  F9 was the setting for stage 2+ on a ko3.

[vRS Carl]

I've emailed them to Keith @ JKM to see what he thinks aswell

Carl

[vRS Carl]

I always thought  F9 was the setting for stage 2+ on a ko3.

So did i but when i was trying to find the problem with the low power runs on the Dyno i sent loads of logs to Kev at Revo and he specifically stated for me to run B9 T7 F6

Carl