Pmsl.

 

Same tyre's, or wheels, or pressure?

 

Yes, unless the time on the dyno heated up the tyres raising the pressure.

 

You should have seen mine (HKS rs hard pipe), the crud was so thick I literally had to scrape the stuff with a wire brush with a some chemicals. I put a simple trap inline to condense the vapors which works pretty good.

Evoscan at the time would have sure made this alot easier to figure for you

 

How about knock on the first on first dyno resulting in a low octane number and then was reset when the bettery was taken off during installation of the fuel pump.

 

Possibly, but the car was an FQ340 with exhaust and seemed to make fairly sensible stock figures. I don't actually know for sure if the fuel pump was installed before all the runs.

It still looks like the gains are not what they appear to be from a casual glance at the plots?

 

John -- What changes were made to the ECU? It appears that you increased boost ~2psi which could result in 20 - 30 hp, but there was likely something else going on (too bad you don't have knock counts and boost curves before / after)...On the first run, was the car actually in limp or cold start mode and not truly hitting the ~17+ psi or on the low octane map (those are the only things I can think of without more data)??

Interesting side note -- this car was an FQ340 but only put down 300 whp (I guess 340 is at the crank)? I guess that means my IX that is putting down 330+ whp (TBE, UR high flow cat., fuel pump, 24psi peak, and jestr flash) would compare nicely to the FQ340 ....Why is this car (the FQ340) not hitting higher boost, don't you have higher octane 'petrol' in the UK ? I would have thought that you would be more like 25/26 + psi....

 

The ECU had the fuel cut raised, an external boost controller was controlling the boost. The fuel map was changed a little.

The ignition timing and valve timing were unchanged.

The initial run seems to be running the expected boost level and the fuelling isn't excessively rich (it is leaner than the after tune). I cannot see why it would run the low octane map or pulling any knock sum - the ignition map is about 3 degrees from detonation on the fuel it was running with the 3" decat exhaust. When I later logged this map on the road the knock sums were negligible. It is a very safe, warranted map on the FQ340 which is quoted at 345 BHP flywheel.

20-30 HP gain for 2 PSI alone with no changes to timing and richer fuelling is very optimistic I think from an efficiency point of view. As I've illustrated at 6000 RPM the charge pressure is only 4% higher so I would oinly expect up to 12 HP gain.

I feel that this is the tip of the iceberg of flawed before-after graphs that show excessive gains for tiny increments in boost.

Your setup should be making way more than the FQ340. But that isn't difficult

The graphs I show are not my tuning. They are from the tuner that tuned the car when the last owner had it. I was disappointed with the performance right from the start. My present map whilst using the same spec of car apart from airbox mods is in a different league for performance to the above.