468 replies to this topic

[CHILL Gone DUTCH]

One thing I have wondered is The fact your not running a Tmap means the car is less likely to retard due to the inlet temps now Are we who are running a Tmap missing a trick or are we over analysing things

[CHILL Gone DUTCH]

Or is the loss of power simply down to the hot intake temps or is it the Ecu protecting the engine or both

[Captain Vimes]

Knock from power runs below...

 

+1.77

 

+1.77 x 2

[CHILL Gone DUTCH]

Anything below 1 is ignored

[CHILL Gone DUTCH]

Just reduce the areas over one by 1.77 from the 1.77 x2 Then carry out a other power run And look at results

[CHILL Gone DUTCH]

After the results from that power run Reduce anything over 1 by 0.35 But increase anything less than 0.5 knock by 0.35

[CHILL Gone DUTCH]

The more you fine tune this the better your map will be ( closer to best available ) But it's also good to do a other fuel learn and knock Learn sessions after making big changes.

[CHILL Gone DUTCH]

also plot your WOT boost pressure so you can home in on your peak map

 

[CHILL Gone DUTCH]

After you have done the WOT mapping you can add ignition at lower pressures throughout the rev range followed by a final knock learn session across the rev and pressure ranges to pull out any excess knock under non WOT conditions 

[Captain Vimes]

Thanks Chris. I'll go and annoy the locals with several full throttle speed runs and report back!

[CHILL Gone DUTCH]

The more you put in the more you get out 🙈

[Captain Vimes]

Just to add that the power drop 200rpm before the limiter is consistent. If I raise the limit, the torque carries on. I'm convinced the power drop is either a measurement issue or a soft limiter. Either way, I'm happier leaving the limit at 6.8k and will optimise below that. I'll try a power run without hitting the limiter so hard or in 3rd gear to see if it goes away.

 

The 2 runs below are from the same day with a 6.7k and 7k limit.. both dip 200rpm rpm before the limit.

 

 

[Captain Vimes]

[font="arial, sans-serif;"]Did a few more runs this evening and the strange drop off at the top was being caused by hitting the rev limiter and not getting off the throttle quick enough. [/font]

 

[font="arial, sans-serif;"]x2 different runs, the first trying to lift just before the limiter and the second bashing the limiter...[/font]

 

[CHILL Gone DUTCH]

So the run where you haven't hit the limiteror predicted the limiter looks quite a bit better/smoother right up at the top ?

[Acidpopstar]

Is that hitting 280? Are you worried about your engine?

[Captain Vimes]

So the run where you haven't hit the limiteror predicted the limiter looks quite a bit better/smoother right up at the top ?

Correct, although it's not just right at the top. I've tried repeating the measurements with hitting the limiter vs not and the readings are consistently different from 6k through to 6.8k

[CHILL Gone DUTCH]

Are you releasing the throttle slightly Or snapping it shut

[Captain Vimes]

Is that hitting 280? Are you worried about your engine?

No. The 180 was logged on a 1 way run and must have been slightly down hill at the end, hence the strange wiggle. Plus all measurements yesterday looked a bit high compared to previous runs - I may have got temp/humidity values wrong.. Max power is around 250 ish...

[Captain Vimes]

Are you releasing the throttle slightly Or snapping it shut

Snapping it shut otherwise it'll hit the limiter.

[CHILL Gone DUTCH]

You will be running more power because of the cooler damper air I'm yet to prove this bit the higher power cars suffering more especially the Harroped cars I estimated I'm losing 60 hp between what I had at snetterton compared with now on the same map

Edited by CHILL Gone DUTCH, 04 March 2016 - 12:17 PM.