34 replies to this topic

[Bargi]

My experience with them was very good. The guy who I dealt with was happy to strap down the VX (forget his name but 5 o'clock will probably know) Results matched Dutch power run and 2 other dyno's very closely

[rokkan]

Hello, I've captured two runs using OPCOM - it's the first time I used the data logging facility so i'm not 100% the data has recorded correctly. In fact it looks like driving miss daisy - making me think that it did not record correctly.

Intake Air Temperature is approx 23 throughout the journey (about a 15 min drive).

Boost - I've mapped boost into the a line graph. Is there another variable I should be comparing this to? e.g throttle position, engine speed?

Unless there are relatively straight forward checks / fixes I can do I'll stick with the plan of having courtney work the magic.

Thanks for all the advice so far!

2016_08_31 VX Boost Graph v2-1 by mkr2009

[Raptor]

I'm retracting my earlier comments about the Eurospec RR.

[Nev]

I doubt it's the map thats affecting it so much (though I expect it could be improved), more likely to be a electro/mechanical problem which I am sure CS will find promptly.

 

Let us know what they find.

Edited by Nev, 01 September 2016 - 07:04 AM.

[TFD]

How does the car feels?

By the look of the graph you should feel the difference at 5500rpm...

 

1st thing is the lack of power building till 5000rpm... Heck, power is even dropping.

Then you go ridiculous rich (almost bore wash rich = NOT good) and start to gain power. This is strange as well. Going THAT RICH (10-11:1) will cost you power.

 

Is 1 bar of boost the correct amount a stage 2 shold boost?

 

I should not concentrate on the power, but first find out why the curve is all over the place. Could be a faulty run or could be something bigger.

[rokkan]

Hello, yes you can definitely feel a noticeable flat spot circa 5k. The strange thing is that the car still pulls well however without a back to back comparison it is difficult to tell. I'm not chasing power however I am trying to get the most out of the stage 2 performance. The car was also RR'd at AMD and gave an equally confusing graph. Thanks, Mark

[scw02102]

problem is your map

 

I had one and best thing I did was remove it, had a real mapper look at it and he was very polite but said it wasn't correct or any good, very very generic with setting that made no sense and no knowledge to what was being assigned. EG fueling request, completely out of the range of standard injections, thats not what I call a good map LOL

 

My map was making boost come in too strong too early then the ecu was actually shutting down the throttle automatically which I thought was a flat spot. Dave and Adam from here had same maps and guess what exact the same issues. Since they both removed the map and getting a proper one they and I have smooth boost, 30bhp mid range and loads more toque, plus I know its not on there which is a bonus LOL

 

I'm sorry to say I know of 2 other VX on here who had the same map who complained of similar power delivery and issue changed to a proper map from trust vx mappers and problem solved

 

My AMD map had a big power drop around 4-5k too

 

 

[Sutol]

Had mine done at Eurospec and the chap (forgotten his name) asked me if I'd had it done before. Told him it got 250 at CS who used a dynojet and he said that the DynoDynamics would give a lower figure and it did - 232.

[rokkan]

Thanks to all those who have helped so far. Last week I took the car to Courtney and the results are in. It would appear the poor performance is solely down to the map. In the graphs below, blue is the car as it walked through the door, red is the standard map, green is an example of a Courtney map on a VXT with a Miltek. 

 

As you can see from the below, with the car now running a factory standard map, the flat spot is gone and it produces slightly more power albeit with less torque. As a result of going back to standard, the car drives noticeably better - it now pulls throughout the rev range opposed to for the first 4k, 

 

Unfortunately we ran out of time to fit the Courtney map as the car flagged a fault that we couldn't resolve on the day.

 

It was definitely worth the trip to Courtney; it's a long way but they know what they are doing.  

 

Thanks again to those that contributed.

 

 

 

 

 

 

[Raptor]

What was the flagged fault?

[rokkan]

Hello, flagged fault is the P0340 (camshaft position sensor). After some trial and error this was tracked down to a fault on the ECU. Next step is to get the ECU repaired. 

 

[TFD]

Good to see you've found the error.

How much boost is stock btw?

[siztenboots]

oem - held boost 8-9 psi , overboost upto 12 ( depending on actuator condition )

[Nev]

Amazing how the old map was THAT bad, seems beyond belief that a mapper would let that out of his garage, though maybe some failed parts/sensors have contributed to the issue.

[scw02102]

told you it was the map, the map is poor and the ecu starts closing the throttle hence the power drop off 4, least its off the car

 

Glad you made some progress and the car is on the right road