130 replies to this topic

[LordRagnar]

Give me a shout if you want that map sorted out, looks terrible to drive.

 

That would be great thing is your about 4hrs away 

[CHILL Gone DUTCH]

sizetenboots is mobile 

[LordRagnar]

I'm surprised no one has mentioned this already but torque and HP will always cross at 5252 RPM. Its a mathematical fact.

So your dyno chart is very weird and wrong.

 

That chart was the first one he did, he rang the re map guy and he told him to take out fuse 22 after that it was a totally different chart and totally different readings I didn't grab the new chart unfortunately but may drop in and get it and post it on here.

[siztenboots]

 

Give me a shout if you want that map sorted out, looks terrible to drive.

 

That would be great thing is your about 4hrs away 

 

 

I come to your premises or workshop , don't worry.

 

Tomorrow I am mapping over in the Brecon Beacons in Wales , so really its no bother to pop to you. I can also fly over to Sweden , or upto Aberdeen for some of the other TeamVXRacing clients.

[ditonics]

 

I'm surprised no one has mentioned this already but torque and HP will always cross at 5252 RPM. Its a mathematical fact.

So your dyno chart is very weird and wrong.

 

That chart was the first one he did, he rang the re map guy and he told him to take out fuse 22 after that it was a totally different chart and totally different readings I didn't grab the new chart unfortunately but may drop in and get it and post it on here.

 

The chart crossing at that point has nothing to do with your car.

 

ALL dyno chart readings will cross HP and torque at 5252RPM.

 

The thing is torque is measured and a real world thing. HP is mathematical and calculated from the torque and the RPM.

Given that it is an equation and has a constant, it will always cross at the same point. No exceptions, engine type, size, fuel, number of cylinder all make no difference to the equation and the cross point.

 

HP = Torque x RPM / 5252

[chickendippers]

Upon looking into AK Motorworx more I can see it's Rabbid who would be doing the mapping. You will be in very safe hands, the guy absolutely knows his stuff and is one of the most highly recommended Vauxhall tuners. Richard will look after you for sure.

[Exmantaa]

 

 

I'm surprised no one has mentioned this already but torque and HP will always cross at 5252 RPM. Its a mathematical fact.

So your dyno chart is very weird and wrong.

 

That chart was the first one he did, he rang the re map guy and he told him to take out fuse 22 after that it was a totally different chart and totally different readings I didn't grab the new chart unfortunately but may drop in and get it and post it on here.

 

The chart crossing at that point has nothing to do with your car.

 

ALL dyno chart readings will cross HP and torque at 5252RPM.

 

The thing is torque is measured and a real world thing. HP is mathematical and calculated from the torque and the RPM.

Given that it is an equation and has a constant, it will always cross at the same point. No exceptions, engine type, size, fuel, number of cylinder all make no difference to the equation and the cross point.

 

HP = Torque x RPM / 5252

 

 

Ehhhhh, not really. Just look at the different HP en Torque scales and calculate HP with above formula...

 

But I fail to understand how the ABS fuse can influence the dyno reading of a VX, as the ABS is not connected to the ecu. (well, at least not on a Z22SE version.)

I only know that the speed signal is necessary on most ecu's to prevent weird behavior...  

[LordRagnar]

Upon looking into AK Motorworx more I can see it's Rabbid who would be doing the mapping. You will be in very safe hands, the guy absolutely knows his stuff and is one of the most highly recommended Vauxhall tuners. Richard will look after you for sure.

 

Yeah thats defo the guy doing it, and he was the guy that told AK to take the fuse out.

[mbes2]

Just out of interest, was the dyno you used 4 wheel roller? As there are reports for exige v6 giving strange dyno reading as it's been found out it needs the front wheels rolling also.

[LordRagnar]

Yeah it was a 4 wheel dyno

[Arno]

As there are reports for exige v6 giving strange dyno reading as it's been found out it needs the front wheels rolling also.

 

That's because the V6 Elise/Exige has traction/stability control as standard and it always remains 'on' in some capacity even in 'Race' mode and the like, so on cars like these you need to spin up the front wheels too or the TC system cuts in.

 

The VX does not have this unless an aftermarket TC was fitted, so there's normally no need for any of this and just running it on a 2-wheel is fine. As the speed signal is picked up from one of the rear hubs anyway the driven wheels will also provide the ECU with the correct VSS.

 

Bye, Arno.

[LordRagnar]

Ok so had the remap done today by Rabbid, its now running 238hp, 300lbs/ft of torque The car is a lot more more progressive under acceleration rather than a sharp boost then dip then back on again. Overall very happy with the car now and its fuelling is now spot on unlike before where it was over fuelling.

[chickendippers]

Glad to hear, Rabbid is a brilliant mapper and glad you have it all sorted now. Enjoy!

[garw]

 adding to the discussion ,  ABS fuse causing wrong dyno readings

 

The speed signal generated by the ABS module connects to the instrument cluster , radio and ecu (see diagram)

 

The ecu does receive a speed signal ,  so if its true that the ecu uses this  signal in any way it would also be true that 

switching the ABS off will affect your power !

 

its not traction control as this signal would not tell the ecu the wheels are slipping

 

it would suggest the ecu has a map for power vs speed 

 

... i personally think the ABS on/off makes no difference to power 

 

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Edited by garw, 22 March 2017 - 09:12 AM.

[Pidgeon]

 

 

The ecu does receive a speed signal ,  so if its true that the ecu uses this  signal in any way it would also be true that 

switching the ABS off will affect your power !

 

 

It would be more accurate to state 'could affect your power'. 

[dominik]

If the front wheels have not the same Speed as the rears (for example staying still on a 2 wheel Dyno) the boost will be reduced during the measurment to almost zero.

 

Had mine on the Dyno at Böhmans near the Nürburgring , ABS light came on during the measurement, >>> about 60 Ponies less than the following supercharged exige 220.

Afterwards on the motorway it was totally different, I could easily overtake the exige at any speed.

A few weeks later on a 4 wheel dyno, no ABS light, and  everything was measured correct.

Edited by dominik, 22 March 2017 - 11:22 AM.

[LordRagnar]

You where on  2 wheel Dyno , correct me if not.

 

If the front wheels have not the same Speed as the rears (for example staying still) the boost will be reduced during the measurment to almost zero.

 

Had mine on the Dyno at Böhmans near the Nürburgring , ABS light came on during the measurement, >>> about 60 Ponies less than the following supercharged exige 220.

Afterwards on the motorway it was totally different, I could easily overtake the exige at any speed.

A few weeks later on a 4 wheel dyno, no ABS light, and  everything was measured correct.

 

 

 

It was a 4 wheel dyno I was on. I don't know why but it only gave correct readings with the ABS disabled.

[mbes2]

300ft/tq is very high, what clutch do you have?

[mementaurum]

How is the condition of the air filter?

[Nev]

I'm thoroughly confused by this thread.