Top Speed Limited? Dyno Run Problem

[niggly]

Appreciate faintly ridiculous but I have a 2011 C30 1.6D D2 DRIVe that I had performance remapped back in July 2016 as I wanted a bit more poke. The map, by VIEZU, specified the increase in bhp and torque that could be expected.
Found an outfit localish to me, near Brands Hatch, who do a rolling road dyno run for £40. So I decided to give the car and myself a late Chrissy present and see what the remap has ACTUALLY delivered - has it delivered what they said on the tin.
I've never done one before so it was also interesting for me to see how it is done, what goes on. Naturally inquisitive and like learning.
Nub of it was the car wouldn't rev to the red line. He had it in 6th. We turned off the DSTC. Handbrake has to be on hard as the fronts wander on the rollers. We wondered if the electronics sussed that the handbrake was on, but decided it wasn't that.
The car was getting to 120mph, in 6th, and would not rev further, go faster. So we decided to have a go in 5th.
And then the software glitched on their PC and the guru who knows how to reset it all wasn't there. So I'm going back sometime this week to have another go.
Sorry, long story.
Sooooo, is it speed limited? What is stopping it revving to the red line? Any ideas which element of the super complicated electronics is kicking up?
Must be said, given their location, 1.6D Volvos aren't their normal fare.

[Tannaton]

Originally Posted by niggly

Appreciate faintly ridiculous but I have a 2011 C30 1.6D D2 DRIVe that I had performance remapped back in July 2016 as I wanted a bit more poke. The map, by VIEZU, specified the increase in bhp and torque that could be expected.
Found an outfit localish to me, near Brands Hatch, who do a rolling road dyno run for £40. So I decided to give the car and myself a late Chrissy present and see what the remap has ACTUALLY delivered - has it delivered what they said on the tin.
I've never done one before so it was also interesting for me to see how it is done, what goes on. Naturally inquisitive and like learning.
Nub of it was the car wouldn't rev to the red line. He had it in 6th. We turned off the DSTC. Handbrake has to be on hard as the fronts wander on the rollers. We wondered if the electronics sussed that the handbrake was on, but decided it wasn't that.
The car was getting to 120mph, in 6th, and would not rev further, go faster. So we decided to have a go in 5th.
And then the software glitched on their PC and the guru who knows how to reset it all wasn't there. So I'm going back sometime this week to have another go.
Sorry, long story.
Sooooo, is it speed limited? What is stopping it revving to the red line? Any ideas which element of the super complicated electronics is kicking up?
Must be said, given their location, 1.6D Volvos aren't their normal fare.

Some of the diesel models don't get to the red line - the governor on the engine kicks in just before.

Volvo's do have speed limiter options in the software and you can see if this is set using VIDA. I've not looked at it recently but early XC90 and XC70 where limited to 120 mph.

[niggly]

Originally Posted by Tannaton

Some of the diesel models don't get to the red line - the governor on the engine kicks in just before.

Volvo's do have speed limiter options in the software and you can see if this is set using VIDA. I've not looked at it recently but early XC90 and XC70 where limited to 120 mph.

Thanks Tannaton. Thinking back I think he said it only revved to 3,000rpm ..... and speedo was reading 120mph. But that doesn't make sense because I know the car is doing 60mph at 2,000rpm in 6th, because 2,000 is the torque peak and I know it will pull hard from 60mph in 6th, don't need to go down to 5th.
So 120mph should be about 4,000rpm, not 3,000.
Have to go back this week and see what happens.

[SwissXC90]

Originally Posted by Tannaton

Some of the diesel models don't get to the red line - the governor on the engine kicks in just before.

Volvo's do have speed limiter options in the software and you can see if this is set using VIDA. I've not looked at it recently but early XC90 and XC70 where limited to 120 mph.

My MY2009 XC90 D5 diesel is speed limited to 220 kmph / 136 mph.
I've only ever had it up to 160 kmph / 100 mph on the German autobahn

[GreenBrick]

I know that some Mercs have a dyno mode, so that they will behave as expected when the front wheels are not turning at the same speed, could this have been an issue? Feel free to ignore me if not.

My dad's golf mk2 had a better top speed in 4th than 5th, so I guess that was down to the torque curve.

I believe that choosing the right gear for a dyno pull is quite important.

[T5Sweep]

Bearing in mind that diesels usually make peak power long before the red line anyway. Did you see the numbers you were quoted?

[Tannaton]

Originally Posted by GreenBrick

I know that some Mercs have a dyno mode

So do some VW's... the cabin air-freshener pumps geranium and honeysuckle scent out of the exhaust and the radio re-tunes to Classic FM :-)

[niggly]

Originally Posted by T5Sweep

Bearing in mind that diesels usually make peak power long before the red line anyway. Did you see the numbers you were quoted?

Hi Sweep and everyone who posted. I went back and did it again. This time we used 5th not 6th. It IS speed limited ..... to 120mph. It revved to 4,300rpm. Torque peaked at 2,272rpm. Power peaked at 3,651rpm.

I will confess, with a red face, that the results were, ummmm, disappointing. Given I spent £350 on the Viezu remap on 12th July 2017.

Here are what it should all be:

Volvo 1.6 D2 Drive 115 bhp (2010-2013)
Original
Original BHP: 115
Original Torque: 199lb ft

Published/Advertised Gain fromRemap
Power Map Power: +30bhp
Power Map Torque: +44lb ft

Should therefor be:
Remapped BHP: 145
Remapped Torque: 243lb ft

But what it came at as was:
Power 119bhp
Torque 200.4lb ft

So pretty much exactly what it should be 'out of the box' when it was new in September 2011. It has now done 107,000 miles.

What do you all reckon? Should I be having a chat with the guy who did the map, as well as Viezu themselves? Thoughts as to what 'yeah buts', excuses I'll get as to why the remap doesn't seemed to have done a lot?

Yes it has been twice since the remap to a main stealer and no they definitely didn't overwrite the map - I made 100% sure they understood and did NOT plug in at all and download anything.

[kenny]

I think I would having a chat with your mapper but the drop in HP could be down to some underlying issue so a scan for fault codes might be an idea.

[niggly]

Originally Posted by kenny

I think I would having a chat with your mapper but the drop in HP could be down to some underlying issue so a scan for fault codes might be an idea.

Not sure what drop in horsepower you mean? On the dyno it is a (very meagre) increase over standard of 4bhp. Standard = 115, now = 119. There is no drop. Torque is up an infintessimal 1lb ft!!

It was scanned for fault codes by the main dealer on 31/10 2,00 miles ago and there were none, it was clear. And performance is identical now as then. To be fair it actually goes really well. For a lowly 1.6D you can get it trucking along quite briskly. To the extent that I assumed the map must havedelivered more than the standard numbers. I didn't get it dynoed because I was unhappy with the performance - purely out of interest.

Yes absolutely I will be having a chat with the mapper and, depending what he comes out with, Viezu themselves.