Dyno yet again!

[GSI_Daz]

OK, thanks to Michael (biglump) we now have figures for:

1) (Green line) Standard 6.0 VXR
2) (Pink Line) 6.0 VXR with Wortec cat-back
3) (Red Line) 6.0 VXR with Wortec full exhaust

All figures are RWHP.

Graph here

The standard 6.0 VXR showed just under 370FWHP which is well down on Vauxhall's claim. Cat-back was 399 and Full Exhaust 414.

Would be interesting to see a graph for a standard 5.7 VXR, anyone got one?

P.S. Good to meet you Michael, I had forgotten how quiet the std 6.0 was!

Edited by GSI_Daz on Friday 1st September 17:36

[ringram]

Nice job lads. Shows the excellent gains from exhaust and tune.
Did you get rear wheel stats?

Edited by ringram on Friday 1st September 20:42

[BO55 VXR]

ringram said:

Did you get rear wheel stats?

GSI_Daz said:

All figures are RWHP.

[Woody vt]

GSI_Daz said:

The standard 6.0 VXR showed just under 370FWHP

Edited by GSI_Daz on Friday 1st September 17:36

Is this not Flywheel HP???

[Woody vt]

Just being pedantic

[BO55 VXR]

Good work guys. We can now all see the gains that can be made my adding the various toys.

[GSI_Daz]

There must be someone out there with a graph from a std 5.7

[ringram]

Yeah ok graph is RW but your text is FW.
Just wondering if you had RW in text as its hard to get an accurate reading from the graph.

Makes sense now. Basically 251rwkw max for full bolt on LS2. The gauntlet is laid.

[GSI_Daz]

ringram said:

Just wondering if you had RW in text as its hard to get an accurate reading from the graph.

Headers = 336.7
Cat-back = 322.1
Std = Just under 300

I haven't got the figure for std, maybe biglump can add it?

[Dan_S V8]

GSI_Daz said:

ringram said:

Just wondering if you had RW in text as its hard to get an accurate reading from the graph.

Headers = 336.7
Cat-back = 322.1
Std = Just under 300

I haven't got the figure for std, maybe biglump can add it?

Is that all? Guys in the USA are seeing on average 340rwhp from STANDARD LS2 GTO's. Something here doesn't add up...

[ringram]

Im sure thats full bolt on though. The full bolt on one is pretty much exactly that.

Being that the tunes are available direct from Vauxhall dealers there may be a little more safety margin in the tune too.
Running sharp fueling and timing is all very well if the owner takes responsibility but otherwise most tuners will want to err a little more on the side of caution for obvious reasons.

[bennno]

GSI_Daz said:

OK, thanks to Michael (biglump) we now have figures for:

1) (Green line) Standard 6.0 VXR
2) (Pink Line) 6.0 VXR with Wortec cat-back
3) (Red Line) 6.0 VXR with Wortec full exhaust

All figures are RWHP.

Graph here

The standard 6.0 VXR showed just under 370FWHP which is well down on Vauxhall's claim. Cat-back was 399 and Full Exhaust 414.

Would be interesting to see a graph for a standard 5.7 VXR, anyone got one?

P.S. Good to meet you Michael, I had forgotten how quiet the std 6.0 was!

Edited by GSI_Daz on Friday 1st September 17:36

Why quote FWHP when you dont have this? Just quote RWHP when thats your results.

This still shows nothing categoric as that would require the same car to be dynoed, pre exhaust, post cat back fitment and post full system fitment.

Its quite possible from the stats that the first wasnt healthy and that the catback therefore would add nothing to a fully fit car. Or conversely that a catback would add 30bhp to any standard 6.0L VXR.

Bennno

[vixpy1]

Dan_S V8 said:

GSI_Daz said:

ringram said:

Just wondering if you had RW in text as its hard to get an accurate reading from the graph.

Headers = 336.7
Cat-back = 322.1
Std = Just under 300

I haven't got the figure for std, maybe biglump can add it?

Is that all? Guys in the USA are seeing on average 340rwhp from STANDARD LS2 GTO's. Something here doesn't add up...

With the difference between American and European dynos, that makes sense. You should typically add 10-15% to any MAHA/DD wheel fig to match a dynojet wheel fig. (the most popular dyno in the states).

Bear in mind, on the Dynojet, a standard golf gti mk5 (197bhp) will make 196 at the wheels.

[GSI_Daz]

bennno said:

GSI_Daz said:

OK, thanks to Michael (biglump) we now have figures for:

1) (Green line) Standard 6.0 VXR
2) (Pink Line) 6.0 VXR with Wortec cat-back
3) (Red Line) 6.0 VXR with Wortec full exhaust

All figures are RWHP.

Graph here

The standard 6.0 VXR showed just under 370FWHP which is well down on Vauxhall's claim. Cat-back was 399 and Full Exhaust 414.

Would be interesting to see a graph for a standard 5.7 VXR, anyone got one?

P.S. Good to meet you Michael, I had forgotten how quiet the std 6.0 was!

Edited by GSI_Daz on Friday 1st September 17:36

Why quote FWHP when you dont have this? Just quote RWHP when thats your results.

This still shows nothing categoric as that would require the same car to be dynoed, pre exhaust, post cat back fitment and post full system fitment.

Its quite possible from the stats that the first wasnt healthy and that the catback therefore would add nothing to a fully fit car. Or conversely that a catback would add 30bhp to any standard 6.0L VXR.

Bennno

I have FWHP which is calculated by the dyno, that is why I quoted it. On that argument there are very few people that could ever quote FWHP (only those that wish to rip out their engine and stick it on a bench). The FWHP was quoted to compare with what Vauxhall quote as standard. As I have never seen any RWHP quoted from Vauxhall then this is realistically the only way that it can be compared.

I agree that comparing the three results is not completely scientific, however, it gives a very good indication as to the gains. The difference between catback and full exhaust are as close as most people would get as it was on the same car with the same dyno/operator.

[bennno]

Ok so as results from same car can we assume that these results show categorically that replacement cats and headers (on top of Wortec cat back) add 14bhp?

Presume same day - with same temps, car done similar number of miles and same fuel?

We still cannot quantify the power upgrade from either catback or catback and rechip?

Bennno

[GSI_Daz]

bennno said:

Ok so as results from same car can we assume that these results show categorically that replacement cats and headers (on top of Wortec cat back) add 14bhp?

Presume same day - with same temps, car done similar number of miles and same fuel?

We still cannot quantify the power upgrade from either catback or catback and rechip?

Bennno

No, as you have said before I could not categorically state that these gains are completely accurate, however, for the cat-back to headers upgrade I have got as close to testing in similar conditions as possible.

1. Same Car
2. Similar miles (within 250 or so)
3. Same fuel (Although would have been a different batch)
4. Slightly different temps 22 vs 23

Also, if you look at B055's graphs they are very similar to my findings - within 1-2bhp all the way on both graphs. Without getting the scientists out in their labs then this is as close as we are going to get. Just remember that this is an INDICATION to the gains.

[BO55 VXR]

My figures differ ever so slightly from Daz's. It was still on a DD but at TMS, not SRR.



Headers = 339
Catback = 319

So I gained 20hp, not 14 but that could all be down to temps., fuel quality, tyres and operation.

Just for info, when Mose and myself were up at TMS for a VXR Rolling Road Shoot-out day, they overlayed both of our graphs onto the same print-out. This resulted in a single line (i.e. our cars were identical).

BTW: On Tuesday, I have a hub-dyno run so will post of comparison info based on rollers and hubs.

Edited by BO55 VXR on Sunday 3rd September 14:24

[Le Sarthe]

Have to say that correlates with what I saw (not my car but another well known black LS2!) that is Wortec catback with 100cell sport cats on defillipo headers and then wortecc headers which showed a 20hp difference (rear wheel I think Paul?)that was on dyno dynamics hub dyno I believe.

So GSIDAZ 14 hp diff seems to be in what would be an acceptable range bearing in mind one degree of timing pulled due to heat losses about 5 - 10 BHP as I understand it...

Edited by Le Sarthe on Sunday 3rd September 16:26

[GSI_Daz]

B055, never noticed how high your IT was before, seems pretty high?

[BO55 VXR]

GSI_Daz said:

B055, never noticed how high your IT was before, seems pretty high?

Yeah. it was pretty much straight onto the dyno when I got there - didn't get a chance to cool off