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01-07-09, 09:46 PM
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#11
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Member
Join Date: Jul 2007
Posts: 1,406
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Most of the standard 180s' I've seen figures for only make around 170lbft
Shroon
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"In the MG ZS, the relationship between car and driver borders on the intimate"
"The surprise is that the MG ZS feels right straight away and stays accurate and poised"
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01-07-09, 09:47 PM
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#12
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Member
Join Date: Jul 2007
Posts: 1,406
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Last time I was on the rollers [I] only made 170BHP with 177lbft lol
Shroon
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"In the MG ZS, the relationship between car and driver borders on the intimate"
"The surprise is that the MG ZS feels right straight away and stays accurate and poised"
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01-07-09, 09:50 PM
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#13
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Member
Join Date: Dec 2007
Location: Southampton
Posts: 3,078
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they throw up all sorts of figure's. if you were to put 10 zs 180's in a drag race id put my car on then all finishing very very closely. there wouldnt be anything noticable in it
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Astra GSi turbo
Regal Autosport Astra GSI Turbo 304 bhp 356 lb/ft
Thorney motorsport Vectra vxr 305bhp 398lbft
Now its time to build a big turbo MG ZS
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01-07-09, 09:52 PM
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#14
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Member
Join Date: Jul 2007
Posts: 1,406
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V true.
The tuner who did my roller test then took my car out to feel the flat area it showed on the rollers.
He said it went really well lol (she made 170 @ around 6,000 then no more lol)
Shroon
__________________
"In the MG ZS, the relationship between car and driver borders on the intimate"
"The surprise is that the MG ZS feels right straight away and stays accurate and poised"
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01-07-09, 10:00 PM
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#15
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Member
Join Date: Dec 2007
Location: Southampton
Posts: 3,078
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my 180 is roughly 16 bhp better than standard, puts out the same torque as standard. its very slightly quicker, but wont make a much of a difference in the real world, if any.
IMHO my mods have improved the acceleration a tiny amount bit but the noise level's a huge amount!!!
if your worried about how well your 180 goes, the best thing to do is to keep the plenum in good working order
__________________
Astra GSi turbo
Regal Autosport Astra GSI Turbo 304 bhp 356 lb/ft
Thorney motorsport Vectra vxr 305bhp 398lbft
Now its time to build a big turbo MG ZS
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01-07-09, 10:46 PM
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#16
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Site Owner
Join Date: Jul 2007
Location: Waterlooville, Hants
Posts: 24,098
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What I found strange was Ric's torque and power curve, not one I have seen before, very odd with blips all over the range. The torque curve being the one that baffled me. Without a doubt the whole plenum design/mechanism and vis valve build quality makes a huge difference to the final figures and delivery. There is no consistency here which makes it very difficult to set a benchmark.
Ric's plenum was replaced Sunday morning, this was brand new and came complete with brand new power and balance vis units, brand new throttle body, pots and IACV. However it showed a healthy jump in output from 177 but I was surprised that it was low to start with considering it had an ITG, decat and custom rear silencer. I would have expected to see at least 185-190 with the ecu 'learning' these mods as best it can. Mine started with 190 before topping at 200 after mapping.
This only underlines what I said earlier in that there is no consistency in the build quality and it always comes back to the plenum and vis system which dictates the torque figures and eventual power delivery. If the torque dips early and takes time to recover then this will have an effect on the final power figure before it tails off towards the redline area.
If the balance valve operation can be tweaked then I'm sure there is scope for improving the torque curve therefore ramping up the power albeit slightly. For those running standard cams I think we are chasing that last 5bhp and at the mercy of build quality. Those running cams will benefit from the longer duration and another 10-12bhp at slightly higher revs where most people wouldn't probably notice or even take their car.
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01-07-09, 10:51 PM
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#17
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Member
Join Date: Dec 2007
Location: Southampton
Posts: 3,078
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i personally think untill such time a new plenum is designed we are all going to see inconsistant power and torque figures. as mick underlines no plenum seems to be the same, they seem to have left the factory with inconsistant figures, and this seems to be showing on the rollers, and final in the figures after a re-map. untill a plenum is designed that will give a 180 a consistant power and torque figure this will always be an issue and a talking point. it also puts a big bold line under how bad the origional/standard plenum really is
__________________
Astra GSi turbo
Regal Autosport Astra GSI Turbo 304 bhp 356 lb/ft
Thorney motorsport Vectra vxr 305bhp 398lbft
Now its time to build a big turbo MG ZS
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01-07-09, 11:14 PM
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#18
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Member
Join Date: Jul 2007
Posts: 1,406
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Is the official ZS180 power graph
Shroon
__________________
"In the MG ZS, the relationship between car and driver borders on the intimate"
"The surprise is that the MG ZS feels right straight away and stays accurate and poised"
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01-07-09, 11:27 PM
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#19
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Member
Join Date: Dec 2007
Location: Southampton
Posts: 3,078
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do you have any more?? a more detailed one? maybe my plenum isnt so fooked as mine is very similar to that?? just with higher numbers
__________________
Astra GSi turbo
Regal Autosport Astra GSI Turbo 304 bhp 356 lb/ft
Thorney motorsport Vectra vxr 305bhp 398lbft
Now its time to build a big turbo MG ZS
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01-07-09, 11:41 PM
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#20
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Member
Join Date: Jul 2007
Posts: 1,406
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All the MGR graphs as OE
Shtroon
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"In the MG ZS, the relationship between car and driver borders on the intimate"
"The surprise is that the MG ZS feels right straight away and stays accurate and poised"
Last edited by shroonie29; 01-07-09 at 11:48 PM.
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