GolfGTIforum.co.uk
Model specific boards => Golf mk7 => Topic started by: Andrei Mattiuzi Balvedi on 06 November 2014, 18:51
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Hi everyone!
For about a year now, VW Brazil has imported the MK7 GTI from German; but from now on, it's gonna be imported from Mexico, until the new VW facilities here in Brazil start to produce the MK7, which is to happen late next year, I suppose.
Well, looking at the mexican VW site and at the GTI specifications, I realised that the power and torque are the same, BUT they come in a (very) higher engine speed compared to the german version. I mean:
German GTI: 220ps@4500rpm, 350N@1500rpm
Mexican GTI: 220ps@6200rpm, 350N@4200rpm
Why is that? No Valvelift in the second variant?
I would really like to know, because I'm quite sure VW will omit this irrelevant information...
Cheers
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To meet different markets emissions maybe?
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Seems very strange would be interesting to see a dyno, maybe emissions, may just be a Mexican typo :smiley: but it'll be the same hardware so a simple remap should yield the same results you'd hope
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I wonder if it's related to fuel specification? Although agree seems odd.....
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Someone told me that maybe they might have informed the max rev in the range where max power and torque are reached, and not the min rev :rolleyes: Possibly that. Wrong way to tell things, tough.
Anyway, US specs show normal GTI with 210hps and Performance Pack with 220hps :huh:
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I know there has been a lot of talk on the US forums about the lack of port injectors on certain US GTI engines......so I'd guess having 4 less injectors is probably the difference.
Ken
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i thought that was just emissions, a mapped us gti and a mapped uk gti are the same arent they?
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Could just be the RON91 petrol they get as standard low grade in the US, they have to tune the engine to run on that as a minimum?
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One of them must be wrong... because power is directly proportional to torque x revs...
So the same torque at different revs means the power must be different...
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they mightve got a good deal on some ex demo mk6 engines.... :grin:
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Maybe the answer: when the official VW mexican website says that the GTI has 220ps@6200rpms, they "forgot" to tell that the output is FROM 4500 TO 6200, and 350@4200 (4400, actually) means FROM 1500 TO 4400.
Two unsolved issues about the differences, yet:
- Mexican/American versions do have only 4 injectors (direct injectors), whereas German version has 8 (direct/indirect)?
- American version is supposed to have 210hps, and PP 220. Is that a real difference or only a matter of "metric", as there's a small difference between PS and HP?
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the difference in bhp and ps is negligible at these numbers, thats power difference will be as a result of crapper fuel states side, however i dont think that can be blamed for such difference of RPMs
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Andrei is most likely correct - MX/BR probably only quote power/torque at one rpm level whereas Germans give you the whole range where that power/torque is available.
It's possible that VW only use direct injection in the Americas and omit the port injectors (which were put in for emission reasons - think particulate emissions - as well as preventing the inlet valves from coking up), this will have only relatively small impact on overall power.
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The reason for 8 injectors vs 4 is that it allows you to have a flatter torque curve.
I forget which way round it is... injectors close to the head are good for low revs and further from the head high revs (or vice versa) and in the middle you phase from one to the other... this flattens the torque curve... we used to do this on my mate's rally car but we've realised that it is over complicated...
If the US variant has only 4 injectors this might explain why it has an apparently different torque curve but eventually develops the same power...
This is more than likely down to differences in emission regulations...
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http://forums.vwvortex.com/showthread.php?7052756-Where-s-The-Real-EA888-Engine-For-The-USA-MkVII-s&highlight=port
big issue on vortex so must be true
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I just took a look at my maintenance manual. The engine code of my german MK7 GTI 2015 is CHHB. That's supposed to be the same code of an european GTI. If I'm not wrong, german GTI Performance engine code is CHHA. As much as I know, when the difference stands only in the final letter, that means that THE ENGINES ARE STRICTLY THE SAME (HARDWARE), THE DIFFERENCE IS THE ENGINE MANAGEMENT (SOFTWARE).
That was the case with my now gone S3 8P: the engine code in Brazil was CDLC (256ps); at the time, the european S3 8P engine code was CDLA (265ps); the TTS was CDLB (272ps); Golf R was CDLD (270ps) in Europe, CDLC in US; and so on. Same engine, different softwares.
I know this is an UK forum, but anyway: do we have a mexican/american fellow here that could take a look at the maintenance manual/check the engine code, so we can clarify this out??
Cheers