Power loss

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MarkMcQ
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Power loss

Post by MarkMcQ » Wed Nov 20, 2019 11:33 am

So I’m looking for a bit of advice. I bought my caddy maxi in the summer. It’s been slightly modified in the fact that it’s had Zito wheels put on it and V Maxx lowered suspension. It’s the 102hp by the way. There is nothing when you put your foot down. Fuel consumption in poop, averaging 40mpg. VW have had it for a few days running tests on it and they say it is down to the wheels!! So they are saying I’ve lost 18-20 mpg because of the wheels being bigger! Anyone had any experience of fuel consumption loss due to lowering and wheel change?? Thanks in advance

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the swan fiend
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Engine size/power: 1.6 CR TDI (102bhp)

Re: Power loss

Post by the swan fiend » Wed Nov 20, 2019 12:56 pm

I’m not buying that mate. Going up a few inches (say to 18”, with a wider rim) will worsen consumption slightly, but I’d say the difference would be negligible.
Has it had the emissions update done?


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MarkMcQ
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Re: Power loss

Post by MarkMcQ » Wed Nov 20, 2019 2:38 pm

They didn’t say exactly what tests they’d carried out! I asked if they’d checked dpf and they said they’d checked from “engine side”! To my knowledge, the dpf is after the engine and would therefore need an emissions test at the exhaust pipe. I’m the same as you are. No way could I lose that much fuel considering it’s all motorway!! I let the cruise control do the acceleration and there’s is no gear change for 165 miles!!

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Skully
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Re: Power loss

Post by Skully » Wed Nov 20, 2019 3:13 pm

They are talking absolute crap.
There is NO way that 18 inch wheels will cause any of that.
In fact..... the 18 inch wheels make the speedo more accurate so will actually improve the fuel consumption on the display.
Example - when I got my Caddy it had 16 inch wheels on and at a true 120kmh on GPS the speedo would show 130kmh.
Now with the 18 inch wheels at a true 120 on GPS, it shows 122kmh.

More accurate speedo equals more accurate fuel consumption calculations from the dash.

There is some other issue that they have either not seen or they are just useless.
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MarkMcQ
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Re: Power loss

Post by MarkMcQ » Wed Nov 20, 2019 7:18 pm

It’s got 19 inch zito ZF01 wheels but what they tried to tell me was I had put oversized wheels on. After trying to explain that the rims were bigger but the tyre depth less and if placed next to a normal caddy wheel (15” plus tyre) then they would match. Only difference being the width of the tyre across the tread. He got it in the end but struggled. To get the fuel calculations right I brimmed the tank 3 times. Each time refilling to see what the litre/gallon consumption was. First tank, 41mpg. Second tank, 42mpg. Third tank, 40mpg. I know there’s something wrong as they gave me a swb caddy with same engine and gearbox and it knocked spots off mine!!

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the swan fiend
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Re: Power loss

Post by the swan fiend » Wed Nov 20, 2019 7:39 pm

I’d take it somewhere else mate.


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Doc
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Re: Power loss

Post by Doc » Wed Nov 20, 2019 7:41 pm

Just out of curiosity as I know these things affect MPG.
What tyre pressures are you running?
Have you had alignment/tracking checked?
When was your engine last serviced?
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MarkMcQ
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Re: Power loss

Post by MarkMcQ » Wed Nov 20, 2019 7:57 pm

I'd have to check tyre pressures. engine was serviced at 19,000. 2 weeks prior to having the tests done as I didn't want anything to flag up as a clogged filter or the like. I bought the van with 16k on it and it has been the same since I got it. I spoke to the dealer I bought it off and asked him did he just put shocks on and then throw the wheels and tyres on? He said he had them properly fitted and aligned. I'm thinking just take it somewhere else. to me I don't think they've tested the DPF right. I could be wrong but they say that they tested everything "from the engine side, and this would include emissions"!

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Giddy
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Re: Power loss

Post by Giddy » Wed Nov 20, 2019 8:11 pm

Is this Caddy4 2.0 tdi or older 1.6 tdi?
Caddy 4, Highline, 1.4 TSI
Build thread https://www.caddy2k.com/forum/viewtopic ... 13&t=37368

MarkMcQ
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Re: Power loss

Post by MarkMcQ » Wed Nov 20, 2019 8:15 pm

VW caddy Maxi Highline 2.0tdi C20 EU6 BMT 2018 (68 plate)

Stedlocks
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Re: Power loss

Post by Stedlocks » Wed Nov 20, 2019 11:38 pm

have you checked for the emissions update?

MarkMcQ
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Re: Power loss

Post by MarkMcQ » Thu Nov 21, 2019 6:53 am

I would have hoped that when in went in to VW they would have checked for updates and recalls! Is it something I can check myself?

MarkMcQ
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Re: Power loss

Post by MarkMcQ » Thu Nov 21, 2019 7:25 am

Just checked. Mine is NOT affected by any emissions problems, updates.

dipstr
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Re: Power loss

Post by dipstr » Thu Nov 21, 2019 7:18 pm

Is it dsg or manual box

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MarkMcQ
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Re: Power loss

Post by MarkMcQ » Thu Nov 21, 2019 7:57 pm

Manual

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