Syncro on the rolling road

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Syncro on the rolling road

Postby fh9977 » 17 Feb 2020, 11:55

Hello!
I booked to take my Syncro for a power run on Sat 29/02. Van has the AAZ engine with upgraded turbo, boost ping and an intercooler. It also has a decoupler installed.

The shop (Revilvals, in Royston) has 2WD and 4WD rollers.

Any suggestions or recommendations for the power run?

I am booked for 10:30am in case anyone wants to come around and see how it goes.

Thanks,
Fabio



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Re: Syncro on the rolling road

Postby silverbullet » 17 Feb 2020, 15:51

Give it an oil and filter change a few days before and make sure that all oil and coolant hoses (and their connections) are sound.
Then drive it around to make sure oil pressure is still good.

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Re: Syncro on the rolling road

Postby fh9977 » 03 Mar 2020, 13:44

Power run went quite well on Saturday, these are the results.

How would that compare with a TDI?

For an AAZ 82 BHP isn't bad.
Nice torque curve as well quite smooth.

But drag of tyres (BFGs 235/75/R15) is quite high. Torque at wheels 30 BHP. Can this be any better if I get smaller tyres, make a noticeable difference when driving? Image

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Re: Syncro on the rolling road

Postby silverbullet » 03 Mar 2020, 18:31

If you fit tyres of stock rolling radius (equivalent to 205/70/14) it will reduce the overall gearing. Van will accelerate better but revs will rise a little in all gears, about 8-10% compared to your AT's.
A less aggressive tread will reduce rolling friction, so less losses there. This might improve fuel consumption but it may be balanced out by the higher revs due to lower gearing...

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Re: Syncro on the rolling road

Postby silverbullet » 03 Mar 2020, 18:39

PS engine peaks at around 3300rpm? That doesn't look great, I would have expected it to hang on until 4k before dropping off.
But you have consistent 2 bar boost, which suggests that the inlet air temperatures are rocketing and charge density is poor.

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Re: Syncro on the rolling road

Postby silverbullet » 04 Mar 2020, 14:01

Just a thought: which gear did you use for the power run? 3rd is closest to 1:1 ratio so should incur the lowest losses.
4th is overdriven anywhere from 0.82 to 0.7 :O depending on what has been fitted, this could be where some of your bhp went...
Pumping up the tyres to maximum pressure is also usually the done thing, the rolling road should have advised you of this.

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