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Discussion Starter · #1 ·
For fun and general information I thought it would be useful to have a single thread where owners can post their 4th gear 30-50mph acceleration times. (I hope similar threads have not been started before)

I've done similar tests before on previous cars and found the results interesting when considering the effectiveness of modifications like remapping, cylinder head porting, air filters etc.

Repeat the timed test on a level road and ideally in both directions. Even with a hand stop watch I've found the result repeatable to 0.1-0.2s.

If this thread takes off it would be useful for owners to post before and after modification results. The more information about your car you share the better. I'll happily turn the posts in to a table for all to view.

This isn't about bragging rights but simply sharing information which may be helpful when owners consider modifying their car.

My standard diesel car is being serviced next week, so I'll do the test myself after then.

Typical information worth including: Engine, mileage, no. of passengers, wheel size, modifications, average 30-50mph time, plus what ever you want to share.
 

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What about varying degree of clutch slip? ;)

All seriousness, good idea, but lots of specifics will have to be included including wind direction/ road surface/ weather/ slip streaming etc...
 

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Discussion Starter · #3 · (Edited)
I take your point, but if the test remains simple then more people should be willing to step forward and do this quick, easy and safe test. :)

Repeating the test in the other direction removes the significant factors like road gradient and wind speed.

This thread was kind of in response to the 0-62mph thread, in which I feel there are too many driver and environmental factors that make the test unreliable. A single gear, mid range acceleration test should be better I feel.
 

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Discussion Starter · #6 ·
There are few if any roads where it's safe or legal to do a 30-70mph test.

I'll consider 30-60mph in 4th if that's is more popular.

Remember this test is not about giving definitive performance, as a whole range of tests would be required for that, which very few members would bother to do, but to give a benchmark status for a car with or without modifications.

This wiki page (Theoretical Performance Calculation - Civinfo Wiki) suggests times will be 4-8s, which with a 0.2s margin of error should be sufficient as a reliable test.
 

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Cockup Specialist
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30-70 in 3rd gear.

was 6s with TDI map
about 5.3s with celtic stage 3
6.8s oem with modded airbox and fmic
7.6s oem

Then there is the gradient issue whicj is the major stumbling block.
Need to do exactly the same piece of tarmac in both directions and then average ;)

Most FN2 will be in the 7s range I think.
Higly tuned NA FN2s about 6s.
 

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Discussion Starter · #9 ·
This morning on a motorway slip road I accelerated from 30-50mph in 4th gear. Whilst I agree it is rather short, I would like to stick with this measure as it is an industry standard often quoted in road tests, so would enable interesting comparisons to other vehicles.

Let's see how it goes :)
 

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30-70 in 3rd gear.

was 6s with TDI map
about 5.3s with celtic stage 3
6.8s oem with modded airbox and fmic
7.6s oem

Then there is the gradient issue whicj is the major stumbling block.
Need to do exactly the same piece of tarmac in both directions and then average ;)

Most FN2 will be in the 7s range I think.
Higly tuned NA FN2s about 6s.
As above, 30 - 70 is a better indication imo

20mph is too small a sample to be of any use, its like a brief throttle jab!
 
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