Established 1973

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TDV6 RANGEROVER SPORT EXHAUST PROJECT.

DESIGN CRITERIA

1. Improved performance

2. Enhanced exhaust note(without causing unwanted excessive cabin noise)

3. Excellent build quality

4. Lifetime guarantee

5. Competitive pricing

VW Transporter

DEVELOPMENT

The first step in achieving our design criteria was to obtain a standard exhaust for examination. It quickly became apparent that the diameter of the original pipe work was ok and that the large centre bypass silencer was the main area of restriction in the exhaust(see pic 2) with the two smaller rear silencers being of a straight thru' free flowing design already. We decided to replace the bypass silencer with a straight thru' silencer which would greatly improve flow and also bring with it a much better exhaust note or so we thought!!! Having made up our first prototype it was time to check the results.

On test drive it was instantly noticeable that the engine felt much more responsive and lively throughout the rev range especially when pulling off from a standing start. This was exactly as expected from removing the bypass silencer and replacing it with a free flowing alternative. The surprising factor was the exhaust note had not changed at all and was still extremely muted. On returning to the workshop we decided to remove the rear silencers to see how this affected the exhaust note. We remanufactured some rear pipes without silencers and attached everything back on and set off for another test drive. The engine now sounded fantastic with the rear silencers removed the v6 engine sounded much more like it with a low rumble very reminiscent of a petrol v8.

Now that we were happy with the exhaust note as well as the increase in engine pick up we returned the car to John (customer) so that he could use it for a month to check there were no problems and confirm our feeling that the exhaust sounded great and also improved engine pick up. John's initial feedback after a week was promising, he reported the engine felt much more enthusiastic and sounded great his only worry was a slight drone from the exhaust at motorway cruising speed. We asked John to keep monitoring and come back to the workshop in a few more weeks so we could check on the exhaust which he duly did.

A short run on the motorway confirmed that the exhaust note was indeed a little bit too loud. We knew that two full size silencers would completely mute the exhaust so decided to manufacture some acoustic tailpipes (see pic 5) these are basically small silencers built into the tailpipes. Once fitted we sent John on his way to check the results. A few hours later we had a very happy John on the phone the acoustic tailpipes had worked banishing the drone at motorway speeds but still keeping that v6 rumble in normal driving conditions.

TDV6 FINAL SPECIFICATION

 

1.Manufactured entirely from 304grade stainless steel at are Macclesfield works.

2.Pipework is mandrel bent single 63.5mm od splitting into 2 x 50.8mm.

3.Main silencer is double skinned to prevent "stainless ring"

4.Acoustic tailpipes x 2 (2 sizes 3 1/2"round or 5"x3"oval)

Go to the following for order details:

td5alive

www.v8engines.com