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Tex’s Lotus Exige Cup 430 - Page 20 - V6 Exige Projects & Upgrades - The Lotus Forums #ForTheOwners Jump to content


Tex’s Lotus Exige Cup 430


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35 minutes ago, Tex said:

Hi Guy, it wasn’t actually but your solution looks good, have you got a contact for them ? and does it restrict or reduce power? 
 

What i remember seeing was a twin kinked tail pipe which can be adjusted to face down or sideways similar to the single Komotec dB eater.  I think the Komotec solution is not for the titanium exhaust I have though 

Mine was made for me by Maidstone Sports Cars as I couldn't find anything that suited what i was after.  It's effectively two Merlin Motorsport Racing Mufflers in a Y configuration.  Whilst I haven't put it on a dyno and done before and after, my dyno-arse certainly couldn't detect any difference.  Merlin supply them for use of loads of racing cars to get into practice sessions - they assured me they've never had any problems.  You can see through it - it's just catching the sound.  It's held in place with a bolt - we drilled a small hole in the bottom of the exhaust tip.

Done 3 track days with it without any problems at all.  I can't be arsed to change the exhaust so this suits me fine.

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Probably the best solution, although i prefer having the titanium exhaust wherever possible and would be forever switching them over which isn’t a quick task.  As I only need to drop 2 decibels to achieve what I need, the  dB eaters appear a better option

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Yeah I get that, I managed to get one second hand so for the cost it made sense as I’ll just get it switched over for a track day. 
 

it seems all other ideas involve drilling which I don’t like the sound of with a titanium exhaust. Plus they extend quite far which must put pressure on the welds given the speeds and bumps you can get on track as none of these extensions seem to be super light. 

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  • 2 weeks later...

I replaced my titanium exhaust with the Komo Tec
https://www.komo-tec.com/de/lotus-exige/mk3-toyota-v6350380/abgassystem/104/edelstahl-sportauspuff-exige-s-v6-evora-s-mit-klappensteuerung?c=884
We tested the Komotec exhaust on race tracks for a year, whether the flap is closed or open, there is no loss of performance. The flap can only be adjusted manually, so it does not open and close automatically.
The sound is wonderful, not too loud for the track when the flap is closed. Without loss of performance. brilliant

 

 

 

IMG_8337.jpg

Edited by Nightfire
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@Nightfire what was the weight difference?

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31 minutes ago, Nightfire said:

I replaced my titanium exhaust with the Komo Tec
https://www.komo-tec.com/de/lotus-exige/mk3-toyota-v6350380/abgassystem/104/edelstahl-sportauspuff-exige-s-v6-evora-s-mit-klappensteuerung?c=884
We tested the Komotec exhaust on race tracks for a year, whether the flap is closed or open, there is no loss of performance. The flap can only be adjusted manually, so it does not open and close automatically.
The sound is wonderful, not too loud for the track when the flap is closed. Without loss of performance. brilliant

 

 

 

IMG_8337.jpg

 Looks like you are running quite rich...any idea what your A/F ratios are?

Jack
2008 2-Eleven
2015 Exige V6 CupR
Track videos ... http://www.youtube.com/jackcup
2010 Lotus Challenge Series ULTRA Class champion
2012 Lotus CUP USA OPEN Class champion

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49 minutes ago, Nightfire said:

The sound is wonderful, not too loud for the track when the flap is closed. Without loss of performance. brilliant

Any engine temperature difference perhaps when the flap is closed ?

Edited by Martrack
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The throughput is large enough, no changes with the temperatures.

1 hour ago, Jack said:

 Looks like you are running quite rich...any idea what your A/F ratios are?

The picture is very dark, it looks exactly the same as with the titanium exhaust.

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10 hours ago, GazzyFizzle said:

I thought the flap automatically opened at certain revs, regardless of the switch position?

This is exactly the point where the exhaust valve no longer opens by itself but only manually. This ensures that it never gets too loud for the race track.

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Presumably the design of the exhaust Is materially very different from Lotus’s own system which has to open the valve at higher revs to reduce the potential of engine damage.

As it’s a KT system it must be ok but I would still feel uneasy at high revs on track having the valve closed 

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The Exige Cup 430 is rapid and well sorted as standard and you need to spend serious money to get up to the power and down to the low weight that it provides from other models. 

So  Is anyone doing any mods or contemplating any to improve on it’s track performance? 

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  • Bravo73 changed the title to Tex’s Lotus Exige Cup 430

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