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KomoTec EX430 or EX460 - Page 3 - Engine & Ancillaries/Gearbox - The Lotus Forums #ForTheOwners Jump to content


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2 hours ago, NW76 said:

Thanks Jack! By the way: is your Cup on the Oehlins Suspension? 

I will defintely come back to you, when I am in the Las Vegas area ... but its most likely going to be spring next year ;-) 

Cheers

Norbert

Yes, Ohlins TTX double adjustables.

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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Maybe make a trip over to komotec headquarters and see if you can test drive theirs.  There seems to be a fair few 430's kicking about and not read any horror stories. Komo tec do an uprated clut

I had a good look at the 1900cc charger at the festival and despite the obvious increase in size it didn't feel excessively heavy at all to pick up. I estimate it to be no more than 12kg so I wouldn't

I finally had a test drive in the KT EX460 yesterday. I am always very cautious when it comes to believing power figures some tuners publish, as it is relatively easy to get a nice power chart on a Dy

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7 hours ago, French Frie said:

is there already a plug in the manifold to put the temperature sender, or did you have to drill & tape a hole ? as it seems a crucial info, is there any good reason that Lotus don't bother to gather this info, rather than guestimating it and retarding advance accordingly :popo: ?  it always astonish me that Lotus make some cuts about what you're supposed to find on a sportcar, i.e. oil temperature, oil pressure, gearbox rad on some models, etc ...

When I have a look at my instruments cluster on my Exige (where the gear display even "eats" water temp !), I cry and I can't only think it won't be expensive to add a second display under the right dial and add some infos (if it can be read when sun shines B-)) !  I do know that we are accustomed to a kind of sobriety with our cars, but something like the Evora 400 display (and some dynamic changes to display oil temp/pressure) wouldn't bother me ...

@French Frie -- No pre-existing plug, the shop had to tap the manifold.

It cost me a good amount of $$ just to have an instrument cluster where I can read what the water temp is while on track w/o straining my eyes. ;) While I was at it, I thought adding some sensors to give me more info regarding other important engine parameters would be nice.  Also, having the ability to custom set alarms which one can see easily and that are prominently displayed is a big bonus. Couple the dash with a camera which can capture data and display it on the video also helps keep you informed about your car's performance at an easy glance after the session. :)  

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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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18 minutes ago, NW76 said:

Are you happy with it and would you recommend it also for 50/50 road and track use?

Norbert, the Ohlin TTX shocks are great coil overs but are pricey.  I have also tried Nitron 46mm triples on my 2-11, which came with Ohlin doubles standard from the factory.  Nitron makes a good shock and it's a great value.  Are they as good as Ohlins?……maybe not??

I'm pretty sure that the Ohlins could provide you with a comfortable driving experience on the road with the proper spring rates and selecting the correct shock settings for that use. I know you would love the setup on track. :thumbup:

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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that will be a hard decision... the Nitron 3-way for the Exige are very reasonable price wise (1/2 price of the Oehlins TTX)... but I do not know anybody who has installed them on the Exige V6 so far... 

The EX460 from KT has the Oehlins ... so we will see...

Thanks for your feedback ;-)

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If I lived in Germany with convenient access to KT, I'd be broke….. as I'm a "modaholic".  :devil:

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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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2 hours ago, NW76 said:

The EX460 from KT has the Oehlins ... so we will see...

K T uses road&track, this is fare another class than the one Jack drives in his Cup. If or when I am going to order my Cup, I will definately go for the Ohlins.

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2 hours ago, Freejack said:

K T uses road&track, this is fare another class than the one Jack drives in his Cup. If or when I am going to order my Cup, I will definately go for the Ohlins.

You are right... its the 1-way Oehlins Road and Track... I would much rather want to test the Oehlins 2-way TTX ... or the Nitron 3-Way... we will see ;-)

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thanks for the detailed feedback :P ... it seems to be very tempting, but as you said, it is a massive improvement on an already fast car ! did you have the opportunity to also test the EX430 ? 

 

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Very good feedback!

I would love to see the system they use in the 3-11 Race (460bhp) or the newer Evora 410, as they use a different charger, but not sure on the cooling side. Least the engine is more than capaple with the power though! Without shed loads more torque, the box and clutch should last a decent while. 

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1 hour ago, The Pits said:

I have witnessed first hand what happens to a kt430 Exige on a hot track day and I can tell you that it doesn't make anywhere near 430ps for long. The SSC kit appeals to me more at this time.

I am absolutely sure, that Norbert was really impressed by the car because of power and gear ratio, but without any comparision, it's hard to judge correctly.

The physics are quiet clear: Where you compress air, you create heat which works against the efficency. All my Porsche friends with turbo charged engines are spending a hell of money for charge cooler, because power during night or for just 2 laps is nothing we wish to have. 

1900cc charger with stabile > 410+ hp seems to me as well a good way to go.

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6 hours ago, French Frie said:

thanks for the detailed feedback :P ... it seems to be very tempting, but as you said, it is a massive improvement on an already fast car ! did you have the opportunity to also test the EX430 ? 

 

No - I only had limited time and the EX430 kit for me, after the discussion in this thread, is not really an option I seriously still consider. 

4 hours ago, The Pits said:

I have witnessed first hand what happens to a kt430 Exige on a hot track day and I can tell you that it doesn't make anywhere near 430ps for long. The SSC kit appeals to me more at this time.

I think Jonny is absolutely right with the above ... at temps above 30C the 430 kit will experience a significant drop in power... on the EX460 with the Charge Cooler though, I believe the KT rational and data, and it should be much more stable. It certainly was at 22C when I test drove the car - of course with the caveat that  this was on Road and not on Track... 

2 hours ago, Freejack said:

I am absolutely sure, that Norbert was really impressed by the car because of power and gear ratio, but without any comparision, it's hard to judge correctly.

The shorter gear ratio really kicks in, in gear 4,5 and 6 ... so you are right ... its hard for me to tell in those gears, how much of the subjective power gain is from the power itself and how much is the shorter gear ratio ... 1,2 and 3 are realtively close to standard (I would say within less than 10 kmh w/o having the exact figures) and there it was easier to tell ... the power gain is significant enough for me that in the end I do not even worry anymore how much of it is gear ratio and how much is power ;-)

The SSC kit looks very interesting for me as well... but w/o a proper distributer and Lotus specialist installing and adjusting its just too much of a game for me... 

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12 minutes ago, NW76 said:

The shorter gear ratio really kicks in, in gear 4,5 and 6 ... so you are right ...

I know about what I am talking, because I had shorter gear ratio in my Porsche. You can calculate by ratio and % how much more wheel torque you're getting by this.

But, ........ more power and shorter gear ratio seems to be better choice ;)

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Nice to see some healthy rivalry for Komotec, like many here we are all waiting to see what the factory's next move is with the Exige. More power is almost certain but whether or not it will be chargecooled is not known at this time. I do know from speaking to very knowledgable people on this that the gearbox is not up to a significant increase in torque, hence why the factory torque limit the E400. I was hoping the lighter 311 would mean Lotus could release more for the road car version but that is still not the case. It still has a gearbox capable of running over 100k miles. That seems a bit over-engineered for the expected mileages for the cars but there you go. However it's looking very likely already that the next Exige will also be torque limited which means anyone wanting a seriously fast Exige will need to look to Komotec or SSC (Hoffmans in the UK). I also know there is a possible route via the race teams which involves a new ecu. Swindon race engines ran up to 500bhp without an intercooler and instead mapped the car to run at high temperatures.

https://www.motorsportauctions.com/index.php?a=ap&addon=storefront&page=home&store=710&listing=35479

The dream engine for me is still the 400bhp n/a Cosworth developed V6 as the whole package would be lighter too. Not a cheap option naturally!

https://www.motorsportauctions.com/index.php?a=ap&addon=storefront&page=home&store=710&listing=33870

But if the new Exige is not chargecooled and just a fudge with a smaller pulley a KT or SSC option looks very tempting. If it was me I'd go straight for the chargecooled KT option and would probably go for the SSC over the 430 kit.

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I may be crazy, but I think a normally-aspirated V6 with headers (of course no cats), swindon cams and a proper intake making 330 rear wheel horse power would be fantastic.  Lighter and not prone to high IATs for consistent power delivery -- that's the ticket,   Oh wait, it's being done right now in the Colonies on an Evora GTN. :) 

Let's dump those superchargers. :D 

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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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The close ratio is a change of final drive for 5th & 6th gear (EA60 has two final drive ratios - one for 1st-4th and one for 5th-6th).

So the upgrade closes the gap between 4th and 5th, as well as giving a bit more acceleration in the top two gears.

Dave

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I believe the figure for the Evora and 311 is something like 40kg. Quite a lot of plumbing and fluids involved. I'm not quite sure I get the point of going to all that trouble for 5lbs/ft more. Easier to beef-up the gearbox surely? But it does suggest that the 1300cc charger was running hard even at 350ps. So 430ps is definitely pushing it!

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