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Plug Whisperer
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Discussion Starter #1
As many know, we part of the development team of the exciting new Charge Cooled Blower Kit coming out for the Evora/Evora S/Evora400/Exige V6, etc...

We have 3 Evoras of our own; all started as NA. 2 IPS cars and 1 manual car from various years.

We've made as much as 420whp on an unopened motor with 91 octane fuel. There's a lot left and that's not really the point of the post... the next trick is getting the power to the ground!

The IPS has been the trickier of the two platforms, which is no surprise...

Perhaps needless to say, the stock IPS lacks a bit. In an effort to fortify the IPS sufficiently to hold these larger power levels, we've tapped all the easy buttons such as borrowing Lotus's TCU programming from SC'd IPS cars, adding shift kits on the market and even purchasing a "performance valvebody" from a known aftermarket Lotus supplier. The easy buttons yielded fruitless outcomes.

The performance valve body was nothing more than a rebuilt used unit with a Sonnax O-ringing rebuild kit. Zero improvement with the "performance VB" Boo:/

The aftermarket players in shiftkit land simply haven't had a need to develop a great kit (not many camry and Lexus RX350s pushing the envelop! lol) so the only offerings out there from the obvious players were to remedy worn transmissions, but not really to make the box handle 500hp...

The good news is that we've successfully assembled a shiftkit cocktail of a handful of parts (put into the right places) that have vastly increased the gear holding ability of the IPS. We've implemented additional gauges to monitor internal transmission line pressure, shift times, etc and have made great progress. At this time, I can say the IPS is finally holding THE power!

We're still settling on the final kit assembly to get the best balance within the trans, but we have enough time on the trans to know we're very close. The plan is to include this bespoke "shift kit" to go with the blower kits destined for IPS cars and probably offer as a standalone shift-kit for other IPS cars as well . To be clear, this isn't a trans rebuild. It's a: drop the pan, drop the valvebody and install the kit in the VB, reverse steps... We're already working on some detailed photos to make this "idiot proof".

Just sharing some more progress on this massive "Make the Evora Great" project :D

Cheers,

Phil
 

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Auto Evora 4*0 seem to be much better rated than the earlier S1 IPS cars. Owners / road testers feel that Lotus got a good balance between response Vs smoothness on the more recent cars & overall not far off a good double clutch gearbox.

I've not driven a later car personally, but felt the auto S1 Evora & V6 Exiges that I have driven didn't provide the response you'd expect from a sports car. But they were OK in day to day driving, especially in heavy traffic.

As far as I know Lotus didn't make any hardware changes to the gearbox to achieve these improvements (probably weren't allowed to by Toyota), the revised TCU / ECU mapping did the trick.

As BOE are well know for Lotus ECU software, whats your view ?
 

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Lotus Evora Specialty
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Nice to see the IPS cars getting some love! Sounds like you've got a solution but forgive me for asking.. what is the problem? I don't understand what "hold these larger power levels" mean?

(I hope this isn't taken as a bait. Our company and BOE don't really compete, as our products are focused on two different segments of ownership. My personal car is an IPS and I'm just happy to see that someone is putting some R&D into the transmission.)
 

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Plug Whisperer
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Discussion Starter #5
Just updating and addressing the questions...

We got the limits of what the software would remedy to hold 400whp on the IPS car. Good news is that we're holding that now. By "holding it", I mean the motor was making enough power that the IPS trans was slipping. We were careful to let it burn, but it was no longer able to execute a shift with the power we're making. While we're still making some final tweaks to the trans recipe, we have a working formula at this point and we're putting more miles on the IPS cars every day with the big/new blower...

Cheers,

Phil
 

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Plug Whisperer
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Discussion Starter #6
We've now reduced the IPS shift speeds to 0.3 seconds and that's even on the notoriously bad 3-4 shift, as we have it down to 0.2 seconds:cool: That seems to be the mechanical limit for the trans. It holds the new power with no slippage whatsoever....

"Great Success!"

Cheers,

Phil
 

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We've now reduced the IPS shift speeds to 0.3 seconds and that's even on the notoriously bad 3-4 shift, as we have it down to 0.2 seconds<img src="https://www.lotustalk.com/forums/images/smilies/cool.gif" border="0" alt="" title="Cool" class="inlineimg" /> That seems to be the mechanical limit for the trans. It holds the new power with no slippage whatsoever....

"Great Success!"

Cheers,

Phil
That is amazing! How hard is it to get in on this upgrade?
 

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Plug Whisperer
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Discussion Starter #9
That is amazing! How hard is it to get in on this upgrade?
Thanks.

The TCU (the trans computer) still buffers the shift request to the trans a bit when in manual mode at WOT. What we've done is optimize the hydraulics in the trans itself to make a massive improvement in shift speed and power holding ability. Installation isn't terrible. It requires dropping the valvebody out of the trans, but no special tools. I anticipate, all else equal, the trans will stand up better to track abuse with this modification since internal slippage is all be eliminated and autos HATE internal slippage.


I hope to have better information on price and availability later next week. :shift: The aim is to offer the kit as a standalone kit but it will come as part of the IPS version of the new supercharger system we're releasing soon.

Cheers,

Phil
 

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Thanks.

The TCU (the trans computer) still buffers the shift request to the trans a bit when in manual mode at WOT. What we've done is optimize the hydraulics in the trans itself to make a massive improvement in shift speed and power holding ability. Installation isn't terrible. It requires dropping the valvebody out of the trans, but no special tools. I anticipate, all else equal, the trans will stand up better to track abuse with this modification since internal slippage is all be eliminated and autos HATE internal slippage.


I hope to have better information on price and availability later next week. :shift: The aim is to offer the kit as a standalone kit but it will come as part of the IPS version of the new supercharger system we're releasing soon.

Cheers,

Phil
That is pretty awesome news. Excited to see where this goes.
 

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6.94915254 lbs/hp
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Which is why I stay away from anything aftermarket that involves complicated re-engineering of major components or electronics (engine tunes for example), unless it's with a company that works with a major manufacturer (say Mountune), or has real independent engineering cred (say Cosworth).

I genuinely don't see how small shops staffed by people who are not engineers can do the rigorous testing required for these kinds of mods.

I am, of course, happy to be told why I am wrong!

I should add that my question here is a genuine one about the automotive aftermarket in general and not BOE in particular. I realize that BOE has many happy customers on LT (including me!).
Ummm then don't buy any aftermarket parts if this worries you and ignore these threads! :shrug:

There are plenty of places to get the OE parts if you feel safer with them... Its not like Lotus ever cuts corner or makes mistakes... Like the quality tested and engineered OE radiators (with plastic end tanks), OE toe links, OE steering racks, OE coilover designs, etc... :rolleyes:
 

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Ummm then don't buy any aftermarket parts if this worries you and ignore these threads! :shrug:

There are plenty of places to get the OE parts if you feel safer with them... Its not like Lotus ever cuts corner or makes mistakes... Like the quality tested and engineered OE radiators (with plastic end tanks), OE toe links, OE steering racks, OE coilover designs, etc... :rolleyes:
You’re in the wrong model forum. If you want to play here you have to reference OE master cylinders or OE trunk latches. :wink2:
 

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6.94915254 lbs/hp
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You’re in the wrong model forum. If you want to play here you have to reference OE master cylinders or OE trunk latches. :wink2:
Yeah I was too lazy to look up the known Evora weak points! ...I went after the low hanging fruit... Thanks for the help though!
 

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I have few questions about this upgrade:
If I've understood well, it is an hardware update, not sure a SW update as well. Am I right? if there is a SW update as well, it will be possible to do by the owner?
the 400 has a different SW but the HW should be the same. could anybody confirm?
do you think that it will be expensive??

thank you and please do not go off topic
 

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Plug Whisperer
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6,305 Posts
Discussion Starter #15
I have few questions about this upgrade:
If I've understood well, it is an hardware update, not sure a SW update as well. Am I right? if there is a SW update as well, it will be possible to do by the owner?
the 400 has a different SW but the HW should be the same. could anybody confirm?
do you think that it will be expensive??

thank you and please do not go off topic
That's correct-- It's a hardware update. I've toyed with the various TCU files in the trans and couldn't get the results I was looking for, so we went to hardware. If I ever do a TCU software update, the aim would be to DIY at home. All my Evora tunes are DIY at home with your laptop... To be clear though, no TCU hackery is in process. Hands are full^10 at the moment.

On the 400, I can't comment for sure if there was anything hardware changed in the trans.

"Expensive"... not sure what that is... It's a relative term, I figure. Last I checked on the interwebs, there's barely a 1,000 IPS S1 Evoras (NA and S combined) on the planet... so it has to be priced to make the work a viable exercise... I'm sure we can all appreciate that! Will it be a grand? I can't see that. Something south of that I would guess. We're assembling a production run proforma of the bits and pieces now to see what our hard-part costs will be. There are two parts we machine modify in house and will work an exchange/core on those--- the rest of the parts are what i would call lathe parts and springs. A good bit of transmission wizardry...

Cheers,

Phil
 

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Acme Super Moderator ** The Enforcer **
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Phil will do all the glamorous work, the work behind the scenes and is then humble enough to take out the trash on his way home. A class act.

San
 

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That's correct-- It's a hardware update. I've toyed with the various TCU files in the trans and couldn't get the results I was looking for, so we went to hardware. If I ever do a TCU software update, the aim would be to DIY at home. All my Evora tunes are DIY at home with your laptop... To be clear though, no TCU hackery is in process. Hands are full^10 at the moment.

On the 400, I can't comment for sure if there was anything hardware changed in the trans.

"Expensive"... not sure what that is... It's a relative term, I figure. Last I checked on the interwebs, there's barely a 1,000 IPS S1 Evoras (NA and S combined) on the planet... so it has to be priced to make the work a viable exercise... I'm sure we can all appreciate that! Will it be a grand? I can't see that. Something south of that I would guess. We're assembling a production run proforma of the bits and pieces now to see what our hard-part costs will be. There are two parts we machine modify in house and will work an exchange/core on those--- the rest of the parts are what i would call lathe parts and springs. A good bit of transmission wizardry...

Cheers,

Phil
Have you considered expanding the offering to other cars that use the same tranny (aka Toyota)?

Just thinking how you could up the volumes and make it a more viable endeavor than only selling to the pool of 1,000 IPS Evoras.
 

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Plug Whisperer
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Discussion Starter #18
Have you considered expanding the offering to other cars that use the same tranny (aka Toyota)?

Just thinking how you could up the volumes and make it a more viable endeavor than only selling to the pool of 1,000 IPS Evoras.
We have and there may be something there.... problem is the list of users isn't normally all that concerned with shift quickness.... maybe I'll surprised :eek:

2006 - 2008 Toyota Estima (GSR50) 3.5L
2007– Toyota Camry (V6)
2007– Lexus ES 350
2007– Toyota Aurion (V6)
2007– Toyota Blade (V6)
2007– Toyota Mark X Zio (V6)
2008- Toyota Avalon
2009- Toyota Venza
2010– Lexus RX350
2011- Toyota Sienna
2012- Lotus Evora ("IPS")

Thanks!

Phil
 

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Plug Whisperer
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