BOE Evora CAI

[Julian73]

Hints of better things to come for Evora and Evora S owners. BOE has produced me a great Cold Air Intake system for the Evora S and is modifing to the NA version of the car.

2.5% power and torque gains at 6450 rpm, gains start at 5600 and grow to Redline, no losses along curve, stable air flow ratios. System cuts weight out of tail and offers true cold air draw direct from body scope as per OEM and offers easier access and maintenance of filter element.

Quote from Phil at BOE:"Feeling very good about the car. It drives nice. Throttle response is very crisp and it's VERY eager to rev on tip in!"

Power plots
i) White curve - Komo-Tec Header, Komo-Tec 200 cell Cat, BOE Kold-fire custom tune
ii) Blue curve - (i) + BOE CAI

[XHILR8N!]

Don't do this! I've sworn "No mods!"

And please don't make her sound better!

[Julian73]

Its just a little mod, in the spirit of Colin himself.

[Allan Gibbs]

2% is about 5hp for the n/a and about 7 for the S. I assume that 2% wrhp?

Did Phil say when it's going to be available? Also, if I have the EV300 tune, would I need an update for the CAI?

[Plackslayer]

Congrats on getting it done.

[Julian73]

Originally Posted by Allan Gibbs

2% is about 5hp for the n/a and about 7 for the S. I assume that 2% wrhp?

Did Phil say when it's going to be available? Also, if I have the EV300 tune, would I need an update for the CAI?

I got extra 8 rwHp and 6.5 ft-lbs torque at 6500 rpm . Need to talk to Phil at BOE Fabrication about availability and if tuning mods are needed or not; mine was tuned.

[Julian73]

Originally Posted by Plackslayer

Congrats on getting it done.

The car went in for one thing, but weather delayed road testing the car aftter that work was done and delayed my ability to drive it home, so what else was I to do.. no need for the car to sit in a corner of Phil and Andrews shop collecting dust.

[Plackslayer]

Originally Posted by Julian73

The car went in for one thing, but weather delayed road testing the car aftter that work was done and delayed my ability to drive it home, so what else was I to do.. no need for the car to sit in a corner of Phil and Andrews shop collecting dust.

If you were taking your car back, I was going to donate mine for the dev time

[invictusmaneo]

paying close attention. really hope that it is compatible pre and post tune, and that the sound is better. Looks good

[turbophil]

Hi guys,

Not quite ready for primetime, but shouldn't be far...

The goal here was to create an intake that doesn't need tuning (works with stock Lotus tunes and aftermarket tunes), retains the direct "ram air" effect from the body duct on the car, add a little potential for power, make service easier, drop some weight, and make for a better audible note from the intake path. I think we did that with this setup


Couple notes that make it different from current offerings:

1) Lotus did a nice job of giving us a hole in the body work that was designed for feeding outside air to the intake. We retained use of this and have aircraft ducting going from the bodywork air intake scoop to the new filter box. There is no need for a new heat barrier or wall to be inserted in the engine bay.

2) The filter is foam and enclosed in an intake "box", rather than cloth weave in the open engine bay. This has several benefits. Foam breathes better for longer, filters better, and the enclosed box helps to introduce air uniformly to the filter aiding in laminar flow to the MAF sensor, while protecting the filter from damage. It also allows for a tiny bit of that ram air effect (albeit, surely not much)...

3) MAF housing design is much different and is designed to work with stock Lotus programming. We've tested another design out there that wasn't designed with adequate attention to how sensitive this MAF sensor is to air flow. The stock box has no air straightener, the air enters the MAF tube while taking a 90 degree turn, there's a diffuser on the box, etc... bottom line, it' not a simple task to recreate this path to achieve the *needed* MAF values to ensure the car will run correctly at all throttle openings and load levels. If the MAF value is manipulated too far down (such as the case with another aftermarket intake), the engine will be throwing artificially high timing and lower amounts of fuel at the motor. Great for making power in the absence of safety and control of the ECU, but that's surely not the correct way to get power...

This MAF flow design oversight has been a particularly large issue when combined with all cars and tuning, IPS cars, and S cars. There are also issues with "lazy throttle tip-in" and lack of "crispness" in the driving experience. When designing Julian's setup, we built several MAF tubes of various diameters for the car with different internal air "aids" within those tubes to finally get the right combination that produced the correct MAF response in all load sites in the map, made the right power, has exceptionally eager throttle tip-in, etc. It sounds SOOOO awesome as well. The air scoop is just behind the driver's side window on the body work, and OMG, it sounds cool!

Cheers,

Phil

[lynnpreston]

Phil, you are an evil man intent on separating me from my hard earned money

Do you guys plan to customize the EV290 tune for this intake. Just curious if there is even more to be gained that way.

While I wait for your answer I will be feverishly refreshing your site's product page . . .


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[turbophil]

I'm surely tipping my hand with this information, but here's some data...

I've reduced the data stream to only show pertinent data to the intakes. Notice the cursor tag at approx 6,000 RPMs. Notice the MAF values.MAF values at reference RPM are the primary drivers for spark and fuel input. Here, you can see typical stock MAF values at 6,000 RPM, ours, and "others"... If the MAF value is off a couple percent at a particular RPM, no big deal. If the MAF value is off by 10%+ at a specific RPM value, we're way out in limbo for the tune (stock or otherwise). "Other" CAI is off near 15%.

Hope this helps to explain why all the effort...

Phil

Edit: hard to read pic, but Other is 209, stock is 245, BOE is 245

[Plackslayer]

Once the exhausts are done for other LT members, if you still need an N/A to test upon - let me know.

[squidward]

Awesome that there will be yet another option for us Evora owners.

Definitely looking forward to some sound clips.

Btw I wonder if the "other" measurements was of the highly popular Radium CAI. I personally have not had any problems with mine (and in fact would go as crediting it for remarkable improvement in my cars reliability since installing it).

[nicosaurus]

Nice job guy's!
Sounds clear with nice explanations!

Would you consider to ship to EU?

Cheers
Nico

[ramtin1000]

Can't wait to get my hands on one

[Lotustwn]

Seeing how this connects directly from the outside, would there be any issues driving this in rain? pouring rain? Monsoon season?


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[hifiandmtb]

Very keen to hear some video footage of this solution in action.

I just can't tolerate the "other" Aftermarket CAI sucky-sound on part throttle.

[Julian73]

Originally Posted by Lotustwn

Seeing how this connects directly from the outside, would there be any issues driving this in rain? pouring rain? Monsoon season?


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External intake draw is exactly the same location as OEM, while OEM does have some extra protection of feeding air box from lower half updrafting through the filter then feed out to manifold from top this setup the new layout also draws uphill from the intake hose (positioned and sized similar to stock) under the intake scoop, into the airbox with a conical filter above the bottom surface so should be tolerant of rain. This box has been used succesfully on the Elise/Exige for a while now.

[Julian73]

Originally Posted by XHILR8N!

Don't do this! I've sworn "No mods!"

And please don't make her sound better!

It does sound better, more like an exotic car and its a fully reversible mod.