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Discussion Starter #1
My friend recently had this installed and as soon as I heard his car with it I knew I needed to have one. Makes the supercharger absolutely scream. I have done many intake changes on cars and never had results like this. GRP even did a dyno with it and has decent gains. So now car has Larini exhaust, GRP decat and cold air intake. Should have the komo-Tec tune file tomorrow to download and then looks like I'm done with go fast and sound mods. Thanks again Greg for the help with this and get busy on more carbon fiber mods for 400 :)
 

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Discussion Starter #3
Me and my friends always joke about how good we are at spending other peoples money. But at least parts for the Lotus are reasonable. Just downloaded the tune and seemed to go well and no airbag light. It says to check lamdba but I have tried using my reader and it doesnt show that or actual AF?. Fuel trims look good though
 

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Could you explain a little more what you mean by "check lambda"? Is that a message on your laptop or somewhere on your instrument panel?

My airbag light didn't show up right away and was initially intermittent but now it's on all the time. Hopefully you don't get it.
 

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Illegal Alien
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Could you explain a little more what you mean by "check lambda"? Is that a message on your laptop or somewhere on your instrument panel?

My airbag light didn't show up right away and was initially intermittent but now it's on all the time. Hopefully you don't get it.
Lambda is the alternative scale for Air Fuel ratio. 14.7 = 1.0 lambda, lambda above 1 = lean, below 1 = rich. This can only be checked with a wide range AFR instrument as cars O2 sensors are narrow band designed to basically trigger digitally trigger the ECU with on/off info, i.e. above stoichiometric 14.7 or below.
 

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Oh no Julian73 thats not what I meant (I have logged AFRs on numerous other cars). I am asking Redsled about where he got that warning - with a CEL of some sort or did he notice it via the Komo Tec software?
 

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2005 Elise LSS Saffron Yellow
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Lambda is the alternative scale for Air Fuel ratio. 14.7 = 1.0 lambda, lambda above 1 = lean, below 1 = rich. This can only be checked with a wide range AFR instrument as cars O2 sensors are narrow band designed to basically trigger digitally trigger the ECU with on/off info, i.e. above stoichiometric 14.7 or below.
I have a maybe-important, maybe not (depending on what you're doing) quibble with this statement.

Lambda (λ) is, in fuel chemistry, the stoichiometric ratio of fuel to air: the proportion at which there is exactly enough oxygen available to completely combust the fuel present. The energy density of fuel varies significantly, even at the pump by the side of the road. If you have a fuel with no ethanol in it with an average gasoline density, you'll have an AFR of about 14.7 at lambda. If you're burning E10 (which almost all high test fuel in the US is), then lambda is around 14.13. If you're burning E100, lambda is at an AFR of about 9.

The EGO sensor on the car is actually reporting the presence or absence of free (excess) oxygen in the exhaust. It's a binary yes/no answer: are we above lambda or at/below lambda right now? Accordingly, the ECU constantly dithers the amount of fuel injected to stay a known distance from lambda in one direction or the other.

The ECU isn't concerned with AFR at all. It worries about being out of reasonable bounds of fuel injected per intake stroke given the operating conditions of the moment (which might indicate a component failure), and it is constantly hunting for lambda. That's pretty much it.

Because of the variability and limited meaning to modern systems, it's probably a good idea to stop thinking about AFR at all. It makes sense for carburetors, but not so much for EFI with a lambda sensor.
 

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Illegal Alien
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I have a maybe-important, maybe not (depending on what you're doing) quibble with this statement.

Lambda (λ) is, in fuel chemistry, the stoichiometric ratio of fuel to air: the proportion at which there is exactly enough oxygen available to completely combust the fuel present. ....
I agree with your statements, for one I was trying to be brief, yes O2 sensors only measure oxygen content and feedback loop reposted to lambda rich or lean as I stated. AFR is only meaningful in the context of what fuels is being used. E10 vs pure gasoline is not a significant deviation, but the difference does highlight the importance of removing AFR from the equation and focusing on lambda.

ECU adjusts for stoichiometric or preset off that only in closed loop operating cycle and that is not under hard accelerations when current ECU's then refer to fuel tables for proper enrichment.
 

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Discussion Starter #9 (Edited)
Oh no Julian73 thats not what I meant (I have logged AFRs on numerous other cars). I am asking Redsled about where he got that warning - with a CEL of some sort or did he notice it via the Komo Tec software?
Was no warning, but on last page instructions it says to check Lambda and it should be in .80-.85 range. But I guess only way to check on Lotus is put a sensor in tail pipe. On my Huracan I can record that along with AF on obdi reader, but can’t even check AF on Lotus? I am seeing fuel trim and long term is running up to +10, so guessing tune is calling for more fuel? after downloading I left for a 3 day rally. Drove over 200 miles today including driving up a mountain and car ran flawlessly. With tune and cai it feels quicker, snappier and sounds amazing. My friend with the Komo Tec 465 kit is also on trip and his car is running great
 

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Is there and installation guide for the 400? The website for GRP does not have installation instructions and says coming soon. What’s all involved with installing this?
 

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Discussion Starter #11
I thought about doing myself but since no detailed instructions yet I let dealer do it. I’m only about 40 minutes from them so I don’t mind going in. I watched most of the install and looked pretty easy and straightforward, took a little over an hour. Can’t wait to get back in car today and rip through some mountain roads,sound of screaming supercharger is so addictive
 

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Gotcha. That’s pretty much the hold up from me picking this up. Since I’m still under factory warranty for the next couple years, I would want to have instructions on putting this together and taking apart in case I have to take the car in for warranty issues. Surprised there has not been any documentation from GRP yet.
 

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Did any of you find a way to keep the new intake from pushing into the fender liner? Mine pushes Into it just a bit where the factory access hole is. It fits, but just curious if anyone found a way to eliminate that.


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Illegal Alien
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Gotcha. That’s pretty much the hold up from me picking this up. Since I’m still under factory warranty for the next couple years, I would want to have instructions on putting this together and taking apart in case I have to take the car in for warranty issues. Surprised there has not been any documentation from GRP yet.
Factory Service Notes has a go by on removing /installing the factory box. GRP install will be very straight forward, much less tricky that OEM box.
 

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Illegal Alien
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Did any of you find a way to keep the new intake from pushing into the fender liner? Mine pushes Into it just a bit where the factory access hole is. It fits, but just curious if anyone found a way to eliminate that.


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I don't have one in hand, but thinking back to my BOE intake on the Series 1, would a zip tie around it act as a stop?
 

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Discussion Starter #17 (Edited)
Did any of you find a way to keep the new intake from pushing into the fender liner? Mine pushes Into it just a bit where the factory access hole is. It fits, but just curious if anyone found a way to eliminate that. Have now put about 600 miles on since tune and intake and car running better than ever!


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I think it’s because the intake hose is to long. I know on both mine and friends tech trimmed it down to a size that let it sit better
 

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Reviving an older thread here....
Any difference between GRP and BOE intake?
 
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