Emira JB4 Tuning Now Available for I4 & V6 Cars!

[Turbo, did a 3.2 0-60]

How did your launch go ; any wheel spin? Assume you used Launch control. How hot outside was it durning your run?
 
[Turbo, did a 3.2 0-60]

How did your launch go any wheel spin (80's)? Assume you used Launch control. How hot outside was it durning your run?
I was in Florida so pretty warm (80's). Tires screeched slightly. I have the sport package and better tires. Launch control
 
[Tires screeched slightly.].
Sounds perfect, as with most mid-rear engine cars, massive about of traction under launch conditions.
Brooks with Drag times and C&D recorded 3.4 s to 60 (stock). Brooks mentioned a 3.3s. Clearly your putting down better numbers with your mod.

Probably need another 40-50 hp to dip into the 2s. Similar to standard Vet. But IMO adding that much total power will require cooling mods.

For the TDI piggyback did you have to plug into the Boost sensor on the firewall?
 
[Tires screeched slightly.].
Sounds perfect, as with most mid-rear engine cars, massive about of traction under launch conditions.
Brooks with Drag times and C&D recorded 3.4 s to 60 (stock). Brooks mentioned a 3.3s. Clearly your putting down better numbers with your mod.

Probably need another 40-50 hp to dip into the 2s. Similar to standard Vet. But IMO adding that much total power will require cooling mods.

For the TDI piggyback did you have to plug into the Boost sensor on the firewall?
3 sensors, the one on the intercooler (yes, the hard to reach one), the cam shaft/rpm sensor, and Manifold sensor (fire wall). Interestingly the JP4 doesn't use the sensor for the RPM/cam sensor like the TDI did. So basically, if you're not using the OBD2 connection it's not getting rpm information I would think. TDI 3 sensor. Jp4 2 sensor unless using OBD2 🤷‍♂️
 
What's the point of installing the JB4 if you can't run MAP 2 or 3 for a track event because of over heating?
Isn't it better to install a piggy back that will unleash more power by getting the rev limiter past the 6,800 RPM wall?
What are the best fixes available that can be installed to keep the temps low?
I removed the rear windsheild and installed the JUBU louvre which allows more heat to escape already.
Will the new VF Tuner supercharger lid help to keep temperatures low?
Yea only option is a JUBU tuning. New ECU and can do all this. Currently have the 460 kit with the cooling upgrade. I run track mode and run it hard and engine temp is max 175 degrees Fahrenheit. I love it!
 
Last edited:
Just out of curiosity I looked into E85 gas which I know is popular with tuners, and the Emira is not listed as a Flex Fuel car. It's rated for E5 or E10, but the manual specifically states to not put more than a 10% mix of ethanol in the car.

Screenshot 2025-06-22 at 2.37.04 PM.webp
 
it had only meant to be a reply to someone who was mentioning heat issues and our product. We have our own thread.
I’m sorry but I read your response differently. “It’s a recipe for something bad to eventually happen” sounds like a bit of mud slinging. Seemed a bit much - especially when you don’t have any products yet. We welcome all quality vendors and appreciate all the hard work you guys put in designing and bringing things to market. Just asking to be respectful to the others here.
 
Think I’d rather listen to my Lotus dealer who said the JB4 is fine. And the ECU does take over if any of the parameters are exceeded. But thanks anyway.
I have no opinion either way in relation to the JB4 and various other tunes.
I'm watching all this with interest and may do something once warranty expires, and when all of these concerns are put to bed one way or the other.

I just make the observation that you must have a very relaxed dealer.

Mine made it clear they had no issues with mods such as air intakes, cat delete, exhaust, etc., but touch the ECU in any way and you're on your own.
 
I have no opinion either way in relation to the JB4 and various other tunes.
I'm watching all this with interest and may do something once warranty expires, and when all of these concerns are put to bed one way or the other.

I just make the observation that you must have a very relaxed dealer.

Mine made it clear they had no issues with mods such as air intakes, cat delete, exhaust, etc., but touch the ECU in any way and you're on your own.
I don't get why a dealer would care. Doesn't Lotus have to pay for warranty work to the dealer
 
I don't get why a dealer would care. Doesn't Lotus have to pay for warranty work to the dealer

The dealer wouldn't care.
But as you say they wouldn't do any work under warranty unless Lotus was paying them, and the suggestion is that if you play around with the ECU and then something blows up Lotus won't cover it.

But they would probably be more relaxed about other mods provided they couldn't be proven to have directly contributed to the failure.
 
The dealer wouldn't care.
But as you say they wouldn't do any work under warranty unless Lotus was paying them, and the suggestion is that if you play around with the ECU and then something blows up Lotus won't cover it.

But they would probably be more relaxed about other mods provided they couldn't be proven to have directly contributed to the failure.
Well I guess the easy answer is just remove it. Just because I knew you had it but then you removed it would leave no signs of it ever existing to Lotus
 
I have no opinion either way in relation to the JB4 and various other tunes.
I'm watching all this with interest and may do something once warranty expires, and when all of these concerns are put to bed one way or the other.

I just make the observation that you must have a very relaxed dealer.

Mine made it clear they had no issues with mods such as air intakes, cat delete, exhaust, etc., but touch the ECU in any way and you're on your own.
I would not say they are relaxed. Ive had a relationship with them for over 20 years. Some of them worked as engineers for Lotus UK and qualified at Oxford in Mec engineering. They also are involved with Lotus engineering developing products for them(the SC1230, 1700, and 1900). They have had extensive experience with the Lotus ECU and know how they work. They are currently fitting the JB4 on a few cars when I went there a few days ago to book my car in for a service next week and discussed with them the fitting of the OBE cable through to the JB unit. They currently testing a couple of cars with the unit it them and checking operating parameters to assess if the unit is being learned down by the ECU. I`ll know more when I speak to them when I get my car back after the service.
 
Well I guess the easy answer is just remove it. Just because I knew you had it but then you removed it would leave no signs of it ever existing to Lotus

You may be right, but I doubt it's that simple.
I wouldn't be remotely surprised if there is some trace left somewhere that shows something had been done.

Not to mention, if you think Lotus and / or dealers don't read this stuff you should think again.

I once had a throwaway comment (amongst hundreds of others) I made on a Ferrari forum quoted back to me and I never quite got the same treatment from the dealer after that... :ROFLMAO:

So I suspect Lotus know exactly who has done what to their cars, regardless of how the car may present to the dealer when taken in for work.
 
I don't get why a dealer would care. Doesn't Lotus have to pay for warranty work to the dealer
Because all warranty works have to go through Lotus Hethel and most of the time requires a live connection to HQ for data analysis. If HQ denies your warranty claim, your dealer will get nothing for the work they already did.
 
I would not say they are relaxed. Ive had a relationship with them for over 20 years. Some of them worked as engineers for Lotus UK and qualified at Oxford in Mec engineering. They also are involved with Lotus engineering developing products for them(the SC1230, 1700, and 1900). They have had extensive experience with the Lotus ECU and know how they work. They are currently fitting the JB4 on a few cars when I went there a few days ago to book my car in for a service next week and discussed with them the fitting of the OBE cable through to the JB unit. They currently testing a couple of cars with the unit it them and checking operating parameters to assess if the unit is being learned down by the ECU. I`ll know more when I speak to them when I get my car back after the service.
Your dealer is indeed very chill and relaxed, giving the fact they are installing a piggyback system as a dealer. One of my friends was rejected for warranty on his defective injectors, and the reason was that Lotus Hethel had proof a piggyback was installed from the data they pull.
 
You may be right, but I doubt it's that simple.
I wouldn't be remotely surprised if there is some trace left somewhere that shows something had been done.

Not to mention, if you think Lotus and / or dealers don't read this stuff you should think again.

I once had a throwaway comment (amongst hundreds of others) I made on a Ferrari forum quoted back to me and I never quite got the same treatment from the dealer after that... :ROFLMAO:

So I suspect Lotus know exactly who has done what to their cars, regardless of how the car may present to the dealer when taken in for work.
I can't believe how people still believe things like these are undetectable...
 
Your dealer is indeed very chill and relaxed, giving the fact they are installing a piggyback system as a dealer. One of my friends was rejected for warranty on his defective injectors, and the reason was that Lotus Hethel had proof a piggyback was installed from the data they pull.
Exactly.

I have nothing against this type of development for our cars (quite the opposite) but people really need to go in with their eyes open.

The thought that you could do whatever you want and then if your car blows up just reverse it, pretend it never happened, take it to the dealer and it’ll be covered is naive to say the least.

Especially if you post it on a public forum.
Trust me. Lotus and your dealer know exactly who you are and what you’ve done to your car.

If you’re going to do this, you need to have the attitude that some owners clearly have - if it blows up it’s on me.
I’ll wear the cost and I’m happy to take the risk.

If you’re not prepared to have that attitude, think again.
Or at least wait until the warranty is over.
 

Create an account or login to comment

Join now to leave a comment enjoy browsing the site ad-free!

Create account

Create an account on our community. It's easy!

Log in

Already have an account? Log in here.

Back
Top