Emira JB4 Tuning Now Available for I4 & V6 Cars!

[675430VME]

The 2.0 is closed deck forged internals so technically higher boost can be achieved. I have no idea what the baseline boost is from Mercedes, but it’s assumed the manufacturer wouldn’t run their engines at the very edge so therefore theoretically there should be more room for higher boost which is why it’s said it should be easy to tune. If you look at true ecu tunes for the Mercedes engine they are achieving +125hp and more with upgraded turbo

Boomgear already has an upgraded turbo sitting in the shop, patiently waiting for someone to crack the ecu lock lol

 

[luciddaydream]

Has anone mentioned how this sumbitch drives after the tune? You'd think it would be nuts but I have not heard anything.

 

[seriously]

I wanted the v6. But I'm not stupid. I always KNEW the AMGI4/DCT combo would be the better powertrain from a performance aspect. One, turbo makes a much fatter torque curve. The DCT makes WAY better use of the power available and has 2 more gears of advantage in acceleration.

If you look at the AMG I4, it also makes way more power UNDER the curve. Its average HP numbers are way up. The v6 only makes its peak HP for like 200rpm at the top, most times we don't even reach this rpm before upshifting. The AMG flattens out a bit, so for several hundred RPM its making peak power, and the 8spd DCT will keep it on tap.

No matter how fast I shift, I'm never going to come close to the speed of the DCT. Not only that, unless Lotus implemented flat food shifting, then the blowoff valve has to vent boost between shifts as the throttle blades close when you lift between shifts. Now, its a supercharger, so the boost comes back WAY faster than a turbo, but thats still a 400-800ms shift, vs probably a 50-80ms shift on the DCT.

The DCT is the real winner here. Best of both worlds would be the screaming V6 (with a VT upgrade so you could rev slightly past power peak and get more avg power) with the DCT to keep it on cam.

Honestly, a valve train upgrade so you could spin about 1000rpm past peak power would allow the V6 to make a lot more AVERAGE power without actually increasing peak power at all.

There's a lot to like in both platforms really. These small displacement turbos don't stop amazing me. Big power and they seem to be getting smaller. Look at what Toyota is doing.

That said, for the analogue experience you can't get much better than a supercharged v6. It builds power like a N/A engine. The only real gripe is the low RPM limit. Otherwise, it's an enthusiast dream.

DCT is a great match for turbo cars. Not sure how tricky the AMG unit is but the Porsche PDK does some interesting trickery with the PDK and turbo spooling to keep it on boost as much as possible.

 

[mr.suntorytime]

Has anone mentioned how this sumbitch drives after the tune? You'd think it would be nuts but I have not heard anything.

it drives like a cat with its tail on fire.

 

[PatrickJS]

it drives like a cat with its tail on fire.

 

[K_Squared]

View attachment 64157

This genuinely made me laugh out loud. I feel exactly the same and nice add with the Emira jacket =p

 

[David s]

I wanted the v6. But I'm not stupid. I always KNEW the AMGI4/DCT combo would be the better powertrain from a performance aspect. One, turbo makes a much fatter torque curve. The DCT makes WAY better use of the power available and has 2 more gears of advantage in acceleration.

If you look at the AMG I4, it also makes way more power UNDER the curve. Its average HP numbers are way up. The v6 only makes its peak HP for like 200rpm at the top, most times we don't even reach this rpm before upshifting. The AMG flattens out a bit, so for several hundred RPM its making peak power, and the 8spd DCT will keep it on tap.

No matter how fast I shift, I'm never going to come close to the speed of the DCT. Not only that, unless Lotus implemented flat food shifting, then the blowoff valve has to vent boost between shifts as the throttle blades close when you lift between shifts. Now, its a supercharger, so the boost comes back WAY faster than a turbo, but thats still a 400-800ms shift, vs probably a 50-80ms shift on the DCT.

The DCT is the real winner here. Best of both worlds would be the screaming V6 (with a VT upgrade so you could rev slightly past power peak and get more avg power) with the DCT to keep it on cam.

Honestly, a valve train upgrade so you could spin about 1000rpm past peak power would allow the V6 to make a lot more AVERAGE power without actually increasing peak power at all.

Who cares. At least my tuned v6 will make more HP than your tuned i4 banger.
You post is probably correct. But nobody buying an emira is stupid. All of us thought what works best for ourselves. I’m just happy that someone came up with a way to improve the performance of our cars to now make them perform as quick as they look. Now let’s see the slaggers throw the “underpowered” shit on our cars. Lotus deserve a kick up the arse for not releasing that HP to its customers.

 

[Emira Fan]

[I’m just happy that someone came up with a way to improve the performance of our cars to now make them perform]​

​

I have another supercharged car, would really like to understand how this JB4 unit is 'creating' more supercharger boost? 2 psi is a lot. Unless Lotus has been venting pressure, and planning to release a S version with full boost.​

I had to changed the crank pulley on one of my other supercharged cars to get a couple pounds of additional boost.​

 

[kdkns]

Who cares. At least my tuned v6 will make more HP than your tuned i4 banger.
You post is probably correct. But nobody buying an emira is stupid. All of us thought what works best for ourselves. I’m just happy that someone came up with a way to improve the performance of our cars to now make them perform as quick as they look. Now let’s see the slaggers throw the “underpowered” shit on our cars. Lotus deserve a kick up the arse for not releasing that HP to its customers.

Every time I post about my Emira on other forms, I get to told how “slow” it is.

Personally I think thats ridiculous, but once the hype and mindset has spread that the car is slow its hard to break the misunderstanding.

The car is as fast as many performance cars out there and plenty for a street / canyon carver. Saying that, I’ll be taking the extra HP for those long highway passes and hooliganism.

 

[NorCalEmira]

[I’m just happy that someone came up with a way to improve the performance of our cars to now make them perform]​

​

I have another supercharged car, would really like to understand how this JB4 unit is 'creating' more supercharger boost? 2 psi is a lot. Unless Lotus has been venting pressure, and planning to release a S version with full boost.​

I had to changed the crank pulley on one of my other supercharged cars to get a couple pounds of additional boost.​

Curious about this as well. I assume they are altering the opening of the blow off valve so that it allows more boost to be available throughout the RPM range. Otherwise, you would need a different pulley to drive the blower at higher speed to increase boost levels. It does appear that Lotus had very conservative tunes in place for such gains to be possible with a piggyback tune.

 

[Thirdgen89gta]

Who cares. At least my tuned v6 will make more HP than your tuned i4 banger.
You post is probably correct. But nobody buying an emira is stupid. All of us thought what works best for ourselves. I’m just happy that someone came up with a way to improve the performance of our cars to now make them perform as quick as they look. Now let’s see the slaggers throw the “underpowered” shit on our cars. Lotus deserve a kick up the arse for not releasing that HP to its customers.

Who says I didn't buy the V6/M6?

That said, what I said still stands. Average power > Peak Power.

 

[Rupes]

Curious about this as well. I assume they are altering the opening of the blow off valve so that it allows more boost to be available throughout the RPM range. Otherwise, you would need a different pulley to drive the blower at higher speed to increase boost levels. It does appear that Lotus had very conservative tunes in place for such gains to be possible with a piggyback tune.

To add to this, the extra boost I assume produces extra heat. Would hate to add power only to create a heat soak issue. Does the increased boost also negatively impact the reliability of the supercharger and engine?

This feels like a no brainer to buy, but want to understand the mechanics/risks of doing it first.

 

[NoFear99]

To add to this, the extra boost I assume produces extra heat. Would hate to add power only to create a heat soak issue. Does the increased boost also negatively impact the reliability of the supercharger and engine?

This feels like a no brainer to buy, but want to understand the mechanics/risks of doing

Who says I didn't buy the V6/M6?

That said, what I said still stands. Average power > Peak Power.

Engine sound > Average power
Manual > automatic

 

[NoFear99]

To add to this, the extra boost I assume produces extra heat. Would hate to add power only to create a heat soak issue. Does the increased boost also negatively impact the reliability of the supercharger and engine?

This feels like a no brainer to buy, but want to understand the mechanics/risks of doing it first.

It will not heat soak for short street pull or 1/4 - 1/2 mile drag race but for tracking it is another story. Heat soak and durability could become a problem over time if tracked.

 

[Thirdgen89gta]

Curious about this as well. I assume they are altering the opening of the blow off valve so that it allows more boost to be available throughout the RPM range. Otherwise, you would need a different pulley to drive the blower at higher speed to increase boost levels. It does appear that Lotus had very conservative tunes in place for such gains to be possible with a piggyback tune.

There are other means to increasing boost if you have variable intake/exhaust cam phasing open to you. The net effect is increased cylinder pressures and an increase in the measured boost in the manifold. Not sure what parameters are open to JB4 to modify.

Engine timing can affect boost, as can the Lobe Separation Angle of the camshafts. Increasing the LSA would decrease overlap between when the intake and exhaust valves are open, a net result would be an increase in cylinder pressure and measured boost in the intake manifold.

but yeah, altering the waste gate duty cycle is easier. Looking at the WG duty cycle parameter when logging a dyno run would tell you if the boost generated is being limited by the pulley, or controlled by the WG.

 

[Kaz]

Weistec 3" charge pipe...handy ports for methanol built in

 

[Tracked Emira]

To add to this, the extra boost I assume produces extra heat. Would hate to add power only to create a heat soak issue. Does the increased boost also negatively impact the reliability of the supercharger and engine?

This feels like a no brainer to buy, but want to understand the mechanics/risks of doing it first.

Time to take out your windshield and install a JUBU louvre to help eliminate the heat soak!

 

[Lotus F1]

Nice, i should have waited a few more weeks as I have the TDI unit. This Jp4 looks better. As far as installation its a pian in the ass with the Turbo. I uploaded the install on another thread which should be the same as for the JP4. That one boost sensor is a bitch that's just above the AC compressor. As to performance, the Turbo US or SE will always be faster than the v6. The DCT alone is a HUGE advantage. I've driven a 6 speed Elise for 20+ years and I ain't missing it at all. The DCT is so much faster and more modern. I am quite enjoying it. The video showing a race between the two models is shocking