I have known more than 10 cars that got injector replaced by the dealers. One guy got rejected for injector warranty replacement because he had a BMC and a generic piggyback. I am still going to install a JB4 because I don't care paying out of my pocket if that happens.
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Emira JB4 Tuning Now Available for I4 & V6 Cars!
- Thread starter GRP
- Start date
Barcino2012
Emira Fan
I will place it over the battery compartment, elevated with 2 “runners” so it does not get affected by any minor water that enters through the driver side drain hole. There is very minor water entry anyways…….
Blackthought_
Emira Fiend
Those with the JB4 right now 
Alright, so after a way longer than I'd like to admit fight with getting the sensor clips to release (don''t want to break them!), I successfully installed the JB4 this morning. I have a bracket coming so I actually just ran the actual unit in the trunk with the wire sitting on top of the trunk seal, and will probably leave it this way with the engine covers off until the bracket gets delivered.
I am a degenerate and immediately went to the 93 map. The power is very noticeable, especially in the mid range. I would say the 3-4 shifts felt like the car built speed like my 991.2 GTS did. I did about a 10 minute test drive loop before reporting back, but results certainly as advertised.
While "in Mexico," I had previously taken the car up to around 140 mph before the tune — and it definitely took some time, especially trying to keep pace with an STO, a GT3, and a few other high-horsepower cars. After the tune, the most telling part of the experience was how effortlessly it pulled from 120 to 130 mph in the 3rd to 4th gear shift — completely drama-free. I used to joke that in my 911, that shift took you from “just a ticket” to “going to jail,” and without question, this car now gives off that same energy.
Out of curiosity, I used some assumptions to run some chatgpt calcs on power to weight ratio between these cars (and our Taycan GTS) for comparison:
** Assumptions made on the WHP being slightly elevated on the Emira as I have an eventuri intake and titanium exhaust installed/milltek controller installed** I also was catless and custom tuned on the 911. **
I originally picked up the Emira as a "stop-gap" car — something fun to drive while I worked toward an F8 or 296. But over the past couple of months, I’ve had this growing feeling that with the right modifications — coilovers, wheels, and the tune — the Emira offers a uniquely compelling blend of performance, packaging, and driving experience.
Long story short: if you’re on the fence about this tune, it should be a no-brainer. It completely transforms the car.
I am a degenerate and immediately went to the 93 map. The power is very noticeable, especially in the mid range. I would say the 3-4 shifts felt like the car built speed like my 991.2 GTS did. I did about a 10 minute test drive loop before reporting back, but results certainly as advertised.
While "in Mexico," I had previously taken the car up to around 140 mph before the tune — and it definitely took some time, especially trying to keep pace with an STO, a GT3, and a few other high-horsepower cars. After the tune, the most telling part of the experience was how effortlessly it pulled from 120 to 130 mph in the 3rd to 4th gear shift — completely drama-free. I used to joke that in my 911, that shift took you from “just a ticket” to “going to jail,” and without question, this car now gives off that same energy.
Out of curiosity, I used some assumptions to run some chatgpt calcs on power to weight ratio between these cars (and our Taycan GTS) for comparison:
** Assumptions made on the WHP being slightly elevated on the Emira as I have an eventuri intake and titanium exhaust installed/milltek controller installed** I also was catless and custom tuned on the 911. **
I originally picked up the Emira as a "stop-gap" car — something fun to drive while I worked toward an F8 or 296. But over the past couple of months, I’ve had this growing feeling that with the right modifications — coilovers, wheels, and the tune — the Emira offers a uniquely compelling blend of performance, packaging, and driving experience.
Long story short: if you’re on the fence about this tune, it should be a no-brainer. It completely transforms the car.
The V6 FE has a curb weight of approximately 3,267 lbs as per @Dragoon who weighed his stock on a race scale. The Eventuri is 1/2 lb lighter, and if you got the Aerie titanium exhaust, that's 18.25 lbs lighter than stock. So figure your car is roughly 19 lbs lighter, so a curb weight of 3,248. A relatively inexpensive way to pull another 30 lbs out of the car is to upgrade to an AntiGravity battery from @GRP. The 40ah is plenty powerful. That'll get you down to 3218 which is close to the 911's.
Are you going to connect your JB4 to the OBDII plug? It would be interesting to see what the numbers are with an Eventuri and the Ti exhaust.
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I’m hesitant to push through the firewall but I have the cable - Possibly rig it up this weekend to catch the data.
there is a passage behind the felt trim panel and remove the bulkhead panel. should be a grommet covering a hole.
Hi, this may have been covered....is there a bracket for the I4 or one in the same?
The bracket works for both. One thing that has not been verified is the length of the harness for the i4 variant to the mounting location. Hopefully someone with an i4 can test for us.
Not to take away from Darkworks Design but I'm planning to make a 3D printed bracket. PETG should be able to withstand temperatures above the airbox.
Darkwork's bracket looks genuinely nice but I'm not sure it will be visible. Just need something better than zip ties to hold box in place.
Anyone advise on a better 3D filament for use in the engine bay?
Darkwork's bracket looks genuinely nice but I'm not sure it will be visible. Just need something better than zip ties to hold box in place.
Anyone advise on a better 3D filament for use in the engine bay?
POM, PET, PPS
For science, data re ran with the accurate weight of my car:
Earlier today, I had the chance to put about 60 miles on the car along Lime Creek in Austin — a road known for its tight turns, frequent cyclists, and typically some police presence at both ends. I wasn’t pushing the car for several reasons, but I did open it up coming out of a few corners. Running the 93 map, the biggest difference was clear: the car now has power out of corners that just wasn’t there before without slapping the redline..
| Car & Configuration | Power (whp) | Crank HP | Curb Weight (lbs) | PWR (lbs/whp) | PWR (lbs/hp) |
|---|---|---|---|---|---|
| Emira V6 (Tuned) | 480 | ~550 | 3,248 | 6.77 | 5.90 |
| 911 GTS (Tuned) | 528 | 600 | 3,197 | 6.05 | 5.33 |
| Taycan GTS (2024) | ~590 | 590 | 5,060 | 8.58 | 8.58 |
| Emira V6 (Stock) | ~345 | 400 | 3,248 | 9.41 | 8.12 |
| 911 GTS (Stock) | ~396 | 450 | 3,197 | 8.07 | 7.10 |
Earlier today, I had the chance to put about 60 miles on the car along Lime Creek in Austin — a road known for its tight turns, frequent cyclists, and typically some police presence at both ends. I wasn’t pushing the car for several reasons, but I did open it up coming out of a few corners. Running the 93 map, the biggest difference was clear: the car now has power out of corners that just wasn’t there before without slapping the redline..
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