📓 Journals Track Journal- JDK's DV Emira in PNW

[Dragoon]

I have a new discovery on the Emira. The straight line speed is significantly slower than other similar powered cars. A 718 GT4 has a tailspeed of 145 mph GPS on the straight of the Ridge Motorsports Park. A A91 supra has a tailspeed of 142+ on GPS. My emira has 136 MPH shown on GPS.
I don't know why... But I just bought the K&N high flow intake filters. Will report back.

It could be because the 718 GT4 weighs about 90 lbs less than the Emira. My Emira weighed in at 3,267 lbs stock with a full tank of gas and full PPF. I'm seeing similar GT4s weigh about 3,180 lbs.

 

[benjh1028]

The 718 GT4 is simply a faster, more track focused (and prepared) car.

 

[Tomwa]

Those speeds are all a bit surprisingly low to me. My Evo 9 does 146 down the front straight until I'm on the brakes for turn one.

Well... it was until session 2 because I was cooking the brakes and needed to lift an coast to have brakes for the whole session.

 

[Dr.JDK]

Here is my fastest lap at the Ridge. I did a 1:52 with the stock Emira (For reference, I did a 1:45 in my 992 GT3, same old cup 2s). Only brake pads were changed and everything including alignment are stock. I read on the forum that the stock front camber is -0.8 and the rear is -1.6. I am scheduling an alignment and test if the understeer can be fixed.

 

[MPD]

nice job, even with the hiccup in the carousel you had a 52. You'll be at 50 in no time. My best is 48 in a C8 on 4Ss so a 45 is impressive!!

 

[Dragoon]

Here is my fastest lap at the Ridge. I did a 1:52 with the stock Emira (For reference, I did a 1:45 in my 992 GT3, same old cup 2s). Only brake pads were changed and everything including alignment are stock. I read on the forum that the stock front camber is -0.8 and the rear is -1.6. I am scheduling an alignment and test if the understeer can be fixed.

Great lap! Did you air down your tires to compensate for high pressures when the tires heat up?

 

[seriously]

Here is my fastest lap at the Ridge. I did a 1:52 with the stock Emira (For reference, I did a 1:45 in my 992 GT3, same old cup 2s). Only brake pads were changed and everything including alignment are stock. I read on the forum that the stock front camber is -0.8 and the rear is -1.6. I am scheduling an alignment and test if the understeer can be fixed.

What a fun looking track! Are you losing traction when braking? I feel like I don't see that too often.

 

[Dr.JDK]

Great lap! Did you air down your tires to compensate for high pressures when the tires heat up?

Yeah I am running 27F 30R Psi hot. After each session, I would air down to the desired pressure. It is about 40 min cool down before the next session.
I am giving the rear higher pressure to overcome the understeer issue.

 

[Dr.JDK]

What a fun looking track! Are you losing traction when braking? I feel like I don't see that too often.

I usually trail brake deep into T6 for a double apex line. The Emira is very sensitive on both steering and braking. When the Front suspensions are fully loaded, a slight steering adjustment may upset the rear. I use it to my advantage by introducing extra rotation. However, as you see in the video, I brake probably 5 feet too late so I have to counter in the middle of T6 or the Carousel.

 

[Dr.JDK]

nice job, even with the hiccup in the carousel you had a 52. You'll be at 50 in no time. My best is 48 in a C8 on 4Ss so a 45 is impressive!!

Porsches are so easy to drive in comparison. I ordered Nankang CRS for my gt3 but it is back ordered until Jan 2025. I think I can definitely drive the GT3 faster after the Emira training. Here is my PB lap of the gt3.

 

[Tomwa]

I'll ask here since I feel like I'm more likely to get a good response than some garmin sales chat bot.

Do you know if you can connect the remote cam for the Catalyst to other Garmin products?

Can i, for instance get myself a Catalyst and use the camera for standard daily-drive dashcam purposes as well?

Good driving btw. I'd really like to do similarly with some of my own cars. Get a common benchmark between the two. What do you get up to with the BRZ TS? I know the TS isn't much different, but does fix the biggest issue with the base cars, which is brakes.

 

[Speedy Emira]

I don't know if you saw it, but here's the dyno chart after I installed the Eventuri. Baseline stock is in blue, Eventuri is in red. The extra power and torque do make a difference. The Porsche has 14 more hp than the Emira, and winds up to 8100 rpm. That could be the difference of 9 mph.

16hp is a very decent increase for an intake, which I assume is the dyno run after you had driven it for a while?

Are the figures slightly lower than factory due to the 91 fuel or are you maybe its not showing at the crank?

 

[Eagle7]

16hp is a very decent increase for an intake, which I assume is the dyno run after you had driven it for a while?

Are the figures slightly lower than factory due to the 91 fuel or are you maybe its not showing at the crank?

Yes, I had been driving with the Eventuri installed for several days to give the ECU time to adjust to it before getting the dyno run. Those numbers are the power and torque to the rear wheels. Assuming the factory stated hp of 400 at the crank, the dyno showing 369.6 hp stock means the drivetrain loss stock is about 7.6%, which is actually quite good. The gain of 16.5 hp from the Eventuri is to the rear wheels, after going through the drivetrain loss. Factoring in for the drivetrain loss, that means the Eventuri increased the power to 418 hp at the crank. That was with everything else totally stock, including all 3 cats and exhaust.

Octane rating in the U.S. is the AKI system, while Europe uses the RON rating system. 91 octane in the U.S. is equal to European 93-95 RON.

 

[Speedy Emira]

Yes, I had been driving with the Eventuri installed for several days to give the ECU time to adjust to it before getting the dyno run. Those numbers are the power and torque to the rear wheels. Assuming the factory stated hp of 400 at the crank, the dyno showing 369.6 hp stock means the drivetrain loss stock is about 7.6%, which is actually quite good. The gain of 16.5 hp from the Eventuri is to the rear wheels, after going through the drivetrain loss. Factoring in for the drivetrain loss, that means the Eventuri increased the power to 418 hp at the crank. That was with everything else totally stock, including all 3 cats and exhaust.

Octane rating in the U.S. is the AKI system, while Europe uses the RON rating system. 91 octane in the U.S. is equal to European 93-95 RON.

Do you know what RON Lotus use to get the 400hp figure? Just wondering if they used 98 RON if the difference would be less.
Could you get access to 98 or 99 fuel for when you do your next dyno run?
Either way still impressive considering how small the air intake is on an Emira. I’m sure some FWD cars benefit more with more than twice the length pipework.
I can’t wait till someone uses 98/99 RON with an exhaust, cat delete and Eventuri.
Has anyone tried a dyno run after lightweight wheels to see if that alters the figures?
Great information as usual.

 

[Eagle7]

Do you know what RON Lotus use to get the 400hp figure? Just wondering if they used 98 RON if the difference would be less.
Could you get access to 98 or 99 fuel for when you do your next dyno run?
Either way still impressive considering how small the air intake is on an Emira. I’m sure some FWD cars benefit more with more than twice the length pipework.
I can’t wait till someone uses 98/99 RON with an exhaust, cat delete and Eventuri.
Has anyone tried a dyno run after lightweight wheels to see if that alters the figures?
Great information as usual.

I'm assuming 93. In the manual they recommend at least 93 RON, so that implies the ECU can adjust for a higher octane than that. 98 RON here would be 93 AKI, and unfortunately I don't have that anywhere near me. I've checked, and nobody here has anything higher than 91. It would be interesting to see what a tank of 93 AKI would do.

For the intake, I don't think pipe length is as important as a smooth straight path, especially going into a supercharger. Exhaust is another story. That's far more complicated because you have to try and get the pipe lengths the same for all 6 exhaust ports, then combine them on each side into one pipe, then combine those two into one that goes into the muffler. Oh and don't forget inserting catalytic converters which are bulky, and require flange couplers on each end. There's hardly any space in the engine compartment for all that. I have no doubt the exhaust system is creating a lot of restriction which is holding back power output.

Ideally you'd want a custom header system that was a tri-y on each side, with each side going into their own cat, then going into their own muffler and exhaust pipe. A setup like that would allow for a crossover pipe between them to balance everything out. Unfortunately we just don't have that kind of room back there.

The dyno I went to was a hub connect dyno. The rear wheels are removed so wheel weight and tires are not a factor.