JB4 Map 4 with Draggy Pro Run!

Lotus F1 · Saturday at 11:25 PM

Okay guys I got the JB4 all sorted out and went for a little ride to the gas station filled it up with e85 and 93 using a app to get me to E30. Because I want all the juice lol. I then went for a little run the car feels real strong and you can definitely tell there's a big difference. It feels really torquey and pulls pretty good in any gear now. I found a nice stretch in Mexico and was able to give it one run. Keep in mind it's a pretty soupy night as it is 87° and humid. So let's see what we got in the real world, or at least with this one run. The car feels more proper racecar. Its fast and I think would outrun the V6

Aforst · Saturday at 11:38 PM

Impressive time! Take it for what it’s worth I was curious if JB4 accounted for the ethanol in the pump fuel. Terry recommended putting in 4-5 gallons of E85 per tank. So basically they did not.

Rayjoedef · Sunday at 6:41 AM

Lotus F1 said:
Okay guys I got the JP4 all sorted out and went for a little ride to the gas station filled it up with e85 and 93 using a app to get me to E30. Because I want all the juice lol. I then went for a little run the car feels real strong and you can definitely tell there's a big difference. It feels really torquey and pulls pretty good in any gear now. I found a nice stretch in Mexico and was able to give it one run. Keep in mind it's a pretty soupy night as it is 87° and humid. So let's see what we got in the real world, or at least with this one run. The car feels more proper racecar. Its fast and I think would outrun the V6View attachment 66314

So you removed the TDI and replaced with JB4? Did you loosen AC compressor belt to get that difficult sensor?

Emira Fan · Sunday at 10:26 AM

Wow, your car pulled ~ 1 G in initial acceleration, impressive.

Shaved .2 sec on 1/4 mile and picked up 2 mph of the C&D results. C&D Probably ran this test on cooler less humid day (December in CA). On a cooler day you'll put down even better figures.
Wonder what the intake temps are with this higher HP and almost 90 degrees outside. Piggyback is your only mod, right ? (no cooling improvements )

Lotus F1 · Sunday at 10:56 AM

Yes

Emira Fan said:
Wow, your car pulled ~ 1 G in initial acceleration, impressive.

Shaved .2 sec on 1/4 mile and picked up 2 mph of the C&D results. C&D Probably ran this test on cooler less humid day (December in CA). On a cooler day you'll put down even better figures.
Wonder what the intake temps are with this higher HP and almost 90 degrees outside. Piggyback is your only mod, right ? (no cooling improvements )

View attachment 66376

just the JB4, nothing else

Eagle7 · Sunday at 4:12 PM

Lotus F1 said:
Okay guys I got the JP4 all sorted out and went for a little ride to the gas station filled it up with e85 and 93 using a app to get me to E30. Because I want all the juice lol. I then went for a little run the car feels real strong and you can definitely tell there's a big difference. It feels really torquey and pulls pretty good in any gear now. I found a nice stretch in Mexico and was able to give it one run. Keep in mind it's a pretty soupy night as it is 87° and humid. So let's see what we got in the real world, or at least with this one run. The car feels more proper racecar. Its fast and I think would outrun the V6View attachment 66314

Be aware that Lotus specifically states in the manual to NOT use fuel with more than 10% ethanol. The warning seems to concern the fuel system, not the engine, which means the fuel system components are not made of the materials that can resist the corrosive effects of ethanol, and E85 is 85% ethanol.

Screenshot 2025-06-22 at 2.37.04 PM.webp

Lotus F1 · Sunday at 9:00 PM

Eagle7 said:
Be aware that Lotus specifically states in the manual to NOT use fuel with more than 10% ethanol. The warning seems to concern the fuel system, not the engine, which means the fuel system components are not made of the materials that can resist the corrosive effects of ethanol, and E85 is 85% ethanol.

View attachment 66386

I'm aware, it's not e85 it's basically E30. I blended e85 with 93. 93 already comes with 10% ethanol so I basically added another 20% for a total of 30%. I have an app that works out all the math. I'm not going to use it all the time

Porter · Sunday at 10:23 PM

I fixed the title for you, to read JB4.

VF Tuner · Sunday at 10:45 PM

It is no issue of the fuel system components at all. It is rather an issue of the ECU being unable to correct for the big gdifference in fuel demand on fuels with higher ethanol content.
Same exact wording on all cars.

Kaz · Sunday at 11:00 PM

Eagle7 said:
Be aware that Lotus specifically states in the manual to NOT use fuel with more than 10% ethanol. The warning seems to concern the fuel system, not the engine, which means the fuel system components are not made of the materials that can resist the corrosive effects of ethanol, and E85 is 85% ethanol.

View attachment 66386

This is common boilerplate language for most modern vehicles and comes from SAE guidance. In terms of seals, pumps, etc. the stuff that can get corroded, simply using normal gas in rotation to basically flush out the system is what you can do to keep everything tidy. It's over a longer period of time with the alt fuels sitting in the car that can cause issues if the fuel system isn't rated for it -

Lotus F1 · Sunday at 11:37 PM

Porter said:
I fixed the title for you, to read JB4.

Ah yes thank you

Lotus F1 · Sunday at 11:41 PM

The car ran very smooth on the E30 map but it did seem to run about 7° warmer but I still have to confirm that. No check engine lights.

JB4 Map 4 with Draggy Pro Run!

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