I swear I searched, JB4 MAP2 vs C7?

[JoeyBananas]

Just curious, I have seen some videos of JB4 cars with Meth or E85 vs C7s, but can't find a clean video or "story" of MAP2 JB4 vs C7 from a roll?

Just curious how a JB4 car on MAP2 (or any other MAP )would do vs a C7

Thanks and don't kill me if there has been multiple threads before on this.

[infamousdiz]

Originally Posted by JoeyBananas

Just curious, I have seen some videos of JB4 cars with Meth or E85 vs C7s, but can't find a clean video or "story" of MAP2 JB4 vs C7 from a roll?

Just curious how a JB4 car on MAP2 (or any other MAP )would do vs a C7

Thanks and don't kill me if there has been multiple threads before on this.

its pulls on the vette, if you look its in here somewhere

[JoeyBananas]

thanks Brotha

[CloudVIII]

Originally Posted by JoeyBananas

Just curious, I have seen some videos of JB4 cars with Meth or E85 vs C7s, but can't find a clean video or "story" of MAP2 JB4 vs C7 from a roll?

Just curious how a JB4 car on MAP2 (or any other MAP )would do vs a C7

Thanks and don't kill me if there has been multiple threads before on this.

If you run meth you can pull a lightly modded ZO6

[JoeyBananas]

Awesome Video, never saw that before, did not think the M4 would pull away, lol

Dont want to run Meth but how close is the Race Gas MAP to Meth MAP as far as power goes?

[CloudVIII]

Originally Posted by JoeyBananas

Awesome Video, never saw that before, did not think the M4 would pull away, lol

Dont want to run Meth but how close is the Race Gas MAP to Meth MAP as far as power goes?

Race gas would be similar with out the cooling benefits. E30 is also good!

https://www.youtube.com/shared?ci=TaIX15VXZdQ

[JoeyBananas]

Originally Posted by CloudVIII

Race gas would be similar with out the cooling benefits. E30 is also good!

https://www.youtube.com/shared?ci=TaIX15VXZdQ

Thanks!

[Taimur]

I sold my f80 m3 with jb4 running map 2 and now own a '17 Z06. I never lined them up but the Z06 is way faster completely stock. I may get a chance to run my friends f80 soon.

[JoeyBananas]

Originally Posted by Taimur

I sold my f80 m3 with jb4 running map 2 and now own a '17 Z06. I never lined them up but the Z06 is way faster completely stock. I may get a chance to run my friends f80 soon.

I'm sure, I meant a non Z06

[Taimur]

Ah... I misread it. IMO compared to a regular C7 the jb4 m3 will be faster.

[CaryTheLabelGuy]

I pulled on multiple C7Z's with my ZCP M4 using a JB4 on custom map 6 on E40 mixed with 93 octane. I was only running about 22 psi.

You have to allow the DME to adjust timing for the higher octane fuel, this is a common mistake people seem to make. Once the DME adjusted, on E40 my stock timing curve was maxed out and the car picked up lots of power, even with lower boost pressures. I was able to easily make more power with less boost pressure (which is preferred).

Timing and the detonation threshold is everything.

[JoeyBananas]

Originally Posted by CaryTheLabelGuy

I pulled in multiple C7Z's with my ZCP M4 using a JB4 on custom map 6 on E40 mixed with 93 octane. I was only running about 22 psi.

You have to allow the DME to adjust timing for the higher octane fuel, this is mistake people seem to make. Once the DME adjusted, on E40 my stock timing curve was maxed out and the car picked up lots of power, even with lower boost pressures.

Timing and the detonation threshold is everything.

Interesting, about how long before the car adjusts once MAP is switched, a few highway pulls or just a few minutes regular driving etc?

[Taimur]

Originally Posted by CaryTheLabelGuy

I pulled on multiple C7Z's with my ZCP M4 using a JB4 on custom map 6 on E40 mixed with 93 octane. I was only running about 22 psi.

What you say here is that your is trapping over 130 in the 1/4 or running against a Z06 driver who can't drive. Have you ever taken you car to the drag strip?

IMO unless you are on upgraded turbos you'll have a very hard time against a C7Z.

[CaryTheLabelGuy]

Originally Posted by JoeyBananas

Interesting, about how long before the car adjusts once MAP is switched, a few highway pulls or just a few minutes regular driving etc?

WOT pulls. But it's more complicated than this.

It's not the map switch, so much as the switch to higher octane fuel and the fact that as ethanol mixtures increase, so do fueling requirements. When going from straight 93 pump to an ethanol mix, it needs to be slowly increased. You can't jump straight to E40 on the ZCP (E30 for the non-ZCP). Fuel trims take a few pulls to adjust at WOT. You have to work your way up to your max ethanol mix. You also need to adjust FOL settings in the JB4 (I mention this a lot in other threads).

As for timing, the DME is very smart and knows how much timing it can run safely. When you increase octane, it'll take several WOT pulls for the DME to increase timing. But if trims go too lean (from either too much boost and/or too much ethanol), this will cause the DME to lower AFR targets and if they go rich enough (low 11:1 range or lower) the engine will misfire and the DME will shut down the offending cylinders and throw a drivetrain malfunction and a multiple cylinder misfire DTC. During misfires, the DME might register instances of knock and lower timing on the next runs (once you shut down the car and clear the misstire codes).

It's a balancing act when going to ethanol mixtures and you have to know how to interpret the data as you go. If you're unsure or don't totally understand it, I'd say stay away and just run Map 2 with 93 octane and monitor for bad timing pulls or overall low timing.

[JoeyBananas]

Originally Posted by CaryTheLabelGuy

WOT pulls. But it's more complicated than this.

It's not the map switch, so much as the switch to higher octane fuel and the fact that as ethanol mixtures increase, so do fueling requirements. When going from straight 93 pump to an ethanol mix, it needs to be slowly increased. You can't jump straight to E40 on the ZCP (E30 for the non-ZCP). Fuel trims take a few pulls to adjust at WOT. You have to work your way up to your max ethanol mix. You also need to adjust FOL settings in the JB4 (I mention this a lot in other threads).

As for timing, the DME is very smart and knows how much timing it can run safely. When you increase octane, it'll take several WOT pulls for the DME to increase timing. But if trims go too lean (from either too much boost and/or too much ethanol), this will cause the DME to lower AFR targets and if they go rich enough (low 11:1 range or lower) the engine will misfire and the DME will shut down the offending cylinders and throw a drivetrain malfunction and a multiple cylinder misfire DTC. During misfires, the DME might register instances of knock and lower timing on the next runs (once you shut down the car and clear the misstire codes).

It's a balancing act when going to ethanol mixtures and you have to know how to interpret the data as you go. If you're unsure or don't totally understand it, I'd say stay away and just run Map 2 with 93 octane and monitor for bad timing pulls or overall low timing.

Thanks. I'll be running MAP2 with 93 & 109. Not really any Ethanol close by

[CloudVIII]

Originally Posted by Taimur

What you say here is that your is trapping over 130 in the 1/4 or running against a Z06 driver who can't drive. Have you ever taken you car to the drag strip?

IMO unless you are on upgraded turbos you'll have a very hard time against a C7Z.

FYI there are are stock turbo S55 above 130 trap. 133 I believe is the highest I have seen. 10.8 1/4 mile as well. Meth really helps these cars.

[JoeyBananas]

dumb question but on MAP 2 from a highway roll, would I be best to shift at redline or shift bit earlier?

[shiv.nandak]

Originally Posted by Taimur

I sold my f80 m3 with jb4 running map 2 and now own a '17 Z06. I never lined them up but the Z06 is way faster completely stock. I may get a chance to run my friends f80 soon.

I switched to a Z06 too. Z06 is just stupid fast. Completely breaks the rear tires anytime under 40mph with full traction control on.

[Towerworld]

Originally Posted by CloudVIII

FYI there are are stock turbo S55 above 130 trap. 133 I believe is the highest I have seen. 10.8 1/4 mile as well. Meth really helps these cars.

that's still not as quick as a z06 with a good driver.

[CloudVIII]

Originally Posted by Towerworld

that's still not as quick as a z06 with a good driver.

It would be close from a roll with the gearing and the DCT F8x have.

[Towerworld]

Originally Posted by CloudVIII

It would be close from a roll with the gearing and the DCT F8x have.

Agreed but I think an Automatic z06 will pull on it.

[Taimur]

Originally Posted by shiv.nandak

I switched to a Z06 too. Z06 is just stupid fast. Completely breaks the rear tires anytime under 40mph with full traction control on.

Get the wheel alignment. My car felt the same but since I got it aligned, the car hooks much better. I'm following DSCs recommended street settings. Positive rear castor really helps too. Just need to find a performance shop that can do alignments, dealers suck in that department.