[AngryInch]

Originally Posted by pbonsalb

Those are the reasons I have run meth in my cars for the past 20 years. No E85 around and race gas is too expensive to run full time. The meth is there whenever it is called upon, which is probably around 40% load or higher. I probably use 2 gallons a month since I don’t track and don’t drive like a teenager. I keep a 5 gallon can or two around and mix 70/30 meth distilled water.

Im just not a huge fan of meth for octane use. Cooling, sure, but with using it for octane, if that pump ever fails, its like you went from race gas to pump gas instantly.... Worries me a bit too much.

[pbonsalb]

That is why you use a tune with safeguards in case the meth stops.

[DrivenAgain]

Originally Posted by AngryInch

Can you post the log of this? Id love to see where your timing, boost, etc are at.

Any other mods? What DA?

Thx

2018 M5 CCBs
JB4/Project Gamma Intake
E40
No other mods
This is just a screen shot. I suggest you download Datazap.me and I can send you the full .csv and you can scroll thru run to see various data points.
DA216

[AngryInch]

Your timing is huge!! I’d be lucky to hit 15degrees for a tiny bit. I’m usually around 8-10 degrees.

Your boost is nice and smooth too. When my car shifts, the boost spikes, it’s sample before the throttle, curious why yours doesn’t spike, it drops and climbs again.

Also, your fuel trim is rock solid at 44, no adjustment… what’s with that?

[DrivenAgain]

Originally Posted by AngryInch

Your timing is huge!! I’d be lucky to hit 15degrees for a tiny bit. I’m usually around 8-10 degrees.

Your boost is nice and smooth too. When my car shifts, the boost spikes, it’s sample before the throttle, curious why yours doesn’t spike, it drops and climbs again.

Also, your fuel trim is rock solid at 44, no adjustment… what’s with that?

One part of that timing jump is the low IATs and DA, it was 55deg Fahrenheit. The other part is the E40, its a very very potent fuel. Many like me run E mix over racegas.

This a custom written Map 6 and it addresses the overall power delivery including ramped in boost, each gear has its own boost profile.

Good catch on the fuel trims. This is an indication that I'm maxed out on injector at this DA. I have to dial back to about E35 or add meth, which is coming next.

[AngryInch]

My DA is not good, because of elevation, but my IAT is almost the same as yours… it was only 15c outside. My IAT was 82-90f from start to finish.

[DrivenAgain]

Originally Posted by AngryInch

My DA is not good, because of elevation, but my IAT is almost the same as yours… it was only 15c outside. My IAT was 82-90f from start to finish.

My IAT started at 65f. The ECU can only advance timing to stay within a safe range, your 94 octane is limiting that advance, although 15deg at top of 5th is great! You're also still on Map2 which is a conservative 93oct file. Youre on par for a pump gas car.

[AngryInch]

I think I figured out/understand now how guys are running e30+. I keep thinking in terms of AFR and stoichmetric, however, the ecu uses lambda. So the ecu is targeting lambda values regardless of the fuel. Lambda 1 is 14.7:1 with pump gas, which is a complete burn. If e30 is used, ecu will add fuel to reach lambda 1, which is a complete burn of that fuel and a different stoichmetric value, likely closure to 13:1…

I think what was screwing me up is the JB4 reads out in AFR, which is actually a conversion of ecu lamdba readings. Lamdba 1 of e30 is not 14.7:1.


Is 44 the max fuel trims on our cars? What I don’t get is how a CEL isn’t popped for maxing out fuel trims… usually 25% increase will pop a code for too rich on most ecus.

I’m going to get some e85 and mix it up to e30, let it adapt and run some logs to see the timing and trims.

[AngryInch]

Well I’m not having much luck here. My fastest time was JB4 with pump gas and stock exhaust.

Now with DPs, and mixing e98r with 94 pump to make e30, I’m even slower, I lost a couple mph in 1/8 and 1/4… damn. Timing doesn’t look much better.

Wish there was actual tunes for the 21s.. It feels like it’s pulling in 4th and 5th but has a bit of a hesitation… not perfectly smooth.

Think I might just run it with pump 94 and leave it alone till someone cracks the ecu.

[pbonsalb]

For those mods you probably need a custom map. If you are running Map 2 on the JB4, it probably is not the best choice.

[brad65ford]

Originally Posted by AngryInch

Well I’m not having much luck here. My fastest time was JB4 with pump gas and stock exhaust.

Now with DPs, and mixing e98r with 94 pump to make e30, I’m even slower, I lost a couple mph in 1/8 and 1/4… damn. Timing doesn’t look much better.

Wish there was actual tunes for the 21s.. It feels like it’s pulling in 4th and 5th but has a bit of a hesitation… not perfectly smooth.

Think I might just run it with pump 94 and leave it alone till someone cracks the ecu.

Did you send Jerry your logs? Curious what he has to say in this regards. I wouldn't give up yet, your car is new could be something going on with the jB4.

[DrivenAgain]

Originally Posted by AngryInch

Well I’m not having much luck here. My fastest time was JB4 with pump gas and stock exhaust.

Now with DPs, and mixing e98r with 94 pump to make e30, I’m even slower, I lost a couple mph in 1/8 and 1/4… damn. Timing doesn’t look much better.

Wish there was actual tunes for the 21s.. It feels like it’s pulling in 4th and 5th but has a bit of a hesitation… not perfectly smooth.

Think I might just run it with pump 94 and leave it alone till someone cracks the ecu.

Send me your logs jason@charisrealty.com

[AngryInch]

Originally Posted by brad65ford

Did you send Jerry your logs? Curious what he has to say in this regards. I wouldn't give up yet, your car is new could be something going on with the jB4.

Ya I have been sending him stuff constantly. He replies quickly. He says the logs look ok and fine typically.

I’ve notice my boost is a bit higher since dps. However, when the boost is higher, the timing drops more as well.

[AngryInch]

So I will keep this going as my log of how things are going for my mods. If anyone else has similar issues please chime in.

I’ve been reading over past logs and noticed before downpipes boost was around 18-20 psi ecu.. Now after downpipes, the ecu is calling for 20-22psi, I’m seeing a rise in ecu calling of around 2psi…

Anyone know why the ecu would be calling for more psi? I’m running JB4 map 2 so it’s adding 4.4psi, I’m hitting 25-26psi which is quite high and likely why my timing is not the best.

[AngryInch]

Air is good this morning. So I did some testing… I turned down the JB4 to map 1 since the boost was way too high on map 2, causing my timing to take a beating.

Way way better. Gained 2mph in 1/4 and did a 10.48 spinning all 4 tires through 1st gear.

Not sure why the factory tune and ecu started calling for more boost, but it has been up 2 psi since downpipes. So JB4 users really need to keep an eye on their ecu boost and select the proper map. For me with comp package, downpipes. Map 1 works better snd keeps my throttle boost at around 23-24, which lets the timing come up to where it should be.

I’ll need 100octane race gas to run map 2… which I have and will try later on.

Next mod, Dinan inlets. Arrived today, will install shortly and report back if any improvements with draggy.

[brad65ford]

smart move

[eric97hoh]

Originally Posted by AngryInch

Air is good this morning. So I did some testing… I turned down the JB4 to map 1 since the boost was way too high on map 2, causing my timing to take a beating.

Way way better. Gained 2mph in 1/4 and did a 10.48 spinning all 4 tires through 1st gear.

Not sure why the factory tune and ecu started calling for more boost, but it has been up 2 psi since downpipes. So JB4 users really need to keep an eye on their ecu boost and select the proper map. For me with comp package, downpipes. Map 1 works better snd keeps my throttle boost at around 23-24, which lets the timing come up to where it should be.

I’ll need 100octane race gas to run map 2… which I have and will try later on.

Next mod, Dinan inlets. Arrived today, will install shortly and report back if any improvements with draggy.

those dinan turbo inlets will defiantly help you more air better temps and just use jb4 map 1 if your finding success with it I have had jb4 and its all trial and error there is really no perfection

[brad65ford]

looking forward in seeing if the inlets make a difference! Excited to see results!!!

[eric97hoh]

Originally Posted by brad65ford

looking forward in seeing if the inlets make a difference! Excited to see results!!!

heard they make a bit better noise throttle response and some power we shall see tho

[AngryInch]

Map 1, Catless DPs, E30 mix, drop in filters. Spinning through first gear.

[brad65ford]

good time!!!

[eric97hoh]

Originally Posted by AngryInch

Map 1, Catless DPs, E30 mix, drop in filters. Spinning through first gear.

what drop in filters do you have you deleted the charcoal filters too right?