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      10-30-2021, 01:50 PM   #1
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TUNING The New BMW M3 Competition

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      10-30-2021, 02:32 PM   #2
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Quote:
Originally Posted by WickedBMW View Post
Just a Racechip not a real tune.. video is very misleading. I'd recommend Jb4 over racechip
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      10-31-2021, 10:07 AM   #3
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Quote:
Originally Posted by NKGK20 View Post
Just a Racechip not a real tune.. video is very misleading. I'd recommend Jb4 over racechip
I have the race chip on my M4 and it's a great tune. Im very happy with it.

I will upgrade to the JB4 to take advantage of the E85 map. But other than that the Race Chip has been great.
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      11-01-2021, 12:17 PM   #4
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I dont see why you cant just add e85 to race chip car. Stock torque limits are in place.
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      11-01-2021, 12:45 PM   #5
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RaceChip doesn't have CANbus or EWG control so it's like running a JB4 with only 2 out of its 5 connection points attached. I get why someone might buy RaceChip for their Honda Civic or Kia but will never understand why someone with a $80k car would purchase one.
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      11-01-2021, 01:57 PM   #6
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Quote:
Originally Posted by PLife View Post
I dont see why you cant just add e85 to race chip car. Stock torque limits are in place.
Had a racechip in my x3mc. Was doing about 3 gallons of E85 .. had no issues
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      11-04-2021, 09:42 AM   #7
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Quote:
Originally Posted by PLife View Post
I dont see why you cant just add e85 to race chip car. Stock torque limits are in place.
You can add E85 to the race chip but won't gets much power increase as you are keeping boost the same. Racechip does not have E85 maps with a higher boost levels than their basic 91/93 maps.

Jb4 maps
Map 1: Default performance map, 3psi peak request over stock (suitable for all 91+ RM2 fuels)
Map 2: 4psi peak request over stock (91 -93 suggested)
Map 3: 22psi absolute boost target (93 - E30 suggested)
Map 4: 23psi absolute boost target (E30-E40 suggested)
Map 5: 25psi absolute boost target (E30-E40 suggested)

the jb4 will allow you to get a few more psi when you have E85

Quote:
Originally Posted by LongBeachDinanFan View Post
RaceChip doesn't have CANbus or EWG control so it's like running a JB4 with only 2 out of its 5 connection points attached. I get why someone might buy RaceChip for their Honda Civic or Kia but will never understand why someone with a $80k car would purchase one.
Its adds a lot of power and its reliable with no issues.
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      11-04-2021, 02:23 PM   #8
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Quote:
Originally Posted by mike@x-ph.com View Post
You can add E85 to the race chip but won't gets much power increase as you are keeping boost the same. Racechip does not have E85 maps with a higher boost levels than their basic 91/93 maps.

Jb4 maps
Map 1: Default performance map, 3psi peak request over stock (suitable for all 91+ RM2 fuels)
Map 2: 4psi peak request over stock (91 -93 suggested)
Map 3: 22psi absolute boost target (93 - E30 suggested)
Map 4: 23psi absolute boost target (E30-E40 suggested)
Map 5: 25psi absolute boost target (E30-E40 suggested)

the jb4 will allow you to get a few more psi when you have E85



Its adds a lot of power and its reliable with no issues.
I disagree. On the same map (even stock) adding a few gal E85 makes a BIG difference. Like 1/2 sec 60-130. Car recognizes octane and adds timing and higher trims. Same boost
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      11-04-2021, 02:45 PM   #9
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Quote:
Originally Posted by PLife View Post
I disagree. On the same map (even stock) adding a few gal E85 makes a BIG difference. Like 1/2 sec 60-130. Car recognizes octane and adds timing and higher trims. Same boost
Since your boost is the same so you are leaving power on the table
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      11-04-2021, 04:23 PM   #10
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Quote:
Originally Posted by mike@x-ph.com View Post
Since your boost is the same so you are leaving power on the table
Also disagree. Because the stock torque limiter is in place if you crank up the boost the car will close the throttle body and pull power. Diminishing returns with more boost after you achieve max torque per gear. Max tq for comp is 620 ftlb and for the manual its 540. Ive done over 200 pulls with logs. Multiple people are running my maps and doing dragy. Logs are consistent with the numbers.

The best bang for the buck after you are flirting with torque limits is higher octane unless you have a flash. My friend has a stock g82 and added e25 blend he said it feels tuned
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      11-04-2021, 05:09 PM   #11
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The race chip is fun in the street, but its put me in limp mode 3x on track for hitting tq limit.

Guys in Germany tell me to dial back to map 6 since the car is hitting tq limit.

Without addressing tq limits its kinda moot.

With 250 track miles a month on my car I am wary of finding the weak link in the chain.

Ill let someone else run a russian ecu on track for a year before I go full tune. By then I should be a decent driver in the car.
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      11-04-2021, 07:17 PM   #12
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Quote:
Originally Posted by PLife View Post
Also disagree. Because the stock torque limiter is in place if you crank up the boost the car will close the throttle body and pull power. Diminishing returns with more boost after you achieve max torque per gear. Max tq for comp is 620 ftlb and for the manual its 540. Ive done over 200 pulls with logs. Multiple people are running my maps and doing dragy. Logs are consistent with the numbers.

The best bang for the buck after you are flirting with torque limits is higher octane unless you have a flash. My friend has a stock g82 and added e25 blend he said it feels tuned
Im glad your friend "feels" it's tuned, but that does not mean much, unfortunately.

I said i recommend the JB4 if you are using E85 to take advantage of the extra power. You disagreed and then went on about stock car + e85 and throttle closure.

I don't disagree with anything you said, but it has nothing to do with my statement.

the Jb4 takes advantage of the higher E85 octane and adds boost and make more power than on 91 / 93 octane ( a lot more power than your friend with his stock map and E85 fuel)
Are you saying that the statement in bold is wrong and the jb4 does not make more power with E85 than your friend's stock + e85?

Here is a dyno with Jb4 and E85, please have your friend post a dyno of his stock car with E85
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      11-05-2021, 05:37 AM   #13
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Quote:
Originally Posted by mike@x-ph.com View Post
Im glad your friend "feels" it's tuned, but that does not mean much, unfortunately.

I said i recommend the JB4 if you are using E85 to take advantage of the extra power. You disagreed and then went on about stock car + e85 and throttle closure.

I don't disagree with anything you said, but it has nothing to do with my statement.

the Jb4 takes advantage of the higher E85 octane and adds boost and make more power than on 91 / 93 octane ( a lot more power than your friend with his stock map and E85 fuel)
Are you saying that the statement in bold is wrong and the jb4 does not make more power with E85 than your friend's stock + e85?

Here is a dyno with Jb4 and E85, please have your friend post a dyno of his stock car with E85
Hi Mike. I have logs and data. Same map, same boost target, same measured actual boost from the turbos. Different gas. More timing and higher fuel trims instantly. Higher calculated torque in the logs instantly. 60-130 improvements over 0.5 sec. back to back pulls before and after gas. Im not going to argue over this i have so much data its not even funny. Will do 60-130 when able on the stock car before and after addition of e25. Its gonna make a measurable difference, guaranteed. These new ecus add alot of power once they see higher octane. Gas is one of the most important mods for these cars.
I should make a youtube video about it.
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      11-05-2021, 08:57 AM   #14
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Quote:
Originally Posted by PLife View Post
Hi Mike. I have logs and data. Same map, same boost target, same measured actual boost from the turbos. Different gas. More timing and higher fuel trims instantly. Higher calculated torque in the logs instantly. 60-130 improvements over 0.5 sec. back to back pulls before and after gas. Im not going to argue over this i have so much data its not even funny. Will do 60-130 when able on the stock car before and after addition of e25. Its gonna make a measurable difference, guaranteed. These new ecus add alot of power once they see higher octane. Gas is one of the most important mods for these cars.
I should make a youtube video about it.
I agree with you.

When you add more octane, there is room for higher timing and more power. You said you have logs showing the ECU does this automatically, and I won't argue with the data.

What I'm saying has nothing to do with timing. With E85, the Jb4 can push more boost and make more power.

The two statements are not mutually exclusive.
  1. you can make more power but only adding E85 and having the ECU adjust automatically
  2. you can make more power by getting a jb4 and upgrading to E85
  3. the power you make with a Jb4 and E85 is more than the power you'll make with stock and E85. Both are more power than stock on 91 or 93

In summary, I do not disagree with anything you said, and what you said does not contradict my post about the Jb4 and E85
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      11-05-2021, 01:11 PM   #15
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Quote:
Originally Posted by mike@x-ph.com View Post
I agree with you.

When you add more octane, there is room for higher timing and more power. You said you have logs showing the ECU does this automatically, and I won't argue with the data.

What I'm saying has nothing to do with timing. With E85, the Jb4 can push more boost and make more power.

The two statements are not mutually exclusive.
  1. you can make more power but only adding E85 and having the ECU adjust automatically
  2. you can make more power by getting a jb4 and upgrading to E85
  3. the power you make with a Jb4 and E85 is more than the power you'll make with stock and E85. Both are more power than stock on 91 or 93

In summary, I do not disagree with anything you said, and what you said does not contradict my post about the Jb4 and E85
Lets have a beer lol
Makes sense
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      11-05-2021, 01:13 PM   #16
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Quote:
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Lets have a beer lol
Makes sense
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      11-25-2021, 03:30 PM   #17
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Interesting thread. How much E-85 can you add to a stock engine running on 91 octane to get a performance increase that's noticeable? And, is there 'too much'?
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      11-26-2021, 08:15 PM   #18
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Quote:
Originally Posted by vetteflier View Post
Interesting thread. How much E-85 can you add to a stock engine running on 91 octane to get a performance increase that's noticeable? And, is there 'too much'?
According to the owner's manual, "Fuels with a maximum ethanol content of 25%, may be used for refueling".

Which I think means that if you want 25% in your tank, you would have to have 12.5gal of 91oct (w/ e10) and then fill it up with e85 (no more than 3.1 gal). Then again, last time I did algebra was in high school
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Last edited by GixY2K; 11-26-2021 at 08:30 PM..
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      11-26-2021, 09:18 PM   #19
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Quote:
Originally Posted by GixY2K View Post
Quote:
Originally Posted by vetteflier View Post
Interesting thread. How much E-85 can you add to a stock engine running on 91 octane to get a performance increase that's noticeable? And, is there 'too much'?
According to the owner's manual, "Fuels with a maximum ethanol content of 25%, may be used for refueling".

Which I think means that if you want 25% in your tank, you would have to have 12.5gal of 91oct (w/ e10) and then fill it up with e85 (no more than 3.1 gal). Then again, last time I did algebra was in high school
Damn I've only been putting in 1 gallon.

Gonna test this out tomorrow.
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      11-27-2021, 05:10 PM   #20
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Thanx, Gix. Will see what Trentmeister says. But worth considering.
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