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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Dyno #'s PRE and POST Dinan Stage II



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      03-19-2009, 05:49 AM   #23
Bubbles
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Quote:
Originally Posted by Lotus99 View Post
Bubbles, you having the Dinan already, are those A/F numbers normal? Any concerns or comments on them?

OP, pls. let us know what you hear back on that.

Enjoy it!
Dinan runs rich but his AFRs are a bit off, it should stay around 11:1-12:1 in the high RPM range. His fuel pump may be failing which could explain the dip and strange AFRs.

OP are you experiencing MPG loss? A failing fuel pump does not atomize fuel correctly which reduces MPG and HP.
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      03-19-2009, 06:39 AM   #24
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What sucks is that its a $2000 mod that you can't resell.
+1. I have seen someguys switched from Dinan to V3 or JB3. they couldn't even get $100 back from initial $2000 that they spent!!
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      03-19-2009, 06:51 AM   #25
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Quote:
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+1. I have seen someguys switched from Dinan to V3 or JB3. they couldn't even get $100 back from initial $2000 that they spent!!
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      03-19-2009, 08:01 AM   #26
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Quote:
Originally Posted by Soni View Post
+1. I have seen someguys switched from Dinan to V3 or JB3. they couldn't even get $100 back from initial $2000 that they spent!!
Thanks captain obvious! When you buy the flash, they tell you it's NOT transferrable...move on.
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      03-19-2009, 10:49 AM   #27
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Quote:
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What sucks is that its a $2000 mod that you can't resell.
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Originally Posted by Soni View Post
+1. I have seen someguys switched from Dinan to V3 or JB3. they couldn't even get $100 back from initial $2000 that they spent!!
Honestly, I wouldn't take a chance without a warranty in this car. I've already had $15k worth of warranty repairs on my car... nothing due to tuning, but just bad parts. All paid for by Dinan. And I personally know of 3 e9x's, 2 of whom are on this board, that have had their warranties voided in full due to either PROcede or JB3. And you can't say they were stupid because they didn't take their tunes out, because 2 of the 3 did and still got busted with codes we didn't know about back then... and now there are BT readers to delete the codes, but what else do we NOT know... back then, we thought those piggybacks were invisible...
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      03-19-2009, 11:09 AM   #28
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Quote:
Originally Posted by Stage 2 Drew View Post
IMO thats a total waste of money.

hope your happy with it though...
Quote:
Originally Posted by CaptainDang View Post
What sucks is that its a $2000 mod that you can't resell.
Quote:
Originally Posted by Soni View Post
+1. I have seen someguys switched from Dinan to V3 or JB3. they couldn't even get $100 back from initial $2000 that they spent!!
Quote:
Originally Posted by GAMEOVR View Post
What Skim said. Why don't you guys piggyback each other on outta here, you're not helping. To the OP, you should send the dyno results to Dinan. They should be assisting you too.
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      03-19-2009, 11:35 AM   #29
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Quote:
Originally Posted by Bubbles View Post
Dinan runs rich but his AFRs are a bit off, it should stay around 11:1-12:1 in the high RPM range. His fuel pump may be failing which could explain the dip and strange AFRs.

OP are you experiencing MPG loss? A failing fuel pump does not atomize fuel correctly which reduces MPG and HP.

Ya, that's what I'm figuring....but strangely I haven't noticed a real dip in MPG.....

but the car did feel more powerful immediately after the flash...it was also a LOT colder then, so it's hard to say whether it's temp related or not.....
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      03-19-2009, 11:48 AM   #30
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but the car did feel more powerful immediately after the flash...it was also a LOT colder then, so it's hard to say whether it's temp related or not.....
If what was temp related? The lull, mpg, or power?
BTW, great data!!
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      03-19-2009, 12:04 PM   #31
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An AFR that rich just can't be good for the car either.
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      03-19-2009, 12:21 PM   #32
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There's nothing risky about running the car that rich under boost. Just a waste of fuel/mpg.

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      03-19-2009, 12:37 PM   #33
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This is what Dinan had to say in an earlier thread about why the Dinan tune runs richer. The question is whether the OP's results are too rich.

Quote:
Originally Posted by Steve.breen@dinan View Post
Thanks for the comparison graphs, Kelvin.

The Dinan tune runs richer than the JB3 and stock because it's necessary to run a richer mixture when increasing boost. As you increase cylinder pressure by adding boost, the mixture needs to be richened for a couple reasons. The first is to reduce detonation, a side effect of increased cylinder pressure. Incidentally, the reason why the JB3 power curve is so lumpy is because the knock control system is actively pulling timing back in order to save the engine from detonation. The second reason for a richer mixture is to reduce piston crown temperature and catalytic converter temperature to ensure long-term durability.

Our tech article titled "Safety Strategies for a BMW Turbo Control System" is a good resource for more information:

http://www.dinancars.com/bmw/technial-info
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      03-19-2009, 01:38 PM   #34
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The other thing that you guys should realize is that

1.) I still have Cats
2.) The AFR measurement was taken from the tailpipe, and only ONE at that. So, the measurement itself isn't entirely accurate.

Anyways, I thought I should mention that......

Chime away!
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      03-19-2009, 02:22 PM   #35
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Quote:
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There's nothing risky about running the car that rich under boost. Just a waste of fuel/mpg.

Shiv
Cylinder washdown if it gets reaaalllyy rich.
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      03-19-2009, 02:33 PM   #36
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Cylinder washdown if it gets reaaalllyy rich.
Not when you only run rich under boost. Washdown is only an issue if it runs excessively rich at idle, cruise, etc,.

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      03-19-2009, 02:58 PM   #37
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Quote:
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If what was temp related? The lull, mpg, or power?
BTW, great data!!
power I was talking about....

and thanks!
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      03-19-2009, 03:00 PM   #38
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Quote:
Originally Posted by Soni View Post
+1. I have seen someguys switched from Dinan to V3 or JB3. they couldn't even get $100 back from initial $2000 that they spent!!


true, but I have no intention of trying to get rid of it anyway, and I hope to keep this car for a long time, God willing.....
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      03-19-2009, 04:04 PM   #39
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That seems a little low, I gained 63hp and 78 ft lbs. on a Mustang AWD dyno. Original stage 2 flash. I can still get 27+ mpg too, and I drive fast.
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      03-19-2009, 04:08 PM   #40
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Quote:
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IMO thats a total waste of money.

hope your happy with it though...
Just wait until something blows up and Dinan covers everything. I've seen Juiceboxes blow holes in motors.
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      03-19-2009, 04:11 PM   #41
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That seems a little low, I gained 63hp and 78 ft lbs. on a Mustang AWD dyno. Original stage 2 flash. I can still get 27+ mpg too, and I drive fast.
Really? Any other mods?

Holy Shizzle thats a lot......Same dyno before and after? Do you have your charts?
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      03-19-2009, 04:15 PM   #42
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No other mods. All my charts are on here, videos of lag and max boost levels with mine. Go back and look at some of my old treads. Probably around March/April 08. I have had zero problems with the car (19k miles) Still runs like a champ and has nice power delivery.
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      03-19-2009, 04:20 PM   #43
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http://www.e90post.com/forums/showthread.php?t=133625

here.
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      03-19-2009, 05:11 PM   #44
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Quote:
Originally Posted by shiv@vishnu View Post
Not when you only run rich under boost. Washdown is only an issue if it runs excessively rich at idle, cruise, etc,.

Shiv

There still is being raw gas dumped into the oil system. Fuel dilution in Oil will serverly reduce its lubrication ability... increasing wear especially if extended oil change intervals are used.
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