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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 01-06-2012, 11:51 AM   #1
Vic328CSi
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Installing bigger injectors before tune

Hi guys, I have 24lb/hr injectors in my supercharged 328 currently, and I want to swap them out for 42lb/hr FiveO injectors I just recieved, havent done it yet. Ive also swapped out the stock fuel pump for a walbro 255lph.

I have a shop that will do the tune for it. My question is, will I be ok installing the new injectors and driving the car gently to the tune shop about 15 miles away? The new injectors are quite a bit larger than what its replacing, i dont want to flood my cylinders with gas.

Comments, suggestions appreciated!

Vic
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Old 01-06-2012, 12:42 PM   #2
hassmaschine
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the max fuel trim is somewhere around 15-20%.. your new injectors are almost twice as large as stock. No, that's not going to work.
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Old 01-06-2012, 01:03 PM   #3
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I would do all that work, and get it towed to the shop. Clearly it's much cheaper to get towed, than let the shop do that install.




Good luck.
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Old 01-06-2012, 01:42 PM   #4
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What's driving your need for larger injectors - you upping the boost?
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Old 01-06-2012, 06:06 PM   #5
Vic328CSi
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I would do all that work, and get it towed to the shop. Clearly it's much cheaper to get towed, than let the shop do that install.




Good luck.
yep trying to do the install myself since its a simple job, think ill just tow it.

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Originally Posted by TxZHP04 View Post
What's driving your need for larger injectors - you upping the boost?
did a dyno, running very very lean dont think the injectors are keeping up, been advised I need 38-42lb for the power im making/trying to make. look at my afr, also lack of proper tune.

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Old 01-06-2012, 11:13 PM   #6
midnighttuning
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Quote:
Originally Posted by Vic328CSi View Post
Hi guys, I have 24lb/hr injectors in my supercharged 328 currently, and I want to swap them out for 42lb/hr FiveO injectors I just recieved, havent done it yet. Ive also swapped out the stock fuel pump for a walbro 255lph.

I have a shop that will do the tune for it. My question is, will I be ok installing the new injectors and driving the car gently to the tune shop about 15 miles away? The new injectors are quite a bit larger than what its replacing, i dont want to flood my cylinders with gas.

Comments, suggestions appreciated!

Vic
3 options

1. Get a tow

2. Decrease fuel pressure for the trip with a aftermarket FPR, then set back to stock PSI.

Cheers
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Old 01-07-2012, 08:19 AM   #7
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3. Install bigger injectors when you get to the shop - (seems like the easiest option unless I am missing something?)
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Old 01-07-2012, 11:58 AM   #8
Vic328CSi
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3. Install bigger injectors when you get to the shop - (seems like the easiest option unless I am missing something?)

now why didnt i think of that! lol
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Old 01-07-2012, 04:14 PM   #9
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now why didnt i think of that! lol
lol - don't worry i'm sure you would have thought of that at some point.
Good luck with the tuning BTW
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Old 01-08-2012, 07:38 AM   #10
Terrence328T
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hi guys, did you drop the compression to fit the sc. i just turbocharged my 328 running lean aswel
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