BIGGER is BETTER!!! A FAQ on the Bosch 550cc injectors for R53

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Was getting on the freeway today so i logged the 06 MCS running E85, here are the results (car is only putting down 227whp on a dynojet with Bosch OE 550s and MegaMINI cam running E85 fuel).

Note the "1st shaded yellow area", at one point, these 550s are maxxed out in 2nd gear at 7125rpm, duty-cycle was at 100%.



Note the "2nd shaded green area", the injector duty was at 83% in 3rd gear at 6500rpm.



So yeah, the 550s may sound like they are big injectors, the above data clearly indicate that they are getting maxxed out. So if we were to make more than 230whp on a Dynojet, then we will indeed go even BIGGER than the 550s on the injectors.

 

Injector spray patterns (Stock, 380cc, Bosch OE 550cc, RMW 440cc)

This video was taken by 1320MINI in the UK, documenting the spray pattern of the various MINI R53 Fuel Injectors. The injectors are lined up as such (in order from LEFT to RIGHT):

1) Stock S injector;
2) JCW 380 injector;
3) Bosch OE 550 injector sold by Mynes & 1320MINI;
4) RMW '440s' - 2nd generation SRT ones

[ame=http://www.youtube.com/watch?v=TTwAWSyJRfM]YouTube - 330_380_550_440.MTS[/ame]

 

440s and a variety of eBay 550s being tested...

Edited by Nathan - Contains NSFW Language

This 2nd video shows the following injectors (from LEFT to Right):
1) RMW 440s (2nd Gen SRT ones)
2) Hubie 550s (drilled out) = these had been decommissioned in 2009 and replaced by the Bosch OE 550s.
3) Five-O eBay "drilled out" 550s
4) Five-O eBay 380s

[ame=http://www.youtube.com/watch?v=QUsBu5wRkHs]YouTube - The ones not to use 440_550MM_five-0.MTS[/ame]

 

OE Bosch 550s on UK Pump gas, 1320MINI Tune using FA53

Ok, found a recent log from Thomas Awesome tune, btw

Car made 213whp on the Mustang Dyno (1320Tuned using FA53, Bosch OE 550, Newman Cam and 15% pulley).

Note:
1. Knock Retard (in yellow) are "0"s across the board.
2. Ignition timing per cylinder (purple) are dead even on all 4's
3. Injector duty cycle at 75% (in red) with a boost pressure of 15.8 at 7,000 RPM.



Will post more logs up as i find them... just need more time in the day :arf:

 

DataLog from a 2006 BONE Stock S Auto.

We had a 2006 MCS-Auto convertible on the dyno yesterday, 100% FACTORY STOCK... It put down 133whp on a DynoJet. With some minor touches, got it to 141whp. Didn't want to push it too much b/c the injectors were already at 88% duty cycle at 6473 RPM at 10.8psi... See the 'red column'...

So for people running with 15% or smaller pulleys, your boost level is probably at around 14 Lbs and your injectors are way maxxed out

 

JCW Injectors with V1 header, 15% pulley + Schrick cam

Here is another example of Injector Duty Cycle (IDC): 2005 MCS with 380JCW injectors (V1 header with 15% pulley and Schrick cam) - IDC at 111% at 7200rpm.

 

People give out advice on how you can "safely" do this mod and that mod w/o adding parts etc etc... that's the beauty of the forum. But all this anecdotal advice on the forum is fine and dandy until something happens; then people start pointing finger on "oh what happened"?

We (Mynes) are different in many regards. We publish actual data and our finding. If a customer comes to me asked for my advice, then i will provide my opinion based on our findings and provide those info to the customer as well. We never hard sell our product to anybody.

I'm not saying anything on what people should or shouldn't do to their MINIs; i'm merely presenting the actual DATA that's been spit out of the MINI ECU is showing. You can decide on what you want to do with this information as you please.

It's like going to see the doctor and s/he shows you charts about your high cholesterol level. You can argue with the doc and say "i've been eating this way for 50 years and i'm still alive and well so i don't want to change anything." So can the doc force you to do anything? Most likely not. But when the day comes, just don't act surprise

The information presented above merely shows this: at higher rpm's, your injectors are maxxed out (85% to 90% IDC is considered working overtime). Now if you don't ever run your mini in that rpm range, then you should be fine. But just keep in mind when you do rev it to that range, your injectors are running pretty hard and MIGHT be a potential point of failure.

Here is the same JCW MINI-S at a lower rpm range (keep in mind, this is only in 2nd Gear. So imagine the car in 4th or 5th gear at that rpm with the increased load, the IDC would even be higher):

 

it's not a pull on the dyno, it's a log from a customer's race mini.

FYI, i take my 06 all the way to 7800rpm in 1st; 2nd gear all the way to 8,000rpm for no reason at all simply b/c i can

Just me...