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Old 03-10-2008, 07:37 PM   #1 (permalink)
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Default Injector wizard ???

I am running the DW750's and I plan on installing the EMS soon. Just a quick question.... I want to run my FPR at 50psi with my 750, but how do I set the EMS for that?

The injector wizard asks for the old injector size and then PSI, and then it asks for the new injector size and PSI.

The map I have downloaded already has the RC750's (DW750's are the same, right), so how do I set what FP I am running?

Thank you!!!!!!!!!
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Old 03-10-2008, 07:40 PM   #2 (permalink)
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DW750's? i thought you traded with bpsrt4 for RC750's?
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Old 03-10-2008, 07:44 PM   #3 (permalink)
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Long story, but I ended up purchasing NEW DW750's, so now I needed to sell my DW650's but I just did that about 10 minutes ago.
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Old 03-10-2008, 09:29 PM   #4 (permalink)
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right click on the fuel map. go down to change and enter new and old fuel pressure. problem solved
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Old 03-11-2008, 07:25 AM   #5 (permalink)
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So i'd enter Old fuel injector size 750 Old psi 43.5 New fuel injector size 750 new fuel pressure 50.0 ????????? Or should I enter what the 750's flow at 50psi of fuel pressure as the injector size??? See what I mean?
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Old 03-11-2008, 11:49 AM   #6 (permalink)
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Quote: Originally Posted by mebcop View Post
So i'd enter Old fuel injector size 750 Old psi 43.5 New fuel injector size 750 new fuel pressure 50.0 ????????? Or should I enter what the 750's flow at 50psi of fuel pressure as the injector size??? See what I mean?

Enter stock injector size and pressure: 527cc@58psi, enter new injector size and the pressure that they rate them at.
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Old 03-11-2008, 11:53 AM   #7 (permalink)
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Quote: Originally Posted by mrj82 View Post
Enter stock injector size and pressure: 527cc@58psi, enter new injector size and the pressure that they rate them at.

I understand that's how you change from stock to 750's at 43psi, but I'm trying to change from 750's at 43psi to 750's at 50psi....
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Old 03-11-2008, 11:56 AM   #8 (permalink)
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Old 03-11-2008, 12:02 PM   #9 (permalink)
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So i'd just enter 750's at 43.5psi for old injectors and 804's at 50psi for new injectors..... is that what you're saying rrmike?
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Old 03-11-2008, 12:19 PM   #10 (permalink)
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I'm sorry. A 750cc injector @ 43psi becomes an 804cc injector @ 50psi. Go to the bottom of this page where it says "fuel pressure modification":
Fuel Injector Calculator from WitchHunter Performance

Just for shits and giggles, that 750cc injector becomes 866cc@ our stock fuel pressure. OMG!!
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Old 03-11-2008, 03:25 PM   #11 (permalink)
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Quote: Originally Posted by mebcop View Post
I understand that's how you change from stock to 750's at 43psi, but I'm trying to change from 750's at 43psi to 750's at 50psi....

I understand what your saying but, you don't have the ems installed yet. Your going to have to use some base map, in which case if you use the stock base map that comes with the ems enter what I said. Keep in mind the stock base map was made on a stock car with stock injectors, so you wanna let the ems know the previous injectors on the map are the 527cc@58psi injectors that come with the car. Just enter your 750cc injectors and the pressure your running. Keep in mind even doing all of this your afr is going to be all over the place. Your still going to have to tune it(I'm sure you know this).
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Old 03-11-2008, 06:39 PM   #12 (permalink)
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Thank you.... That's exactly what I was asking!!! I actually have two different 50 trim maps that I can use to start with, but I don't know if they were using 43psi on their 750's or not.... guess I'll have to ask them so I know what to enter as my old Fuel Pressure.
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Old 03-11-2008, 08:20 PM   #13 (permalink)
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Quote: Originally Posted by mebcop View Post
Thank you.... That's exactly what I was asking!!! I actually have two different 50 trim maps that I can use to start with, but I don't know if they were using 43psi on their 750's or not.... guess I'll have to ask them so I know what to enter as my old Fuel Pressure.


Odds are they are using 43psi with a 1:1 fpr with a vacuum source connected. Either way it goes I really don't think its gonna matter. There will still be alot of tunning involved just to get it to idle/cruise around 14.7. Get a friend to drive your car in vacuum while you tune on it. Its easier then you think but it will take you some time to figure things out. The first week I had mine I got 8mpg .
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Old 03-11-2008, 09:47 PM   #14 (permalink)
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There is alot too do and Im still half lost but am slowly getting the hang of it.
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Old 03-12-2008, 05:41 AM   #15 (permalink)
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wait a second....the ems isnt installed yet? why would you worry about anything yet lol
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