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Old 01-18-2009, 03:50 AM   #1
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Default Prepping to swap in 460's

I'm reading up to make sure I get the steps right on what to do to swap from my current fuel setup (stock injectors & Vortech FPR) to the RX7 460's that I bought and had cleaned/flowed. I'd like to ask you guys if I understand the MSPNP instructions on this correctly.
Seems that I need to do the following:
In REQ_FUEL set injectors flow to 460cc and change air-fuel ratio to 12.7:1
Do the math and scale all the cells in the Cranking PW and the Accel Enrich PW
Disconnect Vortech FPR
Re-tune to get A/F's golden with the new injectors

Am I missing anything?

On a side note, I'm removing the AFM too and so then I'll have to load the 90-93 without AFM map in MS once I do so... am I correct that this will put me back to a completely base tune and back to default settings in MS? Is there any way to carry over my VE tables and all other settings etc. to the no-AFM version? I'm hoping I don't have to completely redo things like set the MS back up to communicate with my wideband (AEM) and read in A/F instead of volts, etc...

Thanks guys
-Ryan
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Old 01-18-2009, 07:00 AM   #2
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changing the configuratior takes a whole min tops right?

Changing req fuel takes another min tops, so far your looking at two min.

If you want to, you could import your old fuel/timing tables as well to save some time. But the changes from the vortech FPR to not will need to be re tuned anyways. I would start with the base msq, make your changes needed, VTPS? WB02? 4 bar map sensor? After the changes are made, re tune and be good.
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Old 01-18-2009, 12:54 PM   #3
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Quote:
Originally Posted by ThePass View Post
In REQ_FUEL set injectors flow to 460cc and change air-fuel ratio to 12.7:1
Too complicated. Just divide the size of your old injectors by the size of your new injectors (230/460=0.5) and then multiply your current Req_Fuel number by 0.5.
Quote:
Do the math and scale all the cells in the Cranking PW and the Accel Enrich PW
Those will be close, but not dead-on. The absolute pulsewidths, to my knowledge, do not take into account the lag times. So you'll have to factor that it after you scale 'em. You're gonna have to re-tweak 'em anyway, so it's not important to be dead-on the first time.

Quote:
Is there any way to carry over my VE tables and all other settings etc. to the no-AFM version?
For every individual table, you can do an Export Table function which will generate a .VEX file. You can them Import that file into the new MSQ.

Quote:
I'm hoping I don't have to completely redo things like set the MS back up to communicate with my wideband (AEM) and read in A/F instead of volts, etc...
I presume you're using an MSPNP, and their default software config has seperate project directories for every setting. So yeah, you'll need to make those fixes in the new (without AFM) project folder.
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Old 01-18-2009, 01:15 PM   #4
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Make sure to put some oil on your o-rings on the injectors when you install. Breaking one because it isnt oiled is a bitch.
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Old 01-18-2009, 01:37 PM   #5
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Quote:
Originally Posted by Joe Perez View Post
The absolute pulsewidths, to my knowledge, do not take into account the lag times. So you'll have to factor that it after you scale 'em. You're gonna have to re-tweak 'em anyway, so it's not important to be dead-on the first time.

so you take account.

230/460 = .5

say 60*F = 4.5ms

remove 1ms, then multiply by the difference, then add the 1ms back. (it takes .5ms to open and another .5 to close)

so a 4.5ms would now be 2.75ms
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Old 01-18-2009, 04:57 PM   #6
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Quote:
Originally Posted by Joe Perez View Post
Too complicated. Just divide the size of your old injectors by the size of your new injectors (230/460=0.5) and then multiply your current Req_Fuel number by 0.5.
The MSPNP manual says to just set the injector flow to whatever injectors you are puting in and to change the a/f from the normal 14.7:1 to 12.7:1 just because they found that works better... seems fairly un-complicated.. Why would I not enter 460 in that box? Multiplying my current number in there (230) by 0.5 would get me 145... why would I put that in the injector flow box if I have 460's? Maybe I'm misunderstanding...
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Old 01-18-2009, 06:11 PM   #7
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REQ_FUEL = 13.7

13.7 * .5 = 6.7


the end.



OR



input 1600cc
460cc
12.7AFR
then get 6.7....
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