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Old 04-01-2009, 02:07 PM   #1
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Default CrankingPW,Accel enrichment+fuel pressure

Hi,

Stupid questions but I really want to do this right

I swapped my 1.6l injectors (230cc) to 305cc. I also swapped Vortech FPR to Fuelab AFPR. Questions:

- MSPNP manual says that I need to change at least Req_fuel, accel enrichment and cranking pw settings. Req_fuel and Cranking pw are easy to do with calculator but what do I need to do with accel enrichment:
-Which is better, tps or map based, I don't have AFM anymore.
-Do i just need to change Value on tps-based, not Rate ? :O


If i rise the base fuel pressure 3bar (~43psi), to 4 bar (~58psi) It of course change the results. Is it this way :

3 bar = 305cc
4 bar = 352cc (+15,5%)

So I need to do accel enrichment and cranking pw settings according to that 352cc ?
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Old 04-01-2009, 02:20 PM   #2
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REQ_FUEL:

305s = 32.6% larger

if REQ_FUEL = 13.2
then new REQ_FUEL = 9.9 (33% less)


Cranking:


New Cranking PW = (Old PW - 1) / % change + 1

example:

40*C = 8.3

(8.3 - 1) / 1.33 + 1 = 6.5

rinse and repeat.



Enrichments:


should stay close, going to have to tweak as you go.
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Old 04-01-2009, 03:22 PM   #3
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So with my newb math it should go this way:

REQ_FUEL

352cc (305cc with 4 bar pressure) vs 230 = 53% larger

if REQ_FUEL = 13.2
then new REQ_FUEL = 6.2 (53% less)

Cranking

New Cranking PW = (Old PW - 1) / % change + 1

example:

40*C = 8.3

(8.3 - 1) / 1.53 + 1 = 5.8

rinse and repeat.

Enrichments:

should stay close, going to have to tweak as you go.

Confirm this and I'll be happy
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Old 04-01-2009, 03:31 PM   #4
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that's probably how I'd do it. I'm running 10psi more fuel pressure than stock. I left my req_fuel alone and just touched my cranking PWs, same injectors.
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Old 04-01-2009, 03:34 PM   #5
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Thank you for the replies =) You're the master
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Old 04-01-2009, 03:42 PM   #6
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nah. i know a little bit of everything. not that useful.
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