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 ?

 

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.

 

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

 

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.

 

Thank you for the replies =) You're the master

 

nah. i know a little bit of everything. not that useful.