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[Ian_D]

i didnt think it would i aint going to waste £100 on a bosch 4 bar reg to try it

Ive got a brand new 4.0 Bar Reg sat doing nothing, still in its sealed packet! I cant decide if I should
A) Sell it
or
B) fit it!

The 3.8's were fitted to the 2.6 vecs, so I assume they were fitted to the 2.6 and 3.2 omegas? And I know that the 3.8's are a LOT cheaper than the 4.0 Bar Regs.  

[Kevin Wood]

not sure bigger fpr is necessary for Omega, as the flowrate of the injectors is not a restriction.

Correct. Upping the fuel pressure will simply cause the ECU to trim the fuel back to compensate. Total waste of money unless you have already tuned the engine to the point where the injectors are running out of flow. I can't see that happening until you've made extensive modifications elsewhere, not just a chip change.

Kevin