retune after fuel pump upgrade???

[avinesh]

Does the tune go totaly out after upgrading to a more powefull fuel pump...lets say 20l/h more??? Pump specs old 279l/h vs new 300l/h both at same psi an volts....

[Lloyd]

Shouldn't make any difference what fuel pump you're running as long as its supplying enough to maintain the rail pressure you've tuned the computer for

[cat007]

Shouldn't make any difference what fuel pump you're running as long as its supplying enough to maintain the rail pressure you've tuned the computer for

Agree'd - except - you might find at the top end you'll run richer as the bigger pump will be able to maintain said rail pressure all through the rev range

Best thing to do - go to a dyno day and see what the A/R's are at up high

[Jebus]

What kind of pumps? if you go from a good 280 pump to a junk 300l/h it might give a lean spot coming on boost if the pump cant provide pressure fast enough.

[avinesh]

What kind of pumps? if you go from a good 280 pump to a junk 300l/h it might give a lean spot coming on boost if the pump cant provide pressure fast enough.

From a nismo to a bosch 044....put it on dyno today afr was the same but car was down on power from 400kw down to the 360's the tuner said it was 10degres on the day it made 400wkw an today it was 15 degrees an also he said im running smaller tyres now which have caused it to cover less ground or sumthing like that....what do you guys recon???

[avinesh]

anyone???