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RD28 Fuel adjustments.
Posted: Wed Jan 13, 2010 5:34 pm
by adriand82
Gday, I have a GQ with the 2.8, 120ks, has custom dump pipe and boost has been set to 14psi. I was wondering what a safe amount of fuel can be added via the screw at the back of the pump, maybe a quarter of a turn? Also what are the advantages of changing the fuel adjuster under the compensator plate? I had a 4.2 and was comfortable with adjusting fuel on that, but can't seem to find any exact info on this little temperamental motor.
Posted: Thu Jan 14, 2010 9:27 am
by 8maddog8
I did mine by just turning it up a little bit at a time, about an 1/8th until i was happy with it.
Took it for a run after each tune to check the EGT's and see if it was blowing black smoke.
Originally i probably turn it up about a 1/4 of a turn, and then after i fitted the intercooler i turned it up another 1/4. The temps remained good (under 500) and only blew a bit of black smoke around idle.
Posted: Thu Jan 14, 2010 3:27 pm
by adriand82
How much of a difference was noticed in power after it was turned up 1/4?
Posted: Fri Jan 15, 2010 9:17 am
by 8maddog8
Both times i turned the fuel up it made a significant different. Boost comes on a lot quicker, and turbo response is a lot better (the little thing screams its head off now
)
It also gave it more power down low and a lot better performance through the revs.
Its a lot better than in its stock form.
I wouldnt hesitate to do it again.
Have fun
