B20Vtec setup question

[RobNL]

Hi Guys

Since a week ago ive swapped mine b16a2 for an b20vtec engine in my EK4

Setup:

B16a2 manifold + OEM TB
240 cc injectors
ITR 98 spec head
B20B stock block
OEM B20 headgasket
OEM EK9 header
Tanabe Med. touring 2"38 inch catback
OEM EK9 Flywheel
Exedy stage 1 clutch
p06 chipped ecu (Vtec @ 4400 @ 55% Throttle pos.)
Innovative 75A steel motormounts

She pulls well from 2500 till 6500. After 6500 she get problems due to the small injectors (@7500 there working @ 95% of their duty cycle) and map sensor reads -0.4 -0.6 bar @ 6800 rpm.

Now i know the plenum of the manifold is small for the b20.
But im just looking for a little more pull and a little more fuel from the injectors (310cc ) to let her hit 7800/8000 rpm.

Whats the best way to achieve this goal?

greetings

 

[Vtec6000]

Larger injectors or get a adjustable fuel reg and increase fuel pressure in a bid to try reach the desired fuelling.

 

[civic4g]

Don't think the problem is the intake manifold, maybe you can use a slightly bigger TB but that's it, keep the manifold. Focus in increasing fuel delivery and re-tune.

 

[RobNL]

will do!

what kinda size do u recommend?

62
65
or 68mm?

Don't think the problem is the intake manifold, maybe you can use a slightly bigger TB but that's it, keep the manifold. Focus in increasing fuel delivery and re-tune.