4g91 Top Speed 140km/j

[81maniac81]

Hi All...

Can Anybody help me.. My car use 4g91 injection.. Top Speed 140km/j.. Usually standard 4g91 is 180km/j. My plug colour is white.. That's mean fuel not enough support.. How can i solve this problem.. it's make me headache. Anyone can help me please...

 

[LittleWhiteWagon]

Fuel pump?

 

[81maniac81]

Last time i'm using Carburator tank with 4g91 carb head.. Also top speed only 140km/j. Now already use injection. Tank also have change to injection tank. The top speed also 140km/j.

 

[N/A secret]

Upgrade fuel pump, buy fuel pressure regulator. Maybe you have some problems with ur exhaust system setup?

 

[81maniac81]

Fuel pump already Change 2x, fuel pressure regulator already add on. the reading is 3.5. Exhaust system is 2 inches. Start from manifold until muffler.

 

[DanzEterna]

what is your car setup?

---------- Post added at 10:08 AM ---------- 6 hour anti-bump limit - Previous post was at 10:07 AM ----------

Fuel pump already Change 2x, fuel pressure regulator already add on. the reading is 3.5. Exhaust system is 2 inches. Start from manifold until muffler.

now wonder la, change back your piping to std or 1.65".

 

[81maniac81]

Are you sure the problem come from piping?

 

[^pomen_GTR^]

try play2 with your cam angel sensor setting... (distributor position)

try advance a bit or retard a bit...