G40 boost preasure

[si polo coupe]

Im glad this tread is going. Wanted to ask about my boost
Mods on engine.
Rebuilt r1 2k ago, 51mm polished throttle body, ported polished gt inlet, 65mm psd phase1 toothies, 1341cc, pace intercooler with minium bends, lightend & balenced bottom end, psd uprated injectors, sns stage 5 chip, light porting and polished head. Etc.  Mine hits 20-21 psi on my digital glow shift gauge, at 7k is that about right.

[hayesey]

that sounds way off to me!  assuming that you're talking about the normal g40 charger and you've not fitted a g60, then I'd be surprised if it was making more than 13-14psi.  Things like 51mm TB, GT inlet will actually reduce the boost pressure you see on a gauge because more air is going into the engine.

it can't be making 21psi with a g40 g-lader.

[si polo coupe]

Yea g40 r1. Ive been told its high but cant understand why its reading that high.

[hayesey]

I'd try a different gauge

[SuperMario]

I'd try a different gauge

x2  sounds whey to high for the spec

[z3i]

De wedged throttle, 65mm pulley, standard charger new vee belts, unknown chip and mine makes 10psi at 7k?
i see some people are getting around 15 psi with the same mods?
would a worn charger cause that much drop as i dont know when it was last serviced

[PeteG40]

you wont get that high with a stock charger...  you'd get 0.8 bar max... comparable to about 1bar 1.1bar with a fully ported unit

[z3i]

Ah, thanks for that. has put my mind at ease, thought the charger was on its way out and in need of a rebuild
i didnt realize a fully ported made so much difference
thanks mate