4G63 Question

[rs97eclipse1695]

i was just wondering what do the factory 4G63s run PSI wise?...I WANT ONE!!! but i just have to deal with what i have till i graduate...not that i mind.....i love the looks i get....most are like this one>>

[Shpyder]

2Gs are 7-8 psi stock i think.


(PS, use the search button before RST blows his turbo on ya)

[TsiTalon9587]

Originally Posted by Shpyder

2Gs are 7-8 psi stock i think.


(PS, use the search button before RST blows his turbo on ya)

Umm, Ironically you might want.....nevermind.

2g's boost roughly 14 or so stock.

[viet_boiiiii]

Umm.. i think its 10-11 stock out from factory and UP to 14 til it blows.

[rs97eclipse1695]

ok so somewhere between 7-14...haha sorry i didnt think of searching....the question just kind of hit me and i posted as fast as i could...ever had one of them moments? anyways...thanks for the replayb but anyone know for sure??

[Shpyder]

Originally Posted by TsiTalon9587

Umm, Ironically you might want.....nevermind.

2g's boost roughly 14 or so stock.

Stock 2G turbo boost without an mbc is 14? Someone said 8-9 or something, which is why u need to up it when u get an MBC. Or is that just to control spikes etc?? I was doing 9 psi when i got a boost guage before an mbc. then a leak maybe?

[Raz_Kaz]

1st gen 8-12psi
2nd gen 10-15psi


5$ please

[TsiTalon9587]

Originally Posted by Raz_Kaz

1st gen 8-12psi
2nd gen 10-15psi


5$ please

Thank you.

Originally Posted by viet_boiiiii

Umm.. i think its 10-11 stock out from factory and UP to 14 til it blows.

A T-25 has this capability?

[gsxeclipse97]

14 stock from factory and it can boost up to 20 i still have a stock turbo; blows up ....

[BoostedSpyder]

my stock BCS was running 15 with the BCS restrictor removed... but not to redline... t-toosmall...

look up the BCS restrictor removal on the VFAQ...

[kjewer1]

It seems there are 2 numbers poeple are quoting. WG sping rating, and actual boost set by the ECU and Boost Control Solenoid (an EBC of sorts).

1g - Spring pressure is ~10 psi, stock boost is ~11
2g - Spring pressure is ~7 psi, stock boost is ~14

15 psi on a 2g with the BSCR removed sounds just about right. With a 1g BOV it would spike to ~18 psi in my case. I could hold 15 to redline, but no more. So set to 20 psi, it would still drop above 5500 rpm, to 15 psi ultimately. Most poeple seem to hold less, but I spent ridiculous amounts of time checking for boost leaks. On a turbo thats already maxed out, a small boost leak can have a large effect on performance. At the same time, do you think a 2 lb/min boost leak has much of an effect on my current 74 lb/min turbo running at 64 lbs? Doesnt even notice it. On the T25, I picked up .5 seconds in the quarter fixing those leaks But now I'm rambling...

[JoeWagon]

Also, the T25 doesn't blow up at 15psi. Myself and others I know have run 21+psi at the track, and because I was tired of people saying "don't go over 16psi" I tried it on pump gas too. One of my talon's ran 9psi, whether it was a boost leak, faulty BCS, or the stock BOV... that's what it was.