12psi stock motor and head

[jd420a1995]

well thay say 420a you cant run 12psi on stock motor and head not true i have done it dial in your fuel rigth and go with a mls head gasket from dealer the motor will take it 12psi should hold you untill the next step more boots if you have more then 100,000 miles on your car change Pistons rings too i started out with 9psi 12psi is like nigth and day

 

[VelocitàPaola]

well thay say 420a you cant run 12psi on stock motor and head not true i have done it dial in your fuel rigth and go with a mls head gasket from dealer the motor will take it 12psi should hold you untill the next step more boots if you have more then 100,000 miles on your car change Pistons rings too i started out with 9psi 12psi is like nigth and day

Who said you can't? WTF

 

[jd420a1995]

before i went turbo every one i talk to said i would blow my car up with more then 8psi i said what the hell ill try it if it blows it blows my afrs looked to good not to try it

 

[VelocitàPaola]

before i went turbo every one i talk to said i would blow my car up with more then 8psi i said what the hell ill try it if it blows it blows my afrs looked to good not to try it

I'm not sure who "every one [sic]" is, but there's no reason you shouldn't be able to go beyond 8psi on a stock motor... awddynamite did. Besides, pressure without flow rate is a meaningless measure. A GT60 at 8psi is a very different turbocharger than a GT12 at 8psi.

 

[talon740]

what setup is that? ive been looking for a good setup for mine, that will work with stock motor and head... and any internals done also??

 

[Locke]

The ~8psi limit that everybody talks about is not a limit of the engine, rather the crappy low-buck fuel systems most people tend to use when they first boost their 420a.

 

[rstchris]

That 8psi rule is a reliability thing. That is the pressure that most people don't pass cause it gets dangerous. You can keep the ringlands from splitting if you flood the car with fuel and have that huge intercooler but even a sniff of detonation will crack those brittle pistons. Some have boosted 16psi with good fuel managment on a stock 420a. When you boost beond the "safe zone" it's not a question of "IF" it will blow, but "WHEN". My old 420a handeled 10psi for 9 months.

 

[jd420a1995]

i feel you but when you put out money on your car to make it fast sometime you have to grow some balls to see what it do i feel like sometime making a fast car is like driving no one can show you you have to lean the steps to do it is cool but every car dozn't trun out the same so far what i have seen i can say doing a 420a turbo is well worth it im just like the rest of 420a crew doing what g463 owers say is a wast of time im very happy as a 420a turbo ower if someone ask me if thay should turbo a 420a i would say HELL YEAH

 

[96TurboGS]

With the shallow pistons and rods we have, having a turbo flow at around 300chp or over that amount is the same as playing Russian roulette. It only takes one boost spike to ruin a tuners dream.

 

[rstchris]

I understand you as well, I blew mine up at 10psi so I did a build with a clutch, new trans, pistons, rods, crank, head gasket, the whole 9yds. Then ran 20psi with a MS. I'm just trying to express a "safe zone" and if he has money he can ride the line til' upgrade time.

 

[jd420a1995]

im with you bro i know that 20psi feels good im working on it real soon

 

[Mike431635]

I LOVE the BBS RS's, very classy. You pull it off well.

Just curious, why don't you clock your compressor down, run shorter route piping from the compressor outlet towards the passenger side of the car and connect it to the passenger side of the IC that way? You would eliminate a bunch of piping, get a cleaner look, and cut your lag down some. Not that it's bad with that setup, but just making an observation

 

[gene420a]

can you boost 7 pounds to a completly stock 420a without hurting anything

 

[LD25Delta9]

can you boost 7 pounds to a completly stock 420a without hurting anything

No. Pending on what your grounds for "completly stock" are. You have to upgrade the fuel system in order to boost a 420a. If you follow the basic Walbro and 12:1 FMU, the the most you boost you can squeeze out of a "brand X" turbo with stock injectors is 8psi. Sorry I'm OCD.

 

[Locke]

The ~8psi limit that everybody talks about is not a limit of the engine, rather the crappy low-buck fuel systems most people tend to use when they first boost their 420a.

That 8psi rule is a reliability thing. That is the pressure that most people don't pass cause it gets dangerous. You can keep the ringlands from splitting if you flood the car with fuel and have that huge intercooler but even a sniff of detonation will crack those brittle pistons. Some have boosted 16psi with good fuel managment on a stock 420a. When you boost beond the "safe zone" it's not a question of "IF" it will blow, but "WHEN". My old 420a handeled 10psi for 9 months.

It's only a reliability thing with the 12:1/255HP/235cc combination fuel system. The fuel pump cannot supply enough fuel at the pressures requested of it beyond 8psi; It is on the edge of too lean at 8psi.