Is this Safe??

[boost12dsm]

Yes I just bought a GST and it has 580cc Injectors, 255 Fuel pump, AFC, front mount, super 16 turbo and I was woundering if it is safe to be running 18 psi?? The guy I bought the car fron says it fine but I wanna make sure and also what is the max boost a stock 4g63 can handle..?? thanks guys im new to the whole DSM thing so bare with me!! I use to have a stage 4 wrx but this stuff is alot diffrent!!

 

[LA97GST]

That is a very good setup you bought. If it is tuned right you should have no problems. I have seen 1g's running 24 psi on the stock motor. 18 is the most i would go maybe 20. But that super 16g isn't the best turbo. I hear bad things about Hahn's turbo. You might think of upgrading to a 50 trim or even an EVO 3. Just my .02.

 

[thegreatms]

did you get a datalogger? That would be the best think to tell you if it is safe or not. You should have one at that level of mods. I would turn down the boost to be safe until you get some kind of logging device.

 

[boost12dsm]

No I dont have a data logger or anything but he had an A/F guage in the car and when you floor it the light does not even move out of green at all... I know that the guage is kinda inacurate because it runs off a narrow band O2 but its gotta be some what right so I guess the car is running really rich intel I get it tuned friday??? and the turgo thats on there he told me is a super 16 with a 20 G wheel on it?? I have no idea what he meant and I dont think he did eather ??

 

[thegreatms]

Your right the A/F is very inaccurate because it is narrow band. It usually is used only for very general ideas how how your car is reacting to your fuel adjustment. I would get a logger, and start doing alot of reading on this site, as well as the other 2 or 3 sites out there for dsm's. You'll find tons of info, it will take months before you start getting a real grasp on all the in's and out's of dsm's. But i guess its better to have infomation overload than no info at all. Here is a good place to start:

http://1000q.dsm.org/

also check out:

http://www.vfaq.com/index-main.html
http://www.dsm.org/

 

[ichiban_dsm]

Asking how much boost a dsm can handle is not a very good question, there are lots of factors to take into account like altitude, air temp, what is exactly done to the car, race gas. You can safely run 22-24 psi where i live but thats taking into account all the stuff i mentioned. On your setup things look really good if you had a logger i would think you could once or twice turn it upto 20psi but 18psi looks really good. I have seen lots of dsms run nearly 30psi with stock 7bolt motors other than arp head bolts and head gaskets. So it varies

 

[bigj91talon]

what should you be looking for on the logger to see if boost it ok? I run 19 lbs on a big 16g ported with a supra fuel pump, 450 ccs, and an open stock downpipe, the air fuel guage stays about 3 bars away from total richness.

 

[steveVR4]

Look at knock and timing advance.