unsure of a safe PSI level

[Turbo Monk3y]

although ive been running this setup ( you can check my current mods) for a few weeks now im still unsure of a safe PSI level i can run .. i have just been running it at 13- 14 psi on my 16g i was wondering if i could just go up one more to 15 and then just stop there until i get more supporting mods. i only run 93 octane in this car and im at 1800 ft above sea level if that helps any.. oh yeah when i have my car at 10 psi and raise it up to 14 i really dont notice any difference in fact i think since i got a bigger turbo it almost feels like im stressing my engine becuause i dont have exhaust nor bigger intercooler piping its really weird but as for everything else the car runs fine everything is tuned up and i get good gas mileage.

 

[L2RTSiAWD]

with no fuel pump or exhaust or anything I would keep it under 15psi.

 

[madmax]

You upgraded your turbo before your intercooler piping? Damn dude, your probably not noticing a difference because your just blowing hot air at higher boost. Do you have the stock intercooler?

 

[2GStreeT]

Can someone please explain why a turbo will blow hot air?

 

[OMN_DSM]

Originally posted by madmax
You upgraded your turbo before your intercooler piping? Damn dude, your probably not noticing a difference because your just blowing hot air at higher boost. Do you have the stock intercooler?

Huh? If anything he will be blowing cooler air than the T-25.

You need to upgrade alot of other stuff before you start messing anymore with the boost. Get some IC pipes, exhaust, some fuel mods and somthing to keep it all working together. Good luck!

Mike

 

[tallywacker]

a turbo spins at 15,000 rpm+- depending on turbo, boost, settings, blah blah anyways that produces heat as well as the turbo being bolted onto the exhaust manifold and all the hot exhaust flowing through the exhaust side of the turbo. take a look at this on your eclipse, at night go out and rip your car around for acouple mins then pop the hood the turbo glows from so much heat.

 

[Turbo Monk3y]

actually MADMAX you are very right about that one THE only difference in my car now is boost stays till redline, about 3800 rpm turbo lag instead of 3000 and i dont get the small Torque pull in 1st or 2nd anymore. all in all I JUST NEED TO get all the supporting mods to make it run more effecient.

 

[OMN_DSM]

Originally posted by tallywacker
a turbo spins at 15,000 rpm+- depending on turbo, boost, settings, blah blah anyways that produces heat as well as the turbo being bolted onto the exhaust manifold and all the hot exhaust flowing through the exhaust side of the turbo. take a look at this on your eclipse, at night go out and rip your car around for acouple mins then pop the hood the turbo glows from so much heat.

I understand this but the original comment was that he is probably just blowing hot air at higher boost, when he is actually blowing cooler air at high boost than the T-25 would. I just want to make it clear so the unknowing dosen't read the thread and think that a bigger turbo is going to blow warmer air, because thats what I got for the comment.

Mike

 

[Enigma_Man]

Originally posted by tallywacker
a turbo spins at 15,000 rpm+- depending on turbo, boost, settings, blah blah anyways that produces heat as well as the turbo being bolted onto the exhaust manifold and all the hot exhaust flowing through the exhaust side of the turbo. take a look at this on your eclipse, at night go out and rip your car around for acouple mins then pop the hood the turbo glows from so much heat.

A turbo can actually spin up to 150,000 rpm. I think you left out a digit

-Jesse

 

[greyforestgst]

Originally posted by tallywacker
a turbo spins at 15,000 rpm+- depending on turbo, boost, settings, blah blah anyways that produces heat as well as the turbo being bolted onto the exhaust manifold and all the hot exhaust flowing through the exhaust side of the turbo. take a look at this on your eclipse, at night go out and rip your car around for acouple mins then pop the hood the turbo glows from so much heat.

turbos spool in the upwards of 100,000 rpms
turbos only glow orange when egt's get extremely high, and are not cooled with engine braking (like you should!!)

the guy does need to upgrade his crappy i/c plumbing, but he will still yield a gain over the t25.

 

[Defiant]

Originally posted by 2GStreeT
Can someone please explain why a turbo will blow hot air?

"Heat" is from molecules in motion bumping into one another. In a gas, you have a quantity of molecules bouncing around in a given area. If you take that gas and force it into a smaller area, the molecules have less room to move around and will bump into each other more often.
When you run air through a turbocharger compressor, you're cramping the air molecules closer together, so the temperature goes up- on a DSM and similarly-sized engines, it raises the temps by something on the order of a couple of hundred degrees.
The intercooler gives some of that heat a chance to escape, by having the hot air run though small tubes with a lot of surface area. Heat wants to move from hot places to cool places, so the metal of the intercooler soaks up some of the heat, and the air on the outside of the intercooler soaks up some of that as it passes by.
Air conditioning works just about backwards from this, in that you are allowing a fluid whose boiling temperature is well below room temperature soak up heat from the air in the car: the refrigerant transforms from liquid state to gas (just like boiling water, you have to add heat to it to make it boil and turn to steam and vapor) in the passenger compartment evaporator, then goes back to the AC compressor to be crushed back into hot vapor, then in the condensor on the front of your radiator it's cooled enough to return to a liquid and on in to the receiver and back again to the evaporator.

 

[madmax]

Originally posted by OMN_DSM


Huh? If anything he will be blowing cooler air than the T-25.

You need to upgrade alot of other stuff before you start messing anymore with the boost. Get some IC pipes, exhaust, some fuel mods and somthing to keep it all working together. Good luck!

Mike

I know this. My point was that with the 16G and no supporting mods, turning up the boost isn't going to do any good. The fact that the 16G is more efficient than the T-25 isn't the point. The point is, without any suporting mods, no matter what turbo he's running, cranking up boost after a certain point is useless.

 

[herostar]

get yourself a full exhaust and some intercooler pipes, then leave it about 14-15 psi until you get an upgraded fuel system.

 

[pneumo]

The stock 2G BOV won't hold any more than 11 psi. That's why there is no power increase above that. Get a new BOV, the 1G BOV works fine, and get a new UICP to go with it. That should be good for 14 psi. Then do the exhaust, then the fuel pump. That should be good for 16 psi.

 

[rebuilt65]

The upgrade path's that have been established on this website have been working for me so far. Check them out at the home page. Right now I have a mix of 300 and 400 horsepower( mostly exaust and EVO parts) parts. Exhaust flow, intake flow, and fuel are always the priorities. Some people play it same and have the fuel system done first to accomodate future performance mods. Keep the boost in a safe range until you decide how you will monitor what is going on in the engine datalogger etc...
FUEL, FUEL and FUEL control will keep you from melting it down.
Regards
Rebuilt65

 

[Turbonium]

hye so engine breaking cools a turbo??? i had never heard this myself can someone explain to me exactly how this works??? i guess you would be putting air through it that hasn't been heated by combustion...is tis al it is or soemhting else? someone explain this to me i'm sure some other people would like to know also, thanks
Ryan

 

[tallywacker]

yeah im sorry i wasnt thinking hehe i was tired when i posted

 

[greyforestgst]

try it when you get an egt

cruise along the highway in 5th at 70mph. your egts should be hovering around 700 deg C. when you get to an offramp, downshift to third and let the engine wind down from 5000rpms without putting any gas on it. if you let the engine do most of the work, you'll dip down to around 400.

i only do this after its been running hard and is shooting hot egts.

 

[Turbonium]

i always downshift anywayz so i guess my turbo must be having a good life? idk i was just wondering why it would cool it i guess it makes sense that it's gonna move sooler air through the turbo, i don't have an egt gauge so i've never had a chance to look thanks for the info though,
Ryan