opinions

[bstdtimsp]

I decided that i dont want to build my motor so I'm wondering if i had theses mods on a stock block how would it work.

Ported exhst mani
pg intake mani single runner
corksport s pipe
gt28 turbo
vibrant exhaust
corksport fmic
corksport radiator
spec stage 2 clutch
welded lsd
unichip custom tune
wrx 440 injectors

Thats the new list of current or mods need to be added could this be safe for a daily driver at 9 psi?

 

[Matrix]

Upgrade the spark plugs and go a stage colder.

Keep in mind that 9psi on a GT28 is different from 9psi on the stock T25.

 

[bstdtimsp]

of course! i need to get a new turbo soon so im thinking a gt25 ported and upgraded gt28 wheel with that set up at 9 psi custom tune.

 

[fr0st]

i dont get it.. i asked that question about the plugs a month ago and at 9 psi they told me to stay with stock hat range..

why would you want to go colder with a GT28 ?

 

[bstdtimsp]

i dont get it.. i asked that question about the plugs a month ago and at 9 psi they told me to stay with stock hat range..

why would you want to go colder with a GT28 ?

i believe its due to the increase in airflow from upgrading to a bigger turbo

 

[K. Soze]

I've been hearing a lot of spark plug debate lately. I'm going to stay with my stock heat range when I start tuning this spring. If for some reason a little detonation starts, I'll try a step colder. However, I've heard that it is not entirely necessary.

 

[BOOSTR]

The 6 series plugs are fine at that psi and more. Don't believe me, put some in for a while and then pull them out and look at them. If your engine is otherwise okay you will not see any issues on them.

 

[bstdtimsp]

i want to have good performance like around 230 whp plus be albe to drive it to work every day

 

[Noel]

whats the difference between a gt28 9 psi and a t25 9 psi? I hear alot of talk about this and I dont get it 9 psi is 9 psi any way you look at it

 

[bstdtimsp]

whats the difference between a gt28 9 psi and a t25 9 psi? I hear alot of talk about this and I dont get it 9 psi is 9 psi any way you look at it

its the air mass which is the difference plus the turbo's spool at different times and hit peak boost at different times aswell gt25 has more low end power and gt28 has more high end power.

 

[Noel]

so is 9psi more powerful with the 28 than the 25?

 

[geomatics_tech]

so is 9psi more powerful with the 28 than the 25?

yes, there is more volume.

 

[fr0st]

so is 9psi more powerful with the 28 than the 25?

the flow is way bigger at the same psi..

 

[Noel]

I dont understand that, pounds per square inch (psi) is the force that air is applying to a certain area in this case a square inch. if you increase your turbo size ie. from 25 to a 28 the psi is still going to be the same. This value doesnt change just because you have a bigger turbo housing. 1psi = 1psi either way you slice it. its the mass air force being applied. Also your psi reading would read the amount of air being forced into the intake. If you have more 'flow' you have more pressure.

 

[bstdtimsp]

I dont understand that, pounds per square inch (psi) is the force that air is applying to a certain area in this case a square inch. if you increase your turbo size ie. from 25 to a 28 the psi is still going to be the same. This value doesnt change just because you have a bigger turbo housing. 1psi = 1psi either way you slice it. its the mass air force being applied. Also your psi reading would read the amount of air being forced into the intake. If you have more 'flow' you have more pressure.

ok here we go let try to break this down for you. 14.7 lbs/mercury of atmospheric pressure is the ideal level for a na motor at sea level. once you go above or below that ammount changes which in hand reduces the performance of your viechle. The reason turbocharged and supercharged performance came about trying to reach the optimal level of constant 14.7/lbs at levels above or below sea level. I get what your saying that 9psi is 9psi and that is correct but 9si with a gt25 and 9si with a gt28 is different. A boost guage measures psi of suction not mass airflow into the engine. Have you ever seen a flow chart? That indicates how much air a turbo flow at a certian boost level. It would be like you have a smaller straw and blowing into vs a larger straw no matter how hard you blow the bigger straw will flow more air just based on the size difference. It is no different with turbo's.

 

[bstdtimsp]

check these graphs out http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT25/GT2560R_466541_1.htm gt25 and gt28rs http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT28/GT2860RS_739548_1.htm you should be able to see the difference

 

[Noel]

aahhh now I get it , thanks and good straw analogy that really makes sense now and thanks for the links now I can understand this alot better

 

[S.A.MSP]

the bigger the turbo the more HP/psi, simple!

 

[bstdtimsp]

the bigger the turbo the more HP/psi, simple!

not ecaxtly alot of different things go into a bigger turbo and im sure your aware of that but other people are not

 

[S.A.MSP]

lol, yeah i know, it was just a simple quick answer which is half correct.