omarisramo

hope i dont threadjack, but i plan on using a 6665 turbo with a ram horn manifold and ID1000's or maybe even bosch 1200, but with a walbro 255. should i upgrade. ideally i'd like to see something above 400whp around 8-14psi.

s2kt3

dyno numbers below with different set ups with list of upgrades .......


http://www.ultimate-racing.com/Produ...TurboKit.shtml

s2kt3

Im not sure if you read above.... I will have fully built head, lowered compression, I'll get to 450whp no problem... this exact same turbo I mean exact I did 406 AWHP @ 17psi on my 2.0l sti....rwhp is much easier to get .....not 33% drive train loss like awd set up....

s2kt3

OEM

herecomesboost

Ah! Dynojet numbers. Makes sense now

TonysMI4

s2kt3

Either way it's a street car and only will see 425whp at redline, which is not very often, so really the numbers are useless, because my turbo isn't huge, it will be streetable...

Thanks for the input!

Lee

s2kt3

question, about the back pressure..... you got me thinking ....... there is only going to be serious pressure in there when I am at full load and full boost.... however when I am at full boost my wastegate is fully open allowing excess pressure to vent, preventing the turbo to spool over the desired amount.... so what back pressure are you talking about??? because from the theory Im thinking about there isnt really any backed up pressure....just air going to the turbine and air leaving the manifold right when it enters..........

clarification is needed ..

thanks

-Lee

hybridsol

question, about the back pressure..... you got me thinking ....... there is only going to be serious pressure in there when I am at full load and full boost.... however when I am at full boost my wastegate is fully open allowing excess pressure to vent, preventing the turbo to spool over the desired amount.... so what back pressure are you talking about??? because from the theory Im thinking about there isnt really any backed up pressure....just air going to the turbine and air leaving the manifold right when it enters..........

clarification is needed ..

thanks

-Lee
[/quote]

At max boost, turbine inlet pressure is usually equal to or greater than boost (compressor) pressure. So that 25 psi is on the exhaust side too... between the exhuast and the turbo- Google "turbo turbine inlet pressure"

s2kt3

I understand that, but pressure is lazy, wants the path of least resistance...... the manifold is so small and the opening (wastegate) is so big, I just cant see there being pressure in there, at least not more then is needed to make the turbo spool at 18 psi, once it gets there, it dumps excess gases (pressure)

talked to my tuner last night, he KEEPS saying 450 is sooooo easy to hit with this kit...... on a dyno jet blah blah blah

wierd !

-Lee