Devil Man said:i dont see the difference... i mean 20psi is 20psi which ever way you look at it. isnt it? sure one might be more efficent and boost earlier but isnt a measurement of air the same not matter the source?
Devil Man said:i dont see the difference... i mean 20psi is 20psi which ever way you look at it. isnt it? sure one might be more efficent and boost earlier but isnt a measurement of air the same not matter the source?
Devil Man said:i dont see the difference... i mean 20psi is 20psi which ever way you look at it. isnt it? sure one might be more efficent and boost earlier but isnt a measurement of air the same not matter the source?
Tonymac said:In a way you're right. Strictly in terms of the compressor being larger and more efficient, an engine shouldn't make more/less power at a given psi. But you're talking about completely different turbos w/ completely different turbines. See, an engine is an air pump. The more efficiently an engine operates as an air pump, the more power it will make (air in/air out). Now think about the turbine side of GT4x vs that of a t2x. No formal education is needed to know the GT4x has a much larger turbine side and will most likely create much less back-preassure. To make sense of it, a larger turbine will exhibit a lower pressure ratio which means lower turbine inlet pressure (TIP) - back-preassure. So even though the intake manifold pressure levels are the same, the engine will be able to move a greater mass of air in and out.
Thats what I plan on doing with my rb20. Run a better turbo at like 12 psi and make way over the stockish 215 whp.mmm now if this was the case then, would you run lower boost to get the same hp at the end?
gaehrings14 said:Im running a slightly larger turbo than that and it spools up real quick (KA 2.4l), I have it at 9lbs not even close to its effeciency range.... Last time I was at the dyno I made 280 hp and 266 tq. Tuned with a safc... 480cc injectors. Ka's last pretty long just as long as there isn't any detonation the pistons can't take much (ringlands). I've had my car running for a long time running 9lbs before untuned at 12:7 for like 5 months making a crappy 185hp, Tuned it for like 20min on the dyno and got 256hp, then I went like two weeks ago and we took our time and got 280hp.
There was a guy with a sr20det much nicer setup but with a stock turbo boosting 14lbs and he was getting around 245-256 hp. He ran home and put on a fpr.. I don't know why lol and he made his car run crappier. If he had a larger turbo running 14lbs he would make much better power, a 60-1 will spool pretty good on a 2.0 or a 2.4..... Even on a 1.8 honda motor. I dunno I have worked on and driven a lot of different setups and im suprised at how some of these smaller motors spool these bigger turbo's.
I guess it really depends on how much hp you want to make you can only go so far with a small turbo until it becomes a hot air pump causing detonation.
Devil Man said:mmm now if this was the case then, would you run lower boost to get the same hp at the end?