lets say you wanted to run a .48 a/r on the hot side to spool crazy fast...this will obviously mean you will lose out on the max hp, so you turn up the boost a notch right? will this theoretically work? essentially there is no more load on the engine...just load sooner on.

just a guess of an example--->
60trim garret with .63 exhaust a/r @ 10psi makes 200hp max and spools by 5300rpm
60trim garret with .48 exhaust a/r @ 14psi makes 200hp max and spools by 4800rpm

basically, can i make up for a low exhaust A/R ratio by turning up the boost?

 

yeah you can . . . . I don't think you will lose out on butt loads of power, but hey you will have the power sooner with the .48 a/r if that's what you are going for. I opted for the .63 a/r just for the extra power, and to be able tp kinda upgrade in the future in terms of if I decide to build my motor and what not, but both are great choices

 

It would seem that that would be fine and would make more sense than buying a bigger turbo.

 

It would depend. Every setup has a limiting factor.

Say you have a .63 A/R turbo and are safely tuned up to 15psi and have determined that is the maximum safe level. A .48 A/R turbo will not affect that. You will not be able to turn up the boost a notch safely.

I guess my point is: Thr A/R of the turbine housing has no effect on the limiting factor.

Just stuff to think about.

 

whether it would "theoretically" work or not, its a horrible idea to actually use.


i would never put that mush money and time on a "hypothesis's" i would rather put it on facts...

just get a wb.

 

The smaller turbine will restrict your exhaust side, hold in more heat and pressure which leaves you prone to detonation sooner, and the engine doesn't breathe well since the Turbine Inlet Pressure to Intake Manifold Pressure is higher... combustion gasses find it harder to leave the combustion chamber due to higher TIP pressures and it leads to some reversion.

I was talking to JDogg last night about how differences in turbo manifolds and different sized turbines makes a HUGE difference on your fuel maps. You can "just turn up the boost" with the smaller turbine as stated, but after a certain point it will cause problems. Like anything else under your hood - keep your eye on it and try to understand what is going on and you can make "unideal" setups run well and run for a long time, or at least until you get the money in hand to buy what you want/need.