open wastegate ??

[turbors3]

how much power can you pick up by running an open wastegate ??

[Krdshrk]

... You don't understand how turbos work do you? Open wastegate won't make power. It'll vent the wastegate gases quicker and will free up power as opposed to a wastegate that will dump into the exhaust since there's less restriction. The amount of power freed will depend on your turbo setup... You can't give it a set number.

Also, if you run open dump, you're going to have an extremely dirty engine bay.. unburned fuel, oil, and hot gasses will be shooting out of it.

[trrbo_tc]

yeah i dont think it's worth running an open dump

[THansenite]

yeah i dont think it's worth running an open dump

I run open dump and love it. It doesn't add horsepower as much as it prevents boost surge. It allows excess exhaust gas to be vented quicker which prevents your turbo from overboosting for the short time it takes to vent the gasses.

As far as the dirtier engine bay part of it, mine has stayed relitively clean though I haven't had my turbo on long. I am going to be getting a dump tube fabbed up soon that will vent the exhaust below my car instead of in the engine bay.

But to the original poster, horsepower gains are negligible when comparing open dump to recirculated.

[Krdshrk]

Yeah that's why I spike 9PSI sometimes.

[turbors3]

ive heard a bunch of different things about wastegates. and yes i do know how turbos work. but i figured i would ask thats the only way you figure stuff out. my friend runs an open wastegate on his boosted k20 and it brought on boost about 800rpms sooner. and any time you would like feel free to bring the automatic tc to tennessee : )

[2dot4]

there's no advantage one way or the other, and since your wastegate doesn't open until you hit your pre-set boost limit, I don't believe for a second that an atmospheric dumb would increase boost response. That doesn't make sense.

The only thing that would make sense is that you would eliminate resistance on the exhaust when the wG opens....maybe freeing up 1 or 2hp, but like nick said, at the cost of oil and grime all over the engine. Given the small opening for all the exhaust to flow through, less backpressure through the wG would be nice, but not worth the side-effects.

it can also help extend the life of your turbo, but if you're looking for power, look elsewhere.

[turbors3]

well thanks for the feedback. guess ill just turn up the boost : ) does any know if they make a reinforced crank for our car because they just came out with turbo cams for our car i was just curious.

[JoshCrane1]

well thanks for the feedback. guess ill just turn up the boost : ) does any know if they make a reinforced crank for our car because they just came out with turbo cams for our car i was just curious.
my mech. at toyo just told me they do now, cuz im gettin one with my rebuild. i dont know where to find it though.

[turbors3]

sweet now all we have to do is find one lol

[Krdshrk]

Don't know why you're looking for one.... that's not the weak point in our engines..

[THansenite]

my friend runs an open wastegate on his boosted k20 and it brought on boost about 800rpms sooner. and any time you would like feel free to bring the automatic tc to tennessee : )

That isn't how the wastegate works. The WG has nothing to do with when you hit boost, that is all turbo. The only time the WG does anything is when you are at peak boost. Running a different WG setup won't do anything for how quickly the turbo spools.

[JoshCrane1]

Don't know why you're looking for one.... that's not the weak point in our engines..
yeah, i agree.. unless your planning on boosting 20+ psi.

my toyo mech. was telling me about it when we were discussing boring my spare motor to 2.7L and adding sleeves. i cant wait. hopefully they will be selling that new intake manifold by then.

[THansenite]

To my knowledge, the 700+ horsepower Nitto tC still uses the stock crank with no problems.

[Krdshrk]

Yeah... The weak points are the Piston rings (first thing to go usually), then the rods & pistons. Should sleeve the motor too.

[JoshCrane1]

im not doubting that the stock crank can handle some serious power, but the new crank would be stronger and fully balanced, which would help when putting down big hp. im surprised the 700+ hp tc hasnt changed out that crank yet, motor would run a lot smoother. but i dont have $ to throw around like they do so....

[JoshCrane1]

and the new crank does require a little bit of block shaving to make it fit. so dont forget your mach 3 turbo.

[THansenite]

I have neard of no problems with the 2AZ-FE crank. I would imagine they did a pretty good job of balancing it at the factory, otherwise, they would have engines blowing left and right. The tC's stock crank is fine, its the rods that are the weak point of our engine. Are you getting a custom crank? I thought the only aftermarket crank that was out is for the supercharger. And I don't think it is any stronger, just different lobes for the valves to get better efficiency out of the supercharger.

[JoshCrane1]

its and aftermarket crank, and idk the specifics, cuz i cant afford it and it seems overkill, but i believe it is designed for turbo app. when boring and sleeving.

[THansenite]

What company is making it?

[JoshCrane1]

What company is making it?
i wish i knew, ill ask my buddy that told me about it, we didnt go into that depth.

[turbors3]

well i plan on putting in pistons and rods and a 272/272 profile cam. i figured while i was in there i would replace the crank but if not needed then i wont. thanks. what about carillo h-beam rods any body running them..