300hp mark?

[Doubleg]

Im a new member and im not very familiar with scions but if i wanted to hit the 300 mark with a s/c what supporting mods would i need.

[Vmix06]

well do you have any mods yet or are you building a list to hit that mark?

[Doubleg]

i would like to compile a list i dont have one yet

[Vmix06]

for the basics you can do i/h/e, pulley and you can use the TRD s/c if your still under warranty and if your not i think rotrex has a s/c for us but il have to check on that or navy can answer that lol

[navylife59]

As for the Rotrex kit, the last word that Kenny Tran heard at SEMA was that development had not started yet. I forget the players, but they are some well known industry players. I plan on doing my own Rotrex setup on my race motor.

As for 300HP from the TRD S/C, it can happen but not too easy. The trim of the Vortech S/C that this system is based on can obtain 20PSI on paper. There are two major problems to accomplishing this; internal bearings and the TRD pulley shaft system. The worst of these is the TRD drive system while the bearings can be replaced with higher load bearing ceramic ones.

The true Acheles' heel of the TRD is just that; TRD. 2005-2006 kits came with a dual idler pulley setup. This created not only an extra amount of friction on the serpentine belt (crank pulley losses), but the bearings in these pulleys often failed. 2007~up S/C kits come with a modified drive setup that utilizes a single idler pulley. Next up is the ill-gotten pulley drive system, aka the shaft. This shaft is actually 3 pieces welded together; 2 high-strength machined keyed pulley ends and a mild steel solid shaft. The overall assembly appears to be machined after welding, but my unit contain no tell-tale balancing marks. With its overall heavy weight, mild steel, and low RPM design does not lend itself well towards spinning the higher revs required to make more boost. Out-of-balance conditions rob horsepower and the shaft could fail.

Another issue with reaching for the is that achieve more boost, you have to run a smaller pulley. The current limit is 14.5PSI, any smaller and the pulley would be too small to machine safely. Also, the smaller the pulley, the less amount of surface area for the serpentine belt to grab hold of. This equates to belt slip which kills the high RPM HP. To overcome this the crank pulley would have to be larger, but the 2AZ-FE does not have the physical space. You could run an extended crank pulley direct-drive cog belt system, but the passenger side frame rail provides no clearance. You could servo drive the Vortech directly, but I have not designed that yet. : )

Last, but not least here is the ECM and the TRD maps loaded into it. We all know that the Scion's ECM does not take orders well from even the best piggy-back controller. The TRD maps are built for 7PSI and 440cc injectors. All of this sets the 10PSI limit and inability to increase the injector size w/o a piggyback and a dyno tune. To make 300WHP, larger injectors and more boost is the name of the game. You also have to install some sort of intercooling technique whether chemical or mechanical transfer.

A properly built SRI, a free-flow (cat delete) 2.5" ID exhaust, upgraded fuel pump, high-end BPV, upgraded clutch are also requirements. As you can see, planning and money is what your going to need to make 300WHP. If compared apples to apples against a Stage I turbo kit, cost should still be less if you can most of the work yourself.

[TcforLIFE]

will the transmission hold 300 Whp?
or will it shatter. cause i know ull need a new clutch, and a LSD to put it to the ground but im wondering if itll be able to bear that much power or not

[Redneck4csa]

The transmission is not what you have to worry about. The clutch is the main thing that you have to make sure will hold 300whp.

[TcforLIFE]

well i was gonna get a new clutch either way, and especially when i turbo it.
i just wanna know how much the transmission will take... buttom line

[turbo-tc]

well i was gonna get a new clutch either way, and especially when i turbo it.
i just wanna know how much the transmission will take... buttom line

go turbo like i did.
i have the stage one dezod kit
that i added a few minor things to..

im pushing 276whp/295wtq
on mustang dyno
on 10psi

if i ran on a dyno jet id clearly make the 300whp mark
Dezod Motorsports Inc-We ARE performance. Scion tC turbo pros!

[TcforLIFE]

no!....
i know what turbo im gonna get, i know what im gonna do to it

i just wanna know how much power the transmission can take before itll break....
or will the clutch just break and i would have to get a bigger one, and when i get a bigger one will the transmission go when it hits like.... 500 hp or what?

[turbo-tc]

no!....
i know what turbo im gonna get, i know what im gonna do to it

i just wanna know how much power the transmission can take before itll break....
or will the clutch just break and i would have to get a bigger one, and when i get a bigger one will the transmission go when it hits like.... 500 hp or what?

well if you know who chris rado is..
he has built a few tcs up and one i know for a fact
has like 550hp and im pretty certain its on a stock
tranny.
i know that one he raced with was well over 600hp.
but dont know. well if you are wanting to hit that gain
you must have a few bucks to throw around..
just test and see or just get one custom built to your liking.

[TcforLIFE]

yea, i just wanna know if like... 400 hp will be ok on my transmission,
cause i dont want to break it cause of the power, and be out of a car....

[turbo-tc]

i dont see a problem.
i myself is a noob with cars/...
but just make sure you got a good clutch

[turbo-tc]

fyi
with that much power with a FWD
youll just sit there and spin all day.
worry bout traction b4 power...

[cribbs-tC]

yea, i just wanna know if like... 400 hp will be ok on my transmission,
cause i dont want to break it cause of the power, and be out of a car....

Any time you pump that much extra power into a car, there will be a risk of breaking stock things.

[turbo-tc]

Any time you pump that much extra power into a car, there will be a risk of breaking stock things.

yep yep
x2

[TcforLIFE]

exactly!
so will the transmission hold that much power.... cause im not really getting a straight answer here,
cause i know with the new evo, if u put another 100 or so ponys in it, itll destroy the trany

[turbo-tc]

exactly!
so will the transmission hold that much power.... cause im not really getting a straight answer here,
cause i know with the new evo, if u put another 100 or so ponys in it, itll destroy the trany

thats evos.
not Tcs.

look if i ran a dyno jet id be alil over 300hp+
and i have no problem with the tranny yet.
ive went through shifts pretty hard sometimes.
just get a really good clutch.
the clutch is what you need to worry about.
not the tranny.
if you really worried call a scion tech at a dealer
or something.

[TcforLIFE]

haha, the guys at scion dont know anything, they never do...

but yea, ill just get the clutch and LSD, and i pray nothing will break lol

[navylife59]

Kenny Tran (you know who he is!) of Jotech/Scion Racing Fame built the most powerful street tC making 739WHP and 572ftlbs torque. It is running on a stock E350 and axles. The clutch was the only thing beefed up and there was no LSD. Of course, this is a dyno queen and will never see the track. I am fairly certain that Chris Rado's T/A car has upgraded axles, upgraded LSD, and maybe cryo'd gearset. After the clutch, you need to be more worried about the OEM wheel studs. They have been known to break on the road coarse track and knuckleheads with impacts.