07 tc

[somcoupe]

How strong are the bottom ends for boost? I goin to turbo mine and I hear they are pretty stout, I wanna run about 15-20 psi of boost do yall think it would be to much for the bottom end of the motor? I already have the turbo, it is built for a max of 28 psi, I was gona supercharge it but I think i can do more with the turbo setup.

[Imagin]

You can do much more with a turbo. Now as for wanting to run 15-20 PSI, you have a few things to worry bout when going that route.

1. Theres some turbo tC guys out here in hawaii that have a problem with cracked manifolds, dunno if this is just company specific or what

2. Lack of a LSD and the engine itself. the LSD should speak for itself, you turbo or super it should be NESECCITY. Now as for the engine, it might stand up to 15 psi for a while, but it WILL blow out, and rather quickly. You need to build the motor, possibly sleve the block, so you can reliably use over a pound of boost (14.7psi) The tC's motor is very "Middle Heavy" as ill call it. It comes into itself around 3000 or so RPM, right where the turbo comes on. So theres some work to be done engine wise, for the boost level you want to run.

3. I can allready tell a blown motor is in your future (sorry to be bleak), because your saying allready, the turbo is built for up to 28psi (a little over 2lbs of boost) instead of sizing the turbo to what exactly you want to do in the car.

4. You will need to keep an eye on your transmission.

Honestly if i was you, id worry more about just staying 6-8psi of boost. The itch will hit to turn the knob to see just what a lil more can do. Wait until you can make the car ready for the amount of boost you want to run, before you take the dive. Im not saying dont turbo, or to go supercharger, im saying just make sure your ducks are in a row before you cross the pond.

[navylife59]

Your piston ring lands will give up running 20PSI boost. Go the sensible route and keep it to 8PSI till you can build up your lower end.

[ThetC]

navy life and imagine is right 8 psi is perfect and 9 if your ballsy, build the motor then crank up the boost to 12 or 13 and you will be one happy camper, by the way, on stock internals, boosted at 7 pounds smokes 350z's sti's and evo's all day long

[navylife59]

burn baby burn!

[chicotunner07]

28psi is nuts, on a stock block that is, ull be pickin parts out of ur oil pan, stick with 8-9 psi of boost, or check out ZPI they have upgraded head packages, as for block reinforcement, find a reputable shop and do it, then think about 28psi of boost!

[somcoupe]

Yea I got to reading some of the weak points in these motors and I think I decided to stay in the lower boost range till I get the block built for it, I figured prolly run like 8.5 psi but when I build the block I want, it will be at 20 The turbo is a t3/4 .50 trim

What kinda 1/4 mile time yall seein out of your boosted tc's?

[Imagin]

This is just my guess based on how i feel the car reacts to boost. If im off, chastise me. (at a low bost level between 6-8psi)

The stock tC is about a 15.8-16.1 quarter mile car
Supercharged is around 15.0

Without LSD-high 14's

With a LSD-probibally low 14's

Sorry im sensable about a FWD with wheelspin like the tC will do turbocharged. (From what im told, it does it enough with the supercharger)

[navylife59]

The tC needs you to spin the tires off on launch to get decent times. With an open axle setup, especially this car, when the one tire breaks traction the other tries to grab traction. The prob is that on a hard launch both tires will loose traction. You will have to feather your clutch in and out a few times to maintain your grip but your torque curve is going to start dropp'n off. If your turbo then you aren't going to have the higher RPM's for your power curve. The best thing to do is to keep your RPM's up which means wheel spin. I tried it both ways and the wheel spin is the only thing that gets me up and going. An LSD and better tires would turn the equation around 180.

[peruano85]

what is an LSD by the way? not very savvy with engine stuff but learning as i go

[Imagin]

Limited Slip Differential. It basically equalizes the torque going to the driving wheels. Do a burnout or accelrate in a turn, youll notice the tC suffers from a bad "peg leg". Itll one wheel burnout like that. The basic way to think of it is, youre making both wheels turn with the same force, not one with alot and one with a little.

www.howstuffworks.com they can explain it better than i ever can

[chicotunner07]

Open differential(which is what tC's come with stock) basically directs power to the wheel with less resistance, AKA, the easy way out, So if u had one wheel in a puddle of oil, and the other on hot smooth pavement, the tire in the oil would receive all of the torque rather than the tire with all of the grip, a Limited Slip Differential works completely opposite, giving power and torque to the wheel that has the most resistance, For example, while making a right turn, the LSD would give more power to the left wheel therefore making a much more powerful and smooth turn, with 20psi of boost, LSD is a must, B the way, www.scionspeed.com has a 400+hp tC doin 12's, check it out

[peruano85]

oh ok my friend told me about this..he had it in his civic and did recommend i get one for my tC in the long run

[navylife59]

The stock tC can spin both tires. Rev to 4K and drop the clutch and you will get 2 nice black marks. That happens on an open diff when both tires loose traction.

[chicotunner07]

yeah, that too, but try burning out while turning the wheel and ull notice it!!

[somcoupe]

yea try this in a turn hit first gear hard then immeaditly slam 2nd and I cal lay down a SINGLE black mark for about 100 feet or more dur to the peg leg, lol.

What size intercooler can you fit in the front? I found one but it is 43.5 inches overall length I think that is way to big?

also anybody have pics of how they did there turbo setup i'd appreciate very much.

[chicotunner07]

normally to fit larger intercoolers you have to cut the stock crash beam

[navylife59]

I can slam 1st thru 2nd and into 3rd before it wants to stop spining the craptenzas. Also, alingment has alot to do with traction in this car. When I installed my Hotchkis Stage I TVS, lowering the car, I could not help but break the tires loose. If I did not granny the clutch out, there I go laying rubber. Once I had it aligned at the dealer, that problem resolved.

[chicotunner07]

Yeah, thats intresting, i need an alignment myself, it veers right, a tiny pinch, but its anoying at highspeeds you eventually start drifting to the right slowly, bout how much does an alignment come too at toyota dealership?

[SilverKnight]

Originally Posted by navylife59

I can slam 1st thru 2nd and into 3rd before it wants to stop spining the craptenzas. Also, alingment has alot to do with traction in this car. When I installed my Hotchkis Stage I TVS, lowering the car, I could not help but break the tires loose. If I did not granny the clutch out, there I go laying rubber. Once I had it aligned at the dealer, that problem resolved.

I have gotten mine to keep my Yoko's spinning halfway through 3rd... Very nice!