What gives more HP?

[MDTcTuner]

All these dynos were taken from another scion forum. I will gladly supply the link that has all this information at the bottom of this post.

Stock wHP is 136.84 as per this dyno.

wHP with a Greddy Evo2 axleback is 142.16 according to this dyno.

5.32 wHP gain.

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this dyno was done with the Greddy Evo2 axleback, but the gain is still the same.
wHP with stock headers is 141.17 and with Alphawerks header is 150.25 according to this dyno.

gain of 9.08 wHP

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The intake dyno was done with Alphawerks headers on but like I mentioned above, the gain is the same.
wHP with stock air intake is 149.41 according to this dyno
wHP with the Injen CAI was 157.50 according to this dyno.

gain of 8.09 wHP
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From the tests used, there is a total of 22.49 wHP gained.

It may not be 35-45, but its still not that bad. Now if you add in some NST pulleys, and a Fidanza flywheel, you can probably pull close to another 10-20 HP out of your car. It's amazing what weight removal can do.


Also, as mentioned, the page I took this information from can be found here. I had nothing to do with these tests, I was just using this to help me plan out some work for my car the other day and thought I'd help others out.

Here's the thing I don't like so much about the Scion tC. The injectors (although slightly bigger than that on its sister "the Celica") are a bit small for what the Scion tC is capable of. Get rid of those bitsy 220cc injectors, upgrade to 390cc??? injectors and you'll get 10hp/tq right off the bat. Add headers, and you'll get around 5 more HP. Add TRD exhaust and you'll get about 8-10 more hp out of it. Add a SRI and you'll get 5-10 more HP out of it (Depending on how hot the air around the SRI is). Add a CAI and you'll get about 3 more potential HP from the NA setup, but this too is effected by temperature around the Intake.

You'll get 35-40HP/TQ gain overall in a perfect environment, but because you've boosted up the Injector sizes, it would be best to get a FMU or EMS for the car so that the fuel doesn't go to waste at higher RPMs. With all the components listed above, and assuming that you're looking for budget Brand parts, you'll spend about $1,300-$2,300 on your NA car. So expensive only because the computer and design departments for this stuff is still in its R&D phase. It'll work, they just don't know exactly for how long.

You CAN do it, but no matter what you do to your car "performance wise," you'll have to spend a bit of that piggy bank money that you have saved up. Otherwise, you're a Honda with a fartpipe.

[tC-sCharged]

everyone get a intake supercharger will add 30-45 horsepower for less then 400 bucks!

[kevsays]

Keep in mind you cannot just add hp numbers together. The air intake will create hp at different points in RPM then the exhaust and headers.

[tC-sCharged]

get a performance chip! PROMAX PERFORMANCE, there is one for sale if you're think about adding 25 to 38 hp.

[onefiend]

instead of getting a TRD S/C, you can do a cheap swap with a H22, they are easy to come by and have gotten cheaper, with the cost of the engine and the labor to install, it would be a bargain compared to a TRD S/C.

H22 is rated at 200hp with 156 ft-lbs. tq. and a very nice redline of 7,500.

[Alex8181]

Correct me if I'm wrong, but are you telling him to swap a Honda engine into his Scion?

[onefiend]

Correct me if I'm wrong, but are you telling him to swap a Honda engine into his Scion?

yes. lol... it's doable, yeah he has a Toyota with a Honda engine, it makes him fast & unique and Honda engines get alot of aftermarket support.
I don't think he will do it anyways, I think TC owners would rather spend their money on a TRD S/C or a Turbo and there is nothing wrong with that.

[hotrice]

we are very disappointed in you suggesting a honda engine shame on you for that.
p.s your mothers pancakes suck!!!

[ac3 b00gi3]

get sum weapon R headers .. NST pulley .. ur guaranteed more HP & TRQ

[monkeyzz510]

Whoa we can't get on honda like that...
we are not suppose to hate them, we are suppose to get along with all cars
its jus that TC's kick ass more
anyways, i got a intake and exhaust and im not gettin headers due to california smog issues but anything else that gives off HP?
Crank pulleys? Slip differencials?

[navylife59]

Lightweight crank/WP/Alt pulleys are a good start. They recover wasted HP, not produce more. Next should be a new S-pipe. It will change emissions one bit. You can take off the OEM heatshield on the s-pipe and put it on the new one for a stealth install. I don't think even a "trained" Scion tech could figure it out.
Limited slips don't make power. Again, they recover wasted energy by allowing both tires to grab traction from a dig (drag launch). In a corner, it will transfer power to the wheel with the most traction while still allowing the other tire to have some power.

Synthetic oil in your crankcase and transmission. Good for the motor/tranny and recovers a small bit of wasted energy. Redline Water Wetter will keep things a little more cool in the radiator.

Speaking of cool, do you live in the hot part of Cali? You could run a fuel chiller system to make the fuel denser. There are various types put there on the market from CO2 to Dry Ice systems. You could wait for me to produce my proto-type fuel rail that will have a built in chiller.

NOS. 25HP shot is your best bet there, but no more than a 50HP shot. That is all I am going to say. You can google the rest on that for pros and cons.

Upgrade your engine block/head/chasis/battery grounds. You can pay over a $100 for a kit or DIY for $30 with car audio 4GA power wire and lugs.

Get the TRD S/C. Full CARB legal and comes with factory warranty if Dealer installed. They will, however, replace your aftermarket intake.

Run a good 89 Octane gas when you go out on the prowl during hot weather. Nothing more and no octane boost is needed on N/A motor or the ECM might think your running rich and dial out some fuel.

[monkeyzz510]

Oh i live in the cool part of California
in the Bay Area...
cant have anything nice here, or people will try n boost your car
which is lame
yeah i S/C sounds good and it doesnt really kill the lifespan of ur engine, does it?

[navylife59]

No, it actually does not change the life of your engine in the stock TRD form, even at 9.5PSI.

[monkeyzz510]

oh cool, i might consider gettin one than,
when i have the money....

[crawler4christ]

Why are we making fun of Honda's? Last I checked (2 nights ago) My best friend's new SI dominates the tC- my car their 200 hp and 139lb aren't great off the line but then it hits about 5k and there he goes. We probably shouldn't talk crap about a guy with .4 liters less than with a better breathing engine makine 40 more horses. (The lack of torque is almost unnoticeable once first gear gets to 5k. Every shift puts it right back in the high hp range). Believe me I race him all the time hoping for different results
Also, If I add I/H/E will that void warranty? I'm a total noob to new cars and warranties. Thanks!

[navylife59]

No, it will not unless it is the direct cause of damage. The warranty cannot be voided, just not honored when it comes to the issue at hand.

BTW... Let me race your friend's Si. He can run me all day long in 5th gear. HE ain't going to catch up.

[monkeyzz510]

LOL... If you do race make a video
that sumthing i really want to see

[crawler4christ]

Keep in mind he's N/A and only spent 18k on his Honda =) That's what most of you guys pay for our tCs. That's the beauty of non-fixed pricing But hey I'm a Scion guy too. I just want to beat him without emptying my wallet. But if you look at the figures, the Si's are built pretty well. They've got CAI and great exhaust from the factory. They've got a 2.0 I think that makes 197 hp.

I think I'm going to Injen CAI and some sort of exhaust and headers. I know you do your research navy, so what's your recommendation? Or any recommendation for other upgrades?

[navylife59]

A true 4-2-1 header would be preferable over a 4-1 like the DC Sports. Replace the s-pipe. You can run a good axle-back, everyone has their choices on this one. LW crank, h20, and alt pullies from NST. Run synthetic oil in crankcase and tranny. Leave the stock ignition alone. upgrade the grounds between the Batt, chasis, engine block , head to 8-4GA amp wiring. Lighten your car with CF hood, fenders, and hatch. Run highend 89 octane and reset your ECM. You could experiment with a hotter plug by a factor of one to see if you can squeek a lil more. CAI is a must. This is about all that you can do for now. Later you can run a fuel chiller system, or NOS, of h20/meth spray. The later might benefit from simple e-manage to advance the timing. For the serious minded N/A, you have to think higher compression, ported/polished head with oversized valves, upgraded camshafts, and even stroker kit.

[monkeyzz510]

Ingen CAI is always the way to go
I have one and i love it!