What gives more HP?

[Leon]

Okay, I did quite a little bit of research and the TRD supercharger cost in the neighborhood of about $3500/installed and it adds 40 more horsepower to your stock hp which will make it 200hp.


What other parts would add that much without spending thousands?

Anyone knows how much HP for the basic 3 bolt-on performance parts like I/H/E? (Intake, Headers, Exhaust).

Furthermore, what about Pulleys and Cams?

[SupachargedSupawhite]

The supercharger gives more than 40hp. It has dynod on numerous occasions between 190-200whp. The equals about 220-230hp. TRD underrated the supercharger. 225hp from 160hp is a pretty substantial gain IMO. Thats a 40% increase as opposed to their claimed 25% increase

[Leon]

If I'm not mistaken... I/H/E might add a total of about 35-45 HP? And it cost in the neighborhood of about $600 installed. That's pretty darn close to the S/C at a fraction of the price.

[Alex8181]

From my previous experiences, even 35hp on I/H/E is not really attainable. You should expect more along the lines of 10-20hp.

It all depends on what your overall goal is. The highest horsepower for the buck will still be some kind of forced induction (actually it's NOS, but i don't want to go there). If you decide to go all out NA and want to get the same amount of horsepower, eventually you'll spend the same amount or even more than what forced induction would cost you in the first place.

[Leon]

what about pulleys and cams?

I'm trying to avoid force induction if I could so I don't have to mess with the ECU

[SupachargedSupawhite]

Originally Posted by Leon

If I'm not mistaken... I/H/E might add a total of about 35-45 HP? And it cost in the neighborhood of about $600 installed. That's pretty darn close to the S/C at a fraction of the price.

Um no I/H/E for the tC will ever make 35-45hp.

Intake will cost you about $250 new
Header will cost you about $300 new
S-pipe will cost you about $150 new
Cat-back stainless steel exhaust will cost you about $600 new

That equates to about $1300 new WITHOUT installation. From all of these mods, you will get maybe 20whp. = $65 per 1whp

The TRD supercharger gives the tC about 55whp for $3000 shipped WITHOUT installation. = $55 per 1whp

[Alex8181]

Originally Posted by Leon

what about pulleys and cams?

I'm trying to avoid force induction if I could so I don't have to mess with the ECU

Even if you go NA, by the time you go beyond I/H/E, you'll need the benefits of some type of engine management to fully tune and get the most out of those mods.

I would consider what your goals are. If you're looking for ultimate horesepower, I would save your money and get forced induction. If you're looking for modest power and long-term reliability than do I/H/E.

[Leon]

Alex, I like modest power and not temper with the ECU. I have had bad experience with my previous vehicle about massive power. I replaced the engine three times

SuperWhite, perhaps the I/H/E would only add less than 30hp but the price for those that you listed is way too much?? Am I the only one that is paying less for my mods? I do have buddies here that owns and operate a "Pimp My Ride" kind of store. I can get those parts about $600 and I'll install them myself. The paint job that I have on my car would run about $5,000 to $7,000 but I merely paid 10% of it.

Supercharger sounds nice but the dealer here charges $4,000 for it. Although with the I/H/E it might not be half the horsepower you get with the supercharger but sure beats the price! The price I can get the I/H/E from my buddies is about 15% of the supercharge's cost.

What other mods do you guys know of to add hp without reprogramming the ECU?

[Alex8181]

In that case I would probably move onto tranny mods. You can get a lot of drivability from a short shifter, flywheel, or a clutch.

[SupachargedSupawhite]

Originally Posted by Leon

Alex, I like modest power and not temper with the ECU. I have had bad experience with my previous vehicle about massive power. I replaced the engine three times

SuperWhite, perhaps the I/H/E would only add less than 30hp but the price for those that you listed is way too much?? Am I the only one that is paying less for my mods? I do have buddies here that owns and operate a "Pimp My Ride" kind of store. I can get those parts about $600 and I'll install them myself. The paint job that I have on my car would run about $5,000 to $7,000 but I merely paid 10% of it.

Supercharger sounds nice but the dealer here charges $4,000 for it. Although with the I/H/E it might not be half the horsepower you get with the supercharger but sure beats the price! The price I can get the I/H/E from my buddies is about 15% of the supercharge's cost.

What other mods do you guys know of to add hp without reprogramming the ECU?

Unless you are getting a custom exhaust made by a muffler shop, thats the price those product cost. note: the prices I listed are for brand new parts. Of course you can get them used for much cheaper. I am just trying to compare apples to apples here.

[Leon]

HKS or Greddy exhaust runs around $200.
DC 4-2-1 headers runs about $250.
Injen intake S/R runs about $80. Injen CIA runs about $150.

Those are brand names mods, but if you don't care about the brand you can get those parts for half the price.

For intake, just get a pvc pipe and a 3" K&N filter cost you like $30??
Headers, CNC machine with stainless steel pipe and weilding cost you like $100?
Exhaust, like superwhite said.. a muffler shop for $20?

A total of $150 for I/H/E for generic parts that does the same as the name brands.

[SupachargedSupawhite]

Originally Posted by Leon

HKS or Greddy exhaust runs around $200.
DC 4-2-1 headers runs about $250.
Injen intake S/R runs about $80. Injen CIA runs about $150.

Those are brand names mods, but if you don't care about the brand you can get those parts for half the price.

For intake, just get a pvc pipe and a 3" K&N filter cost you like $30??
Headers, CNC machine with stainless steel pipe and weilding cost you like $100?
Exhaust, like superwhite said.. a muffler shop for $20?

A total of $150 for I/H/E for generic parts that does the same as the name brands.

I wouldn't go as far to say that the generic parts do the same as the name brands. The price I gave the exhaust was for a full cat back exhaust. The HKS and Greddy are axle-back I believe, which don't really do much in the performance area. More for looks and sound. And if I am correct the Injen SRI and CAI are the same thing. It can just be configured both ways. You still have to pay the CAI price.

[Tanubis]

if your going to go F/I I reccomend an aftermarket exhaust becuase if you use the factory one you might get alot of backfiring

[Leon]

What's F/I?

Fuel Injection????

Well, I'm trying to save money for the Greddy Turbo Kit and have to save more for installation and tuning.

[Tanubis]

lol F/I means forced induction.

[Leon]

cool thanks,

turbo kits are too expensive for me now.. gonna be at least a year at the

earliest.

[Xavier,bro..]

Like yourself, I wasn't looking to spend $3500 in a supercharge kit, but I wanted something that was affordable and that could make a lil' noise.. I say... you get yourself a nice Injen cold-air intake, and with some DC headers, and a decent exhaust (nothing loud and flashy please- this class is too classy for that sh*t), and that'll bring you up atleast 35hp more, and well under a $1,000'ish_ Just a thought

[INVINCIBLE]

Originally Posted by Xavier,bro..

Like yourself, I wasn't looking to spend $3500 in a supercharge kit, but I wanted something that was affordable and that could make a lil' noise.. I say... you get yourself a nice Injen cold-air intake, and with some DC headers, and a decent exhaust (nothing loud and flashy please- this class is too classy for that sh*t), and that'll bring you up atleast 35hp more, and well under a $1,000'ish_ Just a thought

Like they say no I/H/E will give you 35-45 whp...

[Madzozs]

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.