So, mcgeorge has the TRD supercharger listed on his site as pushing 5psi. Now, I've just been looking at turbos, and I understand that the more boost (psi) you put, the more power you'll put out. 6psi, 8psi, 12psi, whatever. What I want to know is if a supercharger is the same way? Can you adjust the psi on a supercharger to make it crank out more power?

 

Yes, but on a supercharger you need to decrease the size of the pulley on it to make more power. However, the tC's motor is a high-compression motor so you'll want to be careful when boosting more. Otherwise all that will be blown is your rings or head gasket

 

people just always want more power hehe

 

The reason I'm asking is cause I think the scionspeed turbo is pushing 15psi now! I think 8psi or 10psi without major engine mods. So I wanted to know how it would be with the TRD SC. I dont' know much about SC.

 

yup they sell boost pullys for that

 

But if I'm not mistaken, witha turbo, you can get a boost controller to make boost adjustments simple. For example, running 6psi daily, then turn it up to 12psi for track days? Is anything like this possible with a SC?

 

Not anything where you can just turn a dial. All that you can do with a supercharger is press on a quick swap pulley hub. That way all you need to do is remove the belt then remove a few allen bolts and swap the pulley (otherwise you'll need a pulley removal tool to swap them).

 

I wouldn’t say 9.6:1 is a high compression. In some respects, yes, but even when it comes to forced induction there are far worse, or higher, compression ratios to deal with. Such as the K20A3's 11:1 ratio, which, by the way, there are pre-fabricated, bolt on, superchargers available for that put out some very nice numbers that don’t require any internal modifications to lower the compression ratio, nor racing fuel. I know what your saying though, I'm sure 8.6:1 would be more optimal for boost, but 9.6:1 is a whole lot better to work with then 11:1. :D

 

McGeorge does not list the PSI for the TRD tC supercharger. Where did you locate that info?

 

no the TC motor is not high compression. hish compression is more like 10:1 or 11:1. the TC is more like 9:1. The reason why the compression is low on this motor is, of course the option to add on the TRD supercharger. now if it came from the factory with a high compression motor, and we install the SC. then after a long period of time the motor will blow. . there you go just to clear up some confusion.

 

Sorry. I read it from this February acticle from Road & Track http://www.roadandtrack.com/article....rticle_id=1823

 

As a general guidline every 1 psi of boost equates to aproximately 10 hp gain. So if the supercharger is running 5 psi that is a 50 hp gain at the crank, making about 210hp overall.

 

Not quite. Not every motor isd the same. 5 psi in the tc with a compression ratio of 9.6:1 will make more power than say GM's 3800 Supercharged Series II which has an 8.2:1 compression ratio. When I had my Buick (with the aforementioned motor) I was running about 14psi... and I know I wan;t making an extra 140 HP from it.

 

I wouldn't run over 6psi on stock internal. You may get lucky and not blown your engine but your internals will get damaged.

 

I'm pertty sure the tC can handle in everyday basis 6-8 psi easily, consider the TRD supercharger kit will come with ECU upgrade and (4) fuel injectors upgrade. A 9.6:1 compression, along with the known Toyota reliabilty, is good for med-low high boost, i.e from 6-12 psi in either force induction: Turbo or superchager. If the F.I. setup includes an intercooler setup then the levels can be higher like 12-15 psi

 

ive seen other cars with aftermarket SC. since i dont know that much about Supercharging, can you add a intercooler with the kit? and will it affect the performance?

 

I just want to say this about boosting thier isn't that much diffrent in running
9.6-1 cr and boosting 5psi
then running
8.6-1 cr and boosting 10psi.
All I am saying higher compression = less boost and lower compression = higher boost. Unless your planing on boosting 14 or more psi the factory cr is fine.

think about it all you are doing is decreasing the cr to boost more just to get the same if you keep the cr and boost less. I hope every sees what I am saying.

 

No kidding.... I said as a general guidline not as in its a fact.... I realize its not the same for every motor...

 

I was quoted 6 PSI from Scion sources. That is a safe number, which is why it is still waranteed. If you go much above 8 on the tC, then I would start thinking about other mods as well.

 

So let me see if I get this right. If the TRD supercharger comes at 6psi, all I have to do it get a different size pully to up it to 8psi and get more power?