Just the basics

[Alaric]

Can someone give me a few pointers? All this reading has created a question or two. I have read that Ford shipped some mustangs with the Performace Intake? I assume thats what you guys mean with the PI vs NPI. Is there a way to tell which you have? My other question is why don't there seem to be alot of people using turbos? It seems Superchargers are the way to go? My ricer friend keeps telling me a turbo is better than a Supercharger because it doesn't cost power to make power. I think its because those little 4 bangers dont have the power to spare in the first place. Maybe im way off. Anyway, thanks for the info!


Alaric

 

[mogs01gt]

you have PI heads, PI cams and PI intake.

Turbo's will always be better than a super charger because of less parasitic loss on the engine and they flow more air(cfm)

But they cost more money on a v8 engine to design a good turbo kit. That is why a lot of people slap on a super charger because they are easy to install and tune compared to turbos. Now inline engines like a 4 cylinder take boost better than a V style engine. Plus most Hondas have their exhaust manifold facing the front of the car so they have plenty of room for a turbo. Pretty much any turbo 4 cylinder is just an engine with a turbo slamming air into, not too much thinking involved.

 

['13_ImpactBlue_GT]

First thing Welcome to the Forums

PI stands for power improved
NPI stands for non-power improved

The xtra 35 hp was due to a higher-lift cam, coil on plug ignition, bigger valves and a revised intake manifold. As far as your friend saying a turbo is better than a supercharger is subjective, as far as I know there is only 1 turbo kit for the GT and its about $7000. There are centrifugal and roots superchargers, the centrifugal relies on high RPM's while the roots makes power down low and up to midrange (someone please correct me if my info. is wrong).

 

[Alaric]

Thanks for the fast and accurate responses!

 

[tjm73]

First thing Welcome to the Forums

PI stands for power improved
NPI stands for non-power improved

The xtra 35 hp was due to a higher-lift cam, coil on plug ignition, bigger valves and a revised intake manifold. As far as your friend saying a turbo is better than a supercharger is subjective, as far as I know there is only 1 turbo kit for the GT and its about $7000. There are centrifugal and roots superchargers, the centrifugal relies on high RPM's while the roots makes power down low and up to midrange (someone please correct me if my info. is wrong).

PI heads have better flow carrectoristics.

"roots" blowers...I wish that term would go away. "Roots" is an antiquated type of positive displacement supercharger. "Twin screw" is much more correct (be it a Whipple or a Kenne Bell or even an Eaton). Twin screw blowers can make top end too and do.

It's a huge argument waiting to happen. Try searching if you want more info on the different types of forced induction and the benefits/drawbacks of each.

 

['13_ImpactBlue_GT]

Thank you for the correction.

 

[jstreet0204]

"roots" blowers...I wish that term would go away. "Roots" is an antiquated type of positive displacement supercharger. "Twin screw" is much more correct (be it a Whipple or a Kenne Bell or even an Eaton). Twin screw blowers can make top end too and do.

eaton is still a roots blower, although much more advanced than they used to be with its newer twisted lobes, it still isn't a twin screw

 

[Torinalth]

Jstreet is correct on that aspect, as Eaton is still a roots, though whipple and KB both use either the twin screw design of the autorotor (and some lysom (sp)) designs.

the turbos are in essence more effective, there really is no disputing that, however they cost more, are harder to install, and are not as effective on a larger block. reason being is the larger blocks (mustang engine) needs more air to begin with vs the 4 banger... but dont let that fool you, the turbo can be adapted to make the difference in ratio almost non existant (but its still there however slight)

blowers are more common for the mustang as its just more common practice on american cars. almost all FI american cars came from the blower catagorie save the grand national, and a select few others. just think of it as habbit over one being better then the other.

also, dont forget about Comptech and Jackson racing. they are the supercharger guys for the 4 bangers just as greddy, cybernation, and HKS are for the turbos... so import or domestic there are options for both.

as far as pi vs NPI, the 96-98 4.6 had a rather restrictive intake system, the 99-04 have better cams, heads, and upper/lower intake. so dont worry about that for your car.

Torinalth

 

[03ghoststang]

First thing Welcome to the Forums

PI stands for power improved
NPI stands for non-power improved

There are centrifugal and roots superchargers, the centrifugal relies on high RPM's while the roots makes power down low and up to midrange (someone please correct me if my info. is wrong).

the roots or twin screw do make power on the top end but they just reach full boost fast and make great low end power to get out of a dig quick as for the centri they rely on RPM's to be at full boost they are similar to a turbo minus the exahust portion of it

 

[Alaric]

So after reading more on here and on the KB web site, it looks like 6psi intercooled setup would be pretty safe, and a decent mod for a stock setup. Thanks for the info on turbos vs SC, I had read alot more since the time the responses came, but still very intresting history. Thank you very much!


I have been looking at the KB setups, I don't want to go overboard with internals, just enough to be respectable at the track against my ricer friends. So far the mod list is looking like this in order ...

Exhaust system (havent nailed down brand yet)
3.73
18s with decent rubber
lowered suspension (including frame reinforcement)
finally the KB intercooled
and a Snow kit

Any suggestions? Or does this seem safe/decent without having to do much to the engine? Again, im not looking to go overboard, and still want this as my daily driver.

Thanks!

Alaric

 

[MT1083]

the 6# kit isn't intercooled. If you don't have the cash now and want the i/c later then you can buy the 6# kit and then buy the rest of the i/c stuff later for the price difference of the 9# to 6# kit. Your stock gears will be fine with a KB so they aren't necessary.

 

[twogts4us]

PI stands for power improved
NPI stands for non-power improved

(someone please correct me if my info. is wrong).

Well, I wasn't gonna say anything, and you answer is more or less accurate, but since you invited the correction, PI actually stands for Performance Improvement.

 

[sgarlic]

Just to clarify, someone stated above that they had only seen 1 turbo setup for our vehicles. There are about 15, actually. I was reading through a site the other day, turbomustangs.com or something close, which had a list of turbo manufacturers for us. There's a ton.

In any case, you don't even NEED a kit to make a turbo setup for any vehicle. You can do it yourself. Just get your hands on the actual turbo's, and make some piping, get an intercooler or aftercooler, buy the turbo exhaust manifolds, etc. You could probably piece together a kit for way less than $7k, if you had the time and some fabricating knowledge.

The reason as stated above that everyone flocks to superchargers is because they are simpler to install, and there is more support for them (especially on the internet.) The main ones you read about (mostly the KB,) are popular because of how streetable the vehicle remains after it's installed. A 9psi I/C KB runs about 6k, can be installed yourself in a day, will give you 400rwhp, and gives you full boost at any rpm. That's great for street racing (which isn't condoned blah blah blah.) A turbo running 15+psi is difficult to street with. Especially if you have a 5 speed. Getting traction in 1-2 once you're in full boost is almost impossible on the street, if not totally impossible. By the time you hit 3rd you're going far too fast to be on the street anyway. I personally would never run a twin-turbo setup because I enjoy being able to drive on the street but floor it whenever I feel like.

 

[Dan_Soprano]

"roots" blowers...I wish that term would go away. "Roots" is an antiquated type of positive displacement supercharger. "Twin screw" is much more correct (be it a Whipple or a Kenne Bell or even an Eaton).
.

The Eaton is NOT a screw style blower. It is a ROOTS style blower. The Eaton makes boost in a completely different fashion then the Screw style blower. The eaton creates boost my compressing the air below the blower in the lower manifold. The Screw style blower actually compresses the air in between the "screws".