Does anyone make a supercharger for a 92 RS TBI? I know they have em for the TPI but i dont think ive ever seen one on a tbi...let me know...thanks

 

DO A SEARCH!!!!
Supposedly superchargers don't go well with TBI because they are a wet flow system. There are superchargers for TBI, mainly truck applications though, such as the Whipple supercharger. Way too expensive though. Anyways, their are so many other mods you can do to your engine/car for the same price and get it running faster than what a supercharger will do to a stock engine.
I honestly think that a supercharger would work w/ TBI, but only after you have an engine that's prepped for it. There are others with much more knowledge and input on the subject, and it has been covered many times.

 

I dont know about the wet flow comment. Hot Rod did the vortech carb blower and they got 220 more hp out of a 440 HP engine from the get-go. That's pretty unreal. They have a close up of the box enclosure and it looks like it wouldnt be too hard to adapt to TBI, but the fuel lines and throttle linkage would be trickey.

There's a guy on here now with a procharger. Id love to see a picture of his setup.

It would seem to me that the problem would be getting fuel into the engine.

 

I heard that supercharging is a waste on TBI because of air restriction. Trying to force more air down those little holes doesnt help much. Most say nitrous is much better on a TBI car vs. supercharging. Much cheaper to.

 

ok thanks guys...ive been trying to decide if i want to put a 350 TPI motor in my rs but i was told that ya have to get a new computer and rewire everything...sounds like alot of work and i was told that the computers wasent cheep. About the supercharger idea...it just kinda poped in my head and thought that might be cool but for 2000-3000 bucks im sure i could do lots of other things.

 

Yes, you can have a LOT of stuff for $2000 as Im finding out now

 

There's a member named OneBinky.......This is from a past thread...i hope he doesn't mind.....

But anyway here ya go

 

I would honestly only do a blower on a TBI car after you install a better cam/heads/intake, because they are so restrictive as it is, you wouldn't be getting nearly the benefit out of the blower that you could be getting.

 

my opinion is....NAAAWWWWSS Only reason i say this is because its A. much cheaper B. easier to install C. better bang for you buck on a TBI car. If i had a TPI 305 or 350 id defiently save money and put a blower on it.

 

If there is so much restriction through the TBI, why don't you boar it out? I know you can boar it out to 48mm and use the TPI throttle blades in the TBI.
There has been a few posts about it.
I am thinking about doing it if I ever mod my engine. (fingers crossed) Hopefully soon.

 

Supercharging works as well on a TBI induction as it does on any other intake platform (at least at streatable boost levels). I was told that with anything over about 14#'s of boost you would start to have fuel spray problems, but at my current 6 #'s, I have no such problems.

As it has been stated many times, the TBI really isn't the bottleneck in these cars. It is the heads mostly, followed up by the intake and cam once you get it breathing better. On a naturally aspirated motor, the TBI only mildly ported will support up to about 400 HP. I don't know what it would be when boosted, but I'd imaginge it to be more than 400 HP.

So, I guess as it was stated earlier, just make sure you take care of the shortfalls of the motor before you get into any kind of power adder

Matt

 

You know, a lot of people never get that through their heads. They think the TBI motor is the same as the TPI motor, it just has a different EFI on top. But they aren't the same, and TBI is not as limited of a system as everyone seems to think (other than us guys who frequent the TBI board of course) they just put it on top of an intentionally low output motor because its cheap/simple.


BTW - 2 things. 1. Are those Lund Eclipse hood scoops? Do you have any more pictures of them? Was thinking of doing it a long time ago when they first came out. 2. Where in IL are you from? I don't recognize the name of the town.

 

HrdRockA4305: That is exactly true! It really starts to get to me sometimes when people say stuff like "Man, that's only a TBI??? That must be a dog! Why not swap it for a ____" Just fill in the blank with just about any induction system that they think they know.

Anyway, yeah. Those are the smaller lund scoops. My dad put them on the car when he still owned it. They look even better in person then they do on the car.

Also, I don't know if you are fimiliar with the area at all, but we are 5 minutes south of Joliet. I think its about an hour to hour and a half from peoria.

 

some things that need to be cleared up to understand supercharging.
1. wet flow or dry flow, boost will make more power
2. boost overcomes basic air flow restrictions by forcing air past them, thus moving teh limits up noticably.
3. teh reason fuel gets screwed up at higher boost is because it must over come the pressure surrounding the injector befor eit can even get teh fuel out, the is why a lot of super/turbo guys run FMU's or boost variable fpr's of soem sort. it balances teh pressure of the fuel in scale with teh boost adn avoids teh problem of too much or too little fp under one circumstance or another.
4. the biggest problem with the cone of the fuel coming out of the injector is that most blower set up force air in sideways across teh inujector path. the turbulance from this is what actually cause s the disruption, not the pressure itself. this can be overcome be making an over the top type of a hood that points teh air flow down teh throttle body neck, the proble is that such a system would stick way up and create hood clearance problems.

the biggest restriction in a stock LO3 or LO5 is the cam. it si a joke. the heads and tb are capable of out flowing the cam by an incredible amount. restriction #2 woudl be a toss up between teh heads and a the intake, the heads are not great, but tehy can out flow the intake by a lot. the tb itself is not much of a problem stock since it can easily handle more than the stock intake/heads/and cam could ever ask for.

boost works, plain and simple.

later
tim

 

Another thing to consider is the 170hp 305 TBI boosted to 6psi is only going to add 50% more hp or around 250hp total. That isn't much for the $3000+ investment in the supercharger. My experience with superchargers is they are not real reliable mileage wise. Don't expect it to last 100k miles. They have fixed some of the reliability issues since I ran one but I have been burned and won't go that route anymore.

Moral of the story. Invest in either a new more powerful motor or at least new heads, cam, intake and exhaust for your 305 and you can easily yield more than 250hp for less than $3000.

 

Before the charger I was pushing about 250 HP. With my mods I'm pushing closer to the 300-350 HP range, but you are right. 6 PSI isn't going to make a huge difference for $3000 dollars. That 6 PSI is only temporary until I get my 350 together, then I will be shooting for closer to 10 PSI. I just don't think my 166,540 mile bottom end could handle all that boost. Personally, I think I took the wise path

 

Also, ATI is one of the most reliable brands out there. And my understanding is that all the manufacturers except paxton use a newer and much more reliable bearing design.