Napster134

This is the 2nd time I post this but just wanted to get an opinion before I let the offer go. I posted in the wrong section before so I thought I would create this post where it should be. (Posted in TBI section)

A buddy of mines got a brand new supercharger for his S-10 that he is willing to sell to me for 350$ The charger was made for the 4.3 v6 engine.

I was wondering how things would go if I decided to attempt to custom fit this charger on my 355 5.8 w/ a 454 TBI / .477 Cam and 1.6 lifters/ edelbrock intake / aluminum headed/piston engine?

The following links is the supercharger in question.

http://www.performancetrucks.net/for...-$1200-469411/

http://www.superchargersonline.com/i...h/4GD218im.pdf

http://www.vortechsuperchargers.com/product.php?p=109



Thanks all!

Sorry for the repost.

Ronny

iTrader: (1)

What ECU would you use?

Napster134

EBL flash. That is what is currently on my car as I make adjustments to the current tune.

Napster134

I'm thinking I may have to end up installing a 2-bar map sensor?

My main concern is whether the 4.3 supercharger would actually be enough benifit to me to bother to make the custom install (if it even looks possible when I test fit it)

Napster134

Anyone?

40ozthreat

I did a blow through TBI with an a trim and the boost was only 2-3 lbs above ambient. I have a mild can with vortec heads so na it was about 350 HP. If you are all stock I think you would get a little more boost. Regardless with little boost forced induction still changes everything.

Napster134

Well like I said I dont know much about superchargers and im wondering, was it worth it for you? I'm not sure what 2-3 lbs of boost translates to.

But the engine is not stock. Its a 355 with a 454 TBI and fuel pressure at 18 psi along with aluminum heads, a compcam with .477 lift and my compression should be 9.8. I have 1.6 roller rockers and a RPM edelbrock intake. Exhaust consists of edelbrock 1/5" headers and 3" pipes. Tuning with an EBL flash and TT1 WB O2.

What do ya think?

Napster134

Btw whats a blow through TBI with an A trim?

My main concern about installing this supercharger is because its made for a 4.3 engine? Does that matter at all? I know small turbos drag ya down in the long run and bigger turbos drag you down on the low end due to the lag yet get you going in the long run so not sure how this goes along with a suprcharger made for a small engine on a much larger one. From 4.3l to 5.8l

40ozthreat

If it is a vortech v1 it will be the same for a 4.3 or a 5.7. It all depends on what trim it is. I used the a- trim which is low boost. I ended up upgrading to mpfi with the ebl because sealing the tbi throttle shafts was a problem and I kept saturating the tps causing it to fail. Take a look at the vortech installation manual on the vortech site for how they have you seal the shafts, additionally I would have the throttle shafts sealed in addition to equalizing the pressure.
I am very happy with the mpfi. The mpfi was a significant upgrade and I would definately perform that upgrade prior to boosting.

40ozthreat

I just looked through the thread again. What type of supercharger are we talking centrifugal or roots?

40ozthreat

Okay I looked into it. That is the v2 sq trim. That will provide you with some good boost. 309 is a deal and I would buy it. However, I would still recommend upgrading to mpfi. You can try supplimentary fuel injection and sealing and equalizing the tbi pressure, which would be the cheap way out. Get your hands o a 2 or 3 bar map and ebl will work great. I am selling my supplimentary set-up for 125. Pm if interested.

Ronny

iTrader: (1)

AMEN to that!

Napster134

Ok, I was a lil confused at first but I read about multi port fuel injection and seems like a more modern type fuel system with 8 injectors, one per cylinder. I seen some concerns about MPFI not being the best bang for the buck as far as power/money is concerned although correct me if I am wrong yet at the moment I am looking to make right around 400-450hp/tq once the supercharge is installed and feel that the supercharger would probably be the best way to go at least for my goals unless I can be convinced on why I should look more into MPFI?

I was thinking for $350 plus maybe about another $500 for the parts that it will take to install it would be a quick and pretty easy hp increase for the money as long as it clears the stock bulge hood which is now my main concern.

As far as the supplimentary fuel injection and sealing and equalizing the tbi pressure goes, what exactly is all of that?

My best guesses is that the supplementary fuel setup is that plate that has two fuel injectors? I thought I would be able to get away with simply increasing my fuel pressure on the TBI or hooking up the vacuum reference on my aeromotive fuel pressure regulator on my return line? and then just making adjustments to the tune with the 2 bar MAP ?

I have the 80lb injectors so I can boost those up to 22-24 PSI if needed.

I think I can take care of the sealing but what does it mean to equalize the TBI pressure?

Napster134

This article seems to have alot of info:

http://home.windstream.net/mcfly/tuning_fuel.htm

Heres a pic of the supercharger sitting in the bay, just test fitting... thinking I may have to move the alternator to the left of the engine and get rid of the AC somehow...

40ozthreat

That was the link I was going to try to find for you. I believe it is going to be diffict to get 350 HP blown with the tbi fueling only. Not saying that it can't be done or shouldn't be tried. Mpfi made a world of difference for me on throttle response and economy. The best part in my mind is that I have a super smooth idle and have enough fuel to support 500+ HP, without the use of a vafpr. Currently I am only putting down about 350 ish HP but I can crank the boost without even having to adjust fuel pressure.
I would try equalizing pressure as mentioned on the website you found and additionally have seals installed on the throttle shafts. This is very difficult on the larger tbis but can be done. Go easy on timing and stop immediately if you are lean. Trial and error will be needed with your fuel system, but remember not being careful may result in an error that results with internal parts becoming external.

40ozthreat

Also remember if you are boosting 5 lbs to subtract 5 lbs off of your fuel pressure as the outside of the injector is now at greater pressure than that of the atmosphere. So 23 lbs fuel pressure at 5 lbs of boost is now almost equivalent to 18 lbs fuel pressure.

Napster134

So here is another link in regards to sealing the TBI... what they did is pretty impressive and seems like a long shot from when I realized the author actually did to get the boost to escape from the throttle shaft and cycle back to the boost source... its clever and sort of funny too!

http://home.windstream.net/mcfly/sealingTBI.htm

I have an adaptor plate but its only about 1/2 inch so not sure if I would be able to be that precise...

But as long as I hook up a 2 bar, tune with my WBO2, and setup a vacuum line to reference my FP and then figure out some method of letting the boost escape to not flood my TPS with fuel... I think I should be ok... sounds like a lot lol...

Right now I am estimating my car to have about 330-360 hp/tq going off estimating power of newer cars I have raced in which I know how much power they make... So I think I should be able to make it close to my goal..

But I have another question... I keep hearing everyone talk about boosting to specific amounts and uping up the boost like if they can control the amount of boost that is being given... how does that work? I thought it was just a matter of installing the supercharger and then the amount of boost is what you get by how much the supercharger can produce?

Thanks for all of the help btw!

40ozthreat

The amount of boost depends on the supercharger and how efficient the motor is. You can also check compressor maps for the superchargers to see if you are running in the most efficient areas for the charger. Boost amounts can change based on impeller design and the belt ratio. Changing out crank and sc pulleys will change the amount of boost and thus where you are in the compressor map. I forget the page but try searching for vortech compressor maps, there are a few pages that will explain the maps.