hell ya i wanna see a pic, and i do believe thats the could be a gnx or a gsx

 

What year is it? Is this a 4.3 liter 262 cid V6 or V8??? Please give all of the detail you can. How many miles are on the car/engine if you can post pics of the engine etc. What type of fuel injection?

I would like to know alot more because with the limited info it is hard to give any good advise.

PS In the 80's the Buick Grand National/Regal had a body almost the same as the Monte. I know the Grand National and I think possibly the Regal had the turboed 3800 in it. Either way I want a Grand National. And if I could ever swing it...I would take the last year they was made.

 

Alright, ive been looking for him to open up his garage and pull it out. It doesnt happen much but I am for sure gonna be on the look out. You gotta see this, its all black, black rims with chrome trim, 5% tint, yeah, Ill get a good pic of it.

 

It's been 11 years; has anyone come up with a turbo or turbo kit for the 4.3 Fuel injected?

I've been searching all day and can't find anything.

 

I don't know anything about pre-5th gen montes, but that's a very specific & old application. I think you'd have a hard time finding a bolt on kit still offered today.

If you end up not being able to find anything, I'd try to find one for any G body and just buy / modify that to work (the closer to your application the better). Itll likely be for a v8 application, so you'd certainly have to do modifications at the engine side connections, but at least the rest of the kit will be in the right spots for the body (saving time from building a kit completely from scratch).

The one thing to watch out for is what turbo size(s) they offer as you're going to have a harder time spooling it with that much less displacement. So you'll just need to do a bit of research on their available options first (or see if they'll sell without a turbo so you can spec your own with the same flange).

Edit - Another potential option, there is a generic hot side only 4.3 turbo kit on Amazon. No idea on quality of the turbo / fitment to a G body, but that might be another option if their manifolds put the turbo in a spot that'll work with your engine bay.

 

I just wanted to say thank you for the lengthy and helpful response.
What I've figured out is I absolutely can get headers that will fit, and a turbo and whatnot that will work. About $1,000 total.

The problem actually has come down to the ecu tuning. No one covers ecu tuning a 4.3 V6 turbo anywhere I can find on YouTube. And we both know with this turbo I'd be throwing bigger injectors on (it's TBI).

I thought I had it all figured out and planned out and I've hit a wall at ECU tuning. Apparently you can't add a turbo without tuning the ecu? And no shop around here will touch this because it's custom and old (not a Honda Civic).

 

Yikes, I could see that being problematic. I know even less about tuning those old systems - isn't that back when 'tuning' had to be done via a chip swap?

Not knowing anything about it - I've got a couple thoughts that might work if you can't find tuning for your specific pcm:

-You could adapt a blow through carb. Certainly a step backwards in tech and has its own issues / limitations, but it is a proven method to address fueling.
-You could swap to a standalone controller. Certainly going to a big name company probably isn't worth it as the it'll probably triple or quadruple the project cost - but what about something cheaper and more DIY friendly like MegaSquirt? I know they've been used on TBI applications before, just not sure how well it would interface with your existing setup.

 

Okay, I have an update after talking to two friends who do this sort of stuff and have regularly.

They are claiming on this old Monte, with just a turbo and some larger injectors, the oxygen sensor that goes into the intake will handle the tuning. They are saying the old fuel injection TBI has a throttle position sensor that just sprays more fuel through the Fuel injectors, and I don't need to mess with the ecu with the smaller turbo (GT45) I'm going with. Basically the sensors on there will adjust appropriately for me.

it sounds good but I don't know if that's true. Any thoughts?

 

Not any useful ones. I'm just not familiar enough with the system to be honest.

A few things to consider:
-How does your system measure air coming in to fuel against? Id imagine its got either a MAP or MAF sensor that determines this. If MAP, stock sensors are generally only 1 bar (ie cant read boost at all - they only go from full vac to 0, they can't read anything positive / boost)
-How do you handle fuel pressure? The system is calibrated to injector flow rates with injectors spraying into a vacuum. With boost, you've got more resistance pushing back against the fuel, effectively lowering the flow rate and injector. Newer stuff either needs to be tuned around that or run a boost referenced regulator that increases fuel pressure with boost to compensate.
-How does your system make adjustments to the program? Newer stuff has fuel trims based off of O2 sensor readings. Because every car / environment is different, the O2 sensor figures out how much fuel needs to be added or subtracted and makes those changes either via short or long term trims (within limits). The bad thing is that the stock O2 sensor is a narrow band and can only read around 14.7:1, it just locks in existing part throttle trims when you hit PE / wide open. Problem with that approach on an untuned turbo is the turbo will be ramping up boost at that time while the pcm is locked on a fixed fuel adder.
-How does it handle power enrichment / PE? Generally boosted setups have a lower target AFR under heavy load than NA. It wouldn't be enough to hurt anything if not fixed, but its just not ideal.
-How does it handle timing? A lot of engines need some timing pulled if boost is added to keep it from knocking.


Take it with a grain of salt, thats totally based off of 96+ obd stuff. Just throwing some things out there to think about.

 

You're totally right. I googled every line you have, and read about how things work.

Basically the only way I could get away with it is by putting a turbo on there that forced a very small amount of air in.
I'm essentially better off saving the money and getting an eBay cold air intake.

So i'm going to invest in a tune and a cold air intake. Any other $400 or less add-ons that pop into your head? Obviously I can just google a list or watch some YouTube videos.

Well, I tried! And I learned a TON talking to you and researching all this. I truly appreciate the dialogue.