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Turbo Conversion questions

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Greymare:
Hello all! I am thinking about doing a home built turbo setup with a blow through carb setup. I have seen the ebay turbo kits for as little as $500. I have the skills to make the rest of it work. I read up on converting the stock carb to a blow through and it seems pretty easy. I have a 2.3 auto right now and want to install a turbo and a T5. This car will be my DD so its not about having extra power for hot rodding it although I am sure the extra power will  be nice. I want it more for fuel mileage which means I will be going low boost.

Here are some of my questions for you folks.
1) What kind of Mileage are you getting from you 2.3 turbo setup? (Also what kind of setup are you running? Boost level, Turbo size, trans, gears, fuel source, ect.....)
2) What kind of Boost will the stock engine handle?
3) Anyone here ever done a home built turbo setup with or without blow through carb?

I am sure there will be more questions later but this will be a good start to see if this is really the directions I want to go.

Thanks in advance for any and all help!

Wittsend:
I recommend EFI and a donor turbo car. "65 Shebly Clone" is doing one at the moment. From my experience he is doing it the right way.  Follow his build and below are links to my post "So you want to build a Turbo Pinto? Parts 1 & 2."  One thing that always rings true for me is when I say, "On a scale of 1-10 it looks like a 2 on paper, but in reality it is a hard 7."


http://www.fordpinto.com/general-pinto-talk/so-you-want-to-build-a-turbo-pinto-part-1/msg76893/#msg76893

http://www.fordpinto.com/general-pinto-talk/so-you-want-to-build-a-turbo-pinto-part-2/msg76894/#msg76894

65ShelbyClone:

--- Quote from: Greymare on October 16, 2014, 02:56:04 PM ---
1) What kind of Mileage are you getting from you 2.3 turbo setup? (Also what kind of setup are you running? Boost level, Turbo size, trans, gears, fuel source, ect.....)
2) What kind of Boost will the stock engine handle?
3) Anyone here ever done a home built turbo setup with or without blow through carb?

--- End quote ---

1.) I can't answer that from experience just yet, but I will say that an EFI 2.3t/T5 is fully capable of over 30mpg in a slippery, but very heavy Thunderbird. That's with 1982-era electronics. I've heard reports of the same driveline doing around 30 in a Pinto. A carburetor won't do as well, but I would hope for 26+ with careful tuning and driving. If you do any kind of mixed driving, then the carburetor is a 5-10% economy loss off the bat simply because it can't shut off the fuel during deceleration like EFI can (called "overrun fuel cut").

2.) 8-10psi without any pinging. A factory 2.3T with forged pistons and 8.0:1 compression will handle as much as it takes to fold the stock rods, which is around 350-400rwhp/rwtq and typically 20-30psi depending on build.

3.) No, but you might find something on theturboforums .com. You'll need a fuel pump that can supply 5-7psi above your peak boost pressure and a vacuum-referenced 1:1 pressure regulator with an EFI-style return line.

I would strongly suggest getting a wideband O2 sensor for tuning the AFR.

amc49:
If you do not understand what EVERY SINGLE SMALL HOLE in a carb does and how to change that you are not ready for blowthru, rather drawthru is much easier. The negative to positive pressure issues with the carb will blow your mind.

 A carb cannot touch electronic injection as well and where the mileage increase truly comes from.

Homebuilt will not touch a fully engineered pre-setup like a factory turbo car, a million bucks worth of value there. Homebuilts often blow the first 2-3 engines until one gets a handle on how they work. Slightly lean just to make a NA car run off a bit often melts the engine with homebuilt turbos. You don't get nearly the chances to get it right. Why these guys are saying what they are. I myself have watched several insist they were going turbo until they gave up amid many broken parts. Being sharp is not enough, you gotta be REALLY sharp.

65ShelbyClone:

--- Quote from: amc49 on October 17, 2014, 03:18:21 PM ---Homebuilts often blow the first 2-3 engines until one gets a handle on how they work.

--- End quote ---

That is especially true with 2.3s. They are a tough engine, but have special considerations, particularly octane sensitivity. The fact that they have a 1950s chamber design coupled with all-iron construction, a low rev ceiling, and lots of torque (= cylinder pressure) makes them less forgiving on the tune. Fortunately they tend to blow head gaskets before things start to melt.

Ford employed a knock sensor on the 2.3T and an ECU strategy that aggressively pulls timing when knock is detected. They could be run on regular fuel, but at a 30%+ reduction in power.

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