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Difference between Flex fuel and normal
03-05-2016, 12:40 AM
Post: #1
Difference between Flex fuel and normal
Okay guys so I have been looking around and found out that the 4th gen mercury sable has a flex fuel version but I found out that the Flex Fuel model and the OHV model use the same engine. Which is the 12-valve Vulcan engine. So my question is, what is the difference between the two engines? Like what would I need to steal off of a Flex Fuel model to make my non Flex fuel model into a Flex fuel model?
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03-05-2016, 10:57 AM
Post: #2
RE: Difference between Flex fuel and normal
Well for openers you'd need everything that either touches fuel or controls fuel so likely we're starting with the fuel tank and it's related hoses, fuel pump, lines, injectors, and probably wiring harness, which would have the different connections for the various sensors needed to detect the changing fuel. Don't forget the ECM. The next question is about it being legal where you live because you are making changes within emissions retated items. One more thing... since the alternative fuel will likely deliver lower MPG, why would you want to change things?
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03-08-2016, 04:31 AM
Post: #3
RE: Difference between Flex fuel and normal
Well Rupe I have been currious about this just because of the fact that E-85 can be better at giving you performance on the track and such and I am also asking cause I have been personally asked this by one of my friends who has a tarurs. I know that there are other ways besides factory but a Halatech system is way out of my budget and my friends budget I am just wanting you to explain on here what would need to be done so that other people would know what to do and how to do it. Basically I want this thread to really inform for future people who are wondering what to do.
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03-08-2016, 12:07 PM
Post: #4
RE: Difference between Flex fuel and normal
As with any modifications one must understand why a change works to be able to figure out what combination of parts will perform best. You can do all sorts of stuff "on the cheap" if you don't care how long it will last. OTOH, that's part of why certain aftermarket kits cost more than others. They have done the legwork to save you time and effort, which generally equals more $$ for their parts. Hey, even good instructions are worth their weight in gold!

Short story time:

Years ago I had a guy wanting to put a Corvette 350 LT-1 MPI into his Suburban so he found one locally with a harness and ECM. He thought it would be a bolt-in and could drive it in a week or two. After much deliberation I told him the front trim on that engine (alt, ps, ac, etc) would not fit due to the steering box location and we needed to change those parts for Camaro trim where most mount on the other side. That was an expensive and time consuming redesign. Nothing on the engine harness reached either so off to buy a new one. Fast forward to driving it with the OEM transmission. He wanted something with more beef so ordered a race prepped 4 speed automatic, which I suggested should have certain shift points. Boy was he happy! (and broke) Still not fast enough? Lets change to 4.11 gears (front and rear) for better punch at a traffic light. Soon afterward he wanted a belt driven blower and asked if he should get the kit with 7 psi or 20 psi boost. I asked if he wanted to tear the engine down because 20 psi would be blowing head gaskets. He settled on the 7 psi boost deal. Boy, this thing has some serious snot for a 5,000 pound vehicle! But now we have a new problem.... the special order trany has the wrong shift points for the power curve and the new diff gears. The thing just accelerates too fast and over revs at the 1-2 shift. (like 6500 rpm instead of 5000) Oh well, more expense and time!

Bottom line is each modification causes a series of changes elsewhere so you need to understand the big picture or be willing to make more changes along the way.

Oh, forgot to mention he bought that blower on eBay and after 3 evenings of fooling with belt / pulley combinations (that didn't fit) I called the mfgr with my dilemma. 5 minutes later they had the right combination on the way. I figured afterward that he would have been $200 ahead in labor if he bought the correct "full kit" in the first place instead of trying to do it the cheap way.
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