TT and speed density - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 11 Old 01-15-2003, 09:01 AM Thread Starter
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TT and speed density

My dad has a 1988 LX with speed density. I'm looking to put a TT system on sometime this spring/summer. What kind of fuel management system should I look into?


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post #2 of 11 Old 01-15-2003, 09:04 AM
 
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Can you give us an idea of what type of power that you are looking to produce?

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post #3 of 11 Old 01-15-2003, 10:15 AM Thread Starter
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Well it's got a stock 302 with 110,000 miles. I just figured I would put a decent setup on there until it let go and then build a mild stroker. I guess I'd be aiming for the 450-500 range with the stock block.

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post #4 of 11 Old 01-15-2003, 10:22 AM
 
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There are many combinations that you could do, some of the common ones are:

DFI

Switch to mass air and get a calibrated blow through meter with 42lb injectors

You could set it up with an FMU with larger injectors

There are quite a few options you could in fact do.

Carson also suggested that maybe you could switch to a blow through calibrated mass air, and upgrade to larger injectors (42s possibly).

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post #5 of 11 Old 01-15-2003, 10:34 AM Thread Starter
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I'm guessing that when I upgrade the motor it would be better to go with DFI or FMU. At that point I'd like to be in the 650-700rwhp range. Right now I dont see an advantage to switching to mass air.

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post #6 of 11 Old 01-15-2003, 10:52 AM
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Look around on www.nloc.net Some guys get 400rwhp with a SAFE a:f ratio and 19lb injectors. All you would have to do is run an FMU, afpr, a high pressure pump, and a bleed off valve on the MAP, so it doesn't see boost. Granted it's not the RIGHT way to do it, and the fuel pressure would be have to be ridiculously high under boost, but it would work.

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post #7 of 11 Old 01-15-2003, 11:09 AM
 
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If those are your goals for the future I would go for DFI. It may cost more for now but you would spend less in the end.
I can't tell you how many times I see things bought only to be replaced a few months later.

If you go with DFI there are some really good deals out there for 55lb injectors.

The Accel Gen VII we installed on a customers car with our Twin setup and 55lb injectors ran and idled great.

We are starting a project with Accel to have pre-programed cells to help with the tuning.

If the DFI falls out of your projects budget I would have to recomend the mass-air change over with a calibrated blowthru and 42lb injectors. You could also add one of several chips or tuners available for the Mass air computer.
Our customers with Twin Turbo have given this setup the best feedback.
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post #8 of 11 Old 01-15-2003, 11:44 AM Thread Starter
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How much will the DFI system run? Am I running the risk of ruining the turbos if a piston or valve goes on the old enigne?

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post #9 of 11 Old 01-15-2003, 12:08 PM
 
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Yes there is a risk but..
Things that will most like fail first should have an effect on the turbos.
Unless of course you blow a head gasket and then drive it for another few thousand miles.

If you keep the boost at a reasonable level the stock motor should be fine.

We have 1 customer who has over 110,000 miles on his motor and the valve covers have never even been off the car. He runs it at 9-10 psi all the time. When he dynoed it with a mild tune he hit 403WHP and around 450 lbft of torqueand has been driving it for almost 6mos.
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post #10 of 11 Old 02-08-2003, 11:34 PM
 
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be careful when considering the DFI. The system cannot function beyond a certain level of manifold pressure. Call DFI and ask them specifically what the limit is as far as how much boost their equipped sensors will take.
issuez
FAST doesn't have this drawback

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post #11 of 11 Old 02-09-2003, 09:57 AM
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Not true

If you are reffering to the Accel DFI, there is no limit to the boost level the 'sensors' will take as you say. There is one factor to consider when ordering the DFI, you must let them know what MAP sensor you want. There are three common ones available - 1 Bar (For Naturally aspirated applications) , 2 Bar for up to 15 psi of boost, and 3 Bar for up to 30 psi of boost. There are other MAP's avail, someone was making a 5 bar the last time I checked if you wanted 60 psi of boost.

The problem with using a MAP with a potential greater than you inted is that you lose clarity, because the increment in the sensors output will cover a more broad range.

Even if you were to run 20psi on a 2 Bar MAP, it will not be damaged. But at 20psi, it will output the same fuel as if you were running 15 psi, which may damage your motor unless the fuel map was setup for this.

I can only say get some sort of fuel management computer. It will save you alot of time and money in the long run.

MJB
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