f250 5.4 turbo help

[tdmconstruction]

hi i have put a turbo on my f250 it looks great but it dose not go great we got it dynoed and pulled 244 bhp rear wheels and then the gearbox went in to safty mode would not stay in one gear and jumped all over the place so i thourt i had stufed the gearbox so i put a brand new one in and it still did the same thing the maf senser is not working propely i think and the computer might be demaged. should the maf senser be on the psi side or the other side no one over here can help me i was tring to get a after market cpu and run a m.a.p senser insted but can not find one i am stuck i dont know what to do next is it the gearbox or the maf or the computer or somthing alse

[FTE Ken]

I think you're going to have a hard time getting any answers. I can't understand 50% of what you're trying to say. Please give details about the build, and use periods between sentences. I normally never say a thing about grammar, but I want to help and feel like I'm reading Chinese!

[tdmconstruction]

i bought a sts turbo kit for a f150 and modified it to go in a f250 this was the easy part.then i put bigger injectors in which came with the kit. then we tried to flash the cpu with a tune from diablosport .the tune was all wrong but we got it running .
found a guy that said he could tune it on the dyno and we started tuning ,the first reading was 103 bhp at the wheels he keep- ed changing stuff on his laptop on the 80th run we had pulled 244bhp this is great but than the next run it was going good and then the gearbox started to flare (free rev). we stopped at this point changed some stuff back but keep doing it .
we took it for a drive it would go in to 1st and in to 2nd no problem but when you put in drive it would surge between 2nd and 3rd gear .
so at this stage we thought it must have busted the gearbox so i got a new one completely done all the tuff stuff in it new converter .
put it back in and it is still doing the same thing.

i am having trouble with the maf sensor getting dirty can the fam do weird stuff like what i am talking about ,or is it more the cpu has died
and is their a aftermarket cpu that would run this motor and gearbox with a map sensor instead of a maf sensor.

[FTE Ken]

Sounds like your tuner isn't worth a damn. This isn't a CPU dying. If it died the truck wouldn't start at all. You need to find a tuner with real experience tuning turbos, and properly adjusting the transmission for them. Go find someone else, this guy sounds incompetent!

[Lead Head]

What kind of air filter are you using? An oiled type air filter can cause the MAF to get dirty. Switching to a MAP system will be a lot more trouble then it is worth, as you will have to build a complete fuel table from scratch - very time consuming. You need to completely scrap the tune you are working with, and get something like a custom SCT tune.

[tdmconstruction]

the oil filter is not a oil based one.
i have ordered a new maf and tps and i will put that in and see how that goes.
i will keep you guys posted
thanks for all your help.

[tdmconstruction]

why cant a standed computer run a turbo to start with.

[Lead Head]

The stock MAF system with upgraded fuel injectors would be able to detect the extra air flowing in, and give you a moderate increase in power. The garbage tune that you loaded onto the computer screwed everything up. If the tune was all wrong from the start, there is no point in even trying to use it. Just reset to factory stock, and get something like an SCT instead

I'd put the MAF about 4-8" away from the turbo on the intake side to prevent interference from the turbo impeller effecting the MAF reading. Also make sure your intake air temperature probe is in the boost side of the intake system.

[tdmconstruction]

sorry , but what is a sct we are very limited over here in Australia for gear for the f trucks.
thanks for your time
went to the local dealer here for a price on a new maf sensor $2,500 just for the sensor.
got one in your great country for $70.00 delivered.
got to love that ebay

[Lead Head]

SCT is a flash tuning device that can have completely custom tunes loaded on to it. What you need to do is find a competent ford tuning company. The F-series uses the same 5.4L V8 in some Australian models.

[Blurry94]

I agree with what's mentioned above; there shouldn't be any reason why a turbo application can't be tuned with toadays software that is available for these newer vehicles.

I wouldn't bother with another stock MAF though, you will need one that is calibrated for a boosted application; SCT and PMAS are two that I would recommend. It wouldn't hurt to have a fuel pressure gauge on it as well to see what the fuel system doing under boost; a drop in pressure is as bad as pegging the MAF and the engine will go lean a hurry.