5.4 swap need tune?

[JustSpencer]

I know I would benefit from a tune but is it necessary?


also its a 99GT and a 2001 5.4 2v

[slow232]

what computer? what injectors? what maf?

[JustSpencer]

stock 5 speed 99 GT computer 24lb injectors and 01 cobra maf, also stock p.i. intake with rr adapter plate.

I'm not looking for alot of performance right now but I threw a bearing in the 4.6 and just need to get rolling again and I got a opportunity to upgrade

[ka0tyk]

tq monster.

[BondoSHO]

With the cobra maf, I'm going to say yes.

[Blanco32v]

good luck on your swap

[JustSpencer]

its calibrated to the 24lb injectors, got the maf and injectors from my brothers car, but would there be another reason for it needing to be tuned?

[BondoSHO]

its calibrated to the 24lb injectors, got the maf and injectors from my brothers car, but would there be another reason for it needing to be tuned?

Different curve possibly. Might want to ask Greg.

[Greg@RET]

Every set up is different even with the exact same set up. Obviously I will tell you it needs a tune, but even if that wasnt my business I would tell you the same thing.

[Blind]

it needs a tune, I picked up about 40rwhp with the tune on my DOHC swapped `97gt, using the stock `97gt harness/computer, 24lb injectors and the stock gt MAF.

Been planning to get it re-tuned for awhile now, just been too busy, would like to throw on the 90mm lightning MAF I've got set aside for it.


my car was running quite rich before it was tuned, ran/drove fine though, I drove it around for about 3 weeks to make sure it was running right before I hit the dyno.

[JustSpencer]

Every set up is different even with the exact same set up. Obviously I will tell you it needs a tune, but even if that wasnt my business I would tell you the same thing.

say I'm swapping the whole motor with all the bells and whistles, and the car I am swapping from had a custom tune, could I use his custom tune/chip?

[BondoSHO]

say I'm swapping the whole motor with all the bells and whistles, and the car I am swapping from had a custom tune, could I use his custom tune/chip?

If he used the Cobra MAF, I don't see why not.

[RedRyder]

Abaco MAF > lightning MAF

[Greg@RET]

say I'm swapping the whole motor with all the bells and whistles, and the car I am swapping from had a custom tune, could I use his custom tune/chip?


No. Not to sound harsh but a tune from me is $400, how much is your new combo?

[Blind]

say I'm swapping the whole motor with all the bells and whistles, and the car I am swapping from had a custom tune, could I use his custom tune/chip?

every computer code is different, even if the combo is identical the tune wouldn't work and there would still be variables to be accounted for.

[Greg@RET]

I figured the eec codes were the same lol. If they are different it wont work for sure...

[BondoSHO]

I figured the eec codes were the same lol. If they are different it wont work for sure...

When he said bells and whistles, I assumed he'd use the same computer. If not, yeah, tune needed.

[Blind]

When he said bells and whistles, I assumed he'd use the same computer. If not, yeah, tune needed.
you can't just move the computer on a 99 mustang, the PATS wouldn't even let the engine start unless it was completely reprogrammed by a dealer, which would probably kill the custom tune in the ECU anyways.

[06silverbullet]

i assume you're using a dump truck motor out of an f150? 5.4 2v ftl 5.4 dohc ftw..go find some cobra heads

[JustSpencer]

a friend of mine has a 99 GT with a 5-speed, so Im assuming the same computer, and he swapped in the 5.4 got it tuned and it was running fine but then wrecked it, I'm getting everything I will need to swap his setup into my car for $1000, but I wont have extra for a tune and I just need it driveable until I can get it re-tuned.

[06silverbullet]

use his comp

[JustSpencer]

cant if the pats wont work, I guess I'll just throw it in and see how it runs

[Blind]

use his comp
Won't work.

http://www.sievekingprodco.com/helpspg1504.jpg

http://allfordmustangs.com/forums/2005-2009-mustang-gt-tech/186850-pats-system-help-needed.html

[06silverbullet]

why wouldn't it work if he's switching over the wire harness and complete engine?

[96GTS]

What chip/tuner is it? You can simply have any tuner disable the PATS on the chip. Use your friends ECU w/ his chip/tune and, if it ran fine before, it will run the same for you.....

[Blind]

my friend did a `96 v6 swap with everything from a `99 cobra, so unlike my swap he used the harness and computer from a `99.

he ended up having to tow it to a dealer and have them re-do the PATS system, cost him ~$800

his car is tuned with an sct, tuner tried to disable everything PATS related but it still wouldn't start and spat out PATS error codes.

---------- Post added 12-02-2009 at 12:09 AM ----------

why wouldn't it work if he's switching over the wire harness and complete engine?
do you have no idea how it works? Because the key wouldn't match the computer, therefore it won't allow fuel, spark, or crank. The only way to do it AFAIK is to take the instrument cluster, the steering column, the key, and the computer.

[Mizry]

put it all together and see how it runs.. that maf and injectors will work together, but I think it has to be an 80mm lightning maf to work with the 24's.. you will know after it all up and running weather or not it needs a tune.. Sure a custom tune will extract the most power but that can be said about any combo stock or modified...

[BISKIT]

my friend did a `96 v6 swap with everything from a `99 cobra, so unlike my swap he used the harness and computer from a `99.

he ended up having to tow it to a dealer and have them re-do the PATS system, cost him ~$800
his car is tuned with an sct, tuner tried to disable everything PATS related but it still wouldn't start and spat out PATS error codes.

---------- Post added 12-02-2009 at 12:09 AM ----------


do you have no idea how it works? Because the key wouldn't match the computer, therefore it won't allow fuel, spark, or crank. The only way to do it AFAIK is to take the instrument cluster, the steering column, the key, and the computer.

If he has matching computer, cluster and key he shouldn't be having PAT's issues.
On our 97 Those 3 parts were transferred from the 99 (along with engine, trans, etc) and car fired right up on the first try.

[Blind]

If he has matching computer, cluster and key he shouldn't be having PAT's issues.
On our 97 Those 3 parts were transferred from the 99 (along with engine, trans, etc) and car fired right up on the first try.

my friend couldn't get the steering column/key or cluster from the donor unfortunately, he kind of pieced the wiring together with ebay purchases of different harnesses and the ECU.

[Killer281Saleen]

Dude, stop being a cheap ass and tune it with Greg. I'm going to leghf at your ass when you blow it up...

[BISKIT]

my friend couldn't get the steering column/key or cluster from the donor unfortunately, he kind of pieced the wiring together with ebay purchases of different harnesses and the ECU.

Ah, that explains it.