Do i need a tune?

[MaxxdSVT]

Hey, i'm sure this has been covered before, but i couldn't find anything thru search. Just purchased a bone stock 04 SY coupe. Want to do JLT cold air and bassani x-pipe w/ bassani cat-back. Do i need to tune the car right away if i do those mods? I have a SCT livewire tuner already from my previous car. If i do need to tune it, where can i get a basic flash tune for just those mods. Don't plan on doing any other bolt-ons until next year. Thanks

 

[03cobra#694]

Which JLT and does the mid-pipe have cats?

 

[351stang]

If you have the JLT that moves the MAF to the fender, then I'd recommend a tune or at least checking the A/F ratio.

 

[BlksvtCobra01]

If it doesn't move your MAF location and the mid pipe has cats I think you would be ok. I think these cars came rich from the factory. However it's always good to check the AF ratio.


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[03cobra#694]

If it doesn't move your MAF location and the mid pipe has cats I think you would be ok. I think these cars came rich from the factory. However it's always good to check the AF ratio.


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Fat as heck, hence my post Patrick.

 

[Shadow Grey 03]

I think my stock tune went to 10:1 up top. Just a little bit of excess fuel

 

[HPLouis]

Here is a close to stock A/F ratio. Car has a Magnaflow catted X-pipe and Borla Touring catback as it's only modifications. I was in the 10's for A/F from 4000rpms and up. You have a lot of room.

 

[HPLouis]

Now, all I did was add some timing, with my SCT Pro Racer Package and got this:

Almost 400rwhp and I didn't even touch the MAF transfer function (A/F ratio). I would have went over 400 if I leaned it out a little. There are a couple of things I turned off that fattens up the A/F ratio even more. They are temp controls for cats and exhaust (switch for cat temp control, EGO control and flange temp control) that richen the A/F ratio. Basically, once the cats and exhaust reach a certain temperature, the car will dump more fuel and fatten the A/F ratio (usually at WOT)

 

[MaxxdSVT]

Thanks for all the info! Gonna order the jlt cold air, bassani xpipe and cat back. Which spark plugs should I run? Gonna change them as routine maintenance.

 

[nxhappy]

OEM plugs will be fine since you are keeping the stock SC pulley

I suggest you get a SCT x4 and have it tuned. You will gain much more power this way with the intake/exhaust combo.

 

[MaxxdSVT]

I have the SCT Live wire TS

 

[nxhappy]

I have the SCT Live wire TS

ok, cool. That should be pre-loaded with a performance tune.

 

[BlksvtCobra01]

Don't use a canned tune on one of these cars.


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[HPLouis]

Since you have the LiveWire already, why not pick up a Pro Racer Package and a Zentronix wide and and tune the car yourself? Since you're staying stock, it won't be hard to tune it. The Pro Racer even comes with a base tune for 91 and 93 octane that you can start with.

 

[351stang]

Why not put a 2.8 pulley on it?