tw heads on 95 cobra

Modular2v · Oct 4, 2007

I have set of tw heads and was wondering if the car would freak out and want a extensive tune if i put them on my 95 cobra?

BlownFiveLiter · Oct 4, 2007

From what I recall, the J4J1 (Cobra) tune is typically more forgiving of mods than the T4M0 (GT) tune. I'm running them on my GT now with very few drivability issues. It's more so the cam that freaks them out, but nothing that can't be tuned out. IIRC, anything below a 112° lobe separation angle on the cam is what starts the headaches.

WHITE94COBRA · Oct 4, 2007

Just changing the heads? leaving everything else stock it will run fine, but you are leaving a ton of power on the table that way.

final5-0 · Oct 5, 2007

StangGT1995 said:
From what I recall, the J4J1 (Cobra) tune is typically more forgiving of mods than the T4M0 (GT) tune. I'm running them on my GT now with very few drivability issues. It's more so the cam that freaks them out, but nothing that can't be tuned out. IIRC, anything below a 112° lobe separation angle on the cam is what starts the headaches.

I agree about the cam and lower lsa's causing issues

I can see how the additional air flow might cause an issue or two but as said here, I'd think they would be minor.

WHITE94COBRA said:
Just changing the heads? leaving everything else stock it will run fine, but you are leaving a ton of power on the table that way.

I agree ... you will not be getting all you could

You'd gain the most by not worrying about the cams lsa or pcm freakin out
but
You'd also gain the most drivability issues along with the power

Those drivability issues can be tuned away but with a cost

It seems there is A L W A Y S some kind of compromise ... don't it

Grady

Modular2v · Oct 5, 2007

im thinking i should just leave the car completely stock (like it is) and throw a turbo on it with a tune

Zero_chance · Oct 5, 2007

That would definitely wake her up.

Modular2v · Oct 5, 2007

what kind of rwhp #s could i expect out of just putting the tw heads on?

final5-0 · Oct 5, 2007

Modular2v said:
what kind of rwhp #s could i expect out of just putting the tw heads on?

We kinda need to know about how your 95 Cobra is now equipped

A sig would be nice

Grady

Modular2v · Oct 5, 2007

final5-0 said:
We kinda need to know about how your 95 Cobra is now equipped

A sig would be nice

Grady

its bone stock with flowmasters

im new to all this pushrod fuel injection stuff....i know how to build a carb setup though (see sig)

Dino Dino Bambino · Oct 5, 2007

Modular2v said:
what kind of rwhp #s could i expect out of just putting the tw heads on?

It depends on what other mods you've done. Usually most people bolt on heads after they've done other external bolt-on mods (CAI, MAF, TB, pulley(s), headers, mid-pipe, exhaust), so the gain with the TW's in such a case would be something like 65rwhp.

final5-0 · Oct 5, 2007

With only swapping those GT40's for TFS heads I'd guess somewhere
in the range of 20 to 25 more

Grady

tw heads on 95 cobra

Modular2v

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