Three pondering questions on 4.6 DOHC and IRS swaps

[a_penquin]

Originally Posted by Xemeth No, heads and intake have to match. The B heads need a b head intake, the C heads need a C head intake. The 99/01 Cobra and 03/04 Mach 1 have the same basic intake. So 99-04 heads use one intake, 93-98 heads use another. That guide I posted lists all possible intakes you can use for each head. Alright, thanks.

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[POISND U]

Originally Posted by Jazzer The Cat

I will address the IRS question

What are your goals and why this swap? If your goals are nicer ride for a DD, than you are good. If you are looking to run some high HP numbers for good launches on the 1/4 OR improvement on the twisties, you will be better off keeping your current SRA. Of course, you will need to invest $$$ into the SRA to out perform the IRS on the twisties, you will need to beef up the IRS to handle the 1/4. Even with IRS upgrades, you will never be rid of its wheel hop.

I say, keep the SRA and go CO's/PHB or WL and beat the IRS silly on the track AND the corners.

Jazzer

The only part that is untrue....

99% of IRS cars with the known remedies (bushings, decent tires, a good shock/spring setup, FLSFCs) have eliminated wheel hop. The other 1% are freaks of nature. There's more than a few Cobras running 10s with nothing more than the mods I've listed. Then they just start snapping axles....

OP, consider that you although you will be adding 85 lbs to ass of the car, weight distribution will improve.

As far as ease of swap, it could go either way....my swap took 12 hours because EVERYTHING went wrong. Subframe wouldn't line up on the donor car, shredded wheel studs, exhaust fitment, brake issues....I have SEEN it done in 3 hours before, though.

If you plan on power levels above 450 I strongly recommend keeping the SRA......Level 5 axles are STUPID expensive and the stockers WILL eventually snap.

[Jazzer The Cat]

^ thanks, Poisn

I have heard from many sources that there is always some, but good to hear that it can be overcome with the correct mods.

Jazzer

[97gold]

will the 4v swap be worth it what kind hp would u gain

[a_penquin]

I might just go with control arms and rebuild the SRA in the end now. Im looking for more that 450hp out the back and I dont feel like dropping a ton in beefed up IRS axles or having stockers snap and take out the hole side suspension.

[97gold]

And whats a irs and sra

[a_penquin]

Originally Posted by 97gold

will the 4v swap be worth it what kind hp would u gain

My buddies 03 cobra convertible just dyno'd in at 450hp (I think he said) with only a mild tune and cat back. Mine right now is probably around 300hp (wild guess, no dyno or track runs yet) on the SOHC.

Also IRS= independent rear suspension SRA= straight axle

[97gold]

what do u have done

[a_penquin]

Originally Posted by 97gold

what do u have done

in my sig

[97gold]

not to burst ur bubble but with non pi engine coil packs headers and x pipes u maybe be hitting 200 or 210hp