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Old 02-21-2011, 11:07 PM   #1
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v6 to v8 advice

So right now I have an all stock 94 v6. I found a nice 4.6sohc still bolted to the trans, drop in shape. What's everything I would have to change and a price for all that. Would it even be worth it or should I stick with just a rebuilt trans and 3.8 that came with the stang.
Note: this car has been in my family for years. My brother gave it to me with the intention of me fixing it up and not letting her fall into the wrong hands so selling her is NOT an option. Thanks.
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Old 02-22-2011, 07:09 AM   #2
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Take everything from the donor car. Everything.
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Old 02-22-2011, 07:10 AM   #3
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Take everything from the donor car. Everything.
Agreed. And then sell everything you dont use.
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Old 02-22-2011, 12:05 PM   #4
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Well technicly there is no donor car, a tree fell on It and totaled it but he salvaged the engine and tranny, so I'm more or less on my own. I just don't know if the cost of the needed parts are worth it. I already have a local mechanic who's been working with my family for a while so he's reliable and he would give me a good price. I want to do as much on my own if possible.
Does anyone know of like a list of things that I would need to switch out in the 94 to hold a v8 from a 99?
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Old 02-22-2011, 01:23 PM   #5
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Re: v6 to v8 advice

I would think long and hard about putting forth all the effort, money, time, and money (in their twice for good reason) just to end up with a SOHC 4.6L engine... its not going to be that great of a performer in any where near stock form so you might want to consider other options.
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Old 02-22-2011, 02:28 PM   #6
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Well the guy is selling the engine and trans together for $400, seems really low though so if I consider it I'm deffently looking at it. But other than that I'm most likely going to mod the h3ll out of it to make it a little better. But that's just beacuse I'll have the money left over.
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Old 02-22-2011, 05:11 PM   #7
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It's an npi motor. Which means it's not much better than a 6. You need 99 or newer.
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Old 02-22-2011, 06:43 PM   #8
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Well I was looking at the specs on American muscle and it's said that the HP was about 215 which is better then the 145 on the sixer, but what do you guys meen by it's not great performance? What was different about the v8s?
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Old 02-22-2011, 07:14 PM   #9
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Well I was looking at the specs on American muscle and it's said that the HP was about 215 which is better then the 145 on the sixer, but what do you guys meen by it's not great performance? What was different about the v8s?
Npi 215 pi 260.
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Old 02-22-2011, 07:45 PM   #10
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Re: v6 to v8 advice

You'll need the ECU and all necessary wiring along with the engine/transmission.

Keep in mind you'll want to add the quad shocks and the 8.8" rear, or beef up your stock 7.5" It might be worth it to ask him how much he wants for the 8.8" rear out of the wrecked car. I believe the 94-97 v6's came with a rear sway bar from the factory.

The 96-98 4.6L SOHC's weren't the best engines, but they are definitely better (and faster) than the same years v6. As with the 99+ 4.6L's, bolt ons aren't going to net too much in gains, but FI or built internals will get you some serious power. Just remember performance parts are generally more expensive for the v8's compared to the v6's, but the gains are usually better too (comparatively speaking).

If you do decide to do the engine swap, I'd highly recommend doing a PI head swap from a 99+ 4.6L. The swap will put you at 99+ hp ~ 260 at the crank.
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Old 02-23-2011, 08:30 AM   #11
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Re: v6 to v8 advice

for only 400 you get what you pay for more times than not, you dont want to end up with a 400 dollar paper weight~ so make sure its inspected fully.
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Old 02-24-2011, 07:13 PM   #12
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If I was you I would find me a 5.0 motor and put it in there . 4.6 cost so much to do upgrades on vs a 5.0 you can do alot with for cheaper. I have a 01 4.6 twin turbo and for what I payed and horsepower I am making I could have built a 5.0 motor with same stuff for a third of the cost .
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Old 02-24-2011, 07:32 PM   #13
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If I was you I would find me a 5.0 motor and put it in there . 4.6 cost so much to do upgrades on vs a 5.0 you can do alot with for cheaper. I have a 01 4.6 twin turbo and for what I payed and horsepower I am making I could have built a 5.0 motor with same stuff for a third of the cost .
Let's remember that a 5.0 has a totally different operating system. Your ecu would be pretty much useless and you would be starting from scratch. And it doesn't really bolt in. I suggest a 4.6. Much easier to transfer and they are very durable.
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Old 02-24-2011, 08:05 PM   #14
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This is going in 94 year model right ? They offered the v6 and the 5.0 that year if memory serves me well . Motor mounts and comp are the only difference . That car was not set up for the 4.6 that year so he would have to add all the stuff to do the 4.6 just as he would the 5.0 . Being that he had a 6 in there to start with. If he is just getting a heck of a deal for the 4.6 and trans then go with it. 5.0 is the way to go if he is wanting to make power naturally for much cheaper. The 4.6 motor likes boost to make it's power. You can spend an easy 7k on a blower, cam and heads for a 4.6 and get about 475 to the pavement. With the 5.0 I can spend about 3k on heads, cam,intake and a bottle of nos and waist a 4.6 all day. Heck I had to put 12k into my car on the head cams and twin turbo system to get 655 to the ground . My buddy's 93 lx mustang with a 5.0 has about 7 k in the motor and is almost has me beat . I'm just saying if you want to make the car fast cheaper go with the 5.0.
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Old 02-25-2011, 02:38 PM   #15
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Yes it would be going into a 94. But I'm trying to think what would be cheaper, the v8 with a few mods or my v6 with (on comming long list of mods )
Underdrive pulleys
CAI (my brother has one sitting in my basement for me to put in)
Throttle body
Shorttie headers
Dual exhuast conversion kit
4-bank chip (or If I can find a tuner)
water methanol injection (stg 1)
4.10 gears
Lim slip differental
Strut tower brace
Stock suspension and brakes (need to be replaced)
Thanks for the help everyone
~bongstang
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Old 02-25-2011, 02:43 PM   #16
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Quote:
Originally Posted by Bongstang1
Yes it would be going into a 94. But I'm trying to think what would be cheaper, the v8 with a few mods or my v6 with (on comming long list of mods )
Underdrive pulleys
CAI (my brother has one sitting in my basement for me to put in)
Throttle body
Shorttie headers
Dual exhuast conversion kit
4-bank chip (or If I can find a tuner)
water methanol injection (stg 1)
4.10 gears
Lim slip differental
Strut tower brace
Stock suspension and brakes (need to be replaced)
Thanks for the help everyone
~bongstang
Methanol injection is pretty much a waste without forced induction
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Old 02-25-2011, 03:21 PM   #17
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Re: v6 to v8 advice

the V6 with just those mods will not compete with a 99+ stock 4.6L in performance but the 96-98 4.6L's were VERY slow in anywhere near stock form.
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Old 02-25-2011, 05:11 PM   #18
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Methanol injection is pretty much a waste without forced induction
Well dosnt It basicly boost ur octaine? Which should help kind of, and I plan on getting a supercharger sometime down the road.
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Old 02-25-2011, 05:12 PM   #19
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Re: v6 to v8 advice

Meth cools I think more so than boosts octane, the cool part is what works due to not having an intercooler you need to cool down the air coming in cuz its HOT
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Old 02-25-2011, 05:13 PM   #20
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the V6 with just those mods will not compete with a 99+ stock 4.6L in performance but the 96-98 4.6L's were VERY slow in anywhere near stock form.
Well I know it will have me in performance but I also want to try do do all my mods under about $10,000 and with my list right now I'm at about $9,108. I just think it could be to expensive and I've been hearig the performance on the 4.6 isn't the best either.
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Old 02-25-2011, 05:14 PM   #21
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Re: v6 to v8 advice

yup you are correct, for 10k you could sell your car and buy another car with a much better platform and not lose all that cash on mods as you cant get that money back or you end up getting VERY little back

Thats why I decided to not do any heavy mods to my 01 v6, just the normal bolt ons. Then I saved and got my 03 cobra after college and I couldnt be happier... it sucks not modding for a while but in the end its better.
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Old 02-25-2011, 06:13 PM   #22
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Originally Posted by SpectorV
Meth cools I think more so than boosts octane, the cool part is what works due to not having an intercooler you need to cool down the air coming in cuz its HOT
It does boost octane to an extent but more so if you run straight meth but yes mainly lowers temperature thus condensing the air allowing more air to be pushed in allowing the turbo or s/c to run higher boost levels...
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Old 02-25-2011, 06:39 PM   #23
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Ok there are only about 3 things on that list that have power adders to the car. You are almost up to a stock 4.6 gt's HP but put all that money into it. It hard to get power out of those v6 motors. When they stared putting the 4.0 in the new ones you have alot more potential .
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Old 02-26-2011, 01:51 PM   #24
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Methanol injection is pretty much a waste without forced induction
Or nitrous. I spray methanol at the same te as nitrous off same window switch. Bigger shots safely without retarding timing. Works awesome. And I got the cleanest to end around
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Old 02-26-2011, 02:58 PM   #25
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Ok there are only about 3 things on that list that have power adders to the car. You are almost up to a stock 4.6 gt's HP but put all that money into it. It hard to get power out of those v6 motors. When they stared putting the 4.0 in the new ones you have alot more potential .
What are those 3 things? And how much power do you think. But I'm also most likely ganna do a tuner and not the chip.
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Old 02-26-2011, 02:59 PM   #26
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Or nitrous. I spray methanol at the same te as nitrous off same window switch. Bigger shots safely without retarding timing. Works awesome. And I got the cleanest to end around
Yea forgot about those who spray my bad
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