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Old 09-20-2014, 09:48 PM   #1
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Doing a top end build.

Hi, new here.

So I have a 1999 5-speed GT with 7000 miles on the Ford-remanufactured engine, and I'm getting ready to build up the top end. Trick Flow Twisted Wedge 38cc heads, Comp cam, Accufab intake plenum, etc. I'm hoping to end up pushing 400+ flywheel horsepower after a tune. I've already got JLT CAI, MAC ceramic longtubes, X-pipe, high flow cats, Borla Stingers. (And just finally got an SCT X4 and loaded the 91 octane tune the other day, man that really woke it up!)

I'm not doing the work, I don't trust myself to do it right. Paying a performance shop. Is that 400 HP number a pretty good estimate of where I should be at? My biggest question is actually, is this too much for a stock bottom end? Rods and pistons? I know those are kind of the big weak link in these 4.6L modulars.

I'm guessing the T-45 tranny should hold up just fine.
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Old 09-20-2014, 10:25 PM   #2
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You might make it to around 400 bhp. The dyno number is just that... A number.
It's an effective tool to use when tuning a car.
That should be a fun engine but don't get your hopes up to high for a big wheel dyno number.

Your engine and transmission will hold up fine at that power level.
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Old 09-20-2014, 10:50 PM   #3
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Good to hear, thanks for the input! My 400 HP guess was based on this Trick Flow 390 HP rating kit:

http://www.summitracing.com/parts/tf...view/make/ford

When I talked to the guys at the speed shop, they said it's not a bad kit but they think they could do better (and maybe even cheaper) by sourcing components individually. Like they'd use those heads, but a better cam, etc. That combined with an Accufab plenum and the rest of my existing bolt-ons, was assuming 400 bhp is reasonable after a good dyno tune.

Gonna be awesome no matter what I'm sure. This is my third Mustang, always wanted to do some real motor work to the first two. Now that I can actually afford it, I'm pumped. I'm pretty lucky having only 7,000 miles on the motor too, so it's a great time to do it. The motor even still is warrantied, but uh.. top end build is probably going to void it. Whatever... worth it!
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Old 09-21-2014, 12:48 AM   #4
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Like stray said your ballpark bhp number will most likely be around what your thinking. Could be a little shy of that, but I'm sure anything close to the? 400 mark and you should be happy. It will be a great running mustang for sure and sound Awesome with the cams which is always satisfying if you ask me. I too have debated having a Shop do PI heads, ported, basically the whole PI swap in my case. If I may ask how much is the labor they quoted you?

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Old 09-21-2014, 12:50 AM   #5
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Doing a top end build.

400 flywheel is going to be about 330whp.

For that you are going to need full bolt ons, and good heads, and cams.


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Old 09-21-2014, 01:42 AM   #6
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Like stray said your ballpark bhp number will most likely be around what your thinking. Could be a little shy of that, but I'm sure anything close to the? 400 mark and you should be happy. It will be a great running mustang for sure and sound Awesome with the cams which is always satisfying if you ask me. I too have debated having a Shop do PI heads, ported, basically the whole PI swap in my case. If I may ask how much is the labor they quoted you?

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Cammed Mustangs sound incredible, no doubt! It's going to be interesting to see how I'll stack up against the Coyote 5.0s and newer Camaros. Hopefully will be able to give them a solid run. I've definitely got a weight advantage.

As far as labor, I don't have a final quote yet. They're getting one ready for me, but after just talking to them a bit it seems like a ballpark figure for labor AND parts is going to be around $7000 or so. Parts are probably going to be near $4000 I'd guess.

If you do the PI swap, you will not regret it I'm sure. You actually might just want to go with Trick Flow Twisted Wedge. From what I understand, they're about the best you can do for our motors as far as heads go.
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Old 09-21-2014, 01:49 AM   #7
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400 flywheel is going to be about 330whp.

For that you are going to need full bolt ons, and good heads, and cams.


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Okay, well I don't have "full" bolt-ons. Just what I mentioned in the first post, but yeah Twisted Wedge 38cc heads and probably stage 2 Comp cams will be going in there. I'll be pretty satisfied if I just see 315+ whp or better.

Maybe next year I will build the bottom end, get forged pistons and rods and go for a T-56 or TKO 600 trans and slap a Vortech V-3 on. Maybe. That is going to get pricey, but man I'd be able to kill basically anybody on the street.
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Old 09-21-2014, 02:34 AM   #8
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Don't waste your money trying to make a 2v 4.6 fast.

You will still get raped by any 4th gen LS1 F-body with more than a tune and a decent driver, also the 5th gen Camaro and 2011+ 5.0 will have no issues putting car lengths on you, completely stock.

Even S/C you will get beat down by any cammed LS1 or any tuned 5th gen Camaro or 2011+ 5.0.
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Old 09-21-2014, 02:41 AM   #9
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Yeah, but how will we fare against soccer moms in mini-vans?
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Old 09-21-2014, 05:16 AM   #10
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How much H.P. does a 2011+ 5.0 Mustang have...stock ? I could of swore I was reading something the other day that said they were 345 H.P. stock. Not sure...but if that's true...I would think a S/C 4.6 with the upgrades he mentioned would fare really well against it.
Of course if the 5.0 has upgrades too it's a whole new ball game.
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Old 09-21-2014, 11:50 AM   #11
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How much H.P. does a 2011+ 5.0 Mustang have...stock ? I could of swore I was reading something the other day that said they were 345 H.P. stock. Not sure...but if that's true...I would think a S/C 4.6 with the upgrades he mentioned would fare really well against it.
Of course if the 5.0 has upgrades too it's a whole new ball game.
Generally the Coyote 5.0's are putting down 365 - 380 at the tires depending on the dyno. With just a tune and a few bolt ons they are generally right at 400 to the tires.

A 2v 4.6 generally puts down 215 - 230 at the tires. With a Vortech S/C and a great tune they are putting down around 380 at the wheels.
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Old 09-21-2014, 11:54 AM   #12
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Quote:
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Don't waste your money trying to make a 2v 4.6 fast.

You will still get raped by any 4th gen LS1 F-body with more than a tune and a decent driver, also the 5th gen Camaro and 2011+ 5.0 will have no issues putting car lengths on you, completely stock.

Even S/C you will get beat down by any cammed LS1 or any tuned 5th gen Camaro or 2011+ 5.0.
It'll be fast enough for me to have fun even with ~400 bhp. Sometimes I wish I had just saved up for a termi though...
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Old 09-21-2014, 11:57 AM   #13
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It'll be fast enough for me to have fun even with ~400 bhp.

That is the way to think

As long as you are happy, that is all the matters. Let the LS1 or newer gen camaro keep rolling, nothing to prove but that you are having fun.
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Old 09-21-2014, 03:44 PM   #14
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SRT4 KILLER
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Old 09-21-2014, 03:56 PM   #15
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Yeah, the way I see it is no matter what you do or have something will always be faster than you. It'll be respectable after the top end build. Next thing I spend money on will probably be some new wheels. Look at those ugly alloys in my avatar, ugh. I want 10.5" in the rear anyway. The stock ones already spin a small bit most of the way through first gear just after uploading the 91 octane tune.

I think later tonight, I'm gonna go out for a drive with the SCT X4 plugged in and and datalog a 0-60 run so I can compare before and after.
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Old 09-21-2014, 05:22 PM   #16
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I went with the 17x10.5 in rear with 17x9 up front. The tires are 315/35 out back with 275/40 up front. The back transformed the cars looks greatly. When looking from the rear, the tires are massive to look at. And the stability increased greatly. And have no rubbing or interference what so ever too. I picked mine up from AM.
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Old 09-21-2014, 06:12 PM   #17
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get 18's
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Old 09-21-2014, 06:24 PM   #18
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get 18's
Not enough tire sidewall for my liking. More harsh of a ride on rough roads like here in PR. Prefer having a bit more sidewall to help cushion some of the blow.
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Old 09-21-2014, 10:09 PM   #19
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When I get wheels, I'm probably going with this kit:

Staggered Chrome 2003 Cobra Mustang Wheel & Sumitomo Tire Kit - 17x9/10.5 (99-04) - Free Shipping

I always liked the looks of those. And I agree with grumpy about the 18s, even though they look good.
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Old 09-21-2014, 10:44 PM   #20
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Those tires suck and 18's look good
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Old 09-22-2014, 07:34 AM   #21
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I have the same tires and I have no problem what so ever with them. Wet and dry and cornering they perform great. This is my 2 or 3rd set of these tires and they wear good.
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Old 09-23-2014, 10:15 AM   #22
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17s look like roller skates, if you want more sidewall get more sidewall. I run a 235/45/18 up front and a 275/40/18 out back. Feel like stock tires as far as impacts over bumps.
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Old 09-23-2014, 03:09 PM   #23
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Sumitomos are good as long lasting tires. But when it comes to performance they are straight up garbage.

Ask me how I know


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Old 09-24-2014, 09:17 AM   #24
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Hmm, maybe I should go with the Nitto kit. How are those in rain/snow?
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Old 09-24-2014, 01:00 PM   #25
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Hmm, maybe I should go with the Nitto kit. How are those in rain/snow?
The 555s are good in the rain, as a summer tire they are not meant for below freezing or snow. If you are talking about the 555R or the NT05... lol.

If you are worried about rain/snow then get an all season. The best all seasons out there that will not murder your bank account are the Continental Extreme Contacts.
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Old 09-24-2014, 01:38 PM   #26
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He's probably talking about the 555s.

They are good in rain and long lasting but are garbage in the performance department.


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Old 09-24-2014, 01:53 PM   #27
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Buy a good snow tire set up and a good summer tire set up if you drive your car year round. Yes its extra money but you will enjoy your car year round rather then sacrificing to have all seasons
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