Big Bore Boss build

[Surfstang2020]

I would like to see about 425hp, 425tq. The only problem with the 5.4 is the lack of intake options.

Thanks.

Is there no one that cust I m makes manifolds that would work ?

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[BruceH]

I would like to see about 425hp, 425tq. The only problem with the 5.4 is the lack of intake options.

Thanks.

The 2013 and 14 GT500 has a 5.8 liter mod motor, 358 cubic inches. IIRC it's a 3.700 bore x 4.165 stroke and it has the excellent GT500 heads. Bump the compression with some custom pistons and it should shine. I'd think that a Cobra R intake would work. They pop up on ebay.

I think you could do 425/425 with a 5.3 Big Bore. I was at 437/388 but I had the FRPP intake on. It helps with higher airflows but it takes away torque. I also had mid length headers with cats. A set of AR long tubes would probably add to the numbers. I also did my own tuning. A real tuner could probably get more out of it.

 

[SStang]

The 2013 and 14 GT500 has a 5.8 liter mod motor, 358 cubic inches. IIRC it's a 3.700 bore x 4.165 stroke and it has the excellent GT500 heads. Bump the compression with some custom pistons and it should shine. I'd think that a Cobra R intake would work. They pop up on ebay.

I think you could do 425/425 with a 5.3 Big Bore. I was at 437/388 but I had the FRPP intake on. It helps with higher airflows but it takes away torque. I also had mid length headers with cats. A set of AR long tubes would probably add to the numbers. I also did my own tuning. A real tuner could probably get more out of it.

Yea I totally forgot about the cubic increase, I remembered on the way home tonight, didn't know the bore size, that is awesome. I always liked the ideal of a NA 5.4/8, and I also remembered that there are adapters to use the 5.0L intake with the 4V heads. Now I have to find a price for the block, not going to be cheap.

Thanks.

 

[BruceH]

http://www.tascaparts.com/ford/must...ine-cat/engine-scat/?part_name=cylinder-block

$5092 from Tasca for the block. $8900 for the shortblock. You could get the whole 5.3 shortblock for that price. It is about 35 inches less though so that's about $100 a cubic inch in shortblock form.

 

[mike4.0]

I always thought the deletes were for guys going F/I. I think I remember seeing F/I guys breaking the pedals off and doing not nice things to the motor.

This is what I've read about and seen a few pictures from.

Sidenote - I have to stop reading your posts lol just makes me want to rip my motor apart, bore it out and then take a crack at tuning

 

[BruceH]

This is what I've read about and seen a few pictures from.

Sidenote - I have to stop reading your posts lol just makes me want to rip my motor apart, bore it out and then take a crack at tuning

Nothing that I have done is very difficult. It requires paying attention to detail, educating yourself, and some help for things that aren't covered or are unclear in the manuals but it's all doable. The research, reading, and verifying take the most time, assembly and installation are fairly straight forward.

Tuning takes a whole lot of reading and experimentation. I screwed up plenty of tunes but it never resulted in catastrophic failure because I never used parameters that were on the edge. Learning what affects driveablility is the most difficult part imo. It basically involves making sure the motor always has close to the correct amount of air going into it at lower loads. All the things that used to be mechanical adjustments are now somehow controlled via the tb blades. Cams and aftermarket throttle bodies have affected driveability the most for my setups.

The worst thing that happened was when I accidentally put the stock tune on (different motor with a Procharger at 19psi). I was running e85 at the time so there was no danger of detonation. Paying attention to the fuel trims revealed that something was wrong fairly soon after I had made this mistake.

There are plenty of people with experience who are willing to help if asked.

 

[Saleen S281]

The 2013 and 14 GT500 has a 5.8 liter mod motor, 358 cubic inches. IIRC it's a 3.700 bore x 4.165 stroke and it has the excellent GT500 heads. Bump the compression with some custom pistons and it should shine. I'd think that a Cobra R intake would work. They pop up on ebay.

Wow, I've always wondered about that, if the Cobra R intake manifold would work on a 5.4 DOHC motor, has anyone done this?

 

[ford20]

Wow, I've always wondered about that, if the Cobra R intake manifold would work on a 5.4 DOHC motor, has anyone done this?

Not to intrude on Bruce's thread but if I am remembering correctly FPV has a N/A version of the 5.4 4V in one of their cars. It might be worth a check down south to see if some performance shop has an improvement on the factory one or if a factory intake would be sufficient.

 

[BruceH]

Wow, I've always wondered about that, if the Cobra R intake manifold would work on a 5.4 DOHC motor, has anyone done this?

Ford did it with the Cobra R, lol. I think you would get more out of a 5.3 big bore vs a 5.4 na.

 

[ford20]

Ford did it with the Cobra R, lol. I think you would get more out of a 5.3 big bore vs a 5.4 na.

Yup. If I recall correctly wasn't spyder at something like 420 HP through a race transmission and like 4.30 gears and GermanSheppard was right behind him with a less radical build.

 

[BruceH]

I'm posting a picture of how the engine bay looks at present. It looks like a stock motor with a cai and valve covers. Very stealthy. The engine wire harness has been changed out to a brand new one to help with the stock look. The original harness works just fine but it had been lengthened and shortened a few times over the course of my different setups. I wanted all the lengths to be where they should be and just didn't feel like rebuilding the original harness.

http://s635.photobucket.com/user/1Mustang32/media/IMG_2702_zpsr0aaagzr.jpg.html

 

[Doug M]

Looks good Bruce! Glad to see you active and giving advice again, even if you're wanting to sell...good luck with it all.

 

[BruceH]

Looks good Bruce! Glad to see you active and giving advice again, even if you're wanting to sell...good luck with it all.

Thanks. I do enjoy the forum and I especially enjoy sharing what I've experienced and learned along the way.

This is by far the best Mustang based forum I've been involved with. Not putting any other ones down, I'm sure there are plenty I haven't seen but for the ones I've been involved with in the past this is #1.

There is a large repository of information contained here. Many people have taken the time to post what they are doing, what worked and what didn't.

In a nutshell I'd say that the quality and honesty of the membership is what makes this site so special. People do advanced modifications to their cars and let us follow along.

The biggest negative about this site is that it motivates us to spend money modifying our cars. I suppose that's a positive for people selling parts, lol.

Right now I'm thinking about how easy it would be to install a centri. I have plenty of low end grunt which means an inexpensive centri like a Paxton tuner kit would extend everything out in the power band.

I have absolutely no reason to do this, it makes no sense, the car is really in a nice place power wise. Yet I still feel the need to do "something". Crazy.

 

[Doug M]

If it makes you happy, go for it!

 

[wabirch]

Fantastic thread, answers galore for a similar build down the road for me. Looking great Bruce.

 

[BruceH]

Updating this thread with some more info.



Some time ago I put a stock intake manifold with cmcv back on the motor, also went back to factory cats.

The only apples to apples comparison would be with E85. Changing from the FRPP intake, 62mm tb, C&L Racer, and Mac LT headers with high flow cats dropped 40rwhp. Those parts were replaced with a stock intake with cmcv, 55mm tb, Bullitt cai, JBA shorty headers, and stock cats. The power drop occurred above 5k rpm.

The numbers on this sheet represent the old setup with with E85 (438/389), current setup with E85 (397/390), and current setup with 92 octane (387/388).

All of the power drop happened above 5k rpm. This leads me to believe it has to do with airflow. Either in, out, or a combination of the two. It could be the 55mm tb or the Bullitt cai or the stock intake manifold. It could be the exhaust setup.

I'm not really disappointed in anything. Drivability is fantastic, the motor looks pretty much stock, it gets over 18mpg in mixed urban driving (mpg went up 2mpg just by adding the cmcv). I also know that at least 438rhwp is obtainable with a day of swapping parts back.

The motor is built to handle whatever I can throw at it. That could be forced induction or daily driving with pump gas. Maybe one day I'll start swapping parts out to chase numbers again.

I'd be real interested to see what would happen with a different set of cams. Hot Rods or Lunati 21270718 are the two I think about most. The custom cams in the motor now are made for forced induction and locked at a 108 icl.

Having a cam that starts with a lower icl and having functioning phasers to retard at higher rpms should increase power throughout the range. Also having more intake duration should allow the 3.750" stroke to bring more air into the cylinder. It's one of those things you don't know for sure until you try and I'm not motivated enough to try it yet.

 

[AutoXRacer]

Hi Bruce, I was wondering what you were up to. Are you selling your car (signature)?

Are you done with the whole Mustang thing? Whats going?

 

[BruceH]

Hi Bruce, I was wondering what you were up to. Are you selling your car (signature)?

Are you done with the whole Mustang thing? Whats going?

When I find a buyer who sees the value in my car it will sell. Life is fairly dynamic, things change all the time. In my case it's age and a changing body. Most of my free time is spent recuperating from work due to aching joints. This means there isn't much interest in the car on my part. Even when the interest briefly comes back I remind myself that all of my extra money really needs to go into the retirement fund, not into the Mustang.

I'm not trying very hard to sell it, just waiting for someone who will appreciate what's there and how much a 2008 California Special with a forged 5.3 liter big bore motor with cnc heads, cams, a TR-6060, etc. is worth. Mine is priced far below that price imo.

If that person doesn't come along it's not a big deal. The car runs great, I still drive it on weekend mornings, it still gets comments from complete strangers (positive comments).

Anyway, I did the update today for anyone who is researching a big bore, more data is always better. Something that's interesting is that I don't miss the extra power above 5k rpm. The stock intake and cmcv added a little more power below 5k and that's where 90%+ of my driving takes place.

 

[BruceH]

The insanity has returned.

I've purchased a FRPP intake manifold, Saleen high flow elbow, Pypes orh, and Pypes high flow cats.

These parts will be used to regain some or all of the lost power above 5100 rpm.

The plan will start with the FRPP intake manifold. Once it's installed airflow at wot will be monitored to see if there is any and how much improvement. Then the Bullitt elbow will be replaced with the Saleen unit. Then the orh and finally high flow cats on the orh if the orh shows improvements.

Measuring airflow to determine improvements isn't an exact thing. It's subject to the maf xfer function, weather conditions, etc. Still though, it will show something and it will save the dyno for the final configuration once it's determined. I've used airflow measurement during wot pulls to set up cam retard in the past and it worked then.

The intake manifold is prepped and ready to go on. I still had the set of fuel rails I used the last time a FRPP intake was on the motor.

 

[stkjock]

You should just twin snail it