Bolt on upgrades to increase HP for 01 Bullitt

[JZ67]

After some consideration, I would like to keep my car and upgrade performance.


The car was a factory V6 that now has a 4.6L Bullitt engine. Pretty well bone stock with the exception of a K&N air filter and I have no idea if that is actually an improvement over stock.

I have owned the car for 5 years and pretty well dealt with all the cosmetic items that I could have and would like to increase the HP. Did a dyno pull last year at Dasilva netting 248 to the wheels. I have to say, the whole crew at Dasilva's are a bunch of awesome guys. Joe said we could get the car to 400HP with some bolt ons and a tune. I would like to start the journey to 400. I realize this is modest compared to most of your cars but I drive this car about 500km per summer and just want to enjoy it with some more giddy up.

Anyway, looking to do some tinkering on my own and trying to work with at $1500 budget. So, this is what i am thinking:

Underdrive pulleys
Cold Air Intake
Cat back exhaust - should I take out the cats?
Tune

I would appreciate some input from some experienced folks here. I am a white collar guy with a bit better than entry level wrenching skills. I don't think that list is going to get me to 400, what else do I need? Will it fit my budget?

Thanks
Joe

[Ghost Rider]

put a gear in it, I believe stock bullitt is 3.27, dropping in a 3.73 or 4.10 will give you gains... not in power per say, but how the car gets that power you already have to the ground! More responsive, will feel more peppy...

Cat back sure... mainly for sound... pick up a couple pony's though, biggest gain in this area will be from changing the midpipe and I suggest staying catted with a high-flow

CAI + filter is all easy DIU mods

Underdrive pulleys won't add HP but it will help to free up the power you have a bit...

You could do a Short Throw shifter, again, not adding hp but will make your 500km a lot more enjoyable to drive :)

[Ponyryd]

I agree gears is the best for a seat-of-the-pants improvement, 4.10s in that car will give a good kick and won’t be too bad in the highway at all. Bullitt comes with underdrive pulleys, I would leave those alone personally, but do a cold-air intake. $1500 is done with these mods.
Cat-back exhaust is a good mod, as well as a catted h, or x-pipe, but you’re gonna have to choose if you want the sound of power, or the feel, cuz $1500 is what a good exhaust costs.

[bbriann]

Yes gears is biggest kick for your money for sure.
FYI FULL bolt ons including trickflow ported heads and bore and stroked to 323 CID and 11:1 compression I had 370ish rwhp...you wont get 400rwhp unless very large sized compression ratio and lots rpm...with race fuel
Not making it streetable.

[JZ67]

Yes gears is biggest kick for your money for sure.
FYI FULL bolt ons including trickflow ported heads and bore and stroked to 323 CID and 11:1 compression I had 370ish rwhp...you wont get 400rwhp unless very large sized compression ratio and lots rpm...with race fuel
Not making it streetable.

Thanks everyone, and thanks for that detail Brian. I didn't see how the bolt ons I listed would get it there either. Maybe add 20 - 40 with the tune but not 150.

So looks like I am doing gears and that doesn't look like a fun task for me...time to engage a pro.

[fast Ed]

Unless you're considering a blower kit a bolt-on, 400 hp from a 2V is a very tough go as Brian mentioned.

[Zippy]

+1 on gears.

[ZR]

Gears + Kenne Bell supercharger n hang the hell on.

[JZ67]

So I got my hands on 4.10 gears and plan on having them installed soon. Does anyone have the handheld tuner to reprogram the speedo? Willing to pay for the services.

[dbovine]

you might be able to do this with Forscan software if you order a $40 USB ODBII reader. THere are BLuetooth ones as well.

I ordered the USB one, interested to see what I can do

[JZ67]

you might be able to do this with Forscan software if you order a $40 USB ODBII reader. THere are BLuetooth ones as well.

I ordered the USB one, interested to see what I can do

Thanks, I'll check that out.

I'm getting conflicting information. Some are saying speedo calibration is a must do and others are saying it's not (internet search - not this forum). So other than the speedometer being off, are there any serious implications?

[bbriann]

So I got my hands on 4.10 gears and plan on having them installed soon. Does anyone have the handheld tuner to reprogram the speedo? Willing to pay for the services.
You will need a SCT tuner specific for your year of mustang, some sort of programmer and do it yourself, its easy. You can use the custom tune that comes with it for your car at this time if car is stock. Later if modded you can use it for dyno tuning. Some places like Steeda offer free custom tune when you purchase tuner from them. The tuner becomes married to your car so nobody can use theirs to correct your speedometer

[Hotford]

Unless you're considering a blower kit a bolt-on, 400 hp from a 2V is a very tough go as Brian mentioned.

that's the only way he's gonna see 400 hp is with a blower, still considered a bolt on...…..me personally would junk that 2V, and drop in a coyote, after you spend modding that 2V the coyote stock will make the same HP N/A!!

[JZ67]

Once the gears are in, does the speedo need to be calibrated immediately? Any harm if the speedo is calibrated at a later date?

[bbriann]

Once the gears are in, does the speedo need to be calibrated immediately? Any harm if the speedo is calibrated at a later date?
No harm to vehicle. My street tires are 28 inch and track tires are 27 inch on rear , just speedometer wont read correct.... I dont correct speedometer while at track. The silly traction control I have turned off using tuner also. Like mentioned before with more less stock car ensure you get a sct tuner that has free mail order tunes or tunes preloaded specifically for your car. Dyno tune of course is always better but not necessary for a stock car...I don't recommend nitrous but I used it for several years and was running high 11s on mail order tunes...but I Do Not recommend nitrous I just saying mail order tunes do work and come with purchase of tuner from certain sellers.

[Nsty04SVT]

I would start with picking up a SCT Programmer, Gears (either 3:73 or 4:10) and pick up a new shifter, I prefer the MGW but there are other options as well....top it off with a S/C and boom 400hp should make for a super fun ride.

Just an fyi cost wise the SCT programmer will set you back $450 and the tune is going to be around $500, Dasliva or Steeda will be able to hook you up with everything you need.

[JZ67]

Had the 4:10's put in and I really don't love it. I do notice a bit more pull on the low end but don't enjoy the high rpm's and power loss on the high end. I'm going back to stock gears.

[bbriann]

Hmm that's too bad. I changed to 410 gear from 430 gears but have 28 inch tires on rear on street. I think I'm around 2000rpm at 60 mph.

[JZ67]

I'm at 2500 rpm at 100kph. At 120kph (avg hwy speeds) I'm at 3000rpm.

[bbriann]

There is rpm calculators on web that tells you what your rpm will be when changing gears and tire sizes. I think stock tires are like 25.6, mine on rear are 28 on street.

[SlipperyVic]

That's a real bummer. I've fought with going 3.73 or 4.10's for my car and I was leaning towards 3.73's before and this confirms it.

[Laffs]

That RPM seems super high. I was only around 2500 RPM at 120kmh on my stock T45 w/ 4.10s IIRC.

What size tires are you running and how was the speedometer calibrated?

[JZ67]

That RPM seems super high. I was only around 2500 RPM at 120kmh on my stock T45 w/ 4.10s IIRC.

What size tires are you running and how was the speedometer calibrated?

Stock 245/45/17. Speedo wasn't calibrated. Forgive my ignorance, how would speedo calibration impact rpm?

[bbriann]

The rpm will be accurate at if actually doing 60 mph.rpm guage will always be accurate.

[Laffs]

Stock 245/45/17. Speedo wasn't calibrated. Forgive my ignorance, how would speedo calibration impact rpm?

If your speedometer is off how would you verify you are actually going 120kmh? RPM would be accurate regardless of indicated speed yes.

Based on this calculator you should only be turning 25xx rpm

https://www.cjponyparts.com/resources/engine-rpm-calculator

[Stephen06GT]

Stock 245/45/17. Speedo wasn't calibrated. Forgive my ignorance, how would speedo calibration impact rpm?

Do you have a GPS you can use to confirm your actual speed?

[JZ67]

At 60mph (gps measured) the rpm was at 2500.

[Stephen06GT]

At 60mph (gps measured) the rpm was at 2500.

5th gear?

[JZ67]

Sorry, I neglected to mention that I was using a gps to determine actual speed/rpm.

[JZ67]

5th gear?

yup

[Laffs]

T45 or 3650? Also what did you mean by high RPM power loss?

[JZ67]

T45 or 3650? Also what did you mean by high RPM power loss?

I believe it is a 3650.

To me, it felt like there was less punch at high speeds when getting the pedal.

[Laffs]

Likely the result of you being higher in the power band at the same speed and being past peak torque so you don't feel the same down low punch. Gears are really felt off the line vs. roll racing speeds.

3650 should put you on 2700rpm at 74mph.

[Stephen06GT]

Crunching some numbers:

Based on 2500 RPM with 4:10s = 2275RPM with 3:73s=2165RPM with 3:55s and 2000RPM with 3:27s

[JZ67]

Crunching some numbers:

Based on 2500 RPM with 4:10s = 2275RPM with 3:73s=2165RPM with 3:55s and 2000RPM with 3:27s

I was at 2000 rpm at 60MPH in 5th gear. 3:27's going back in right now.

Anyone want some 4:10 gears?

[MUSTANGWOP]

How much for the 4.10's and what brand?

[JZ67]

How much for the 4.10's and what brand?

Ford Racing $175.00