408 STROKER FORD TURBO BUILD & DYNO. TURBO ON TURBO ACTION. HOW MUCH POWER DOES A TURBO 408 MAKE?

74 VS 80 MM TURBO TEST. FULL DYNO RESULTS & BOOST CURVES. HOW MUCH BOOST CAN I RUN ON A 351W FORD? IS A STROKER BETTER FOR BOOST? HOW MUCH BOOST WILL MY TURBO MAKE? WHAT HAPPENS WHEN THE TURBO IS TOO SMALL? WILL A BIGGER TURBO MAKE MORE BOOST? WHAT HAPPENS TO THE BOOST CURVE WHEN YOU UPGRADE THE TURBO? CHECK OUT THIS VIDEO ON THE BUILD UP OF A NATURALLY ASPIRATED 408 FORD (351W) STROKER. THEN SEE WHAT HAPPENS WHEN WE TRY A SMALLISH 74 MM TURBO, THEN UPGRADE TO A LARGER 80MM TURBO. WHAT HAPPENS WHEN WE TRY TO INCREASE THE BOOST WITH THE SMALL TURBO? THEN, WHAT HAPPENS WHEN WE TRY TO INCREASE THE BOOST WITH THE BIGGER TURBO?

[brianmaynard]

Thank you for this!! Love the small block Ford!!

[davidresar]

Richard, you are correct! The smaller turbo only had capacity for down low. The bigger turbo has capacity for the whole range. Therefore, your testing clearly shows the smaller turbo is running out of airflow. Great video! Now, where was that 88mm???

[dennis]

Very nice! My 410w with a precision 7675 through a 6r80 laid down 751whp 704 wtq @ 12.88lb of boost in 93 octane. Need to get stiffer waste gate springs for more boost.

[stigastondogg]

I know this is an older video but in case people are still watching -
Forget boost numbers
What you want is air flow
The smaller turbo can’t produce the air flow for the higher rpm engine demand (ie the engine vacuum is reducing the pressure in the intake).
Lower rpm it can push more air than the engine can suck in - so when the engine opens intake valve there is more air to consume = more power.

The bigger one did it easily for the full rpm range, and as you saw the engine at 11psi was no different because the airflow hadn’t changed. When you asked for more airflow from the turbo, it was able to do so at a surplus to what the engine naturally wanted - so the pressure is able to build up in the intake.

You can have low boost numbers and make more power than the opposite; if the intake from air filter to valve is incredibly efficient.
Aim for air flow first, and the boost will take care of itself.

[tomhamilton]

Thank you SB Ford stuff keep it coming.

[stuartdrager]

The 351 Windsor and Cleveland thirsty engines, good cylinder heads on them and nice valves, , and, with the solid camshaft and lifters give the small block Windsor a big dose of medicine, there tough as nails it would handle the punishment, they can make big power when tweaking and the settings are done, 3000hp if built right

[fgialcgorge]

Pretty crazy. I just started a 351 build for my AWD crownhick project. I've been wondering about turbo vs NA. I actually settled on a slightly smaller turbo because I need that low rpm power and particularly torque. I live up in the mountains with steep hills and winding roads all the way home from work, about an hour of it. We also get a lot of snow so I had to go AWD, plus AWD is just fun. Great video.

[DillonAuto]

I apologize for the tangent, but I used a Comp Turbo sourced upgrade for my Supra. I was pleased. Now, on to your video.

[johnb]

Love seeing the Ford stroker info.


Ring gap!

We know boost needs more to deal with the heat. But i don't recall seeing the NA power vs ring gap as a dyno test.

[danielschulze-wulq]

I’d like to see u try Anderson cams for your fords

[brawler.]

Just built a 351w with a vs7875 and i love it in a fox body mustang has awesome power.. i built this motor around your videos 👍👍

[GreenCrim]

If we think of the intake manifold as a pressure vessel the turbo is filling up to a certain pressure, and the engine as a leak that gets bigger as RPM increases, if the turbo is too small eventually it can't keep up with the 'leak' so the manifold pressure starts to fall. Put a bigger compressor feeding the manifold and problem solved.

[luketilley]

Awesome. JMS buit a 30 over factory stroke 351w with 2 of the smallest turbos Precision Turbo makes and that combination made a little over 1, 100hp

[HarleyDynaFXD]

We are doing a similar project for our 70's Econoline tow van but our compression ratio is 8.5:1 instead of 9.5:1 for more boost and its 410 CI SBF "2 CI is not much different" thanks Richard for this test I just need a lot of torque for towing 😂

[richardtyler]

Richard, please do a stroker with Kaase C-400 CHI heads.

[takeit-]

McLovin it! That turbo bonnet/box is pretty cool. turbo magnum! turbo magnum! turbo magnum!

[timweb]

I thought I was foolish running a 70mm on my 351w but my tubular intake, trickflow stage 1 cam can’t take advantage of the rpms anyway

[shane-]

Great video! The turbine couldn’t keep up. Try adding a second!. 🎉😉

[matthewdeluca]

Do you remember how many cc those pistons were dished? I am putting together a 408w with AFR heads but with the smaller combustion chambers, I believe they are 58cc.

[RyTrapp]

Ayy Richard, are we going to see some Coyote intake testing in the future? There's a LOT of options on the market all of the sudden especially with Holley dropping a Hi-Ram & Ultra Lo-Ram now, and the Coyote is as popular as ever too.
(my inner Ford Modular fanboy weeps - NEVER had intake options like this, even the Godzilla already has more intake options I think LOL)