How much boost will a stock bottom end hold?

[93cobra1928]

Nice video! I am hoping to piece together a system for my cobra, still have tons to learn. I hope Coupe will chime in with his knowledge.

[QWKSNKE]

Originally Posted by TurboPete

.
Ive been told rpm is what kills them so Im hoping to push at least 16 psi's on c16 thru a c4 and turn the motor 5600 to 5800 no more then that .
Not sure what it will make but Im guessing somewhere around 530 to 550.

I would be willing to bet that 16 psi of turbo boost will be between 575-600 rwhp

[TurboPete]

Originally Posted by QWKSNKE

I would be willing to bet that 16 psi of turbo boost will be between 575-600 rwhp

Thats what I was thinking as well but since the cam thats going in is really more for a 363 ci Turbo set up turning 6800 Im thinking by turning the motor only 5800 should make a little less. In any case if it makes 570 Ill turn the boost down..


Pete

[QWKSNKE]

Originally Posted by TurboPete

Thats what I was thinking as well but since the cam thats going in is really more for a 363 ci Turbo set up turning 6800 Im thinking by turning the motor only 5800 should make a little less. In any case if it makes 570 Ill turn the boost down..


Pete

Gotcha. Didn't realize the cam was designed for high revs

[coupe]

The X303 is a bit big for a mild 306 build... and really not needed for your combo if you're going turbo. Stick with something simple and you should be okay... Seen a STOCK mustang GT with stock 5.0 intake, TB, MAF, etc... with a 70mm turbo on fairly low boost make right where you're wanting to be: 480rwhp. It was a little lazy so I recommend a turbo somewhere in the 60-62mm range. I would consider a F303 cam or even revert back to a stock cam for it... it will get you the power no problem as long as the other stuff is sorted out and it's tuned well.

I wouldn't waste money or time on the valley or main girdles... it's just not needed unless you're planning on testing the limits...then it does a good job holding the mess together when it breaks... but it doesn't prevent any breakage.

[93cobra1928]

Originally Posted by coupe

The X303 is a bit big for a mild 306 build... and really not needed for your combo if you're going turbo. Stick with something simple and you should be okay... Seen a STOCK mustang GT with stock 5.0 intake, TB, MAF, etc... with a 70mm turbo on fairly low boost make right where you're wanting to be: 480rwhp. It was a little lazy so I recommend a turbo somewhere in the 60-62mm range.

Any hope of finding a junkyard turbo in that size or are junkyard builds
pretty much limited to twins?

[coupe]

First, I will forewarn you about trying to "junkyard" a turbo mustang together: Luck plays a big part in going that route and I've never seen anyone with enough luck to actually end up with a decent budget "junkyard" kit that actually works well. You will probably still have a bunch of money in getting it right after encountering problems.

If you're looking to make 450-500rwhp on a junkyard budget, I think you should find a used S-trim Vortech then drop in a 255 pump, some 42's, a bigger MAF, and a tune.

[qkjuicedpony]

Originally Posted by coupe

If you're looking to make 450-500rwhp on a junkyard budget, I think you should find a used S-trim Vortech then drop in a 255 pump, some 42's, a bigger MAF, and a tune.

This.


S-trims can be had for really good deals right now

[qkjuicedpony]

Originally Posted by coupe

I wouldn't waste money or time on the valley or main girdles... it's just not needed unless you're planning on testing the limits...then it does a good job holding the mess together when it breaks... but it doesn't prevent any breakage.

This too.

The intake manifold is the best valley girdle you can get...The motor wont fall apart until you take it off

[Procharged87]

Originally Posted by coupe

If you're looking to make 450-500rwhp on a junkyard budget, I think you should find a used S-trim Vortech then drop in a 255 pump, some 42's, a bigger MAF, and a tune.

I definately agree, especially if you aren't certain what your final goals are for the car yet. It's a pretty simple bolt on type install and will make a massive difference. If you decide you want something different later on, you can usually get almost all of your money back out of a used S-Trim kit as long as you keep all the pieces together and take care of it. Also, don't forget that once you cross certain power levels, the block isn't the only thing you have to worry about. The trans, chassis, and suspension needs all go up with power levels too.