First steps...

[V8Compact]

Ok. I was just wondering what it would take to hit 250hp~ with this set-up:

I plan on eventually using a custom cal for everything, but I'm working on stock computer stuff for now. This being said, I'm going to stay at stock boost level. This means I won't be hitting 250 HP, but I figured any horsepower increases that are reasonable would work for now.

I'm getting a 2.5in swing valve, a one-piece intake manifold, and a later exhaust manifold. I'll be using a stock Garrett turbocharger for now. I plan on adding an intercooler to the set-up (not sure which). Here are the questions I have:

1. With the current set-up, what can I expect with stock boost, stock injectors, stock computers with the 86 Daytona, up-sized swing-valve, boost controller, intercooled, and (eventually) stock exhaust except for a larger cat-back exhaust? Will the turbo be inhibited by a muffler? What muffler would one suggest for this set-up?

2. How would one go about getting 250~ CHP (that's crank horsepower... how much would that be to the wheels?) considering cost, drivability, reliability, and OEM look being the order of importance...

[tkelly27]

Are you getting the 2.5" swing valve from a junkyard or from a vendor? You'll regret not getting the 3" if its from a vendor. Not that you can't make the power you are looking for with the 2.5", it will be easier with the 3". From what I've heard, if you are going to go with a 1 peice and an intercooler you either need to keep the boost @ 10ish, or get a calibration that will give you enough fuel. I'm pretty sure you can grind your current T1 manifold, just like you'll have to do with your T1 turbo. Read www.thedodgegarage.com a few times : )

[Shadow]

Walbro fuel pump, FWD recal, +40 inj's, 3 bar map with the stock regulator. Set your boost to 16 on premium fuel(always) and your good to go!

[V8Compact]

I'm just using the 2.5" swing valve for right now. I'll eventually bump up to 3" once I am looking at big power. Which Walbro pump you suggest? And why 16 pounds

[tryingbe]

Quote:

Originally Posted by V8Compact 1. With the current set-up, what can I expect with stock boost, stock injectors, stock computers with the 86 Daytona, up-sized swing-valve, boost controller, intercooled, and (eventually) stock exhaust except for a larger cat-back exhaust? Will the turbo be inhibited by a muffler? What muffler would one suggest for this set-up?

TI stock hp is aruond 148hp, that's with 8psi, I believe.

TII stock hp is around 174hp, that's with 12psi.

So, you'd be somehere between that.

[tkelly27]

Get the walbro 255. Its like $10 more and you will unlikely need to upgrade to a bigger one ever again. I'm saying IF you are ordering a swing valve (which I assumed you were because you have a 2.25" one right now if you have a T1), then don't mess around with the 2.5". If you just happened across a 2.5", go for it : D Go with 16psi because its a bump in power but not so far away from stock that you are going to blow up your engine doing it every day.

[V8Compact]

Quote:

Originally Posted by tkelly27 Get the walbro 255. Its like $10 more and you will unlikely need to upgrade to a bigger one ever again. I'm saying IF you are ordering a swing valve (which I assumed you were because you have a 2.25" one right now if you have a T1), then don't mess around with the 2.5". If you just happened across a 2.5", go for it : D Go with 16psi because its a bump in power but not so far away from stock that you are going to blow up your engine doing it every day.

I may very well do that when I get the custom cal. I probably will go with the bigger fuel pump, but my question is this: what will having a bigger pump do? Allow for higher fuel pressure? Or does it simply support more power? I can always just ask this as I go along with the project. The more time I have, the more I dream... better brakes, suspension, ect. It's a car worth the money.

Btw... I believe power peaks out at 5k in stock form, right?

[Koreth]

The bigger pump is capable of supplying a greater volume of fuel. If one tries to make too much power over stock levels with the smaller pump, it will not be able to keep up with the demand and the motor will run lean.

[tkelly27]

"Stock fuel pumps seem to be adequate for engines making horsepower in the 270-290 hp range; over that is the deadly risk of Russian roulette with your pistons!" from the dodge garage. Bigger fuel pump gives more flow at a given pressure and can normally handle more pressure. Even though the stock pump can handle the 250hp, most of the stock pumps are 15+ years old. I was also under the impression that bigger pumps don't have to "work" as hard so they lead happier lives, mayby someone could corroborate that.

[tryingbe]

$120 pump is cheaper than buying pistons because you used a stock pump.