Can I block off the wastegate on my 2000 psd without hurting the turbo? What is to be gained by doing so???

 

Here's a couple of threads on the topic:

https://www.ford-trucks.com/forums/s...d.php?t=226586

https://www.ford-trucks.com/forums/s...d.php?t=225712

 

Thanks for the link! It sounds like disconnecting the wastegate will give me more boost ...but what are the safe upper limits for EGT's.

 

1250 is the number that most people agree on pre-turbo.

 

More boost will lower your EGT's. In general around 1200 degrees is considered the upper limit for normal driving, but spirited blasts up around 1400 won't hurt a thing so long as you keep it brief.

 

Cookie, educate me here if you have the time, and patience. I don't understand how higher boost will lower EGT's? I'm sure you're right, I'm just curious as to the how and why. Are there any downsides? Thanks.

 

I have the time and the patience, the question is do I have the ability.

The reason we maximize the airflow on our diesels is almost entirely to control the EGT's. Remember with a diesel it is the fuel creating the heat and making the power, not the air.

I've seen at least five different intake configurations on two seperate dyno's tested against the stock set up, and none of them made more than 5 horsepower difference. That includes K&N, AFE, TYMAR, and a couple of home made jobs. In fact the 5 hp increase came from running without a filter at all.

Same thing goes with the turbo, you can bolt a ball bearing 38R on to a stone stock engine and will not see a measurable gain in power. All we are doing with our airflow mods is giving ourselves the ability to support more fuel. Sure it feels like more power, quicker spool up, snappier throttle etc., but what is happening is we are squeezing all we can out of the amount of fuel present.

See...told you I wasn't good at explaining things, I'll try an example.

So you are loaded to the gills as you reach the foot of your favorite mountain climb. As the hill gets steeper it takes more and more throttle to maintain your speed, but, as you continue to add fuel the EGT's start to rise, and the load is dragging the RPM's down, so you have to back out of the throttle and take the fuel away to control the EGT's.

The next guy comes along with the same set up as you, only instead of backing out of it he drops down a gear and mashes the throttle. Now this guy is pushing the exact same amount of fuel, but he also has kept the boost up, so he dosen't lose any speed, and his EGT's stay under control even though he's got his foot way in it..

Third guy happens along with the same stuff, but his wastegate is wired shut. He's making more boost from the get go, so he can stay in it longer before it falls off, then when he shifts he's making more boost again, so instead of maintaining his EGT's, they are actually dropping. This guy now gets to add more fuel and not only maintain, but accelerate to the top.

Did any of that make sense? Or am I really as dumb as I feel?

 

Good job Cookie, IMO. I am sponging off everybody else trying to pick up info as I go so it was helpful to understand. Now if you could start with quantumn physics and work our way through the wormhole theory we will be set! We could solve any problem right here in the Diesel Forum.

 

Now here's a question that the answer may be obvious to you' all, but I have to know for sure; Do you plug the red line, or the actuator? It's the red line, right? Thanks!!!!

EDIT: Or why not pull the green line off the intake and disable the whole system. Or will that set a light?

 

Nevermind, I blocked off both sides. The actuator & the line.
Big difference. I put on an ICP mod last week, but still couldn't get over 23 lb's boost. With disconnecting the the wastegate, I make 25 lb's at 3/4 throttle. Haven't had the guts to go further yet, as it's raining real hard here. Thanks everyone!!

 

WAIT a minute, how do you disconnect the wastegate? What exactly is involved? Can someone give me step by step directions for disconnecting?

I have just added my pyrometer, boost and tranny gauges in an A-pillar setup and I just think my Tymar intake is the greatest. You know that turbo surge is not really that bad.

Greg

 

Very simple. Disconnect the red plastic line that plugs into the wastegate actuator on the right side of the turbo. I got 2-5/32" plugs from Discount Auto and plugged the red line and the actuator.

 

Pictures anyone?

 

Thanks Cookie. I think I got it. Thanks for taking the time to do all that typing.

 

No problem. Fluid dynamics...or higher education in general aren't really my specialty, but I have been spinning wrenches for a long time so how stuff works is easy....why it works is another story. This dang truck is making me learn a lot of stuff I never knew I wanted to know.