Wastegate

[Ray J]

Guys, could someone please explain exactly what the wastegate does..... and with the HY, why it needs to be disabled when using a box and larger injectors? Thanks in advance..... looking to add to my diesel knowledge.

 

[Ray J]

Anyone??... ... ... ... ...

 

[nps]

The wastegate bleeds off boost above a preset level - about 20 psi on all motors except the ETH HO which is set to I think24 psi.



If the computer sees greater than 20psi it defuels the motor. (more fuel=more exhaust=more boost).



The purpose of putting on larger injectors is to deliver more fuel that in turn creates more boost. So to get the max benefit need to make sure 2 points are taken care of: 1) wastegate doesn't dump extra boost that will rob power and increase EGTs if you don't keep it from dumping, and 2) computer doesn't see more than 20 psi boost even if its there. Point 2 is taken care of by a boost module.



Point 1 is taken care of with the wastegate. The hx turbos have a rubber line going from the turbo to the waste gate. By changing the elbow, the boost level that causes the wastegate to open can be changed. The hy (supplied with autos) has a hardline thus no elbow option. A turnbuckle has been used to hold the wastegate closed.



Hope this helps.

 

[Ray J]

Thanks nps. Yes, it sure does help..... now I have a better understanding of what the wastegate actually is. I have the HY and plan eventually to do the Edge EZ and 275's. I guess it makes sense to keep the gate closed and not lose the boost.



One thing I'm still not quite sure of though: If the EZ is not letting the system see 20+, why would it open anyway? If its an automatic thing that the system opens it at 20, wouldn't it stay closed as long as the system doesn't know there is 20 or more?

 

[Sky]

The EZ will give you more than 20, thats why you have to have the hy disabled to get more boost. I have the combo you want and I can hit 20 in a second. I am currently working on my hy to get more boost.

 

[nps]

Ray J -



Goes back to the two points I talked about.



The EZ keeps the computer from seeing 20+ pounds of boost. The computer doesn't control the wastegate. The wastegate is mechanical and works independent of the computer. The computer is kind of a fail-safe backup if you will.



The wastegate opens mechanically at 20 psi and doesn't allow the boost to build higher. If it fails and boost goes above 20, then the computer defuels and sets a code in the ECM.



If you want max boost, got to take care of both issues.



If you are thinking of 275/EZ, might want to check out Diesel Dynamics. They have an August special for their stage 1 pro kit. Mention your TDR membership number and get 20% discount. The stage 1 pro is their repackaged EZ plus their DD1 injectors. DD1's are just a little above the 275's but better matched. Think Bosch standards are within 8%, DD standards are within 2%.

 

[Mactruck]

Stage 1 pro???



I don't see it listed. I see stage 1 or stage 2 not a stage 1 pro???

 

[nps]

Stage 1 pro is not in the catalog. Look on the home page under New products and specials - its the Dodge August Special.



If you look under the TTPM description you will see:



"The True Torque Power Module will add the same 50hp/100ft-lbs of torque to any level of injector. This means that Stage 1 injectors and a True Torque Module combine for 100hp/200ft-lbs of torque to the wheels! We call this a Stage 1 Pro kit. "



A little ambigious but seems to be it. I haven't called them to verify.

 

[Ray J]

Ahh... ... now I've got it! Guys, thank you very much for the info.

 

[boonsur]

I didn't see it mentioned:



The EZ comes with a different boost ELBOW with a modified hole through the middle. With the smaller hole, there isn't as much force (psi x area), so the wastegate doesn't blow-off (switch) as early, thus allowing more (psi) boost to the engine.



The MAP sensor tries to tell the ECM that it has over 20 psi, but the EZ intercepts the signal and sends the ECM a different reading (boost module part). Thus the computer never knows it was over-boosted (cannot store any codes, etc. )



This elbow needs to be installed between the turbo and the wastegate. If it is not, the box will add the fueling, but the engine will not get more air. This will cause a rise in the EGT's, and also not yield as much performance as it could.

 

[Ray J]

Originally posted by boonsur

I didn't see it mentioned:



This elbow needs to be installed between the turbo and the wastegate. If it is not, the box will add the fueling, but the engine will not get more air. This will cause a rise in the EGT's, and also not yield as much performance as it could.

Boonsur, I don't think that elbow that comes with the EZ can be used with the HY and an auto.

 

[boonsur]

Ahh, yea. I forgot about that (I have a '99). But I believe (a little more shaky) there is still a way to change the pressure when the wastegate opens. Not sure if the method is the "turnbuckle" setup, or the . 22 shell method. I'm out of my league here, hopefully a search will reveal more.



I still think you should increase your boost from stock. My first EZ box (later replaced) was not adding fueling (changing timing). I had quite a noticable performance gain, just by having the increased boost (I am really happy now that it is also adding the fueling!!!).

 

[MoparDave]

Boonsur how did you know that the EZ was not adding fuel or did you get the model that just does timing?

 

[Partyat33]

In my experience you need to shut down that wastegate to keep the EGT's under control. When my wastegate dumped at 20 it was really easy to shoot the temps beyond a good range. I put in the elbow, and with a higher boost there is no doubt the EGT's are better.



Dennis

 

[Ray J]

Originally posted by MoparDave

Boonsur how did you know that the EZ was not adding fuel or did you get the model that just does timing?

Grin, MoparDave, why do you want to mess up my mind this way? I thought the EZ for the 01's handled both fueling and timing?

 

[boonsur]

Mopar Dave,



I didn't know at first that the EZ box was bad, since the power was noticably improved, due solely to the higher boost. But I was a little dissapointed, because I expected higher things from it, based on other's testimonials.



After reading a few other posts on bad boxes, I decided to give Edge a call. They were extremely helpful in trouble shooting the problem. The best test is to run the truck with and without the connector plugged into the data port (leaving the MAP sensor connections in place). I didn't notice a change, so they ended up swapping my box for a new one, even though it had been months since I got my first one.



As soon as I fired-up the truck with the new box, I had black smoke, and I have lived happily-ever-after.



BTW, I probably mis-spoke, I think the EZ only changes the timing