Engine/Transmission (1998.5 - 2002) Lower boost after comp?

[TSRAM]

I recently replaced an EZ with a DD comp box and saw my boost drop a bit. With the EZ and DD3's I could hit 30psi and 1200deg pre-turbo. After the comp install I see between 27-29 psi and 1200-1250 deg. The ex. temp isn't too high I know, but I would have thought that after the larger box I'd at least see above 30psi. I have removed, cleaned all connections, greased, and replaced to no avail. I went out yest. afternoon and checked all clamps and hoses. Am I missing something else?

 

[jwilliams3]

Is your fuel aggression on level 5?

Do you have a stock turbo and if so, do you have the Edge "brass elbow" installed?



Can you feel a difference in the boxes?



--Justin

 

[TSRAM]

Yes i do have the boost fooler on. I left the one from the EZ on. And yes, I also can tell some diff. between the two boxes. Level 2x2 and 3x3 feel real close to the EZ while 4x4 and 5x5 feel a bit stonger. I did expect more of a SOP difference though. On level 5x5 the max boost has bee about 27-28 psi.

 

[Snow man]

Something isnt right,you should feel a huge SOP difference on the ETC engine,going from an EZ to a comp. . The tach should leap for 3000 after the comp is on,and on 5x5. Do you have a steady smoke trail on 5x5? You should have smoke constantly with a stock turbo and DD3's.

 

[TSRAM]

Not steady smoke, but definitely more than with the EZ. It'll leave a pretty dark cloud most of the way through 1st gear then just a slight haze as far as I can tell. I guess I need to go out and check the pump tap wire again for good measure. I have checked everything else that I know thoroughly.

 

[Sticks]

That pump wire alone is good for 70HP, at least on the ETH's. We had a Dyno Day a while back and that was the difference between mine with the EZ, and another ETH/DEE with the comp & Wire.



How is your fuel pressure? Your system may not be able to keep up with the fuel demands.

 

[TSRAM]

Fuel pressure hasn't dropped below 10-11 psi at wot. I get around 15-16 psi at idle. I can tell the pusher pump helps with the supply/demand fuel issues. I'm gonna go out today sometime and check the pump wire again. It was a SOB to get on. Maybe it didn't pierce good?

 

[WadePatton]

I don't smoke excessively with stock turbo and 3's and DDUFM. But I'm making 34-36 psi. That is once the boost comes up. I can get quite sooty before then. But then DDUFM's aren't supposed to be as sooty as the PE version.



With the boost elbow/DDUFM and stock injectors I was going over 40psi boost. I drilled the elbow AND adjusted the wastgate to get my boost #'s down.



The Comp should equal the EZ on level one only. For testing purposes I recommend setting all your sub-levels to the same #. Then it's easier to feel the changes.



You'll make more boost and power when the VP gets the extra signal. Watch that EGT guage- you should be hitting 1400-1500 easy.

 

[Snow man]

Ive donr a few trucks,ive get have one with an hx35 that could celan up a comp on 5x5 and dd3's. They smoke a steady trail of smoke WOT,its not pure soot,but it smokes steady. If he has literally no smoke wot on 5x5,i dont think he is getting all the fuel he should.

 

[Jetpilot]

Check ALL the electrical connections especially the wire tapping the VP-44. I would also put dielectric grease on all connections including the tapped wire. If after ensuring all connections are good you still have a problem I would contact DD as the box could be defective.



Doug

 

[TSRAM]

Went back out to the truck and re-crimped the snot out of the wire tap. I have already re-checked and greased the rest of the conn. to no avail. Will find out something in the morning on the way to work.

I can tell that it's got more get up and go. The main thing was the boost #'s. Either the extra smoke is due to the extra fuel or the lower boost #'s is what I trying to figure out.

 

[Jetpilot]

You might check the gaskets on the intake horn. Maybe you blew a piece out with the newly found power. With your box on level 5 and your foot on the floor your egt's should be much higher than 1250 pre-turbo. Something is not right, there is a huge power difference between an EZ and a Comp or UFM. You should see a lot more smoke, higher egt's, and more boost.



If you are on level 1 what is the boost and egt's? Level 1 is what and EZ is..... As you go to the higher levels you start increasing the fuel above the level you get with an EZ hence the increase in smoke, egt's, and boost.



Doug

 

[TSRAM]

Hasn't been to much diff as far as boost psi thus far. Only 2-3 psi diff between the levels1-5.

I'll take a look at the intake gaskets tomorrow if re-crimping the wire tape didn't do any good.

A question though, If the intake gaskets were leaking wouldn't the EGT's be a lot higher than they are if the extra air wasn't getting into the motor and was instead blowing out?

Yes I can tell some SOP diff between the levels, but no higher than around 1100 deg 1x1 and 1200-1250 5x5. A lot of diff as far as smoke between the two mind you. Almost none whatsoever on 1x1 and a pretty good stream halfway through 1st gear with only a slight amount of haze thereafter.

 

[Snow man]

you should hit 1500+EGTS in under 5 seconds WOT with a comp and dd3's,w stock turbo. i hit 38-39 psi with my stock turbo /dd3/s and comp. i hit 31-32psi on level 1.

 

[puffincoal]

w/ my dd 1's and the comp on 5x5 i can hit 49psi w/ the waste gate plugged off while pulling. running empty 40-45psi on a regular basis. do u have a good air filter? i noticed a big differance in spool up time with a good filter set up, just my 2 sence

 

[TSRAM]

Had no different results today with boost nor EGTs. level 1x5 at WOT I have 26psi and 1100-1200 deg. pre turbo. On level 5x5 I have 27-28psi and 1250. There is a noticeable difference in the amount of smoke though between the settings.

I did have a scare today. I had a intercooler hose pop loose on the feed side on the way to work this morning. I looked up and no boost!! I was already trying to think of a way to tell the wife a larger turbo was gonna be in order.

I am thinking of replacing the 1/8" rubber hose with a harder heat resistant plastic line to the boost gauge.

 

[mgoncalves]

As long as you have the correct wire tapped, then you probably have a bad box.





Matt

 

[Diesel Gunner]

If it blew the boost line off of the back of the gauge, just use a small ty-wrap to secure it to the barbed fitting on the back of the gauge. I can't guarantee that it will work at 30 or 40psi but it solved the problem for me.

 

[TSRAM]

I will go out and try to snap a pic of the wire tap to post just to get a second..... or third opinion.

 

[TSRAM]

I went out and re-did the pump tap wire connection using a new connector. I put a zip-tie around the connector to keep it from working loose. I also put on two new intake gaskets to eliminate that as a possibility.

Go to my readers rides to check the pump tap wire behind me if you would as I can't seem to shrink it enough for the forums yet.