Engine/Transmission (1998.5 - 2002) Proper boost level

[cochrandc748]

Hey guys with my edge ez hooked up and the wastegate for my turbo completely blocked off my truck will max out at 25lbs boost on a hard uphill pull. With the wastegate bypassed shouldnt I be building more boost than that or is that normal for my near stock setup. Just wanted to make sure that I dont have a boost leak anywhere. Pyro is pre turbo and it never sees 1100* no matter how i drive it. TIA



Dustin :-laf

 

[Supermod56]

That's about right for a EZ, the more fuel you pour in the motor, the more boost it will make, sounds strange, but that's the way it is.



Tom

 

[rweis]

Are there any tables about which turbo will / should produce what boost at their "efficiency band"?



Example:



KSB1B efficiency band is xx - xx # boost.



Those with that turbo would then know if they are producing less than that, then more fuel will get them into the particular turbo most efficient band.



Also those that have that turbo that should be producing xx - xx boost and are producing more than that know they are have too much fuel for that particular turbo (probably know that because of too high EGT's).



Maybe I have a wrong concept about turbo's running in a particular boost band.



Bob Weis

 

[R-N-R]

Seems low to me, 22 is stock right? An EZ with turnbuckle on an HY will produce 38psi, way off the efficiency map but still capable. I would not block it off, just try to cap it at 28-30psi for a stock turbo. Is your wastegate stuck pen by any chance? Do a search, I recently saw instructions on how to check for boost leaks by pressurizing the system.

 

[RJPotts]

25 lb sounds low to me too. My boost gauge will regularly hit the 35 psi mark and up to 40 sometimes with the EZ and the "boost elbow" that comes with it.

I would say check for leaks too, and don't block off the wastegate all together.

-R. J.

 

[Bob Wagner]

if you are getting 40lbs of boost with just an ez, I suggest that you check the calibration of your boost gauge

 

[mrtwister]

I believe for your '01 19-20 psi is where the wategate should open. My '02 with the EZ will hit 32 psi.

 

[tunod_68]

I regularlly hit 38lbs with my Edge set to 2x5.

 

[Holysmokes]

What would you say "stock" should read. By stock I mean just turbo and guages... no box.

 

[SpicyJam]

With the elbow on you should see right around 32psi maybe more but not much.

 

[Gary - K7GLD]

What would you say "stock" should read. By stock I mean just turbo and guages... no box.

About 22 PSI - with a Comp only, and the provided turbo elbow restriction, boost went to 32 PSI. I now have a 4 inch exhaust, BHAF and 1. 6 F1 injectors - will hafta wait 'til we next tow the 5th wheel to see what boost/EGT will now max out to...

 

[Holysmokes]

Thank you Gary. Im running about 18. I was just trying if thats pretty normal. I do have BHAF.

 

[DieselMinded]

http://www.dieselminded.otisnet.net/what_to_monitor_for.htm

 

[RDBuck]

Boos elbow

Where do you put the "boost elbow" on an 02 auto? My turbo has a very short metal tube for a boost hose. I have the Edge Comp box but have not hooked up the elbow as I don,t see how to do it.

 

[Rattlin_Ram]

Where do you put the "boost elbow" on an 02 auto? My turbo has a very short metal tube for a boost hose. I have the Edge Comp box but have not hooked up the elbow as I don,t see how to do it.

You don't use the boost elbo on the auto HY. Turbuckle, j-hook, or something else on the wastegate arm will work, or some use a . 22 shell in the hard line.



Mine with just the EZ pulls 28-29psi at altitude here 6500ft or so. Down in the midwest would easily hit 32psi.



I sold the EZ and now hit around 21 with no box, just the exhaust and intake. I haven't touched the wastegate. However I bought the truck used, and have no idea if anyone else messed with it.

 

[Allnew2Me]

My truck is stock with gauges and my boost hits the wall at 20 like it is hitting a peg in the gauge. no matter how much I give it that is all it gets. I tapped my intake manifold right in front of the MAP sensor if that makes any difference, I assume pressure is pressure.

 

[Hohn]

You guys, you have to clarify if your boost numbers are empty or towing.



The towing numbers can be 6-8 psi higher, in some cases more.



Otherwise, all the input is useless, because it's apples and oranges.



Justin

 

[Hohn]

The other thing is this-- all other things being equal, the less boost you have, the better.



The only time low boost is bad is if:

1) You are using it as a diagnostic to indicate boost leaks

2) You are not getting the fuel to the engine, so the turbine gets insufficient energy

3) Lack of boost is causing high EGTs

jlh

 

[Beast2B]

and remember that you need TWO THINGS besides more fuel to increase boost:



1) mechanical means of holding the wastegate closed, and



2) electronic means of fooling the ECM/PCM so that it will not defuel to stay under ~20psi.

 

[rweis]

When I bought my KSB1-B I had discussed with the seller the need of a wastegate. We decided I would not need one and the wastegate would be closed before shipping. I "assumed" (notice quotes) it was. Seemed to be mechanically locked. Yes LOCKED, but NOT! CLOSED.



After trying to figuer out why my setup could not develop the power it should (got to it a year later). I started into the problem solution with help from TDR.



Wastegate was locked in the PARTIALLY open position.



I made a mistake, you can learn from my error.



Bob Weis