OK so i need some help understanding the waist gate function. On my truck in my sig i have been running a Smarty S-03 for about 2 years and I have had the waist gate both hooked up and un-hooked with a 1/8 plug in the hole on the turbo. Egt's are much lower with the waist gate disconnected. I thought lower EGT's is better?
I guess my Question is what is the harm of disconnecting the waist gate?

Edited January 17, 201411 yr by mulcher812

If I am not mistaken, the wastegate is there to prevent over boosting. It only lets the turbo build a certain amount of boost before it starts bleeding some pressure off. I am not sure though as to weather it will do any harm disconnecting it or not. Gotta ask bigger brains than me.

With only the smarty you aren't really risking over-spooling the turbo, but it is never a good idea to leave the wastegate unhooked. I suggest putting a boost elbow on it and setting the pressure to around 30psi. Just my  . Here is a link  http://www.vulcanperformance.com/SearchResults.asp?Search=boost+elbow&Search.x=0&Search.y=0

OK so i need some help understanding the waist gate function. On my truck in my sig i have been running a Smarty S-03 for about 2 years and I have had the waist gate both hooked up and un-hooked with a 1/8 plug in the hole on the turbo. Egt's are much lower with the waist gate disconnected. I thought lower EGT's is better?

I guess my Question is what is the harm of disconnecting the waist gate?

 

No harm, unless you overboost.

 

How much boost did you see with the waste gate disconnected?

With the waist gate disconnected and smarty set at level 7 I only saw about 32 max psi. and only for a short period it never held there. I have a boost elbo that came with my edge comp and with it installed the boost was about the same 30-32 psi but egt's were 1300-1500 wot.

Edited January 17, 201411 yr by mulcher812

Just out of curiosity what were the egts at with it disconnected?

32 PSI is not a problem, but it is near the top of the compressor map to where all it really does is heat the air and over speed the turbo. Just keep in mind when you are running 32 PSI your turbo is spinning upwards of 160,000 RPM. At that speed if anything were to happen to it....well I know of one guy who said he did overspeed one and he needed a hood, inner fender, tire, and fender besides the turbo.

Just out of curiosity what were the egts at with it disconnected?

EGT's never got over 1100.

So how much boost can an hx35 put out with out coming apart?

EGT's never got over 1100.

So how much boost can an hx35 put out with out coming apart?

Generally figure 35PSI is tops. I have seen 44PSI out of one though...........oops.

35 is the max. Sure, it might hold together pushing 50 PSI, but all you're doing is blowing hot air, and it ain't easy on the turbo.

So with the Wastegate disconnected and plugged off you saw 32PSI Boost and 1100 EGT, but with Boost elbow hooked up you seen 32PSI and 1300-1500 EGTs?

Edited January 18, 201411 yr by kedlin88

So with the Wastegate disconnected and plugged off you saw 32PSI Boost and 1100 EGT, but with Boost elbow hooked up you seen 32PSI and 1300-1500 EGTs?

With it plugged off was a max of 32ish 1100 EGT's but with the elbow in I only saw 28-30 and 1300-1500 EGT's. Today I made some adjustments and was able to see 40psi and 1300 EGT's... Bad idea...

With it plugged off was a max of 32ish 1100 EGT's but with the elbow in I only saw 28-30 and 1300-1500 EGT's. Today I made some adjustments and was able to see 40psi and 1300 EGT's... Bad idea...

By adjustments I'm guessing you mean to your edge comp and smarty? When I had both on my truck with the max I saw was 38 psi. And egts were at 1400 and climbing. What settings were you on for each? Was that with or without the boost elbow?

Yes I stacked them and no boost elbow. Smarty is set to level 5 and edge on 3x5. I wasn't sure how it would work. The EGT's were at 1300 when I pulled my foot out of it. They would have probably kept climbing if I stayed in it longer.

Edited January 18, 201411 yr by mulcher812

Not good!!   If you are going to stack the programmers you need to run the smarty on only even numbered settings. Those are the settings that only do fuel (No timing added). The edge will do the timing if you have it on there. Running the smarty on odd numbered settings with the edge on doubles the timing!!! Without the edge run any number. With them stacked only run 2,4,6,or 8!

So I reset the smarty to level 4 and edge to 3x3 and I can't get past half throttle with out going over 35psi. Not sure about EGT's as I half to let off it.

My recommendation is to put an adjustable elbow on it and set it to max at 35 psi. Also, turn the programmers down to keep the egts manageable.  With the amount of fuel pouring in that engine you need a bigger turbo to keep the egts lower. 

Sounds like its time for a turbo/exhaust manifold/4"exhaust upgrade...

Now if you had only the Edge Comp and the RV275 it would be very controlled but now stacking the Smarty now you out stepped the even HX35W turbo. I've got +50 HP Injectors and Edge Comp and its a wicked combo as is.

I think I'm going to do some more testing and start over from ground zero with turbo set up normal operation and RV275 and get a bench mark of the boost and EGT's with out and additives.

Peak airflow on the HX35 occurs at 30 psi, it can run higher pressure at lower airflow. I would set the wastegate around 30.