How much boost?

[snowracer69]

My roommate has an '03 that we just slapped an EZ onto today. Didn't put the boost elbow in, as he has no gauges... yet! Anyway, with the box on the highest, 70 HP setting, what kind of boost will he be getting if we do install the elbow?



I'm working on him... I'm sure he'll have gauges soon, but don't know how soon.



Josh

 

[KLockliear]

Mid 30's.



Put the gauges in before you do it though and go test for EGT's pulling. We found EGT's were worse with the elbow and more boost.

 

[JHardwick]

Kieth,



You are screwing me up here, LOL.



I can hit 40psi with the wastegate completely disabled and I think most are saying 36-38psi with elbow.



In my mind, more air equals lower EGT's.



Are you saying that this HY turbo slows down the exhaust so bad to get to 40psi that it out weighs the intake pressure that is produces??



I really can't say my EGT's are out of line and in some cases better then what I have been reading here.



Your gonna sell me a turbo yet aren't you.





From another thread ... ... ... . should I keep my pressure box since the knew one is rumored to be timing and pulse only??

 

[rbattelle]

Originally posted by JHardwick

From another thread ... ... ... . should I keep my pressure box since the knew one is rumored to be timing and pulse only??

My non-professional opinion: ditch the pressure box and get the timing/pulse box.

 

[DIESELMAN]

Originally posted by KLockliear

Mid 30's.



Put the gauges in before you do it though and go test for EGT's pulling. We found EGT's were worse with the elbow and more boost.

You mean towing?? I see the temps lower by 100 - 150 degrees with the extra 10 lbs of boost, same hills, same load, same speed.



As long as the RPMS's are over 2200 - 2400 it is always cooler with more boost. When I tow without the elbow, boost stops at 22PSI and I have to back off at a much lower speed due to high EGT, with the elbow, I can run faster before I reach the same peak EGT, at 36 PSI indicated.

 

[TBOB]

Boost and EGT

I run an EZ with 36 lbs towing and just found out that the stock exhaust manifold in restricted at 4 and 5 cylinder, could cause burnt piston. Changed to ATS exhaust manifold. First test drive shows turbo boost coming up faster. I will tow 1600 miles next week for final test.

Yes more air should lower EGT to a point. Tbob

 

[JHardwick]

Originally posted by rbattelle

My non-professional opinion: ditch the pressure box and get the timing/pulse box.

I was thinking of stacking, LOL.

 

[KLockliear]

JH, with the standard elbow that comes with an EZ, you won't see that much. Disabled, maybe so.



In our testing, the intake air temps went up enough to counteract the EGT benefit of the additional boost with the stock HY.



You will be able to stack the new box with your existing box from what I have been told. You will really need a turbo then.

 

[BigDaddyMC]

As I stated in another post, I disagree with Keith on the boost elbow. I have done some pretty good real world testing with the elbow and without while towing a heavy load (8 - 10K) up some pretty significant hills. We've also done some pretty good testing on the Dyno and our results are very significant. We saw about a 200* drop in egt's when we were into the throttle (real world not dyno).

I can't explain the differences between my results and Keith's. Those guys at DD are absolutely top dog. I just found that the boost elbow was a MUST!



We are talking about doubling the amount of boost going through the motor. From 17/18psi to about 35psi. HUGE difference in volume! I realize that when we start pushing that much air through the turbo, it quickly starts to be come inefficient. I believe Keith when he tells me that the turbo limits are somewhere in the mid 30's. I just KNOW first hand that the boost elbow was without a doubt a necessity. The only bad thing about the elbow was that you would have to replace it with the old elbow when taking it in or service - probably take about 5 minutes. That in and of it's self isn't hard, but there is no way to put the stock clamp back on once you cut it off.



I have posted my data on another post so I won't waste your time with it. If you want to know for sure, I believe that EDGE will send you an elbow for next to nothing or give Keith a call at DD. He was nice enough to give me a couple Free of Charge



Again, I'm not trying to discredit DD or Keith. Those guys are awsome! Keith is one smart dude. Just might be a case of real world vs. shop testing. Or it could even be, that they are so smart, and they know so much, they're missing something that my "simpleton" brain gets.

 

[KLockliear]

Hehe. Stock, an HO should make around 23-25psi. 17/18 is a bit low for an 03/04 (but right on the money for a stock 94-02). With the elbow and the power of an EZ/TTPM, the boost will jump to around 34-38psi.



While there is more air going in, the air is also hotter. As you compress the air, it gets heated, which means hotter intake air temps. This equates to hotter exhaust temps as well. The more boost those make, the more inefficient they are, and the more heat per # of boost is developed.

 

[RankRam]

The most boost I've seen is 24. 1. This on my stock 03 HO 48RE.

 

[zari]

Like I said in the other thread, I see a reduction in EGTs of around 150*F with the elbow vs. w/o the elbow; EZ (still) on level 6. Everything else is stock. My boost is right around 35PSI.

 

[snowracer69]

What are you guys seeing for EGT's w/o the boost elbow, empty.



He doesn't tow anything, and we have the box on setting 3 (60 HP) right now. Like I said, no gauges, but he loves the box already (he had a week to decide whether to keep it or not and he already told me 5 minutes after putting it on "so, what's the next step?" I said "about $5000 for a transmission and then you can do whatever you want!") Of course gauges will come before that, but still... .



We're at 5000 ft. here in Arizona, but where he's from in Texas is about 500 ft.



Thanks for all the info guys... won't put the elbow on until he has gauges.



Josh