Boost elbow + stock turbo = I'm a believer

[CLAYTON]

What a difference the boost elbow made on my truck with my stock turbo. Without the boost elbow I would tow on level 2 or 3 up Parleys canyon (in Utah) and hit the EGT back down set at 1350 pretty quick. Boost would stay right around 24-25psi at about 3/4 throttle. It would go higher if I stepped on it but so would the EGT's. I put the boost elbow on the truck to see if it would make it worse or better. Come to find out it helped quite a bit. At 3/4 throttle with the boost elbow the turbo would make around 31-33psi and I never hit 1350*. Highest I saw was 1300 and the speed that I was able to go over the summit increased by 15mph (from 55 to 70mph) do to the EGTs being lower and being able to give it more power. I could have gone faster if there wasn't traffic blocking me. I towed on level 4 the whole time and had plenty of power without getting to hot. Engine temp did get a little warm however. I wasn't a believer in the boost elbow before but I am now. Towing conditions were a 10k 5th wheel and 98* temps out side. Altitude was 4500-7120ft. Driving conditions were similar without the boost elbow that I used for comparison.

 

[JCleary]

Wow. I wonder what your intake air charge temps were? 7-9psi above what the compressor was designed for. I guess now you could add a Banks intercooler to bring the temps down

 

[CLAYTON]

I just need a new bigger turbo. I thought the stock turbo's are good up to 35psi or so before they turn into a heater?

 

[JHardwick]

You changed the box setting and added the boost elbow at the same time ... ... ..... which one reduced temps?

 

[CLAYTON]

On level 4 before it would hit 1350+ really fast. Now on level 4 the EGT went up a lot slower. Not saying that it wouldn't hit 1350+ sooner or later but during this testing it didn't.

 

[Nate]

What is this boost elbow your referring to?

 

[CLAYTON]

What is this boost elbow your referring to?

It's the Edge boost elbow that comes with the EZ or Juice/attitude

 

[JCleary]

I just need a new bigger turbo. I thought the stock turbo's are good up to 35psi or so before they turn into a heater?

According to the latest issue, the '03 and '04 trucks are good to about 24psi. Then the heat goes through the roof.



Every truck is different, though. If it's working for you, run it!

 

[BRayls]

According to the latest issue, the '03 and '04 trucks are good to about 24psi. Then the heat goes through the roof.



Every truck is different, though. If it's working for you, run it!

it does heat the air charge (not egt)up faster above 24 psi, truck does not matter. it is however flowing the extra air needed for his egt reduction. now if it had a better charger for the 30+ psi range is would be even lower as the charger would not be so inefficient.

 

[RMarkey]

It's the Edge boost elbow that comes with the EZ or Juice/attitude

I got the juice/attitude, but boost elbow? Did I get ripped off or am I just an idiot and didn't dig through my little box of happiness enough?

 

[RankRam]

I got the juice/attitude, but boost elbow? Did I get ripped off or am I just an idiot and didn't dig through my little box of happiness enough?

CLAYTON'S truck is a 555 and the elbow is mechanically actuated.



Your truck is a 600 and the wastegate is electronically actuated. In short the 600's don't get a boost elbow.

 

[RMarkey]

ahh, gotcha. I new that part, just didn't make the connection, too tired.

 

[JHMiller]

An Edge elbow??

Clayton, my local Edge Rep talked to them today while I was in the shop and Edge indicated they we not in the elbow business nor offered one?? Wonder what's up with the elbow you have?

 

[JHardwick]

it does heat the air charge (not egt)up faster above 24 psi, truck does not matter. it is however flowing the extra air needed for his egt reduction. now if it had a better charger for the 30+ psi range is would be even lower as the charger would not be so inefficient.

I don't buy that. More boost pressure does not equal more air volume.

 

[DKizerian]

Clayton, my local Edge Rep talked to them today while I was in the shop and Edge indicated they we not in the elbow business nor offered one?? Wonder what's up with the elbow you have?

The Edge I bought for my '03 555 came with a boost elbow. I decided I'd wait on installing it, then promptly lost it... .



Oops. .

 

[Hohn]

I don't buy that. More boost pressure does not equal more air volume.

True statement, but they often correlate until the turbo is WAY off its map.



Take my stock HX35, for example. In stock form it peaks at 21psi, where it is VERY efficient.



The engine's computer, though, will allow up to 26psi before it steps in and defuels. The turbo's still pretty efficient at 26psi.



Now, what if I run this turbo up to 37psi? Efficient? No way!



There is a certain point where each added pound of boost causes a loss in efficiency that more than offsets that additional pressure.



So does 31-32 psi get more air mass into my engine than 26psi? YES-- EGTS ARE MUCH LOWER. But once you get past about 35psi, each additional pound of boost is actually a step in the wrong direction, giving you LESS oxygen available, even if boost is higher.



So, more boost pressure does not EQUAL more volume, but higher boost WILL bring more O2 into the engine up until the turbo's compressor reaches the point of diminishing returns.



Another example-- a B1 is often run up to 52-55psi on the top end. Yet dyno tests have shown that it actually makes the most hp and lowest EGT at 45psi of boost!



jlh

 

[BRayls]

just as hohn says. the molecules of oxygen are greater at more psi, but when you get so far out of the turbos effiecient range of design the air gets heated to much causing the air molecules to expand giving you less of them. if your not getting more air in how can you lower egt without dropping the fuel?

 

[joe308]

Anyone running the boost elbow on a 305 with the EZ? Thought I read in the last issue of TDR that the stock turbo is near it's limits before fueling and recommended skipping the elbow.

 

[TCDiesel]

True statement, but they often correlate until the turbo is WAY off its map.



Take my stock HX35, for example. In stock form it peaks at 21psi, where it is VERY efficient.



The engine's computer, though, will allow up to 26psi before it steps in and defuels. The turbo's still pretty efficient at 26psi.



Now, what if I run this turbo up to 37psi? Efficient? No way!



There is a certain point where each added pound of boost causes a loss in efficiency that more than offsets that additional pressure.



So does 31-32 psi get more air mass into my engine than 26psi? YES-- EGTS ARE MUCH LOWER. But once you get past about 35psi, each additional pound of boost is actually a step in the wrong direction, giving you LESS oxygen available, even if boost is higher.



So, more boost pressure does not EQUAL more volume, but higher boost WILL bring more O2 into the engine up until the turbo's compressor reaches the point of diminishing returns.



Another example-- a B1 is often run up to 52-55psi on the top end. Yet dyno tests have shown that it actually makes the most hp and lowest EGT at 45psi of boost!



jlh

This is exactly correct, for every action their is a reaction. If you add the Banks Techni-cooler with stock charger EGTs will drop,But No additional Hp will result. The cooler is so big the stock charger suffers just to fill and pressurize it. I am now checking into a new charger. I was waiting on the VGT from Banks. The 66 is the one I may Try. I don"t care for Twins it Makes every Day driving a PITB.