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Long, slow build of my truck

FellowTraveler said:
Am I correct, the above link evidences that a 3 BAR boost sensor will lean out the fuel mixture of 2 bar tunes, or?
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Yes un-necessary timing advance and de-fuel can happen due to the 3 Bar. Depends on the tune though for the lower RPM de-fuel. In stock tunes, the de-fuel part should only be seen on L56 (EGR) trucks since they utilized that table.

I'm using MAP referenced fueling on my 12cm housing...let alone bigger turbos. Would be curious to have Hugh scan data and see if he is seeing around 5* additional cam timing at low MAP pressure on the 3 BAR.
 
Update.. have put roughly 3k miles on the HX40 now, and have really gotten to know the turbo. In short: I love it. I am seeing an easy 0-13psi around town not hammering on it, 3-5psi on the highway, and 22psi on a shift if I hammer on it. EGT's stay in check, have to really work it to get over 1100*. Whistle makes me smile every time, cleans up quick, boost comes on quick. Has to downshift to spool on a hill, but that's to be expected. I would be interested to try a bigger turbine/smaller housing like Morgan's new setup, but I am very happy with the 60/60/16.
 
Not really I guess what I would consider a true HX40. I would compare your turbo more to the HX35/40 hyrbid area. You are still using an HX35 turbine wheel with a 60mm inducer from a 40. So really you have like a 35/40 hybrid with a 16cm housing. But with the 16cm housing, you really have accomplished roughly what I did as far as reducing drive pressures and increasing performance. So as long as you are happy with it man, upgrading from that may not net you much except slightly faster spooling ability. I needed that with my 5 speed and 4.10 gearing
 
You are seeing the same thing I'm now wondering. The 7 blade hx40 wheel would help but this setup is no slouch. I have a 6 blade HX40W on now with the tune tweaked to match.

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6.5L said:
Not really I guess what I would consider a true HX40. I would compare your turbo more to the HX35/40 hyrbid area. You are still using an HX35 turbine wheel with a 60mm inducer from a 40. So really you have like a 35/40 hybrid with a 16cm housing. But with the 16cm housing, you really have accomplished roughly what I did as far as reducing drive pressures and increasing performance. So as long as you are happy with it man, upgrading from that may not net you much except slightly faster spooling ability. I needed that with my 5 speed and 4.10 gearing
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I just refer to it as an HX40, it's kinda a weird unit... Non-gated 16cm housing makes me think it's part H1C. It works good for my setup, wouldn't be too good with a stick though.


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Haha same with me. I have the fittings. Am just too lazy to hook up my wastegate to my compressor housing haha like god forbid I go buy 12 inches of hose. I did peg 27psi out on my gauge with mine on the other day though.
 
6.5L said:
Haha same with me. I have the fittings. Am just too lazy to hook up my wastegate to my compressor housing haha like god forbid I go buy 12 inches of hose. I did peg 27psi out on my gauge with mine on the other day though.
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I had my boost controller inline with mine. Eventually I had the boost controller set to allow full boost all the time, so when I repurposed my boost controller to control the Puff Limiter I decided there was no point in hooking anything back up.
 
I get what it does, but reducing black smoke also means reducing fuel charge. I know we are all trying to get away from excessive smoke but wouldn't the bit of extra heat help spool the turbocharger and increase your low rpm torque band. I guess to me a properly sized turbo would negate having a puff limiter. Even with the 60/64/14 I just swapped to, if I hammer the throttle she makes a slight puff then the turbo lights and she is gone, and that's with a manual transmission.
 
Yes, I realize that. It doesn't change what I said. A properly sized turbo can negate the puff limiter and create a broader torque band if you calibrate dynamic timing correctly.
 
6.5L said:
Why a puff limiter?
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ak diesel driver said:
trying to reduce the black smoke until boost builds
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6.5L said:
I get what it does, but reducing black smoke also means reducing fuel charge. I know we are all trying to get away from excessive smoke but wouldn't the bit of extra heat help spool the turbocharger and increase your low rpm torque band. I guess to me a properly sized turbo would negate having a puff limiter. Even with the 60/64/14 I just swapped to, if I hammer the throttle she makes a slight puff then the turbo lights and she is gone, and that's with a manual transmission.
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ak diesel driver said:
You do realize his IP can put put 160cc. IIRC it also adjustable.
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All true statements. The puff limiter is adjustable but for a pump my size it isn't the magic bullet I hoped it to be. With how I have the electronic boost controller hooked up to it I can definitely adjust how the turbo spools....I can clamp it right down so it won't spool, but I can't find a setting where it will spool nice and not smoke excessively. It's worst on hot days, but on cool days the smoke is pretty managable. Even so I do a lot of rear view mirror driving to make sure I'm not smoking excessively until spooled. I feel like a vvt turbo like an HE351 would help since the turbo would be better sized at low boost levels and move more air theough the engine....but that's just a theory for now.
 
6.5L said:
Yes, I realize that. It doesn't change what I said. A properly sized turbo can negate the puff limiter and create a broader torque band if you calibrate dynamic timing correctly.
Click to expand...
That's true but my pump makes 165cc @ 1500 rpm. I think I'd have a hard time sizing a turbo to handle that much fuel at that rpm and still give me good flow at 3500 rpm, too. My hope is that a vvt turbo can do that though....or at least get closer.
 
n8in8or said:
All true statements. The puff limiter is adjustable but for a pump my size it isn't the magic bullet I hoped it to be. With how I have the electronic boost controller hooked up to it I can definitely adjust how the turbo spools....I can clamp it right down so it won't spool, but I can't find a setting where it will spool nice and not smoke excessively. It's worst on hot days, but on cool days the smoke is pretty managable. Even so I do a lot of rear view mirror driving to make sure I'm not smoking excessively until spooled. I feel like a vvt turbo like an HE351 would help since the turbo would be better sized at low boost levels and move more air theough the engine....but that's just a theory for now.
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There are only two (2) ways to burn all that fuel on the down low "a Detroit Diesel Blower or compounding turbocharging both of which will produce massive torque right from idle." There would be no need to run high boost either!

If you look at the cid, cfm to rpm tables I had posted the Detroit blower is sized by cid + 400 cid for the diesel "end result bigger air from idle" I suspect the smallest for that diesel would be a 4-71.

http://www.wallaceracing.com/Basic Blower Measurements.htm
 
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