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Old 05-21-2011, 11:45 AM   #1 (permalink)
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Been Searching Forums for hours

OK, been searching the forums for hours. I know I saw a post that answered my question but I cant locate it anywhere.

Just installed Diamond Eye 4" Exhaust on stock truck. Now truck seems to be rich/fat smelling. I know there are adjustments to make but I cant locate which, and why it needs to be adjusted. Im guessing its due to low egts with the larger exhaust???

Also, Ive been online reading and reading. I know gas motors. Where can I learn how this 12v works before I start making adjustments to gain MPG. For me I need to understand the hows and whys before I start tweaking the pump or adjusting the timing. I like to know how one effects the other and why Im getting this or that result.

Our biggest goal with the trucks are MPG (with plows or towing appx. 2k)

Thanks in advance!
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Old 05-21-2011, 12:02 PM   #2 (permalink)
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Turning up the pre 94 Ram diesel injector pump


This should help if you want to know what each adjustment does.
Do you have gauges? If its "rich", its smoking. If not, it just smells like a diesel. Worn injectors may cause it to haze. That might make the exhaust smell a little stronger, but I don't know. The 4" exhaust won't cause any problems, any problems you are having would have been there before the install.
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Old 05-22-2011, 11:32 AM   #3 (permalink)
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if you are looking for mpg 1st things first it has to breathe. the exhaust is a great start and a cold air intake should be next then gauges pyro especially, then pump and timing mods. dnr has a really nice cold air kit if you dont want to make your own. my 91ctd 2wd gets 20 towing a HEAVY trailor 26mpg empty in town and 28hwy.
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Old 05-22-2011, 12:24 PM   #4 (permalink)
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After I first installed my DE 4", my truck fell flat on its face. Nasty haze all the time and a whole lot of smoke with not as much power. After checking for problems, I tried every adjustment there was plus a few modifications. Finally, I had to go to a bigger (higher volume) turbo to clean it up and get the power back. Best I could figure out over a year of analyzing this is that I lowered my EGT so much it could no longer drive my H1C properly. Totally not normal, but that has been my truck from day 1.
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Old 05-22-2011, 02:59 PM   #5 (permalink)
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Quote:
Originally Posted by Left out in the cold View Post
After I first installed my DE 4", my truck fell flat on its face. Nasty haze all the time and a whole lot of smoke with not as much power. After checking for problems, I tried every adjustment there was plus a few modifications. Finally, I had to go to a bigger (higher volume) turbo to clean it up and get the power back. Best I could figure out over a year of analyzing this is that I lowered my EGT so much it could no longer drive my H1C properly. Totally not normal, but that has been my truck from day 1.

I thought that was because the previous owner had your timing advanced a tooth.
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Old 05-22-2011, 03:07 PM   #6 (permalink)
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I thought that was because the previous owner had your timing advanced a tooth.
That was part of the things I tried, re-setting the timing.
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Old 05-22-2011, 03:53 PM   #7 (permalink)
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i find it hard to believe a bigger exaust hurt your spooling???? doesnt sound right to me!!
my h1c loved the 4" pipes!! weird!!
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Old 05-22-2011, 04:23 PM   #8 (permalink)
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my h1c loved the bigger pipe.... but I still wanted more, and my hx35 and intercooler helped a ton.
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Old 05-22-2011, 04:43 PM   #9 (permalink)
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less backpressure can hurt spooling in some cases due to the fact of your exhaust leaving the housing in a less dense form, hence spooling less.
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Old 05-22-2011, 04:54 PM   #10 (permalink)
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less backpressure can hurt spooling in some cases due to the fact of your exhaust leaving the housing in a less dense form, hence spooling less.
that makes no sence to me as the size of the outlet on the housing didnt change?
anything turbine wheel and back shouldnt effect spooling negatively
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Old 05-22-2011, 05:02 PM   #11 (permalink)
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think of it this way, run your turbo without your downpipe (assuming it woudln't catch your firewall on fire) and tell me how much low end grunt you have. your exhaust still adds backpressure even though you have a 3" outlet to your turbo housing. Just like running 4" exhaust cools your egts down even though it is after your 3" exhaust outlet due to it decreasing your overall backpressure. I know many many guys that run 5" and larger exhaust (I was one of them I ran dual) and you lose low end torque due to backpressure, and you need more fuel to thicken up the exhaust to spool the turbo.

These are xtreme cases however and adding 4" exhaust to a stock truck shouldn't in my opinion actually hinder performance, I was simply stating the fact that it is possible.
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Old 05-22-2011, 05:28 PM   #12 (permalink)
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i still dont get how back pressure would help your turbo spool??? and i have ran my truck without the dp and no loss at all???? louder that hell though! haha
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