High Speed Response - Dodge Cummins Diesel Forum
94-98 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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post #1 of 11 (permalink) Old 02-13-2019, 10:25 PM Thread Starter
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High Speed Response

1995 with 360K, runs perfect with auto trans. Added a 4" exhaust, no muffler, electric fuel booster pump and have increased the waste gate pressure but only slightly. I usually keep it under 70MPH. The other day I pushed it to 75 and the engine came alive and pulled me to 80. Exhaust sound changed a lot - way smoother and higher pitched. Backed off after short run, not understanding why the engine HP suddenly jumped. When I got it back, idled smoother than it ever has, exhaust was still good. I dont have any gauges to tell me turbo pressure or EGT. Should I be concerned?


Dan
1995 Ram 2500 CTD 370,000 Auto Bone stock except 4" exhaust
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post #2 of 11 (permalink) Old 02-14-2019, 01:02 AM
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Do you have an adjustable waste gate? I'm curious how you tuned this?

What about in lower gears...you don't experience this same thing in 2nd or 3rd? Not sure if this is possible, but I wonder if the increased fuel pressure from that higher RPM cleaned out a gunked up injector.

Any sort of tuning with these trucks, short of just an aftermarket exhaust and intake, a pyrometer is widely considered a must. I'd shell out for one - you really don't want your EGT's exceeding 1200*F for extended periods. You can get one for 50 bucks and they're pretty straightforward to install. While you're at it, might as well do turbo boost, and trans temp too if you tow.

This whole setup ran me just under $400 including the gauge pod. Isspro EV2
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'97 2500 Laramie 4x4, 60-lb Valve Springs, 4K GSK, PDD Stage 3 P-Pump, MBRP 5" Exhaust, PDD AFC Live, Built 47RE, Thuren 2" Coils, Bilstein 5100, Synergy track bar, RedHead Steering Gear
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post #3 of 11 (permalink) Old 02-14-2019, 06:23 AM
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Quote:
Originally Posted by dwbDiesel View Post
1995 with 360K, runs perfect with auto trans. Added a 4" exhaust, no muffler, electric fuel booster pump and have increased the waste gate pressure but only slightly. I usually keep it under 70MPH. The other day I pushed it to 75 and the engine came alive and pulled me to 80. Exhaust sound changed a lot - way smoother and higher pitched. Backed off after short run, not understanding why the engine HP suddenly jumped. When I got it back, idled smoother than it ever has, exhaust was still good. I dont have any gauges to tell me turbo pressure or EGT. Should I be concerned?

What is a electric fuel booster pump?

84 K5 Blazer 97 12v, 47re with E-TransControl, Dodge Dana 60 with free spin hubs, Dana 70, B&M Mega shifter

96 F350 SC dually zf5, 4x4, 92 Cummins, THD 5x12's, THD fuel pin, THD HVLP with adjustable fuel pressure mod, WM, h1c 60/60/12cm WG wired
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post #4 of 11 (permalink) Old 02-14-2019, 04:04 PM Thread Starter
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Carter 72gph.

How did I tune the waste gate? Turned the knob in the fuel controller a couple of notches. Still has stock turbo that seems very tight and was told that the bolts have been replaced with studs but have not pulled the valve covers to verify.

All I really know is, before the "jack rabbit run", pretty much a dog. Now, big dog growls. Put a little too much foot around a turn and rear end breaks loose. Actually can get pushed back in my seat once turbo spins up.

Dan
1995 Ram 2500 CTD 370,000 Auto Bone stock except 4" exhaust
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post #5 of 11 (permalink) Old 02-14-2019, 04:08 PM
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So you have a electric fuel pump and the stock LP?

Show me a picture of this controller that tunes the waste gate, i've never heard of such a thing.

84 K5 Blazer 97 12v, 47re with E-TransControl, Dodge Dana 60 with free spin hubs, Dana 70, B&M Mega shifter

96 F350 SC dually zf5, 4x4, 92 Cummins, THD 5x12's, THD fuel pin, THD HVLP with adjustable fuel pressure mod, WM, h1c 60/60/12cm WG wired
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post #6 of 11 (permalink) Old 02-14-2019, 04:38 PM Thread Starter
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Yes. Electric fuel pump to ensure the stock pump does not lose pressure. What controller are you talking about? I am talking about the AFC.

I guess since more people are concerned about telling me what I need to do (spend more $$$), must not have a problem. The dog growls, accelerates hard at 80MPH, spins oversized tires, starts at 20F without waiting for glow plugs. Must be good.

Dan
1995 Ram 2500 CTD 370,000 Auto Bone stock except 4" exhaust
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post #7 of 11 (permalink) Old 02-14-2019, 04:43 PM
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[QUOTE=dwbDiesel;28898043]Carter 72gph.

How did I tune the waste gate? Turned the knob in the fuel controller a couple of notches.


Read above at what you posted about tuning the waste gate.

You don't need a electric fuel pump on a 12v.

The same thing happened to me a couple years ago I made a 75 mile interstate trip running 70 and when I got home my truck idled faster also. I just figured it got cleaned out since I very seldom go on a long trip like that. The good thing it didn't run worse so I wouldn't worry.

Also Cummins is a real diesel it doesn't have glowplugs.
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84 K5 Blazer 97 12v, 47re with E-TransControl, Dodge Dana 60 with free spin hubs, Dana 70, B&M Mega shifter

96 F350 SC dually zf5, 4x4, 92 Cummins, THD 5x12's, THD fuel pin, THD HVLP with adjustable fuel pressure mod, WM, h1c 60/60/12cm WG wired
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post #8 of 11 (permalink) Old 02-14-2019, 05:02 PM
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"Real diesel?"

Is that a jab at indirect injection? I've got a direct-injected reefer unit motor that uses glow plugs.

'95 2500 ECLB 4x4, 334k and paused due to epic transformation in progress.
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post #9 of 11 (permalink) Old 02-14-2019, 05:10 PM
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You can check the head bolts outside of the valve covers to see if you've got studs.

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post #10 of 11 (permalink) Old 02-14-2019, 06:04 PM
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Why would a bone stock engine have studs? Why would you put a failure prone electric fuel pump in front of a reliable mechanical pump? What knob on the AFC increases the wastegate pressure, and where exactly on the AFC is this knob? A "bone stock" 160 HP (which put about 130 HP to the ground) engine is a growling dog? Glow plugs? LMAO
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post #11 of 11 (permalink) Old 02-16-2019, 01:58 PM
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Quote:
Originally Posted by dwbDiesel View Post
Yes. Electric fuel pump to ensure the stock pump does not lose pressure. What controller are you talking about? I am talking about the AFC.

I guess since more people are concerned about telling me what I need to do (spend more $$$), must not have a problem. The dog growls, accelerates hard at 80MPH, spins oversized tires, starts at 20F without waiting for glow plugs. Must be good.
It's nearly impossible to say why your engine runs better now than before.
Having gauges to tell what boost and egt was before and is now would have helped.
I'm not going to tell you to spend money, it's yours to spend or waist as you please.
But it's well noted that operating these engines above 1200 degrees egt for extended periods will cause damage to the engine and or turbo.
Also operating a HX35 above 35 psi boost will greatly shorten the life of the turbo.
It's your choice if you want to buy gauges or not, but I can assure you that on a non stock fueling 12v eventually you'll pay the price for not having them.
Also if your auto trans is still stock it's well documented in several threads on this and other forums about how little of a power increase these trans can handle in stock form.
A few dollars for a shift kit to increase line pressure could save you thousands in a trans rebuild.

FYI Ford and GM use glow plugs, Cummins engines have grid heaters in the intake. Using the correct jargon will stop some of the jabs your getting.

Please continue to post.
Lots of good info on this site and people willing to help but look at it this way.
Having gauges on a 12v is like hooking a scanner to todays new engines, if you don't hook a scanner to a new engine it's a guessing game has to what it's doing, without gauges on a 12v it's the same thing.

The photo below is of a 4bt Cummins but they use the same bolts
If the bolt in front of the valve cover and along the sides of the injectors look like the ones in the photo you truck still has stock head bolts.
Studs would have threads sticking up with a nut on them.

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Mine-04 F-450 SCFB 4X4 drw,5.9 12v 215 Ppump,ZF 6,KYclutch,KDP fixed,gauges,5x12's,15deg,3k GSK,60#,AFC Live, Super B single,Pusher intake,D celebrator brake,07 coil spring front conversion.
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