Clamp....Didn't like it.
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Logistics Pro
Joined: Jul 2001
Posts: 4,137
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From: Marble Falls, Texas
Clamp....Didn't like it.
I installed the clamp on my truck in place of the 10k mod. When I got on the road to test it, it fell on it's face. It felt like it was surging and it was shutting the fuel off. I didn't get any warning lights or anything. I installed it just like it said on the Diesel Stop web site. Anyway went back to my 10k
Rubberduck
Rubberduck
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Joined: Jul 2004
Posts: 106
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From: MN
Clamped 2 trucks with a switch, I like it!
Something doesn't sound right. I installed the clamp with a switch to the dash. Works great. Installed the same on buddies 99 & it's better than the 10k mod we took off. The new updated Clamp Mod is what you installed right?
Fleet Owner
Joined: Jun 2004
Posts: 25,090
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From: Rio Rico, AZ.
Originally Posted by RubberDuck
I installed the clamp on my truck in place of the 10k mod. When I got on the road to test it, it fell on it's face. It felt like it was surging and it was shutting the fuel off. I didn't get any warning lights or anything. I installed it just like it said on the Diesel Stop web site. Anyway went back to my 10k
Rubberduck
Rubberduck
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Logistics Pro
Joined: Jul 2001
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From: Marble Falls, Texas
Yeah, it was the updated version. Kwik, it wasn't overboost, it was right off the bat. I didn't even have time to build boost. Guys, I'm not saying I didn't do something wrong, it's entirely possible. But in the drive way, I would hold the throttle at 1000 rpm and pull the switch and immediatly it would jump to 1500. So it seemed to be working. But it just wansn't happy under load. I just want to see a working picture up close. Maybe I got something backwards. By the way I'm doing this on my 96 dually.
RubberDuck
RubberDuck
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Joined: Aug 2002
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From: Lake Stevens, WA
RD- just a thought, I know the pre 99 year PSD's have a slightly more efficient injector(single shot), and a lower volume HPOP. Could it be that the HPOP simply can not support the increased demands of the clamp over the 10K? You could try replacing the 1k ohm resistor in the clamp with a POT, and then adjust to where you have the best results 
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From: northern Maine
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Senior User
Joined: Jul 2004
Posts: 106
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From: MN
The Clamp is:
Poor man's chip / electronic performance upgrade. 10 k Mod increases HP, The lower the resistor the more side effects / rough idle etc. Some people have installed a switch on the 10k mod & used 5.6K, 1K, 440 ohm & 220 ohm resistors. The lower the resistor, the more HP and side effects.
The Clamp uses diodes to shut off the circuit at idle. As you press down on the Go pedal, the diodes get overwhelmed & the circuit is turned on, using the 1k resistor. Works well. The clamp originally used a 440 ohm, but that sent voltage spikes to the ICP sensor which may not have been healthy, now you install a 5.6K resistor inline to the ICP sensor (to protect against spikes) an connect a 1k with diodes for a nice power upgrade.
10K mod can be used with no pyrometer guage to measure Exhaust temps, The Clamp Mod should not be installed without guages. The Clamp can introduce high temps without pulling a load.
If you have $$$ to burn, just buy & programmer or a chip.
Hope this helps, Dennis
The Clamp uses diodes to shut off the circuit at idle. As you press down on the Go pedal, the diodes get overwhelmed & the circuit is turned on, using the 1k resistor. Works well. The clamp originally used a 440 ohm, but that sent voltage spikes to the ICP sensor which may not have been healthy, now you install a 5.6K resistor inline to the ICP sensor (to protect against spikes) an connect a 1k with diodes for a nice power upgrade.
10K mod can be used with no pyrometer guage to measure Exhaust temps, The Clamp Mod should not be installed without guages. The Clamp can introduce high temps without pulling a load.
If you have $$$ to burn, just buy & programmer or a chip.
Hope this helps, Dennis
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Thread Starter
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Logistics Pro
Joined: Jul 2001
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Likes: 41
From: Marble Falls, Texas
So should I have soldiered the 1k and diodes to the plug side of the 5.6k or the wire side. At any rate I have a switch for it. What are the side effects of a lower value resistor than the 10k. rougher idle, I can eliminate that with my switch on the shifter. What are the other dangers.
RubberDuck
RubberDuck
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Joined: May 2004
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From: Forest Hill, MD
Duck, I just did mine this past weekend too. I soldered the 1K diode stack to the PCM or wire side of the 5.6K. It definetly makes more power. I keep getting a random SES light though. It only stays on for about 5 seconds then goes back off.
Senior User
Joined: Jul 2004
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From: MN
Originally Posted by RubberDuck
So should I have soldiered the 1k and diodes to the plug side of the 5.6k or the wire side. At any rate I have a switch for it. What are the side effects of a lower value resistor than the 10k. rougher idle, I can eliminate that with my switch on the shifter. What are the other dangers.
RubberDuck
RubberDuck
Dennis
Senior User
Joined: Jan 2004
Posts: 256
Likes: 7
From: Colorado
Did mine a few weeks ago. Worked great-more power, better mileage- for a few days. Then went back to normal. Checked my switch-ok. Check for good ground-ok. Checked diodes and resistors (I am an electronics tech ) ok. Re-did whole thing anyway. Still no difference. If I unplug the icp, I notice a difference in idle, so I assume the pcm is still sensing. Any thoughts??? 