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Hi I'm new to the site but have learned so much and hoping you guys can help me out. I've been getting a dead pedal at 53-55lbs of boost, things I've done aside from power mods are auto to nv5600 and 2001 fuel filter with twist off cap. Power mods are on my profile. I've replaced apps, map sensor, made sure the quadzilla is good, have good fuel preassure, and great power till that specific boost. Any ideas would help. Thanks.

Edited by Pnwtree

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I can do that later on when I'm home for work, I had done that and had it sent to quad, they didn't see anything really unusual other than boost preassure did a full drop to 0 psi got half second, then back to 7. Which is weird cause if i go to 53lbs of boost and let off before dead pedal it always goes to 6-7 then sliwly drops not instant. I'll post the log later on today. I did notice that to be weird though.

 

Screenshot_20170516-063110.png

This is the breakdown quad sent me, I'll get the one I got later. Let me know if this helps

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53psi is about the max of the factory map sensor.

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Even with the boost fooler of the quad? I though boost cooler doesn't allow ecm to see past 20 so would that matter? If not what map sensor would be better?

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It is just the max range of the sensor. The quad is reading boost preboost fooler and displaying it. Point being it is likely actually making more boost. 

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Yea technically off the log in making 56-57 on my manual guage. Do they make a sensor that exceeds that then? I know a few people that have no problem seeing 60+psi with no dead pedal. Also don't get any codes other than soft codes for the old auto tranny I had in it.

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What do you mean by Dead pedal?   

 

Does the truck hit 53 psi then all power is lost?  or does power not increase once you hit 53 psi? 

 

 

Also,  Your profile says you have the adr3000 tune loaded but the data log you posted shows cnabus fueling so that would be the V2 base tune. 

 

What do you have flashed to the box and what vehicle profile do you have on your iquad?

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Power completely drops, fueling stops, let off and full power again. Yea the log was when I flashed to v2, then flashed back to adr3000 to find out if it was the v2 causing it. Right now adr3000, but does it on both. Vehicle profile is 1998.5-2000 for adr3000

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can you data log this happening?  

 

hold your foot to the floor even when it dead pedals.  IT would be helpful to go back to V2 so we can see fueling and timing.  

 

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Yea I can do that later today, I'll put the v2 back on and give it a try holding to the floor and post my data logs with v2 holding to the floor after dead pedal.

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thanks, 

 

That will tell us whats going on.  

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58 minutes ago, Pnwtree said:

Yea technically off the log in making 56-57 on my manual guage. Do they make a sensor that exceeds that then? I know a few people that have no problem seeing 60+psi with no dead pedal. Also don't get any codes other than soft codes for the old auto tranny I had in it.

 

If you have any PCM codes, it will affect performance as the PCM is fed data by the ecm so either get a manual PCM or create "foolers" like I did to remove them.

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What rpm is this happening at? The turbos you have will not let themselves to "high" rpm operation. And compounds are deceiving due to the torque they make. I've made 60+ on a single charger and it was weaker than 40psi from my compounds. What is your drive pressure? What is your interstage boost? Egts?

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Yea that was the plan, but manual pcm from donor truck wouldn't run, and I've had a few people tell me it should matter. Power is also great up until this point.

Happens around 2500 in 5th gear, 3k in 4th, also depends if I open or close my Watergate. Open since boost won't build as high I can hold it to higher rpm, but get higher egt(about 1350) closed 8 get maybe 1200 egts but can happen bellow 2500 rpm. What do you mean interstate boost? Drive preassure I'm not sure, need to get a guage for it, what do you mean interstage boost?

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Okay so big update, I found that when I this happens and my boost preassure plummets, I'm still blowing smoke out the tail pipe so I'm fueling, I don't think I'm fueling as much because egts never got out of control when boost drop but was still dumping fuel out tail pipe. Also makes a winding noise with a sort of sucking sound when happens.

Screenshot_20170516-202437.png

Screenshot_20170516-202430.png

Screenshot_20170516-202422.png

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Interstage. Pipe between the two turbos on the compressor side.

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On 5/17/2017 at 6:45 AM, jlbayes said:

Interstage. Pipe between the two turbos on the compressor side.

Sorry I dropped off, but if anyone is still chiming in I have a update. I went ahead and switched out my old twin kit thinking it must be why is was cutting out and it did. But for some reason with the new kit I cannot get over 56lbs of boost(last kit just dropped at that boost preassure). I can hold it at that but will not go any higher. I did a boost leak test and found a few small leaks, fixed them and problem is still there. Totally stumped on why it doesn't want to go past that. I'm running dap 7x.012 sac nozzles (claim 225hp). I'm guessing it actually is electronic or maybe something more internal? Idk

 

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8 hours ago, Pnwtree said:

Sorry I dropped off, but if anyone is still chiming in I have a update. I went ahead and switched out my old twin kit thinking it must be why is was cutting out and it did. But for some reason with the new kit I cannot get over 56lbs of boost(last kit just dropped at that boost preassure). I can hold it at that but will not go any higher. I did a boost leak test and found a few small leaks, fixed them and problem is still there. Totally stumped on why it doesn't want to go past that. I'm running dap 7x.012 sac nozzles (claim 225hp). I'm guessing it actually is electronic or maybe something more internal? Idk

 

 

You don't have a blow off valve or something silly like that?

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1 hour ago, kzimmer said:

 

You don't have a blow off valve or something silly like that?

Nope nothing like that, and made sure limiters are off on the quad.

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We still need to know drive pressure and interstage boost pressure. Manual gauge is following the map readout on the quad right?

Especially with a new setup involved.

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4 hours ago, jlbayes said:

We still need to know drive pressure and interstage boost pressure. Manual gauge is following the map readout on the quad right?

Especially with a new setup involved.

Yea I just ordered the stuff to do a drive preassure guage, so I'll let you know in a few days what thats looking like. I'm kinda convinced it's the dap nozzles cause the power difference between the ii 120s I had in it before aren't much and have more white smoke from 225s compared to the 120s which did more black. 1 is map read out, 2 are manual map read out says 55 manuals say 56. I'll do interstage when I get another guauge, my new setup is a s475 96 1.32 under a 62 68 12 sxe.

I also know the spray angle on the 225s are wider than the other people's injectors.

The other two guages I have read from intake horn(water meth) and guage pillar reads from intake.

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 Maybe cracked intercooler nwhen sertain psi is reached bam. Or could you be running out of flow in your air filter, take it off and try it.

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1 hour ago, Dieselfuture said:

 Maybe cracked intercooler nwhen sertain psi is reached bam. Or could you be running out of flow in your air filter, take it off and try it.

Yea I was possibly thinking a cracked intercooler, I'm going to do drive preassure test first since it's cheap and eliminate possibility of under fueling then look into that. Yea tried that on last twin kit, didn't change the one I have now is brand new.

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Well think I finally figured it out, knock on wood. Ended up pulling everything off the front to do a solid check on intercooler and sure as **** and sure enough right behind the condenser, there's 4 spots that it was throwing steady bubbles at maybe 15 psi so thinking that gatta be the reason. Will find out in a week ordered a new intercooler.

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