Recently I experienced high boost pressures when I get on the pedal with my D-Max.

I have a Banks Six-Gun with Speed Loader set-up. I usually cruise around with the setting at 2, sometimes 3. The other day I felt the need for diesel speed and I turned it up to 4 and got on it. I did not get very far into it and my truck stalled for a moment, I let up on the pedal, and then it started right up and acted as if there was no problem. I decided to try the 3rd level to see what would happen. Same thing. I noticed both times the boost pressures went over 25psi. I thought it must be the Banks system cutting off the motor because the boost was too much. But this has never done it before, so I went to trouble shooting the problem.

I read through the manual and reset everything along with clearing any DCT's. Nothing. I call Banks technical support. I spoke with Jason who was patient and helpful. After 3 different calls to Banks, I received an RMA number and sent the unit in to banks.

During this wait time, I was running the truck stock, except for the exhaust, air intake, Banks large intercooler and waste gate. I decided I would get on it while running in this way. I noticed it did the same thing, but without the stall. Hi boost pressure and a de-fueling to the motor.

I just recently received my Banks Six-Gun back, re-installed it and the same thing is happening.

Someone tell me what the Censored is going on. :help:

Have you adjusted the banks big head waste gate? That is what your problem is, get it under 30 psi.

Yep, waste gate is what allows you to build boost. Problem with boost? start and finish there.

When was the last time you changed your fuel filter?

Check fuel filter , and check the Banks unit for codes also. It has a series of blinking lights trhat will blink and tell you if it went into safe mode.

THAT BEING SAID , ID BET YOU ARE GETTING THE FAMOUS 234 236 overboost codes from the factory that dont throw a check engine light. When this happens the truck will lay down from the code telling the ecm to defuel the engine. and then come back up to power. There are devices that can fool this . .

Pm me for questions

stevemax - I cleaned the filter as part of my trouble shooting this problem.

C.A.P. - The Banks tuner is newly replaced and I did check it for codes. No DTC's found. The fuel filter I have not changed, yet.

DURYMCGEE & neverenuf - I look at the Banks Big Head Waste Gate owner's manual at the installation part and the trouble shooting section. I did not find info on how to make an adjustment. I took an actual look at the waste gate under the hood and I still do not know how to make the adjustment. I don't mean to sound stupid, but how do I make the waste gate adjustment?

Thanks guys for your knowledge. I hope to resolve this issue with my D-MAX.

-STEVE-

bighead is adjusted by twisting the arm shorter , you did look for dtc 234 or 238 , I had the banks and both versions of it , did you change the FUEL filter ,VERRY IMPORTANT ! the spin on one on the side of the block (passenger side) it is famous for not making banks work. Then if that is not it check all pins on the two plugs of the Delphi connectors

Thanks C.A.P. I will look again for dtc 234 & 238 and change the fuel filter. Is there a particular brand of filter that is great among the D-MAX? What's the part number?

Now regards to the bighead. Adjustment is by twisting the arm shorter. How much? What am I after? 5 turns, 10 threads, 30 PSI, etc. Please tell. Also, why do I need to adjust the bighead when it has never been touched? Everything was working fine. Does it need adjustment from time-to-time?

Thank you for everyone’s input and future input. I just want the POWER back for my D-MAX. It's an addiction.

Thanks C.A.P. I will look again for dtc 234 & 238 and change the fuel filter. Is there a particular brand of filter that is great among the D-MAX? What's the part number?

Now regards to the bighead. Adjustment is by twisting the arm shorter. How much? What am I after? 5 turns, 10 threads, 30 PSI, etc. Please tell. Also, why do I need to adjust the bighead when it has never been touched? Everything was working fine. Does it need adjustment from time-to-time?

Thank you for everyone’s input and future input. I just want the POWER back for my D-MAX. It's an addiction.

i think its trial and error adjusting the wastegate. i think some use an air compressor to test it. you dont want 34 psi, that is the kaboom point on a stock turbo. 31 - 32psi is about what you want.

It is possible that the pressure in the combustion chamber is higher than the injection pressure when boost reaches 25psi or higher; thereby blowing fuel back into the injector.

It is possible that the pressure in the combustion chamber is higher than the injection pressure when boost reaches 25psi or higher; thereby blowing fuel back into the injector.

wouldnt think so, a lot of guys are running with the boost up past 25psi, some pushing 50 with an aftermarket turbo or twin turbos

I am wondering what the indication is of too much boost. Is the gauge reading high? Throwing overboost codes? Just curious.

Be sure to look for the overboost codes that CAP and others have mentioned, these are quite common. What are you using to check for DTC's?

Eric,

"Too much boost," is over 25 psi. I have a SPA Design gauge and it is set to light up the little red indicator for boost psi over 25. I have noticed the loss of power, sometimes a short 1-2 sec. shut down of the motor, happens every time boost psi readings go over 25. What's puzzling is this happened with and without the Banks system connected. It was just more pronounced when the Banks connected.

So far the Banks Six-Gun turner has been newly replaced and the air filter cleaned. No change.

My next step will be to change the fuel filter and adjust the waste gate as soon as I learn how.

My concern, besides loosing all that kick @$$ power, is it to make sure there is nothing else going on with the D-MAX (ex: injectors are bad, turbo is fried, ECM is screwed, etc.).

Thanks,

-STEVE-

there is really no set limit on boost if your programming is right. That being said , I still would check for dtc 234 238 with a good code reader. Your situation is weird. You still may be getting the fuel lay down with no codes thrown either .
1. did you only get this after the big head install ?
The factory ecm has a boost range and where it should be, when its compromised it will defuel to protect the engine. This is usually corrected by programing but the banks only intercepts the factory fueling tables and alters them. IT DOES NOT ALTER THE ECM AT ANY TIME , OR ITS PARAMETERS , IT CHANGES THEM AFTER IT SENDS THEM OUT.
IF THIS ONLY HAPPENED AFTER THE BANKS BIGHEAD WAS PUT ON ILL GARANTEE ITS A DEFUEL OVERBOOST ISSUE.
There are devices that can stop this as I said , they are designed to alter the factory boost sensor to think it is seeing less boost. You will not get the laydown . This was a common issue with some trucks. ppe makes a unit to do this , Pm me I have one laying around