New to forum, and to diesels- I have the Banks Stinger/SixGun/Speed Loader and brake installed on my 2003 D/A (K2500HD CC LB) - current mileage 22K. I am running 285/75-16 Michelin LTXs, and the truck has a 3.73 rear gear.


Max boost is 18-19 using Banks' recommended 5 turns on the Big Head. EGT is always reasonable. I talked to Banks - they said 24 psi is a good safe max boost.


I have a couple of issues:


1)I have not been happy with the throttle response of this truck since new. My friend's 7.3 Ford will burn the rear tires off - my Dmax doesn't start to pull until about 1800 rpm, by which time I can barely read his license plate. Banks said that GM knows it has a problem with potentiometer voltage, that it should be 3.6v at WOT with key on - I am measuring about 2.2v. Banks also said some guys are bending the throttle pedal to allow more travel, and therefore voltage. Looks to me that the thin section near the pedal is bendable, but the pedal is hitting the floor hear the firewall (limiting WOT position) where the pedal is pretty thick. Anyone got thoughts about this? Anyone know the factory voltage spec?





2) About 2K miles ago, I began experiencing an intermittent, momentary feeling which is hard to describe, but feels like the power is interrupted for a split second, almost like a stutter. It hasn't happened under spirited acceleration, but happens while cruising at almost constant throttle (at times under very light loads, such as approaching an overpass on the freeway) at both low and highway speeds. I took the thing to the dealer, no codes set, he upgraded the ECM and TCM settings, but it is still happening. It happened about a dozen times on my recent trip from Houston to Boerne (about 500 miles RT). Anyone have any ideas?





3) What is the max safe boost?





Thanks to all


JB


Edited by: JungleBoy

<DIV>I have always wondered about the throttle and not getting full voltage. Where did you measure the voltage at? There should be 3 wires, right? Green and two other colors. One is 5 volts I think full time, one ground and then the varied wire.</DIV>
<DIV> </DIV>
<DIV>Tom</DIV>
<DIV> </DIV>
<DIV>Edit, I just looked at my service manual for the 2003, manual 3, page 6-3036: There are 3 sensor wires and one feed wire at 5 volts. Sensor 1 at 0 pedal travel is below 1 volt going to above 2 volts at 100% travel, sensor wire 2 should decrease form above 4 volts to 3 volts at 100% travel, and sensor 3 should decrease from 3.8 volts to below 3.3 volts. Sounds like 2.2 volts is what its supposed to be.</DIV>Edited by: duramaxtom

the easiest way to check your pedal is to use a scan tool, tech2, predator, something like that and look at the APP value.. if it goes to 100% you're fine..

APP value is under What the Eng Data 1 or 2, or where?

i belive its under at least 2 of the 3.. accellerator pedal position.

3) What is the max safe boost?


I think most feel it is around 30psi, but some have gone a little higher without issues. I would adjust your wastegate actuator if I were you, because 18-19psi is the lowest I have ever heard of. I can get more from mine stock.

I would not adjust the wastegate untill you have verified the throttle is 100% open. Without full fuel you will never see high boost pressure.

Read this:





http://dieselplace.com/forum/forum_posts.asp?TID=8823&amp;KW=neverenuf

Tom


I measured the voltage at the blue wire. I will check all using the specs you gave - thanks.


DP,Amric, craneman - Thanks for the advice and input.





neverenuf


Thanks for the link and your experience. How does your truck respond from a standing start? Mind does not seem to do much until about 1800 rpm or so...


JB

neverenuf


Thanks for the link and your experience. How does your truck respond from a standing start? Mind does not seem to do much until about 1800 rpm or so...


JB








The new version of the Gun is much better than the original. It really picks up around 1800 though. That is unless you power brake up to about 1k RPM, then your spinning the wheels. Only tried that twice to see if it would do it.http://www.dieselplace.com/forum/smileys/Embarrased.gif I couldn't spin the wheels at all with the old Gun.Edited by: neverenuf

neverenuf


What is the vintage of your 6 Gun? I bought mine in Jan 04...

Jungleboy- I think that's too old for ver 2. Check the P/N sticker:


By PeterT, Banks Power Inc. Part number 62956 is the Six-Gun with the first calibration that we shipped. It is emissions compliant and is covered under CARB E.O. D-161-74. Part number 62967 is the “race” calibration and is not emissions compliant. Both products are Six-Guns. We only began shipping 62967 on June 30, so if you received your Six-Gun prior to that date, it is part number 62956 and is emissions compliant.

This needs to be moved to the power and performance forum

I wonder how accurate the banks guages are when used in conjunction with the Six-Gun. Mine always read 18-20 under WOT even on level 5. I still have the stock wastegate on but still expected to see a bit more boost. Do you think the guages are under reading or is this normal and should I go for the wastegate and bring the boost up a bit?

neverenuf


What is the vintage of your 6 Gun? I bought mine in Jan 04...








Don't have the number, but there was an update before the "race" box came out. I bought mine in April 04 and the SixGun that replaced it was May 04. There is different versions.

You should be hitting higher than 20 psi and the stock wastegate. With my juice I can max out the attitude(it only reads to 26) even on the 90 hp setting. Edit: I dont know if banks reads low or limits the reading to 20??? I would stick a actual boost gauge on it before i monkyed with the wastegate, and actually IMO you wont pick up anything top end wise from screwing with it. Wastegate may have a problem though, like a leaky line or just shooting craps. Verify with a gauge before you do anything though.


Jungle boy, were you at? You may be able to link up with another member with a scanner and they can take a look at your throttle %, or a juice/attitude will do it too. A juice is pretty easy to hook up. Or the dealer should beable to look at it too. Just yank your banks stuff(everything but the exhaust)Edited by: ratlover

JungleBoy,
I am a bit suspicious of the low voltage on the TPS. Boost readings on the electronic gauge may be faulty and it wouldn’t hurt to back check it as some others have suggested. What are your EGT readings like? Do your boost and EGT levels drop when running on Level 1?

Ratlover,
Although the boost signal is capped going back to the ECU to prevent overboost codes, the reading delivered to the gauge should be the actual boost as measured at the MAP sensor.

Peter T
Banks Power

I've seen 23psi of boost on the banks Dynafact gauge. This is just with the SixGun, no BigHead.Edited by: neverenuf

I am not reading anything above 20psi. The other night I had it on level 5 and got on it on the on-ramp to the freeway, while I was doing 90 before I even merged onto the freeway I didn't see anything over 20 psi. Im gonna go for a spin and make sure im not just imagining things. Anything I can do to try and make more boost? like heavy throttle up-hill or lockin th T/C?

locked up 5th gear wot will get the most boost. Something dont sound right, I would assume a screwy gauge first. Hows the airfilter, not crusty is it?http://www.dieselplace.com/forum/smileys/Big Smile.gif

chaps,


When I hit 23psi it was pulling a 5er weighing over 15k pounds. I don't see over 20psi unladen.

I can hit over 20 with my juice set to 90hp......I may have to go play tongiht but I think I can hit over 20 tuned to stock? or am I nutshttp://www.dieselplace.com/forum/smileys/Confused.gif

I prob. don't see 5th as often as most guys do considering im running 40 inch tires with stock gearing, so my gears feel alot longer than they did stock.


neverenuf - that makes since and I will be towing our 30ft WW this weekend so I will see what it reads then, coincidently our buggy will be inside which is named..........NEVER ENOUGH.


ratlover - let me know what you see especially if you tune back to stock.

I am running my predator on the 86hp setting and have isspro gauges. I see a max boost(stock accuator) at 26. My turbo gauge is t'ed into the wastegate hose. Is yours, or is it a drill and tap type?

neverenuf - that makes since and I will be towing our 30ft WW this weekend so I will see what it reads then, coincidently our buggy will be inside which is named..........NEVER ENOUGH.








It never is, is it?http://www.dieselplace.com/forum/smileys/Evil Smile.gif

I have banks six gun with speed loader , 4 in exhaust ,and bighead wastegate actuator did five turns and at wide open in level six am getting 25 to 26psi of boost

Stock, I can hit just over 20 but not 21. With Banks at level 6 I can hit 24. No load (trailer) required but WOT, uphill.

Turned the juice down to level 0(I think it still adds about 10hp???) and ran her from 72 or so(so she wouldnt kick down) in 5th gear up to 2600rpm or so......I got too bored waiting for the spedo and tach to go higher to try to go any faster. How do you guys live stock? I actually had time to look at my gauges durring accelerationhttp://www.dieselplace.com/forum/smileys/Disapprove.gif all mods in my sig. I hit 22#'s


I jumped on it with the juice turned to 125 hp in 4th gear with no kick down and hit 26psi. Had to back off, traffic was approaching fasthttp://www.dieselplace.com/forum/smileys/HiHi.gif


This is all unloaded in my realativly lite truck, all read from my attitude display. It maxes out at the 26#'s too, gauges are on the way so i should be able to get a confirmitory reading.

Ratlover says,Turned the juice down to level 0(I think it still adds about 10hp???) and ran her from 72 or so(so she wouldnt kick down) in 5th gear up to 2600rpm or so......I got too bored waiting for the spedo and tach to go higher to try to go any faster. How do you guys live stock?


Thats what im thinking too !!! WHen i hear people say that they have more power than they know what to do with stock im thinking wow , not me . Gotta luv the mods!

JungleBoy,
I am a bit suspicious of the low voltage on the TPS. Boost readings on the electronic gauge may be faulty and it wouldn’t hurt to back check it as some others have suggested. What are your EGT readings like? Do your boost and EGT levels drop when running on Level 1?

Peter T
Banks Power





PeterT


EGT readings are good - I touched 1300F in Level 5 on a recent road trip, a sustained on-ramp entry on a rise. The max boost in Level 1 seems to be about 17 or so - EGTs won't reach 1300 under similar conditions...


Is there anyone in the Houston area (I'm west of town) who could help me determine if the boost readings I am getting are correct?





Thanks to all


JB

JungleBoy,


Contact Bob at Houston Performance Diesel, (713) 943-7618. He is very good and knows Banks product well.


Peter T

Peter T


Muchas gracias - I'll call Bob...


JB