Rokktech Crank Sensor Installed...

[DGrossman]

Has anyone done any before and after dyno tests? Getting ready to put mine on but don't have anything but the butt-dyno...

 

[SRadke]

How much timing advance does this thing give you? 2°? 4°? I've been playing with mine a little and feeding it false data..... you can make it do some strange things.



-Scott

 

[67guzzler]

Scott -- I believe it's 2° but I'm not positive.



How have you been playing with yours & feeding it false data? I'm curious & need details!



Thanks!

 

[JEly]

Do you need to send in a sensor and have it re-done or do they sell them ready to go



JIM

 

[67guzzler]

Jim -- You can do either. They have a link for $69. 99 that includes the sensor. There is some confusion about this but they have sensors and they'll send you one for that price. They'll modify yours for slightly less. I just preferred to get a new one. Good luck.

 

[jwduke]

I'm curious how much mpg improvement a guy will get towing??? This looks like one bomb that does work!

 

[HMistica]

After reading everyone's post I ordered one. Is there any way the dealer could find out about this mod without telling them. I'm worried about voiding my warranty but I'm putting it on anyways. It's worth the extra couple MPG's.

 

[Matt400]

Anyone with pics of the OEM and modded one side by side or input on what the change is? My guess is he relocates the sensor in the barrel off to one side.

 

[FJfonda]

Anyone with pics of the OEM and modded one side by side or input on what the change is? My guess is he relocates the sensor in the barrel off to one side.

The guys over at DTR have been banging this and modifying sensor the tone wheel around for a while. Check it out

http://www.dieseltruckresource.com/dev/showthread.php?t=71543&page=1&pp=15

One of the guys has comparison photo's of a modified vs stock sensor in his reader rigs. The sensor is "ground" on one side allowing it to pivot on the attachment bolt. I may take some time to find the post as there are 20+ pages of good reading to go through!!!



Here are my impressions on my sensor install:



I installed my Rokktech offset sensor last night and noticed the following this AM in my commute to work:



- Cold performance was pretty much the same (52 degrees this am)

- Once warm, the SOP throttle response is much improved

- The boost at full throttle (in 1st and 2nd on 48RE) seems to fluctuate a lot more. Previously it would peak at 32 psi then drop to 25-26 psi and return to 28 or so and lock in. Now it peaks about the same but swings back and forth a few times before settling in.

- I forgot about the mod a few times and was pleasantly suprised when accelerating from a stop.

- Engine noise is about the same but at 28,000 miles, I have the cam gear noise which would mask most noticable noise changes at idle. At cruising speed I could not notice any difference.



Disclaimer: I mostly tow with this truck and drive it minimally on my commute. Although I did commute in it earlier in the week, I may no be as "in tune" to unloaded performance changes as others are. I plan on towing soon and will update my oservations when I return.

Next step: Loosen the tone wheel and move it to the most advanced side of the "slop".

 

[67guzzler]

Anyone with pics of the OEM and modded one side by side or input on what the change is? My guess is he relocates the sensor in the barrel off to one side.

Matt -- I posted these in a thread that's been bumped down but figured these could help. These aren't too good but maybe these might be helpful?



Some of them are large pictures. When I get within 1 foot using my 6 year old 1. 3 megapixel non-zoom digital camera, everything is blurry. My digital camera sucks so I actually had become innovative to use my handy-dandy scanner.



I suggest saving them to your hard drive by right-clicking on the links and selecting save as and then put them on your computer somewhere you can find them.



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OH -- I almost forgot the most interesting part!



See the shaved edge of the OEM unit? Picture rokktech5.jpg at the top right. That was damaged (and supposidly still functioning) like that when I removed it. After 4 days it just dawned on me why it was damaged. I lost 2 serpentine belts after taking delivery of the truck. The first at 700 miles and the 2nd at 1200 miles.



What would happen is the belt would jump off the pully the distance of one of it's ribs. It would then shave off that much of the belt but the belt would still work. By the time I got down to 2/3 of a belt, I'd seen shredded pieces here and there. But what I didn't realize was that the belt was jumping down at the crankshaft pully. This would make it rub on the sensor and wear it away. Technically, I guess DC owes me a new sensor!!!

 

[Sarge]

I posted in the last thread on this sensor, but for brevity I will recap. I installed the sensor the day before I left on a 4700 mile RV trip. I towed about 95% of the time. The increase I noted while towing was 1. 0 to 1. 5 MPG, depending on terrain. I run an EZ with the sensor, and have had good results. I run the EZ on the lowest level.



The fiver weighs between 11,000 and 12,000 pounds, and I was able to pull the Rockies, up over Vail and still got 9. 1 MPG. On the long grades I dropped to 55 MPH in 5th gear. Did keep an eye on the EGT's, as I could hit 1400* on the long steep ones. All MPG was hand caculated. The sensor paid for itself about 2 1/2 times on this trip.



One interesting test I made on the trip was I unplugged the EZ and ran just the sensor to see if the MPG would increase. After a tank of fuel and 300 miles towing, I found that the power was down considerably, as were the EGT's while pulling the hills. However, MPG did NOT inprove. I can only assume that due to getiing less power with the EZ unhooked, I had my foot in it harder to achieve the same speed. My usual towing speed is 65 MPH, and frequent use of the cruise, unless I am in the hills or mountians.



All in all, I am happy with the BOMB. Better MPG, small power increase, and low cost. Sarge

 

[Matt400]

Interesting pics, looks like all he did was shave down one side of the sensor body so it could be rotated in the sleeve it mounts in.

 

[67guzzler]

Interesting pics, looks like all he did was shave down one side of the sensor body so it could be rotated in the sleeve it mounts in.

Yup -- But the quality and uniformity of the shaving is first rate... .



Sorry the picture quality isn't too good. Tough to get closeups like that.

 

[skorski]

rokktech

OK i am interested so I E mailed rokktech twice for two days and no answer. How does one buy one And if it takes this lone to buy one What will it take to solve a problem Oo. Oo.

 

[67guzzler]

OK i am interested so I E mailed rokktech twice for two days and no answer. How does one buy one And if it takes this lone to buy one What will it take to solve a problem Oo. Oo.

Apparently they had some type of emergency or issue. I waited about 2 weeks to get mine. I received 2 emails from them telling me about the delay and I did get mine once they told me they shipped.



Here is the first email:



"Hi jay



We were delayed last week for four days by something unexpected.

Sorry about the delay.

It was shipped today by priority mail, 2-3 day expected delivery,

small flat white box.



Thank you for your order

Paul"



I'm not defending anyone and I don't know what's going on but I believe that Paul at rokktech is a stand up guy. If you want one, hang in there and keep trying.

 

[SRadke]

"Some sort of emergency" was named Katrina

 

[67guzzler]

Could have been. They're located in Washington state but who knows, maybe they have family or a supplier is in an affected area. A lot of the smaller entrapenurial companies like this are easily knocked off balance when things happen. I guess it's a time for a little patience and understanding. I'm sure everyone is scrambling on some level in some ways and will be for a while... .

 

[SRadke]

Has anybody done a before/after dyno run with one of these? With the ease of install they claim it shouldn't be tough to do. TST claims something like 15 hp from the timing advance on their box.

 

[ArchieAnz]

long term effects

Hey everybody,



Well, I'm new to this site but, I have been reading along for a while. I have a Bright Silver 2005 2500 ST reg. cab long bed cummins w/ a NV5600. It has 3. 73 gears and the stock 245/75/17 tires on it. I decided to try out this mod. Before this the best fuel milage I had gotten was 19. 3 going through the moutains driving from Norfolk, VA to Huntsville, AL. I have about 8,000 miles on the truck so far. I put the rokktech sensor in last night. I noticed right away that it does seem to be making more power on the lower end of the rpm scale. I also noticed before the mod it seemed to have explosive power beginning around 2000 rpms. Now it seems that the explosive power begins around 2200 rpms. I'm not quite sure but, I think it has lost some power between 1500 and 2000 rpms. Has anybody else noticed this? As for fuel economy... I couldn't tell you. I drive 4 miles to work everyday and that seems to barely be enough time to get the engine up to normal operating temp. That can really destroy your gas milage. Also... has anybody figured out if this mod has any bad long term effects on the motor. This is the only aftermarket equipment I have bought for this truck as I am trying to get longivity out of it.



Thanks,

Mike

 

[EEdmondson]

OK i am interested so I E mailed rokktech twice for two days and no answer. How does one buy one And if it takes this lone to buy one What will it take to solve a problem Oo. Oo.

I just went to their website and ordered one. When it gets here, it gets here... What's the big hurry?