OK, so you all know i lost 2 seconds with my last optic bump putting it back to the scribed line (you can quit laughing now). So now i've moved it again towards the passenger side about the width of the line, question here is, is that cam ring with the scribed line under the sensor suppose to move? I had it moving all over the place and don't know where its suppose to be? I just guessed at it, moved the optic to just past the line and locked it down. Truck runs, puffs pretty good black on sitting and hitting the throttle, haven't moved it yet. Any help?

I was waiting for you to push it a hair more and see if more advance would be benificial.


Don't worry about it sliding on the cam ring. It find's it's own place.Edited by: quantum mechanic

More black smoke, no increase, 0-60 in 17 seconds. All i can say is i've gotten performance from TDG... less performance that is.


Maybe its working for TDG and you QM but its definately not working for me. With so many visiting the site here i'd surely like to here from others that tried the optic bump and it has increased their power???...


Anyone??? Besides QM??

next time i touch that ******ing pump it will be to swap it for my 4911 mech pump.

I bumped my optic as described in the forum and felt a healthy kick from it took about seven tries to get it where it felt the best. Which ended up being about 1 to 1.5 mm towards the passenger side.

next time i touch that ******ing pump it will be to swap it for my 4911 mech pump.


AH COme On Lupey Tells how you really feel, Don't hold back now.

Describe a healthy kick? Before and after 0 - 60's times increased? Pulled 6 - 8k trailer up hill in less time? Besides your sig says your chipped, i wouldn't call that a fair evaluation against a stock PCM. Whats your 0-60? Give me something to look forward to.

I dont know about anyone else's times, but mine, on a completely stock (newly rebuilt) engine runs right at 15, 15.5 sec 0-60 times.

15 sec or there about was my stock time with exhaust & Amzoil foam filter only.

You seem to be contradicting your own statements CR, you testified in this and another forum that after you moved the optic you observed more black smoke (more fuel) and also that moving it back to stock your 0-60 run took 2 secs longer, and yet you say that you've lost performance from my advice? I'm open to opinions and observations, but is that at all a fair or logical assessment?

TDG, OK i didn't exactly loose performance from your advise in that way, but i had to move the optic back to get rid of the runaway i was getting with it bumped, lost 2 seconds on that, which btw would have never occured if it had never been bumped, hense your advise helped me loose 2 seconds. Contradicting my my own statements, observed more black smoke, yes, observed more power, nope? That is not a contradiction, i did not get more power, maybe more fuel but not more power, might be a timing issue, i can't say. If it works for you then fine, i'm not done bumping yet and still may have something good to say about it down the road but as of yet, not much to say except it aint workin!


I also did not testify, i made a statement and that wasn't in another forum, it was here in another thread!


I do not want to get into a pissing match here. Just stating the facts as i have them.


Sorry to have offended you.

Hey man, I'm not trying to piss you off either, I thought we were pals on this is all, and I felt like you were taking a shot at me.


No offense intended on my part either, I want to see this baby take off like a rocket as bad as you do! ;)

I think we all would love to see this thing flying fast and low.

OK, so then PM me with how to make it a rocket (without pulling the engine into a few hundred pieces), you started me on this trail, don't you think you should finish the ride and share in the glory?

most definitely, I just wanted to make sure I was still invited to come along for the ride...


btw, you said you made another adjustment to the optic, any difference?

I made one more bump, got my 2 seconds back, 0-60 in 15 seconds again, seems to be just on the verge of run away again, i only did the run once as it was late but will try it again tonight on the way home, its also a lot cooler out today, maybe +5C only. Remember this is not what i would call an increase as the truck always ran 15 seconds before the bump.

Hmmmm...this truck is a real head scratcher.


Plenty of boost, monstrous exhaust, new tires, no codes....hmmm...I'd really like to see what your TDC offset is set at...


Have you tried pulling the Crankcase vent tube out of the intake elbow and plugging the inlet?

Nope, haven't done that. Last time i tried something similiar it blew out the dipstick and covered the engine compartment with a couple liters of oil, but then again that was the 95 truck. I'm not sure how much diff that would make on this truck, everytime i pull the upper plenim for a bump its got a trail of oil in the 2" tube from the turbo so i'd assume a fair amount of oil comes from that CDR through the turbo, but i only use about 1/2 liter of oil every 5000 Km's.

CR, I didn't change the chip and the optic at the same time and then compare it to stock. I've had my chip for about 6 month's which was increadible by itself, then about two month's ago I changed the optic which enhanced my truck further. I wouldn't have left it changed if i didn't feel it. I love when an expensive "stock" new super diesel "any brand" pulls up next to my 6.5 and thinks they're going to show me something. Then I show them that they need to go spend some money on performance goodies.

Performance wise I got my biggest improvement with a Heath reflash. With 12lbs boost & Kennedy exhaust I get around 11 sec 0-60. I have gone from 25mph to 50mph up Black mountain (near Ashville, NC on I40) pulling 8k. It was well worth the expense.


Even without the reflash I picked up 15mph with just the boost increase and exhaust and a normal shot of Stanadyne additive which I always use. You need the extra fuel to take advantage of any boost increase much over stock. Also the ECM will roll back or limit the output when it senses abnormal from stock conditions.

Matt, your the first person I know of to attempt both the optic sensor adjustment and a chip. Its good to hear some one has done that successfully, and noted even further gains.


CR, I've got an idea for you. You've done some tweaking on the optic, so let's reset your TDC offset. You need to get your truck up to operating temp (+70*C). Shut the truck off, Key on engine off hold the pedal to the metal for 45 sec, key off for 30 secs and restart. Let it idle and you should hear the engine change tone for a couple seconds and return to normal, do that and see if it makes any difference.Edited by: Texas Diesel Guy

That will reset the TDC offset? To what? And what does that accomplish (just cause i'm a total idiot when it comes to timing for a diesel.)http://www.dieselplace.com/forum/smileys/smiley5.gif

PCM will recalculate your TDC offset to correct it to what the pump is set at now.

Hey your pretty quick today!


Did that, haven't gone for a burn yet and not much point either, roads are covered in ice here and have 4" of snow since yesterday, will have to wait till i hit the pavement tonight, seemed to be just the slightest stumble on start-up, and then i reved it up a couple of times, did the worst run-away yet, just once, only been a few minutes here but it hasn't done it again.

that stumble was the PCM commanding 0 advance to compare to crank sensor and calculate your new TDC offset, thats a good sign, means it was successful.


On a side note: I did some more adjustments to my optic yesterday while I was replacing the vacuum pump. Holy cow! I see no reason why you '00 shouldn't be able to accomplish similair results to my '94. You have higher gear ratio, bigger exhaust and newer HD engine/PCM, it really shouldn't even be close.Edited by: Texas Diesel Guy

TDG does this only work for the OBD II trucks?

I've done it successfully on both in '94-'02 models, so have several people on this site...QM, CR, mattsparacio and I'm sure there's others.Edited by: Texas Diesel Guy

yes sir I know yours is but I was asking if that would work for both OBD I and OBD II trucks

I've done it successfully on both...

I've done it successfully on both...


Opps I guess i missed that part of your anwser sorry bout that

0-60


16.5 seconds


Maybe i should have bought a D'Max... lol

have you considered Bully Dog Propane Assist? Would work well with the Pot switch.