Engine/Transmission (1998.5 - 2002) Why don't I have 400rwhp?????

[Batman]

Hopefully this is the right spot for this... ... ... ...



Last time I dynoed my truck I had DD2's, stock HX35, Edge Comp, 4" exhaust, K7N in the stock box... ... ... . 355rwhp - 775 ftlbs tq



I just dynoed again (same dyno)... ... I now have: BD3's, Piers HX-40, Edge Comp, AFE megacannon... ..... blah, blah, blah... . 365rwhp



I know my truck has ALWAYS been on the low end as far as power (compared to other trucks same year with similar set-ups).

But, I should be somewhere btween 400-415rwhp... ... ... ... not 365!

I pulled 232 with the comp off... ...

Additionally, I couldn't muster more than 33PSI out of the turbo. Havent been able too on the highway with the Comp on 5x5 either.



Could I have a bad sensor someplace or maybe need a reflash of some sort??????



I'm pretty sour about this whole thing, considering the cost of the injectors, turbo, and air filter is not cheap... ... ..... and definately not worth 10rwhp.



I have checked all my boost clamps, checked all my electrical connections for the Comp (which seems to be fine since it added what it was supposed too)... ... ..... what am I missing?



TIA for any suggestions.

George

 

[KLockliear]

Did you ever dyno your truck stock? 232hp with the box off, but with BD3's, and a HX40 is extremely low. I would say you're about 70hp off the pace right there. Now, if the truck made 165hp stock, that would be about right.



FYI, our shop truck makes 305hp with no box, Stage 2's and our HX-40. That's a 2001. 5 auto, 4x4. 465hp with the UFM on 5. Made 212rwhp stock.

 

[Batman]

Keith, thanks for the quick reply.

The closest I've come to dynoing the truck stock was with DD2's, Edge EZ, K&N in the soitck box and 4" exhaust... ... ... same dyno as above (Dynojet BTW)

275rwhp is all she had then.



I will tell you that if I completely disconnect the comp, the truck with the DD2's or BD3's is a pig... ... ... doesn't want to move out of it's own way.



Any ideas???

Thanks

 

[BIGDIG]

OH WELL,BACK TO THE BAT CAVE!!!! :-laf

 

[Mad Bomber]

H.P.?

The injection pump is in a bell curve some are high some are low. I did a 244 with a total stock truck.

I would also check the mapand ait sensor they clean up with carb cleaner. Eric

 

[Air Bulldog]

Batman what trans do you have?I have dyno my truck with an auto about 5 times and it was always around 325 hp. the other day I dyno it here and they let me do the driving and I found out why my truck dynos low it because it comes out of lock up and shifts down. I am use to the truck and keep it from doing that and it dyno at 431 hp and 865 foot pounds. You can put in a lock up switch to keep it from coming out of lock up,thats what I will have to do. I have a shift kit that makes my truck shift down up to about 65 and what happens is that when it shift down it goes above the peck h. p. range and thats why I always got low readings.

 

[Big White Beast]

What DHofeldt said...........

You need a good operator to keep it in lock up. Made a huge difference on the trucks that were at our dyno day. As far as boost the dyno wont load the truck enough to get max boost. Your elbow may not be right also. Clamp the waste gate shut and take a run. See what #'s you get that way. I've heard there's an adjustable elbow out there too.



Garrett

 

[Batman]

Thanks for the info guys... ... .



Yes, I have an auto, I use a lock-up switch for the dyno only, the TC doens't unlock. We run our own trucks on this dyno. Ihae had others run mine to be sure and they get the same numbers.



I will clean those two sensors and see if that makes a difference.



Thanks again.

George

 

[TORQUE THIS]

George, I feel the same... though I didn't dyno last year I never had a base number to go by.



PDR HX-35, DDIII's, EZ, BlueChip APB, AFE MegaCannon and DTT transmission... 367 RWHP

 

[RO'neal]

Originally posted by Batman





I will tell you that if I completely disconnect the comp, the truck with the DD2's or BD3's is a pig... ... ... doesn't want to move out of it's own way.

Mine is the exact same way! I was extremely disappointed when I installed the BD2's and didn't see a bit of difference I hope that someone will shed some light on this because I would really like to know what it is, if anything.

 

[KLockliear]

One thing to try is to get a Cummins shop to reflash your ECM with the newest software. We found that trucks built within a certain month range in 2000 (2001 trucks), had soft calibrations in them and were down on power. Made about 35hp less than a truck with a normal calibration.



That might be one of your problems.



Get a scan tool on there and see if the computer is reporting boost, IAT and coolant temp according to what is going on.



BTW, for all those that keep saying about the low boost figures on the dyno... . blah blah blah, remember here - the computer is at full fueling at 20psi, and these Comp boxes at around 26-28psi. Once you exceed that, you've got all the fuel the truck can put in. Those few pounds of boost aren't going to make much (if any) difference in power on top. Also, since everytime you dyno on an inertia dyno, you deal with the same inertia model, your boost will always get to about the same reference point with a given setup. For comparison (what the dyno is really for), it's a non-issue.

 

[HEYBOSS]

Batman

I know what's the problem, nothing to do with inj or boxes.



Ready for this, something you never thought of.



It's the color of the truck Get a Dark Garnet and it will dyno 350hp just with 275's and comp, can you imagine what it will do with BDII's and HX35? :-laf :-laf

 

[HEYBOSS]

Originally posted by TORQUE THIS

George, I feel the same... though I didn't dyno last year I never had a base number to go by.



PDR HX-35, DDIII's, EZ, BlueChip APB, AFE MegaCannon and DTT transmission... 367 RWHP

I did dyno my truck stock and it was 163 RWHP then with just ez it did around 202hp I believe. Last time I dynoed 350HP with comp and 275's with stock air filter, I don't know now what it will do with BDII's and AFe but I'll bet should be somewhere 370 to 380hp, it sure has an impressive kick of the pants and a lot more Hp with the BD's. Oo.

 

[Batman]

One more thing I've noticed... ... ... ... ... . before I go to Cummins.



moderate to heavy acceleration. Truck seems to lose serious power during shifts... ... . most noticable 3-4 shift. It feels like it falls on its face right after shifting. This doesn't seem to be defueling (yes under heavly throttle it does) it happenedprior to injector and turbo upgrade.



Fuel pressure fine, doesn't go below 13psi, no boost leaks... .



Heyboss, your truck has always had more sack than mine, rub it in a little more please.

But, that is a good point, same truck, later production model.



:{

 

[Chipstien]

Originally posted by Batman

It feels like it falls on its face right after shifting. :{

Didn't some 2001's have a torque management when in overdrive. Sounds like the problem to me, get a reflash.

 

[WadePatton]

I thought mine was peppy.

Originally posted by HEYBOSS

It's the color of the truck Get a Dark Garnet and it will dyno 350hp just with 275's and comp, can you imagine what it will do with BDII's and HX35? :-laf :-laf

GREAT--so when I get the clutch in and hit the dyno I can look for big numbers!



Did a pretty good burnout today after we put the muffler on--yes 5" straight pipe is a bit much. It's sort of a tradition at the muffler shop. Nothing but black marks out front. I gave 'em a tire smoke/black smoke slurry. And one UNHAPPY stock clutch.

 

[KLockliear]

Have you dynoed it with the box off? Here's the math: Stock at 163hp (wow that's low) + ?100hp? for BD3's + 150hp for a Comp when mixed with injectors that big + 35 for the HX40, you should be in the 450 range.



Now, before you had DD2's (which should be 25hp less) and the HX35 (about 35hp or so less than the 40), so you should have made around 375hp, so 355 isn't that far off.



Now, again, did you ever dyno before or now with the box off, just on injectors? If so, what did it make? It should have made around 240hp with the DD2's, and around 265hp with the BD3's you have now (if they make 100hp ~ which I can't tell you).



Are you at this level without the box?

 

[Huff N Puff]

Didn't see what kind of trans you had

Possible transmission problems could be why you're not getting full boost,and why you are not getting the HP to the road. Merv

 

[Batman]

Keith,

Yes I did dyno with the box off. This is kind of odd also.

DD2's HX-35 226rwhp

BD3's, HX-40 - 232 rwhp



No, no trans problems. Had that checked already.



Keep those ideas coming please.

Thanks,

George

 

[Batman]

Just edited my last post, BD3's no box... ... ... 232 rwhp