I need help. The Duramax store has a 5" exhaust system on sale. The question is, does the 5" buy me anything really over the 4", since I would think that the fluid dynamics would really be limited by the 4" downpipe rather than the rest of the system, or would the lower EGT caused by the venturi effect shifting from the 4" to the 5" pipe be better. I'm not afraid of having a loud exhaust, in fact I kind of like it. Also, anyone out there have the 5" offered by duramaxstore.com with or without the muffler replacement pipe? 440.00 advertised seems like a pretty good price to me.


Dennis

baimpala,


We sell a fairly large number of 5 inch systems, with and without mufflers, unless you're at or over 500 RW HP the 4 inch systems we sell will do all you need to have to keep EGT's in check. Our 4 inch systems are available in aluminized, T-409 and T-304 stainless, we even have dual systems if you want them. If you just want 5 inch get it but remember a lot of folks have reported a loss of low end torque with it on a lightly modded truck. Call us if we can help you with any questions etc.


Mark @ DPPI

I've been running my 4 into 5 system for some time now. Mostly for the awe (or testosterone) factor. No loss of torque here whether dyno testing stock (less programming) or at 495+

Short answer, no, but they do look coolhttp://www.dieselplace.com/forum/smileys/Big Smile.gif. BTW I believe the down pipe is a lot smaller than 4".

how do you lose low end with a turbo motor? I though scavenging was a non issue with a turbo? Just curioushttp://www.dieselplace.com/forum/smileys/Confused.gif

http://www.dieselplace.com/forum/smileys/Big Smile.gifThe KD 4"-5" looks awesome, its alooks thing

Kennedy is the dyno running now?

Yes it is!

Must be playing with some tuners JK as i see you updated your sig. http://www.dieselplace.com/forum/smileys/Big Smile.gif

Must be playing with some tuners JK as i see you updated your sig. http://www.dieselplace.com/forum/smileys/Big Smile.gif








That was all but the kitchen sink. Truth be told, the highest HP rated mods are NOT yielding the highest numbers as of late...

Whats the low down JK, what is putting down the power?

I've got it and love it. my truck still has the cat on it, it keeps it too quiet for me. no gauges or heavy tow yet. minor issues with install on dually and molded mud flaps, nothing to worry about. i ordered a custom tip, not here yet. duramaxstore.com does not sell a tip for this system

I do not think anyone is losing low end torque. This sounds like the same one that think they get 1-2 MPG better with each and every mod. I have read on here and other boards that exhaust, air intake, boxes, fuel filter, taller tires, bed covers, bug shield, and even stacked boxes will ecah add 1-2 and sometimes 3+ MPG. What I want to know is "Where are these trucks that are getting 30 MPG? (I know; the ones with the on board mileage readershttp://www.dieselplace.com/forum/smileys/Clown.gif)


John K; I am hoping you do a write up on your findings! With your Dyno. can you test the tradional way and the way Banks test? Or is it just one or the other? I think it would really clear things up if we could compare different boxes both ways on the same day and the same dyno, with the same operator, and the same truck.


Thanks!

Whats the low down JK, what is putting down the power?





TST Comp (older one), and HJAT5 are neck and neck. Next closest is about 20HP back...





Had to scratch my head, and rub my eyes, but I can repeat the results on different days as well...

Painter, the exhuast that you have in the KD one, right? Do you have any pictures of your setup?

Whats the low down JK, what is putting down the power?





TST Comp (older one), and HJAT5 are neck and neck. Next closest is about 20HP back...





Had to scratch my head, and rub my eyes, but I can repeat the results on different days as well...





So, how much is a HJAT5 putting down?

On my truck, mid 450's and 920's. consistently

wow, nice. What are you at stock? 240-250? So you are seeing a ~200hp improvement? http://www.dieselplace.com/forum/smileys/Clap.gif

BUILD YOUR OWN 5 INCH SYSTEM, ITS MUCH MORE ECONOMICAL. THAT IS IF YOU HAVE THE MEANS AND A WAY TO BUILD IT. BUT, IF YOUR LOOKING FOR THE HIGHLY TOUTED "SERVICE AFTER THE SALE" THEN YOU MAY WANNA BUY ONEhttp://www.dieselplace.com/forum/smileys/Embarrased.gif

200 HP OUT OF A 145 HJ/ATTITUDE.http://www.dieselplace.com/forum/smileys/Ermm.gif AT LEAST COME UP WITH A BELIVEABLE COCK OF BShttp://www.dieselplace.com/forum/smileys/Embarrased.gif






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<TD class=bold>Kennedy wrote:

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<TD class=bold>White Duramax wrote:

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TST Comp (older one), and HJAT5 are neck and neck. Next closest is about 20HP back...





Had to scratch my head, and rub my eyes, but I can repeat the results on different days as well...


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So, how much is a HJAT5 putting down?

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John K; are you running the Dyno like Banks run theirs? If so, are you seeing more low end torque as they say the 6 gun shows?

6 gun is so-so.





Running controlled acceleration over time Presently running 40mph to 75 mph in 15 seconds.





Again, I scratched my head, rubbed my eyes, and tried again.





Duramaximizer still only does 70 HP and 90HP Juice still does around 100 so my benchmarks are still consistent...


Stock


257.1/ 444.2





Juice 4.61 90


355/705.3





Juice 4.61 125


406.2/805.4





HJAT5


451.1/805.4





HJAT5 more boost


455.9/922.4





SAE correction would add 1.013-1.016 with present conditions.





On the dyno right now...





Must be the big lift pump and cobbled exhausthttp://www.dieselplace.com/forum/smileys/Ermm.gifEdited by: Kennedy

So much for Superflow,Mustang load cell dyno's being conservative more realistic numbers compared to DynoFlows ... After all the beat down dyno lessons and personal theories over the last year and a half ...


Mac *rolling eyes* *rolling eyes* *rolling eyes*

Dunno what to say, but bear in mind NONE of the units claiming 200+ have made their claim...

LOL I WILL AGREE WITH YOU ON THAT ----SO FAR. HOPEFULLY WHEN I GET MY BOX BACK FROM QUAD I WONT AGREEhttp://www.dieselplace.com/forum/smileys/Big Smile.gif

JK, out of curiousity have your tried more the 1 HJAT?

Jk, have you ran a big VA or the newest TST?

The factory downpipe is 2.5 inches so the only difference between 4 and 5 inch will be sound. I imagine Mark may be referring to powerstroke's losing tq with bigger exhaust since they change the downpipe also that seems to make the difference. I know several that claim the 3.5 inch downpipe on a powerstroke feels better that the 4 inch downpipe.Edited by: CPMac

6 gun is so-so.





Running controlled acceleration over time Presently running 40mph to 75 mph in 15 seconds.





Again, I scratched my head, rubbed my eyes, and tried again.





Duramaximizer still only does 70 HP and 90HP Juice still does around 100 so my benchmarks are still consistent...


Stock


257.1/ 444.2





Juice 4.61 90


355/705.3





Juice 4.61 125


406.2/805.4





HJAT5


451.1/805.4





HJAT5 more boost


455.9/922.4





SAE correction would add 1.013-1.016 with present conditions.





On the dyno right now...





Must be the big lift pump and cobbled exhausthttp://www.dieselplace.com/forum/smileys/Ermm.gif

what ver. of software are you testing in the six- gun and what were your numbers. how much boost. I have not seen over 20 but think it may be due to cat and egr.

Let's see if I can get them all in one reply here:


I've tried at least 2 different HJAT units.


I've tried the VA 230 (recognized as 230HP file by the VA Smart load programmer) as received/programmed from a vendor friend. I've got the older TST. I've called Greg a couple of times and sent emails, but haven't reached him. As for program on my TST, Kyle(?) ran my unit at GR didn't he? How did it compare to the latest?


Exhaust: It's good and well possible that we see little/no gain from the 4" "downpipe" as commonly referred to. There may well be just as much power in the 3.5" stocker, THEN stepping to 4". Dunno, and doubt I'll ever test it as it's too much BS to try to promote what would be perceived as a "lesser" or "inferior" system. I have a 2004 LB7 slated to go under the knife, and we may just start at the back and work ourway fwd. For reference, this bone stock 2004 did 250.6/433.1 and 90 HP Juice did 344/686.7.





Did not know there were varying versions of the 6 gun. It did 343/725 without the speed loader. Keep in mind that the TQ was a brief peak at 2250 rpm. Still waiting to hear back from Banks though on how boost affects it, as I have a lot of "wastegate" dialed in.





Best I can make of my notes, the Banks around 1300°f and boost was mid 20's. 90 HP juice was 1312° with 25.8 psi.





Boost is post intercooler, and EGT is with a 1/16" diameter probe which is lightning fast.


Edited by: Kennedy

quote~Did not know there were varying versions of the 6 gun. It did 343/725 without the speed loader. Keep in mind that the TQ was a brief peak at 7250 rpm ~end Quote


Am I reading that right ,7250 RPM ?? Your dyno isn't very conservative ,... Maybe you better read the operating instructions again or get the power people back in there .... http://www.dieselplace.com/forum/smileys/HiHi.gif





Mac http://www.dieselplace.com/forum/smileys/Geek.gif

John,


Does your TST "burst", if not how did you stop it?

It's OK on it's own, but doesn't play well with others...





I had it revised some time back. IIRC there are no notations on it though...

Did not know there were varying versions of the 6 gun. It did 343/725 without the speed loader. Keep in mind that the TQ was a brief peak at 2250 rpm. Still waiting to hear back from Banks though on how boost affects it, as I have a lot of "wastegate" dialed in.





Best I can make of my notes, the Banks around 1300°f and boost was mid 20's. 90 HP juice was 1312° with 25.8 psi.





Boost is post intercooler, and EGT is with a 1/16" diameter probe which is lightning fast.



this is straight from banks.
There has been some confusion about this sequence because we have had some variations in software in our product. Here is a procedure that will work for your product no matter what version of software you have, or what you have done or been told previously. To detect the SpeedLoader after everything is installed: Set the switch to the #1 position. START the engine (previous instructions said Key On, Engine Off). Leave the switch in the #1 postion for at least 5 seconds while the engine is running. Move the switch to the #6 position for at least 5 seconds. Move the switch back to the #1 position for at least 5 seconds. The sequence is now complete.

the white label on the module i have has rev C software. i know of others that have rev A that was done earlier. dont know the difference but i do know what the end results are. WHAT is the SERIAL # on your module.