ib516

Thanks for the help with my injector questions everyone. I have decided to add RV275 injectors, a 4" exhaust, gauges, and a fuel pressure warning LED (lights if LP pres drops below 5 psi) to my 2002 24V with the 47re auto. I already have a superchips programmer I run at the lowest level and a K+N drop in filter.

Can anyone tell me about what hp/tq I should expect out of this combo? I know the superchips is around 40 hp/75 tq on the low setting, the K+N may or may not have any effect on hp, the 4" exhaust should add a few ponies/tq (10 hp/30 tq?), and the injectors should be good for 40 hp/80-100 tq. So, conservatively, I should have around:
235 hp + 40 (SCMT) + 10 (4") + 40 (RV275s) = 325 hp?
460 tq + 75 (SCMT) + 30 (4") + 80 (RV275s) = 645 tq?

Any of you guys lucky enough to run on a dyno have any opinions??
I know work on the 47re will be next, I expect that.

Sig added AND UPDATED
2002 2500 4x4 w/47RE, 3.55 gears/Superchips Tuner/BD J-Hook/Boost fooler

TxDiesel007

Hmmm

ou are adding figures up, which is an excellent basis for what "you might expect" HOWEVER, many factors will influence those numbers, temperature, humidity, and so forth. My suggestion would be to calculate at least a 10-15 percent HP loss to the rears. I know its a heartbreaker, but it might be more realistic..

sorry

Tx

blackdiesel

the hp and tq you started with is at the flywheel right? you will be suprised on how much power you will loose at the rear tires

MnTom

I just ran on a dyno for the first time yesterday and the owner of the equipment stated that we were more realistically looking at UP TO A 25% DRIVELINE LOSS!!! By the way, this is at a speed shop so the guy should have an idea of what he was talking about.
Tom

WildBill

I would not add any extra power for intakes and exhaust systems, it does not all add up! And also be aware that power adders are not rated for PEAK HP, they are rated for maximum gain! Go look at some dyno plots and you'll see what I mean. A tuner rated for 75HP is peak gain, meaning the area of the power curve with the biggest gain, where the peak power stock vs. with the same tuner might only be 25HP, so on a dyno you might get a 25 HP gain peak, but in the midrange you get the 75HP gain. Clear as mud, right? Also you can usually figure at least 15% drivetrain loss, 20% is average. More with 4X4 auto, less with 2wd manual, etc.

mr T

what year is the truck? 12 valve or 24 valve? ...fill out ur sig!

Rattlerattle

I have seen a number of people that show up to a dyno the first time adding up all the HP gains that are advertised. Figuring they are going to lay down 400 to 500 hp and actually dyno 200 to 250.

J BODY

Superchips doesn't have boost fooling capabilities correct? I would want a little more boost with the updates you're doing.

HOHN

With just a SC and 275s, you can expect around 250hp and 530ish tq (EDIT: at the rear wheels). The SuperChips is probably the least powerful electronic box on the market for 24V dodge diesels.

Air doesn't add power, so don't add anything for intake or exhaust.

Oh, and your K&N drop in is the worst of both worlds: filters poorly because it's K&N and flows less because it's in the stock airbox. Almost any other setup would be better, imho.

I think it's safe to say this is a 24V truck. I've yet to see a Superchips product for a 12V

blackdiesel

I agree with HOHN. I think hes pretty close on your hp and tq numbers. and k&n's are bad. Search for them and youll see what he means.

gman07

Am I missing something here? I thought air+fuel=power. It seems that if you have smoke and allow more air you will get more efficient burning of the fuel you are already adding...

Ian

i wouldn't spend any money on your tranny yet. I dynoed 331hp/773 ft/lb (with an aux. pump it should be around 370-380hp according to the tech) and my tranny hasn't shown signs of strain and its bone stock. Put a few more bucks into your hp mods if thats what you're after.

ib516

Thanks guys. I was quite sure I wouldn't dyno the numbers I posted in the first post, as I was sure they wouldn't just add up like that. I figured that there has to be someone on the forum here who has mods similar to what I'm planning that HAS been on a dyno.

Oh and BTW, I added a sig . I guess that would help wouldn't it? Anyway, keep the replys coming, still hoping for a responder who has a truck like mine, with mods like I'm planning who has taken a run on a dyno. Where I live, they want $185 to let you have a run on a chassis dyno. I'm far too cheap for that.

Mike Holmen

The super chip box doesn't have a boost fooler. I would get one and crank up your boost. This would more than likely improve your overall power.

HOHN

Yes, but the mild combo he's looking at, stock air will be just fine and will not cost him hp.

ON a diesel, fuel is power. You only need enough air to burn it. EGT is the best measure of the relationship between air and fuel.

If you have 350hp worth of fuel, you will NOT have more power at 800° EGT than at 1200° EGT, though the former is a lot "leaner" mixture.

On a gasser, yes-- air+fuel= power

On a diesel, fuel= power, air = EGT.