Alright, finally got the Whip in on the 6.0 & dynotuned. Ditched the Whipple electronics, did 42lb injectors, Walbro 255 inline pump, 3.75" pulley, Whipple cold air intake. Got 7lbs boost @ WOT. Best run we got was 352 rwhp & like 430 torque. Is that good? Why/how are you 5.3's getting 400-500 hp?

Only thing I can think of is it's a 1500HD 4X4 with 3.73 rearend, 4L80E trans, 285 tires, true dual exhaust (but have 2 factory cats) - am I losing that much in the drivetrain? Supposedly, stock I had 300 hp at the crank & the Whipple is supposed to add 150 hp which would be 450 @ the crank - generally what is the drivetrain loss percentage 20-30%??

Feels great & pulls hard so I'm not terribly disappointed, but am curious how you 5.3's are getting such high hp. Thanks all & I couldn't have done this without this forum! You guys/gals rock!!

 

Dynos all give different #'s and should be used as a tool to judge improvements or for tuning. Nobody wins a race on a dyno (do they?) You're #'s seem low to me but the 4L80 is a power sucker, or so I hear.
Get to the track!

 

I had a friend at r&d dyno and he has seen 80e's soak up between 15-25% in drivetrain loss. yours is at 23% so ive seen that before... but that is on the high side... how many miles have you put on the trans?

 

What rpm did those values occur at? What was your AFR, IAT's, timing etc?

 

Don't feel too bad...I am in the same bout as you.

I actually have less than you with my maggie. I only got 70/70 out of my charger.

I lost about 24% of power through my trans in my baseline. Mine too was rated at 300hp and the baseline dyno showed 230rwhp/275rwtq.

 

The first thing you should have done is made the dyno run all stock.
This would have given you a base to work with on that dyno.

Then do the whipple, the injectors, fuel pump and tune.
And make a new modified run to compare with first stock run.
if your making 352 now with the whipple then bone stock
You may have made 230 or 240 to the rear wheels on that dyno.

 

For me with the Whipple:

Stock dyno run:
230rwhp/356rwtq

After Whipple, Injectors, (Stock fuel pump), Whipple intake
360rwhp/478rwtq

After i got it tuned with the Whipple on it
398rwhp/512rwtq

I have since tuned this thing even further and would expect to have broken the 400rwhp threshold by now but have not had it back to the dyno. I suggest if your air and fuel look good and you have little or no KR, drive it for a little while and then in a month or so, get it dyno tuned to tweak it out. You should be able to pick up 25/25 with a good tune easily. I agree that a dyno is just a tool to measure advances in your setup. I was consumed by those numbers at first too, and thought mine should have been higher......but its all about what it will do on the road. Congrats on the blower! Have fun.

 

I'm going to try to answer several questions all at once since I'm just getting back to this post:
1. Trans. only has around 31,000 miles on it.
2. I'm a newbie at FI & the tuner didn't give me alot of info, so I'm not sure how far he advanced the timing, etc. The rpm's are on the dynosheet I believe, but that's in the truck & I didn't drive it today.
3. There were alot of coulda, woulda, shoulda's with this whole endeavor & many lessons have been learned. This cost me an arm & a leg anyway, so I decided not to do the pre-whipple run. That probably would've answered several questions, but the cost & hour drive detered me from doing that. I'm happy it's done & running good!
4. I may not be that far out since I see whippled496 is roughly 40 hp more than me, since stock the 6.0 & 8.1 have a 40 hp diff at the crank.

Still curious how the 5.3's make so much hp?! Basically comes down to the drivetrain & bigger tires??

 

Sounds like you may want to visit another tuner. May not be the case but is he well versed in these motors? If not I'd suggest seeking a dyno tune from someone that is very familiar with the LSX type motors.

 

I've seen 350+ on a mild 6.0L N/A. I'd keep working on it.