the run down.

140,000 mile old stock bottom end LS1. patriot stage 2 ls6 heads unmilled with .040 gasket. patric G 231/239 .617/.623 111+2 cam. ported fast 90mm with NW throttle body. underdrive pulley, intake, kooks 1 1 7/8 stepped to 2" headers with true dual 3" with x and bullets.

dyno was done in third locked through 4.10 gears and 305/45-18 tires(29" tires)

only changes from previous dyno is kooks headers with true dual over pacesetters and single 3"...and a ported fast 90mm instead of the LS6 with ported stock throttle body. same dyno, and worse weather this time.

the numbers seem great, but the track doesnt agree sorry about the cell phone quality graphs

down low gains:


up top gains:

 

great gains

 

what correction factor? is that STD?

 

yes the correction is in STD (like it says in the top right). i posted the STD numbers because they printed them with the low HP/TQ gains and the High HP/TQ gains.

the SAE numbers of the motor was 430.13 HP and 396.10 tq.

 

anyone else think it's weird that the curve of the ported 90mm followed the ls6 intake? i figured it would pull away after 6500 RPM?????

 

I think its weird someone spun your 140k stock motor to 7500rpm, what the hell is that

 

it did the same for me..

ouch!!

 

i told him to. been shifting 6900 to 7100 for about 5 years now. now i know i dont need to go any farther than 68 or 6900. and the rev limiter is at 7300. i told him to go until it touched the limiter.

 

Nice gains! No improvement at the track? Due to weather you think?

 

possibly weather, possibly gearing. running 4.10 gears right now...thinking about some 4.56 gears. race weight of 4500 lbs.

last time at the track my shiftpoint showed to go from 7190 to 5358 on the 2-3 shift and i crossed the trapps at 5200rpm locked...out of the power. 4.56 should put me across the line around 5800rpm locked. then i have the nitrous that i have to worry about running out of gear on.

 

What was your track results. 60 ft & 1320 et/mph?

 

12.40@108 N/A on the current setup.

60' is 1.67 to 1.72 N/A. the truck has 2 nitrous kits on it too but i havent flipped the switch in a while.

my best track time was 12.19@110 N/A with a 1.69 60'. that was with the 226/226 112+4 cam, ls6 manifold and pacesetter/single 3" exhaust (ORY). it was a COLD night though. -1500 DA or some crazy crap like that.

the dyno numbers at that time were around 390 tq and 410 HP uncorrected.

even still, i dont see why i dont trap a higher MPH. from 5500+ i am making more power everywhere in the graph. not just peak. 4.56 gear should put me higher into my power band though. hopefully i can gain in the 60' and mph dept with a taller gear.

 

You answered your own question. If you don't make big gains over your old cam until 5500 rpm (and you're only trapping at 5200 rpm), you're not going to see the big gains. Honestly, I think you'll go quicker by shifting closer to 6700-6800 rpm and keeping the converter unlocked. This way, you'll allow the torque converter stator to multiply torque a little longer and slip you to your powerband a little faster. In my experience, locking the torque converter only helps if you're above peak power by the time you trap, not way before your peak.

 

i tried different lock points and going completely unlocked anywhere from 6800rpm to 7200 rpm...they all made the same times and MPH. it "FEELS" much better locked though. the track says its the same though lol.

unlocked i trap 108 MPH at 5800 RPM.

i have never dyno'd with the nitrous though. ive heard that it makes the peak power and torque pull back? is there any truth to this? like, i peak around 6500 right now N/A, would i peak at 6200 with a 200 shot?

 

what does the truck weigh?

 

4500ish race weight.

 

Whats with the weird dip around 4800rpm? Is it going too lean or rich there?

Nice #'s though Stew

 

have you logged it running down the track?
in addition to the advice that Pat gave,i would log it to check for timing/fueling issues..or maybe converter issues
sometimes you don't get the same power at the track you got when dynoed..don't ask me how i know

 

Nope,air fuel is fine.We added alittle fuel and pulled alittle,that made it worse.With a few more degrees of spark it helped it but anymore and it made even worse again.So apparently it was best where it is at.
Stuart and I will be spending more time on the dyno shortly I am very sure.

 

yeah, we have dyno logs, track logs, street logs, and logs of logs lol. this was the first time on the dyno. i was surprised how close charlie had it nailed down with a street tune. we squeezed a tiny bit more out of it with 1* less timing but not enough to see it on the track IMO. every time we tried something it lost power. we only got to play with the tune for 3 pulls.