patriot stg II 5.3's/ 224-581-112 dyno numbers
12-13-2003, 03:36 PM
#1
patriot stg II 5.3's/ 224-581-112 dyno numbers 389.9 hp, 375.3 ftbs SAE
untuned, but from the looks of things it wont benefit much, a/f was about 13.1 across the board. ill get the graph and atap logs up later.
mods:
PP Stg 2 5.3's milled .015"
comp XER 224/581/112 no advance
stock macs, stock 2.5" mac ypipe, 3" dynomouth exhuast
asp's
ls6 intake
home ported tb and maf
suncoast intake setup
bolts on etc . . . .
stock aluminum driveshaft
stock 3.42's
about run:
made with full belts
through my daily driver rims (15x8" prostars with 275 50/15 BFG Drags at 20lbs)
riddle me this though, the car made 367 hp and 362 ftlbs before the heads and asp's and trapped 112-112.5 mph consistantly. so i gained 23 hp and 16 ftlbs from heads and asp's, but i consistantly trapped 117.5-117.8 after the heads even without the asp's installed. same DA's, same weight (within 50lbs) no changes at all. this kinda confuses me, but im happy there was more of a track gain than a dyno gain
i plan on dynoing somewhere else to confirm these numbers
comments???
untuned, but from the looks of things it wont benefit much, a/f was about 13.1 across the board. ill get the graph and atap logs up later.
mods:
PP Stg 2 5.3's milled .015"
comp XER 224/581/112 no advance
stock macs, stock 2.5" mac ypipe, 3" dynomouth exhuast
asp's
ls6 intake
home ported tb and maf
suncoast intake setup
bolts on etc . . . .
stock aluminum driveshaft
stock 3.42's
about run:
made with full belts
through my daily driver rims (15x8" prostars with 275 50/15 BFG Drags at 20lbs)
riddle me this though, the car made 367 hp and 362 ftlbs before the heads and asp's and trapped 112-112.5 mph consistantly. so i gained 23 hp and 16 ftlbs from heads and asp's, but i consistantly trapped 117.5-117.8 after the heads even without the asp's installed. same DA's, same weight (within 50lbs) no changes at all. this kinda confuses me, but im happy there was more of a track gain than a dyno gain
i plan on dynoing somewhere else to confirm these numbers
comments???
Last edited by Tally TransAm; 12-13-2003 at 04:58 PM.
12-13-2003, 04:31 PM
#3
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Can you post the graph? Could it be that you picked up big time in the midrange and therefore the peak numbers don't look so great? You picked up 5mph, so they must be working.
I have a set of thoes head waiting to go on, hopefully I can find the time next weekend.
I have a set of thoes head waiting to go on, hopefully I can find the time next weekend.
12-13-2003, 04:46 PM
#4
Something is NOT right. You should be making an EASY 420 rwhp through a stock 10 bolt and 3:42's.
Done a leakdown test? Compression check? Fuel filter? A-tap it? What did the injectors look like? Lots of factors here, but you're definately down on power for some reason. Not trying to be negative, but I will not sugar coat it saying you should be making a lot more. JMO
That combo should be good for at least 119-120 in the 1/4. Nice TQ curve though...
josh
Done a leakdown test? Compression check? Fuel filter? A-tap it? What did the injectors look like? Lots of factors here, but you're definately down on power for some reason. Not trying to be negative, but I will not sugar coat it saying you should be making a lot more. JMO
That combo should be good for at least 119-120 in the 1/4. Nice TQ curve though...
josh
12-13-2003, 04:52 PM
#6
Originally Posted by Damian
Something is NOT right. You should be making an EASY 420 rwhp through a stock 10 bolt and 3:42's.
Done a leakdown test? Compression check? Fuel filter? A-tap it? What did the injectors look like? Lots of factors here, but you're definately down on power for some reason. Not trying to be negative, but I will not sugar coat it saying you should be making a lot more. JMO
That combo should be good for at least 119-120 in the 1/4. Nice TQ curve though...
josh
Done a leakdown test? Compression check? Fuel filter? A-tap it? What did the injectors look like? Lots of factors here, but you're definately down on power for some reason. Not trying to be negative, but I will not sugar coat it saying you should be making a lot more. JMO
That combo should be good for at least 119-120 in the 1/4. Nice TQ curve though...
josh
its not running out of fuel, did a compression check about 2 weeks ago for ***** and every cylinder was right around 205 (+- 10 psi)
i agree the hp numbers arent there, but the it trapped 117.8 before the pullies in a DA of +500 ft and raceweight of 3400 lbs. pullies probably added 1 mph. 119 mph aint bad in a car with stock gears. thats why i dont understand gaining 5-6, maybe 7 mph (post pullies) at the track, and 20 something hp. . .
ill have the atap logs tonight, gotta get them from a friend
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12-13-2003, 05:47 PM
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Numbers seem low to me, get that thing tuned and see what you can pick up, i'm sure there is some still left in it. With 5.3 heads and that cam it seems like the common numbers are 410-420.
12-13-2003, 06:08 PM
#9
Yeah those number do seem pretty low. I think those Macs might be holding you back 5-10rwhp from LT's, plus tuning I think you could get about 5-10rwhp. I havent really seen Patriot's heads making high numbers? Could be that those heads dont flow as good as some other sponsors S2 5.3 heads?
12-13-2003, 06:12 PM
#10
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If you are trapping 117.8 at a raceweight of 3400lbs
(including you) at +500 DA then your numbers are
about right on, maybe a bit high.
My car dynos 407 through a 12 bolt and I trap 118 at
a raceweight of 3670lbs at +2000 DA.
(including you) at +500 DA then your numbers are
about right on, maybe a bit high.
My car dynos 407 through a 12 bolt and I trap 118 at
a raceweight of 3670lbs at +2000 DA.
12-13-2003, 06:17 PM
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I just got my Patriot S2 5.3's yesterday. I hope they make the power thier supposed to be. I'm confused and maybe someone could help me here. The box says Stage 2 LS6's, but the plastic on the heads say stage 3 LS6 5.3s?? 
Also the casting # from the factory is gone. I have these #'s on the heads 2227RO310865 and 2227169677. I'm lost here??? I know I ordered stage 2 5.3's from Texas Speed.
Also the casting # from the factory is gone. I have these #'s on the heads 2227RO310865 and 2227169677. I'm lost here??? I know I ordered stage 2 5.3's from Texas Speed. 
12-13-2003, 08:59 PM
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I've seen a 5-7 rwhp gain going from the macs to a quality Longtube header. Hows the mac y-pipe, i've heard that the quality is not the greatest on it. Those flow numbers on the heads look on par with the other 5.3's i've seen, i say try a different exhaust setup and get it tuned and then see what she can put down.
12-13-2003, 09:09 PM
#20
i REALLY cant afford new headers so the macs are staying
the mac ypipe has ballflange collectors, 2.5" pipes, and a 2.5" collector from 2.5" pipes. it doesnt flow too well, the rear secion of the exhuast also has alot of bends in it which may be hurting flow as well.
i dont know if this is contributing to the lower numbers, but its a chance.
the car has always dynoed low, but based on the gains ive had at the track i was expecting much more
the mac ypipe has ballflange collectors, 2.5" pipes, and a 2.5" collector from 2.5" pipes. it doesnt flow too well, the rear secion of the exhuast also has alot of bends in it which may be hurting flow as well.
i dont know if this is contributing to the lower numbers, but its a chance.
the car has always dynoed low, but based on the gains ive had at the track i was expecting much more