patriot h/c dyno
patriot h/c dyno i just installed the patriot stage 2 lQ9 STage 2 heads 59cc 2.05 valves and there 226/226 585/585 cam on my 2001 camaro ss. The car has Slp loudmouth, gutted random tech cats, Slp longtubes and y-pipe, underdrive pulley, Mti polished throttle body, mosier 12 bolt with 4.10 gears, Mti tuning, cut out lower air box, Mti air lid wit K&N, stock rockers, Msd wires, tr6 plugs, star stage 3 clutch, Bmr torque arm. I believe thats it.
I had Mti install the h/c package and tune the car. My dyno numbers are as follows with the stock throttle body and taylor wires.
uncorrected... 78.8 degrees corrected....
407.8hp/388.5tq..........413.3hp/393.7tq
A week later i added the Mti Polished Throttle body and Msd wires and here are my new numbers,,(also fixed a tps problem from the first dyno)
uncorrected....61.9 degrees corrected....
431.5hp/396.2 ...............404.3hp/371.3tq
the corrected power levels seem very low... anyone have any thoughts????
Patriot seemed very persausive that this kit made tons of power, but i dont see it.. or am i missing something .. or is some thing wrong..
i'll try to get the charts posted if i can get to a scanner. charts seem pretty smooth except for a very small amout on scribble past 6100, but its seems much more clear after the wire change and tps fix...Like i said just seems low after seeing cam only cars push 400-410. any thoughts would be appreciated.. thanks
I had Mti install the h/c package and tune the car. My dyno numbers are as follows with the stock throttle body and taylor wires.
uncorrected... 78.8 degrees corrected....
407.8hp/388.5tq..........413.3hp/393.7tq
A week later i added the Mti Polished Throttle body and Msd wires and here are my new numbers,,(also fixed a tps problem from the first dyno)
uncorrected....61.9 degrees corrected....
431.5hp/396.2 ...............404.3hp/371.3tq
the corrected power levels seem very low... anyone have any thoughts????
Patriot seemed very persausive that this kit made tons of power, but i dont see it.. or am i missing something .. or is some thing wrong..
i'll try to get the charts posted if i can get to a scanner. charts seem pretty smooth except for a very small amout on scribble past 6100, but its seems much more clear after the wire change and tps fix...Like i said just seems low after seeing cam only cars push 400-410. any thoughts would be appreciated.. thanks
I had a set of the same heads with a similar cam and put down only 408 at the wheels with a 6 speed. I was very happy with those numbers. The better flowing heads will help you in the long run if you ever decide to go FI or a stroker.
just my .02
just my .02
In case anyone was wondering the track numbers are as folows...
before h/c on nitto drags... 3k launch.. no powershift... 12.40@112mph...1.818/60ft.
After h/c...nitto drags...no powershift...3k launch.(car spins if any higher,waiting for ets and prostars)...made 3 passes, 1st pass was 12.2 after bogging car, 2nd was a 12.0 and 3rd was...11.992@118.82...1.871/60ft
before h/c on nitto drags... 3k launch.. no powershift... 12.40@112mph...1.818/60ft.
After h/c...nitto drags...no powershift...3k launch.(car spins if any higher,waiting for ets and prostars)...made 3 passes, 1st pass was 12.2 after bogging car, 2nd was a 12.0 and 3rd was...11.992@118.82...1.871/60ft
also should there be such a huge gap between my corrected and uncorrected dyno numbers.... went from 431 to 404 seems rather larger... mti suggests going on a warmer day for better corected numbers... not sure what that will do.. 431 would be great, but once corrected is where i am disapointed..
any ideas?
any ideas?
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Your doing fine. MY last m6 was a heads cam car. Close to the same MPH Mine was 119. With ETstreets it ran a 11.50@119 on motor. I'd worry more about that then the dyno. A dyno cant outrun you 
FWIW my dyno #'s were about the same 407RWHP one time and 417 another time.
FWIW my dyno #'s were about the same 407RWHP one time and 417 another time. LS1 Tech Stories
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I think those are good numbers thru a 12bolt with 4.10s. They alone are sucking up 10rwhp and some rwtq. Your trap speed of 118mph shows your making nice power and with some ET streets you have a mid - low 11 sec car. It's all bread and butter. Man I need a 12 bolt!!!!!!!!!
I'm thinking there is something wrong somewhere. What did MTI say about the numbers and the setup? They have loads of experience with H/C combo's, I'd listen to their opinion if they offered one. Btw, I ran a set of 5.3 heads which have lower compression than what you are running with a very similiar cam, 225/225 112 and dyno'd with the 10 bolt and then again after swapping over to the 12 bolt. I'm sure you aren't loosing more than 10 or 12 rwhp thru the 12 bolt. Here's a graph of the setup I was running, before and after the 12bolt.
450/420 with the 10 bolt and 441/412 with the 12 bolt
450/420 with the 10 bolt and 441/412 with the 12 bolt
Last edited by gomer; Dec 19, 2004 at 04:26 PM.
When i first installed my Stage 2 Patriots. I did everything I could, but could never break 402rwhp. Then I swapped to Cometic gaskets and removed the cats completely. Now making 422 rwhp/400rwtq with my 59 cc heads and C2 cam. Dyno #'s are nice but consistent times and spanking 460+ rwhp cobras on the highway is proof enough for me. 
gomer,
I would be very happy if i made that much rwhp.... is that corrected power?
Mti had no suggestions. Just stated that i should try to dyno it on a warmer day so the correction factor isnt so bad. Uncorrected i made plenty, but i lost 27 rwhp after corrected. Mti said i made good power for a h/c car. I disagree though. I think it may be in the tuning if thre is any power left to find. I do have confidence in mti's tuning, but they tuned it with a wire falling off anmd the tps falling off. The tech that installed the h/c seemed to forget to install them correctly. After the car got off the dyno, it would barely run. I fixed the wire and tps, but the tuning is still the same. Im not sure if it would change much if any, but that is my only guess.. other than that i guess this is all it will make.....
I would be very happy if i made that much rwhp.... is that corrected power?
Mti had no suggestions. Just stated that i should try to dyno it on a warmer day so the correction factor isnt so bad. Uncorrected i made plenty, but i lost 27 rwhp after corrected. Mti said i made good power for a h/c car. I disagree though. I think it may be in the tuning if thre is any power left to find. I do have confidence in mti's tuning, but they tuned it with a wire falling off anmd the tps falling off. The tech that installed the h/c seemed to forget to install them correctly. After the car got off the dyno, it would barely run. I fixed the wire and tps, but the tuning is still the same. Im not sure if it would change much if any, but that is my only guess.. other than that i guess this is all it will make.....
correction factoring still sucks. humidity will always be the part that will take forever to figure out. on my last dyno it rained. but the humidity read 23%?? correction factor was .96. basically taking 4 hp per 100hp away.
Thats a 7% correction. Its not due to temp though if it was 62*. Maybe someone can post for sure, but I know the SAE correction is based on their standard temp, baro and humidity which *I think* is close to 55* temp, 29.92 baro and 30% humidity. My guess is the humidity was sky high and the baro was way low on the day you dyno'd.
Regardless, with a normal weight SS trapping close to 119mph on drag radials is pretty good. When I had the TR224 cam and Patriot LS6 heads, mine trapped 118.6 at 3610# raceweight on ET Streets with a 1.6x 60' time. It dyno'd 415 rwhp/404 rwtq at the time.
Regardless, with a normal weight SS trapping close to 119mph on drag radials is pretty good. When I had the TR224 cam and Patriot LS6 heads, mine trapped 118.6 at 3610# raceweight on ET Streets with a 1.6x 60' time. It dyno'd 415 rwhp/404 rwtq at the time.
here's the actual SAE numbers straight off dynojet. In the United States this is usually Society of Automotive Engineers (SAF) standard J1349 Rev JUN90. Correcting to SAE J1349 alters the data to make it seem as if it was taken when the atmospheric pressure was 29.23 in/hg., the temperature 77°F and the humidity zero.
so, 62* is 15* under what SAE is. and then whatever the humidity was recorded at the time has to be corrected to 0%. and humidity is still where the correction problem is.
so, 62* is 15* under what SAE is. and then whatever the humidity was recorded at the time has to be corrected to 0%. and humidity is still where the correction problem is.
Phill2 just put stage 2 Patriots with extra porting and enlarged ex valve (done by Gunner I think) with a TR 224 on a 112 into an 04 GTO... has Stainless works headers and an SLP underdrive pully, and the MTI TB...he only made 375 SAE... I wish I had an answer. PS, tunedd professionally with HP Tuners
Originally Posted by gomer
I'm thinking there is something wrong somewhere. What did MTI say about the numbers and the setup? They have loads of experience with H/C combo's, I'd listen to their opinion if they offered one. Btw, I ran a set of 5.3 heads which have lower compression than what you are running with a very similiar cam, 225/225 112 and dyno'd with the 10 bolt and then again after swapping over to the 12 bolt. I'm sure you aren't loosing more than 10 or 12 rwhp thru the 12 bolt. Here's a graph of the setup I was running, before and after the 12bolt.
450/420 with the 10 bolt and 441/412 with the 12 bolt
450/420 with the 10 bolt and 441/412 with the 12 bolt