97F1R408

iTrader: (2)

I have an 03 z06 that has lg long tubes 3'' x pipe with no cats , 3:90 gears,ausie clutch, 4" custom air intake,10.9 to one compression all forged,85 mm throttle body, 42lbs injectors, 224 224 cam with 581 lift but with 1.7 roller rockers, heads from precision porting that flow over 300cfm, it made only 390hp and 361tq to the wheels on a dynojet wtf?

SAM98WS6

bad head job (not as advertised)
tuning? A/F?
Dyno? SAE? Before numbers?
Valvetrain?

97F1R408

iTrader: (2)

heads looked good and were on a stock bottom end 6.0 liter with same cam and made 414rwhp in an auto with no roller rockers,no headers and it had cats, no air intake. the 18 cubic inch difference shouldnt be that drastic and it has alot more into it now. what would you think this setup should make?

BlueSix

Do you have a graph to post up?

97F1R408

iTrader: (2)

IT is still at the tuners but it was my mistake it was done on a mustang dyno but how big of a difference is there ? Ill see if they can fax me one.

SideStep

97F1R408

iTrader: (2)

I dont no whats so funny side step this car still has direct port which took it to 587rwhp,so your 450 doesnt add up to much and my 97 has a 408 with an f1r methanol injection and everything else starting it up would shut your car off

HectorLS1

iTrader: (6)

Tuned? Those 42lbs are way too big for that cam.

GotV-8

iTrader: (15)

It needs some tuning, should be doing at least 20 more to the wheels.

97F1R408

iTrader: (2)

they said best injectors would be 36lbs but I am spraying pretty heavy and want to be on the safe side

ddnspider

iTrader: (26)

The injectors arent going to make a difference unless they havent been tuned into the car,then youre going mega rich and risk washing down the cylinders if there is too much fuel.Anyways,it sounds like the car isnt tuned but it is on a mustang dyno which is,despite huge debate,GENERALLY going to read lower than a dynojet so youre prolli about 410 or so on a Dynojet,but you also have gears which take some power as well.Your cam isnt that big so i think with some tuning and on a dynojet itll get better,besides numbers arent what matters its how it runs down the 1320 that does,or a ride on the highway.Good luck

97F1R408

iTrader: (2)

Thanks, the problem is that it is at one of the biggest tuners in the country and they have already tuned it.I just dont see that beeing all it has.Does anyone know the difference in power on a dyno jet verses a mustang dyno?

ddnspider

iTrader: (26)

Dont even try opening up that can of worms....SO MANY threads have been about that.Some people see no difference at all and i believe 1 or 2 people saw 40rwhp difference.So youll just have to redyno.

97F1R408

iTrader: (2)

I understand. thanks for the input I am going to dyno right away elsewhere and then I will no for sure

02ZOh6

I don't think he was laughing at you. If you put your cursor over the smiley it means lurking or checking in on the thread. Take it easy guy.

SAM98WS6

Mustang dynos are about 10% lower than dynojets from the 2 times ive compared.

we need to see the graph. my buddies 02 Z06 made 365rwhp with just LG long tubes and air intake. You should make more. Did you dyno before and after on the same dyno?

97F1R408

iTrader: (2)

before the car was bone stock after all these mods including compression jump and injectors heads cam and everything listed the car would bearly run with factory tune so i dropped it off and told them to tune it and then dyno it. I probably would have made 150hp if they had dynoed it before tuning it does put down 96 rwhp for every 100 shot jump I have them go though

300bhp/ton

There may still be more too it. But if it was a Mustang dyno then add at least 20rwhp to give an equiverlent to what a Dynojet would have shown (although it wouldn't actually be any more powerful on a Dynojet, just a different number )

So that would be 410rwhp+ Dynojet ponies.

Also was it STD or SAE? As this can make a 5-12bhp difference quite easy.

If the 414rwhp from the previous 6.0 incarnation was STD on a Dynojet then it would be more like 385-390rwhp SAE on a Mustang Dyno. And if the auto was locked for the dyno run it would have been quite efficent also in terms of drivetrain loss, not far off a manual.

Ksett

You're losing 10 hp from the gears and reading ~20 hp lower on the Mustang dyno. So that, in theory would put you at ~420 hp on a dynojet with stock gears. The ~420 hp sounds about right with your budget heads and the size cam that you have. With AFR's or ETP's I think you would be 10-20 hp higher. JMO.