dyno dynamics accuracy?

[samplesurf]

today we had a dyno day using a dyno dynamics dyno and i dynoed 278hp which seems way off for my setup so im asking if dyno dynamics always read low which seem to be what im finding out, heres my setup:

s13 sr
2871r .86 at 18psi
hks step 1 264 cams
555 injectors
z32 maf
enthalpy tune
and all other bpu's

the thing is last year i dynoed 270whp with just a t28 and stock everything which is about right, so whats the deal with that, should i go back to the dyno i first used, i think it was a mustang dyno

[Wei240]

they read low supposedly,
like dynojet reads high,
some say to calculate crank, divide by 85% (drivetrain loss) for dynojet whereas dyno dynamics divide by 80%
i'm getting 260 from dyno dynamics, and i'm trying to get a dyno from dynojet just to see if the difference...

it's just me, but i'd run 740cc's with your setup, i don't know, i just don't like the idea of maxing the injector duty cycle when i know the turbo can handle so much more... (and a retune from enthalpy, which shouldn't be too much...)

[eastcoastS14]

could be your tuning...a good set up is nothing without a proper tune

[samplesurf]

my buddy has a program to read duty cycle via the consult port just havent used it yet just seems like the dyno is way off

[MomentumGT]

it's just me, but i'd run 740cc's with your setup, i don't know, i just don't like the idea of maxing the injector duty cycle when i know the turbo can handle so much more... (and a retune from enthalpy, which shouldn't be too much...)

Couldn't agree with you more. We're running the same setup on our track car (same as SampleSurf) minus the hks step 1 cams & enthalpy tune @ 16psi making close to 300whp and our 555cc injectors are @ 100% duty cycle.

-Jon

[forum04pl]

welcome to the world of dyno dynamics... its a heartbreaker.

get used to the unusually low numbers for high mods, my car made 419 on a dd, but made 465 on a dynojet. apples to oranges :)

[steve shadows]

Couldn't agree with you more. We're running the same setup on our track car (same as SampleSurf) minus the hks step 1 cams & enthalpy tune @ 16psi making close to 300whp and our 555cc injectors are @ 100% duty cycle.

-Jon

make sure your fuel pump is up to the task if your running higher fp to compensate for high duty cycles, which you should be doing

[samplesurf]

thanks for the replies guys i think im gonna go back to the dyno i first used next week to see exactly what an increase i got