hae

i have a 08 z06, so long story short i bought the car from a friend of mine with a blown motor due to a bad tune it had a supercharge on a complete stock long block. so i rebuilt the bottom end and decided to do a n/a build. here is the list of modification:
diamond pistons
lunati rods
AHP ported heads no milling
btr stage 4 cam
american racing 1 7/8 headers and off road x
haltech cai
fast 65# injectors
stock intake and tb (at that time)

took the car to get tuned and it made 540whp/467tq on a mustang dyno. after a couple of months i installed a ported msd intake along with a ported stock tb and got it retuned by a deferent tuner and it made 576/514 on a dyne jet. i took it to the track after the intake and my best pass was 10.5@134. what do you guys think about the dyno# i have seen many cars making over 600 with the same cam so what would be holding my car. i raced h/c z06 (btr stage 3 cam with stock intake and tb) and we were head to head. any input will be appreciated

NemeZ

Don't know how much heavier that rod and piston combo is but I would think you would lose a few ponies from a heavier rotating assembly. Also losing quite a bit from the unmilled heads. Mill the heads and retune you should gain quite a bit.

American Heritage

You can have 10hp+ just in a tune.
Milling is good for another 5-15hp (depending on how much you mill).
Dyno vary greatly from dyno to dyno
a 102TB might bring in some additional air.
Your last 576rwhp # is not that far off.
You said its a new engine. Have you done a leak down test on it to see how the rings are sealing?

AzDave47

LS7's can dyno stock on a Dynojet from 425 to 475 rwhp, so dyno to dyno readings make it hard to compare numbers unless you do a before/after on the same dyno, which you couldn't do because of the failure. It is also tough to compare mustang dyno vs Dynojet.

A good measurement would be what are others turning for trap speed with your cam and same rear tires under similar weather conditions. Then different tracks/prep also make a difference.

Were you happy with the 10.5/134? If so, the dyno numbers don't matter

cseaman

AzDave covered it. No amount of mod combo discussion will you give you an answer if you don't have baselines from the same dyno. Comparing your trap to other similar cars would be more of an indicator of what is left on the plate, if anything.

yellowzron

Dyno numbers dont mean crap. They vary from machine to machine, from day to day. Go out and enjoy the car.

outhouse

576/514 on a dyne jet. not low

FNBADAZ06

Where are you located ? Keep in mind, if you're looking at SAE corrected dyno numbers (regardless of dyno used) and you're at a high altitude, you won't be able to even compare 1/4 trap speeds to other's that race a sea level with the same "number".

ET is more of your 60' and shifting/driving skills....... 134 trap seems right for a true 575-585 RWHP with 2000+ DA.

Travlee

mustang dyno's read about 10% lower than dynojets.

southspeed

134 seems about right to me. How tall is the rear tire you are using at the track? Are you running skinnies up front?

redc6z

Stock wheels up front and 27" tall rear c5 z06 wheels on 315/35 MT street r

redc6z

Florida and DA was about 700-800 when i ran 10.5@134

redc6z

Yea so probably with these upgrade i should be close to 600 mark and I didn't do a leak down test

redc6z

Thanks guys i guess my next upgrades would be 102tb, mill the heads .030, e85 or i might just spray it lool

08mojo

I agree with the others. 134 mph trap speed is showing the car is making good power.

redc6z

for some reason i couldn't post the thread in my username so i used my friend's account to post it

butch353

also how long an what did you do for a break in to seat the rings an bearings. remenber my dad using Bon-Ami to seat the rings in his race car if we didn,t have time to run it in the shop. OLD SCHOOL old. JD

phils C5 vette

Unless you were Florida Speed and Power ( FSP ) and their "stingy" mustang dyno was 10% higher than everyone's dynojet

redc6z

I had a new mcleod rxt clutch installed the same time so i broke it in for more than 300 miles

redbird555

Mustang dynos don't always read lower. It's very easy to manipulate. Someone just did a comparison between a DJ and MD same day and the difference was about 7whp at 530whp. My buddies HC ls1 car made 460 on a MD which was obviously happy for what he had.

With that said I feel the numbers are a tad low. Maybe I missed the part about your DA but at decent da a HCI Z should do a lot better than 134mph