View Full Version : Desk Top Dyno


SCHOON
Mar 10th, 06, 12:41 PM
IF SOMEONE WITH THE SOFTWARE COULD DO A RUN FOR ME I WOULD REALLY APPRECIATE IT.

ZZ4 385FB CRATE ENGINE = OUT OF THE BOX WITH 385HP
COMPRESSION= 9.6:1
ALUM FAST BURN HEADS 62cc VAL DIA INTAKE=2.00 EXHAUST=1.55
ADDED
HOLLEY 700CFM DP
1 5/8 THORLEY HEADERS WITH FLOWMASTER CROSSFLOW EXHAUST
MSD6A
MARCH PULLIES
CRANE GOLD RACE ROCKERS 1:5
COM CAM = CS XR276HR-10 DURATION=224, 230 LIFT= .502 .510
Thanks in advance
Schoon

sc68z28
Mar 10th, 06, 08:01 PM
Hey SCHOON; are you saying it would have a 9.6:1 with the fast burn heads?
If so, and not knowing head flow #'s. With the other specs you gave and I assumed a basic dual plane intake, with head flow @ .500 of 253 I/ 174 E.
My program says 372 HP @5500 / 406 TQ @4000.

loneagle
Mar 10th, 06, 08:52 PM
That combo should make well over 400 hp!
Go to the link and you can download the Performance trends EA dyno program for a week free. It's a much better dyno compared to the DD2000.
http://www.performancetrends.com/download.htm#eapro

SCHOON
Mar 11th, 06, 05:38 AM
Yes 9.6:1 with the Vortex fast burn heads
Performance parts dual plane intake, with head flow @ .500 of 253 I(maybe)?
Engine came rated 385HP@5600 RPMS, TQ=385@4000RPM
I can't find any info on the heads flow rate.

onovakind67
Mar 11th, 06, 06:10 AM
Here you go...


RPM···········2000····2500····3000····3500····4000 ····4500····5000····5500····6000····6500
Brake_Tq······283·····305·····336·····347·····357· ····375·····371·····351·····320·····274
Brake_HP······108·····145·····192·····231·····272· ····321·····354·····367·····366·····339
Exh_Pres······.1······.2······.3······.5······.7·· ····.9······1.2·····1.3·····1.5·····1.7
Int_Vacuum····.3······.6······.6······.6······.6·· ····.6······.7······.9······1.0·····1.1
Vol_Eff_%·····70.3····74.7····80.3····84.4····88.3 ····93.3····95.1····94.1····91.9····88.4
Actual_CFM····153·····204·····262·····322·····385· ····458·····518·····564·····601·····626
Fuel_Flow·····56.0····74.4····95.9····118·····141· ····167·····189·····206·····219·····229
A/F_Mix_Qal···100.0···100.0···100.0···100.0···100.0· ··100.0···100.0···100.0···100.0···100.0
BSFC··········.520····.512····.500····.509····.517 ····.520····.536····.562····.599····.676
BSAC··········6.517···6.416···6.270···6.384···6.48 1···6.524···6.718···7.045···7.518···8.476
Friction_HP···20······29······39······52······66·· ····84······105·····130·····158·····191
Mach_#········.153····.191····.229····.267····.306 ····.344····.382····.420····.459····.497
Piston_Spd····1160····1450····1740····2030····2320 ····2610····2900····3190····3480····3770
Piston_Gs·····258·····403·····581·····790·····1032 ····1306····1613····1952····2323····2726
Overlap_%VE···-3.1····-2.6····-1.4····-1.5····-1.2····.9······1.5·····.5······-.7·····-.9
Int_AvgVel····100·····125·····150·····176·····201· ····226·····251·····276·····301·····326
In_InertiaPrs·.1······.5······1.0·····1.5·····1.9· ····2.3·····2.4·····2.4·····2.3·····2.1
In_ResTunPrs··0.0·····0.0·····.0······.0······.0·· ····.0······0.0·····0.0·····0.0·····0.0
Ex_AvgVel·····114·····142·····170·····199·····227· ····256·····284·····312·····341·····369
ExTun_Prs·····.7······.7······-.1·····0.0·····-.3·····-1.3····-1.7····-1.8····-1.4····-1.2
Lifter_Pump_UpNone····None····None····None····None ····None····None····None····None····Some
Spark_Adv·····27······29······30······31······32·· ····32······33······34······34······35

A quote from one of the Vette forums:

The motor in my car is a new (~1,500 miles) GM Fast Burn 385 with the optional Hot Cam. The transmission is a fresh TH-700R4 from Bow Tie Overdrives. When the new motor and trans went in, the differential was replaced with a new 3.70:1 gear. The induction is a Holley Street Avenger 670 cfm carburetor. The exhaust starts with Hooker Super Comp headers and goes through 2.5" dual pipes to Flowmaster 50s.

The results: 212.9 hp @ 5,600 rpm, 233 ft-lbs torque @ 3,450 rpm.

http://forums.corvetteforum.com/showthread.php?t=398965

SCHOON
Mar 11th, 06, 06:58 AM
Thanks for the info.
Can you tell me how to covert this into flywheel hp

onovakind67
Mar 11th, 06, 07:14 AM
The chart is estimated flywheel horsepower, with accessories installed, headers, mufflers, stock oil pan, Performer RPM manifold, 750 carb, XR276HR cam installed at 106°ICL, 1.5 rockers.
To estimate the flywheel hp from a 3-400 hp dyno test I would divide the rwhp by .8 for an automatic tranny, .85 for a manual tranny. This would get 266 fwhp derived from the chassis dyno. If your motor performs like the simulated one, you should be able to get about 294 rwhp out of it with an auto, 312 with a manual.

loneagle
Mar 11th, 06, 09:37 AM
Here's a dyno from the Comp site using World SR heads making 373 hp:
http://www.compcams.com/Technical/DynoSheets/XR276HR-10_001.asp