600+hp Gear Ratio And Rpm Help

TomasV

Member
Apr 10, 2016
11
5
13
hello guys,

I am newbie here, so maybe Ill ask some dumb already 100x asked questions - but Iv checked the forums and cant find my answers...
Also please excuse my bad english.

Almost 3 years I am buliding my Mustang 2005, bellow please find very short list of main changes and modifications.
Now i am on 600hp and 810Tq and best 1/4time 11.9 - and I am stuck there...
I think I should have a beter time, but I am not sure.

My main actual question is about gear ratio, tire preasure, shift point and launch RPM.

(My final goal is 1/4 time 10.xx, but its a long way, I know.)
(I still think that I should get more HP from this engine, but I am stuck there aswell)

Ill be glad for any advices, thank you in advance!



**** E N G I N E ****

5.0L MODULAR STROKER SHORTBLOCK M-6009-A46X
1.9L TVS VMP Supercharger
66mm Supercharger Pulley
STOCK 3V HEADS (from 2005 4,6 V8 engine)
FORD RACING HOT ROD PERFORMANCE CAMSHAFTS
Manley 3V HP Valvev springs
FORD RACING 47 LB/HR FUEL INJECTOR SET
FORD RACING Throttle Body OEM 60mm GT500 2007-2014
FORD RACING HIGH PERFORMANCE DUAL FUEL PUMP KIT (05-09 GT)
AFCO PRO-SERIES HEAT EXCHANGER W/ FANS (07-12 GT500)
Kooks Headers Long Tube Headers + Kooks Headers X-Pipes (no cat)
Kenne Bell Boost-A-Pump
Kenne Bell Boost-A-Spark
MSD Launch Control

*** DRIVETRAIN ***

STEEDA TRI-AX SHORT SHIFTER - TR-3650 (05-10 GT)¨
McLeod RST Street Twin Clutch Kits 6912-03
McLeod Aluminum Flywheels 563408
FORD RACING 4.10 GEARS (05-09 GT)

*** SUSPENSION ***

BMR Control Arms, controls, relocation, sway bar, K-member
stock springs
Strange Externally Adjustable Mustang Shocks
Air Lift 1000 Load Assist Rear Spring Kits

*** WHEELS ***

15" Weld Racing Draglite Polished Wheels 90-510354
315/60-15 Mickey Thompson ET Street Radial Tires 3763R


Dyno tested 600 RWHP, 810 troque
Shift point 6000 RPM (limeter 7000 RPM)
Launch RPM 2800
Tire preasure 8 psi

If you check my time slips, yesterday Iv started on 12,4sec and ended on 11.915 sec (1.815 6oft)
(we changed only launch RPM and tire preasure during the day)
but my max speed is still almost exactly 195 km/h - and I dont know why.
I cant improve my 1/4mile time anymore.

I have few questions:

==1==
with 600hp and 810Tq, should I still go with 4.1 gear ratio?

==2==
I think that 2800 launch RPM is far too low - but with this tires tire preasure I cant go higher
any advice?

==3==
generally, I would like to ask you for any advices, how to improve my 1/4 time with this car configuration, or what changes are you recomending.

==4==
if you check the dyna graph, what shift RPM can you recomend?

...and:
I am doing something wrong - or I simply cant go faster with 600hp?

Thank you very much for your help!

Tomas
 

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What RPM are you crossing the traps at? You've got to be at the top of the tach making that much power, with those rear gears?

If it were me, I'd be gearing the other direction. You're making a massive amount of torque....you should be making it work for you. I'd starting looking into the 3.31-3.55 range.

There's no reason you shouldn't be running at least mid-10's@130mph with that much jam on tap.
 
600HP you should be going much faster then 11.9. What's the MPH?

121 mph
As you can see on the time slips, I had with 12.4 sec and with 11.9 sec EXACTLY the same speed (195 kph, i.e. 121 mph) – and I dont know why.

thank you for any advices
 
- What RPM are you crossing the traps at? You've got to be at the top of the tach making that much power, with those rear gears?

only 4500-5000 RPM, 4th gear
as you can see on the dyno chart, engine is tested up to 6500 RPM (limeter is set on 7000 RPM)
HP still going up, peak on 6500, torque peak is on 4500 RPM
my shift light is se on 6000 RPM
do I am shifting too late? or do I have wong gears?

- If it were me, I'd be gearing the other direction. You're making a massive amount of torque....you should be making it work for you. I'd starting looking into the 3.31-3.55 range.
interesting, thank you

- There's no reason you shouldn't be running at least mid-10's@130mph with that much jam on tap.
I must doing something wong...