600+hp gear ratio and RPM help - Ford Mustang Forum
 
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post #1 of 13 (permalink) Old 04-10-2016 Thread Starter
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600+hp gear ratio and RPM help

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==
fi 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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Last edited by TomasV; 04-10-2016 at 04:07 PM.
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post #2 of 13 (permalink) Old 04-10-2016
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What are your RPM's crossing the stripe and what gear are you in?

Are your shocks adjustables? May need to play with adjustment to get your 60' times down.

Are you getting enough fuel on top end? Are you getting a good amount of boost on top end?

Just some general questions

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post #3 of 13 (permalink) Old 04-11-2016 Thread Starter
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Quote:
Originally Posted by stang93mustang View Post
What are your RPM's crossing the stripe and what gear are you in?

Are your shocks adjustables? May need to play with adjustment to get your 60' times down.

Are you getting enough fuel on top end? Are you getting a good amount of boost on top end?

Just some general questions
- What are your RPM's crossing the stripe and what gear are you in?
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?

- Are your shocks adjustables? May need to play with adjustment to get your 60' times down.
yes, they are.
Strange Externally Adjustable Mustang Struts S6009LM
Strange Externally Adjustable Mustang Shocks S6008LM

I had them first time this Saturday.
They both have 10 performance-adjusting rebound settings - and I had both (front and rear) on 5
Iv changed the tire preasure and launch RPM to get a best result, not the shocks this time.
Do you have recomendation, how to set them?

- Are you getting enough fuel on top end?
I dont have datalog so I nan judge by Dyno test only.
I had this problem last year, but now I have new MMR fuel rails, Ford Racing dual fuel pump and Kenne Bell Boost-a-pump - and everythong seems ok on dyno

- Are you getting a good amount of boost on top end?
as I wrote, I dont have datalog so I can judge by Dyno test only.
24psi peak

- Just some general questions
thank you VERY much for your reaction, I am grateful for any advices.
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post #4 of 13 (permalink) Old 04-11-2016
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Am I misreading the dyno sheet? It says 444 engine HP?

With 810 torque??

Sorry.

'07 Mustang GT Premium
FRPP camshafts, C&L Racer, AED dyno tune, 4.10s, BBK tuned shorties, MAC Pro Chamber, SVE axlebacks, SR springs, Eibach struts and dampers, Subframe connectors, Eibach front and rear sway bars, BMR Adjustable panhard, J&M AUCA & LCA, Camber plates, CMDP, BBK UDPs, Exedy LW flywheel and stage 2 clutch, Hurst short throw shifter, SS brake lines, Window louvers, CDC Shaker scoop, custom hood paint and rear decklid paint. S197 Mach 1 replica?
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post #5 of 13 (permalink) Old 04-11-2016
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I saw that too
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post #6 of 13 (permalink) Old 04-11-2016
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Good starting point for the rear. If the car is spinning right off the line loosen by 1 click in the rears. Front starting point should be at 2 or 3 for a starting point. You want them as loose ass possible but not too loose.

http://www.strangeengineering.net/we...le-drag-shocks

RPM's need to be higher crossing the stripe.....sounds to me like you are short shifting. Let them build up and shift quick.

Do you have any video.....maybe I could try and help more. Very hard at this point w I thought being there.
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post #7 of 13 (permalink) Old 04-11-2016 Thread Starter
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Quote:
Originally Posted by Kaantu View Post
Am I misreading the dyno sheet? It says 444 engine HP?

With 810 torque??

Sorry.
444 kw (kilowatt) = 603 HP

yes, 810 Nm torque
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post #8 of 13 (permalink) Old 04-11-2016 Thread Starter
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Quote:
Originally Posted by stang93mustang View Post
Good starting point for the rear. If the car is spinning right off the line loosen by 1 click in the rears. Front starting point should be at 2 or 3 for a starting point. You want them as loose ass possible but not too loose.

Mustang Adjustable Drag Shocks | Strange Engineering

RPM's need to be higher crossing the stripe.....sounds to me like you are short shifting. Let them build up and shift quick.

Do you have any video.....maybe I could try and help more. Very hard at this point w I thought being there.
ad shocks - great, thank you very much!

"..Let them build up and shift quick..."
what do you mean? (I am sorry about my english..)
Do you mean that I should stert to learn, how to shift without the clutch (power shifting?)
https://en.wikipedia.org/wiki/Powershifting

ad video:
only thost two from Saturday, sorry about the quality:
https://www.youtube.com/watch?v=s9mtSY7KYyI
https://www.youtube.com/watch?v=JyBRNFhw-cs
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post #9 of 13 (permalink) Old 04-12-2016
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No, no, no.......you need to use the clutch or you will tear something up like QUICK! Lol

Shift where your gas pedal does not come off the floor while shifting.
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Quote:
Originally Posted by TomasV View Post
444 kw (kilowatt) = 603 HP

yes, 810 Nm torque
Holy. Okay yea, it would help if I read the top of the dyno sheet.

I also forget that the rest of the world doesn't use HP and ft-lb like us 'mercans do.

Kilowatts.

WHOOPS.

'07 Mustang GT Premium
FRPP camshafts, C&L Racer, AED dyno tune, 4.10s, BBK tuned shorties, MAC Pro Chamber, SVE axlebacks, SR springs, Eibach struts and dampers, Subframe connectors, Eibach front and rear sway bars, BMR Adjustable panhard, J&M AUCA & LCA, Camber plates, CMDP, BBK UDPs, Exedy LW flywheel and stage 2 clutch, Hurst short throw shifter, SS brake lines, Window louvers, CDC Shaker scoop, custom hood paint and rear decklid paint. S197 Mach 1 replica?
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post #11 of 13 (permalink) Old 04-12-2016 Thread Starter
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Quote:
Originally Posted by stang93mustang View Post
No, no, no.......you need to use the clutch or you will tear something up like QUICK! Lol

Shift where your gas pedal does not come off the floor while shifting.
got it :-)
ok, thanks - will try my best.
(is there any manual on instructions, how to do it right on the web? or its just simple "keep the foot on the floor" trick?)
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It takes practice. 1-2 and 3-4 shifts are kind of easy.....it's the 2-3 shift that is hard.

Gotta be quick and make sure your not going from 2nd to 5th.
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post #13 of 13 (permalink) Old 04-12-2016 Thread Starter
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Quote:
Originally Posted by stang93mustang View Post
It takes practice. 1-2 and 3-4 shifts are kind of easy.....it's the 2-3 shift that is hard.

Gotta be quick and make sure your not going from 2nd to 5th.
thank you :-) will go practicing then, before next competition
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