Where to Shift RPM wise at the track w/ my mods? DarkFire , anyone??

xtweakerx · Nov 18, 2008

Engine: 4.6L
GMS Driveshaft Loops
Hurst Line-Locks
5 Speed Transmission
Ford 4:10 Rear-end Gears
Brenspeed SCT2 Tune 93 Octane
Steeda Under Drive Pullies
C&L "Racer" Cold Air Intake
Steeda Upper & Lower Control Arms
M&H 275/50R17 Drag Radials
Pypes Off-Road H-Pipe
Flowmaster Axle-back Exhaust

I have been shifting at 6200. Lend me your thoughts.

Disappointed with my last time out at the track however it was god awful humidity 80% plus and temps 77&higher and also the first time back in the car racing in 6months at a new track plus i was testing out different tire pressures.

But i ran back to back 13.23 @ 104 w/ 1.90 and best of the night 1.87.

i plugged my values into Density Altitude calculator and it said 12.99 corrected whatever that means.. ; ) Hell im gonna go race this saturday should be great weather so ill try again, should i shift higher than 6200?

DarkFireGT · Nov 18, 2008

Redline for your tune should be set at 6800. I shift around 6400 and don't take my foot off the go pedal.

chad9350 · Nov 18, 2008

Where are you rpm wise when going through the traps?

Maybe try a little above or below 6200 on diff. gears... i wouldnt be surprised you find a tenth or two hiding under your nose!

FWIW... it'll be fun trying to find!!

DarkFireGT · Nov 18, 2008

Yeah, what gear are you going thru the traps at, and what RPM? With that gearing and tire size, you should be staying in 3rd and crossing just under redline.

kevanp · Nov 19, 2008

DarkFireGT said:
Redline for your tune should be set at 6800. I shift around 6400 and don't take my foot off the go pedal.

+1

I trap in 4th @5800 ish.

xtweakerx · Nov 19, 2008

kevanp said:
+1

I trap in 4th @5800 ish.

so u shift at 6400 as well?

At what RPM are u launching at?

kevanp · Nov 20, 2008

tweaker,

I'll power shift at 6200-6400.
I typically do 6200 on 1-2 and 2-3 and 6400 3-4.

I launch at 2500rpm on street tires and 5k on drag rubber

The 2 biggest things I had to work on to get sub 13sec times was traction at launch ( needed tires and front swaybar removed) and power shifting (took practice)

kevanp · Nov 20, 2008

DarkFireGT said:
Yeah, what gear are you going thru the traps at, and what RPM? With that gearing and tire size, you should be staying in 3rd and crossing just under redline.

I would doubt he traps in 3rd with 4.10s

DarkFireGT · Nov 20, 2008

kevanp said:
I would doubt he traps in 3rd with 4.10s

We had 4.10's and M&H's on our '05, along with intake, tune, off road pipe, etc... and we were trapping right around 6k in 3rd. It is possible. M&H's are tall tires. They bring the effect final drive ratio down to about 3.90.

xtweakerx · Nov 20, 2008

hey im going through the traps in 4th gear, i tried running 3rd gear out but i hit the rev limiter before i could make it , i tried it once because 4th gear is not long before the traps, but that was when i was shifting at 6200, so maybe shifting at 6400 will give me a bit more room to maybe make it in 3rd, i dont know its gonna be close though ; ) lol

wish me luck im going to go race saturday..

69mach1-409 · Nov 20, 2008

I have 3.55's and I'm just hitting the rev limiter (6500) in 3rd going through the traps.. are the DR's making that much of a difference that you can run 4.10's and still stay in 3rd?

xtweakerx · Nov 20, 2008

the height difference does make a difference i think its dropping the 4:10's down to 3.99-4.0's im not sure about all the way down to 3.90's that is a bit much.

From my experience I dont think I'll be able to run through the traps in 3rd because i tried it once already ; )

But i will say I don't believe i trap that high in 4th , but heck when i run this saturday ill take a look at my Tach to see what im trappin at, i got a GOOD Feeling about this Saturday as long as the weather holds up.

91frppgt · Nov 20, 2008

after my car got tuned, it never see's over 6200.

i believe its 6200 from 1st to 2nd, 6k 2nd to 3rd, 5,800 3rd to 4th, and converter locks up early.

my best mph is 108.54 with a auto, basic bolt ons and tune. on 20's as well.

i thought you 5 spd guys would be trapping higher?

kevanp · Nov 20, 2008

91frppgt said:
after my car got tuned, it never see's over 6200.

i believe its 6200 from 1st to 2nd, 6k 2nd to 3rd, 5,800 3rd to 4th, and converter locks up early.

my best mph is 108.54 with a auto, basic bolt ons and tune. on 20's as well.

i thought you 5 spd guys would be trapping higher?

I trap at a lower mph when I get hook and a good ET.

UrbanRedneck · Nov 22, 2008

I trap in 3rd gear at like 6500ish with stock 3.55s and stock tires... I have 4.10s waiting to go in, but I fear they may slow the car down at the track because I wil have to shift into 4th. It will be fun on the street though.

xtweakerx · Nov 23, 2008

urban, i have 4.10's and drag radials and i npw shift into 4th and im going faster now than previously.

SinCityVogel · Nov 23, 2008

I have 3.73 gears and i shift at 6000

fullboogie · Nov 28, 2008

If you look at the hp/tq curves on a dyno graph, you will be surprised to see where the peaks are. In my opinion, shifting at 6000 or above is way too high for a basically stock engine. Personally, I set my shift light for 5500 to shift in the 5700-5800 range (taking into account reaction time for the shift light). I think there's a misconception about how high these engines need to be shifted for max ET.

kevanp · Dec 3, 2008

fullboogie said:
If you look at the hp/tq curves on a dyno graph, you will be surprised to see where the peaks are. In my opinion, shifting at 6000 or above is way too high for a basically stock engine. Personally, I set my shift light for 5500 to shift in the 5700-5800 range (taking into account reaction time for the shift light). I think there's a misconception about how high these engines need to be shifted for max ET.

What kind of times are you getting @5500?
I would think shifting at 1000rpm would yield max ET.

ptfoxbdy89 · Dec 3, 2008

im in 3rd at about 6300 im runnin way faster than you are?? 106ish at 13.33?? i have a 3.55 in the rear though..

Where to Shift RPM wise at the track w/ my mods? DarkFire , anyone??

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