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I've pretty much changed all of the factors but elevation and the traps remain consistently low. Diff temps, tires, tire pressures, a little weight. I'm assuming nobody can pinpoint my problem....  My friend's 98GTi VR6 would consistently trap 90mph, right next to me to boot. Those trap around 90-91 stock also IIRC, and he is slightly modded also.... 
99 SVTC, T-Red, #652/2760-12.8.1998
Mother#@%@!* did I sound abstract?
I hope it sounded more confusin than that!
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are the times coming down? Originally posted by JonnySVT:
I've pretty much changed all of the factors but elevation and the traps remain consistently low. Diff temps, tires, tire pressures, a little weight. I'm assuming nobody can pinpoint my problem.... My friend's 98GTi VR6 would consistently trap 90mph, right next to me to boot. Those trap around 90-91 stock also IIRC, and he is slightly modded also....
Ryan
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Yes, the times are coming down, I've only been twice afterall (less than 10 runs total). But my trap is always in the 87-88 range despite the difference between a 15.3 and a 15.8. The main killer is my 60ft for the ETs, but it was getting better.
99 SVTC, T-Red, #652/2760-12.8.1998
Mother#@%@!* did I sound abstract?
I hope it sounded more confusin than that!
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Joined: Mar 2002
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New CEG\'er
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Things that slow down vehicles or speed them up...
Density altitude is a major factor. This is the relative condition of the weather at the time of the run. This is gathered from temp, elevation, barometric psi and humidity. This is how you can correct your times to see if you really are making or losing rwhp.
About hp to weight....great for those that do not race nor understand power under the curve. Take my Lightning, makes 401/487 SAE @ the wheels, weighs 4800 lbs. Truck last time out ran 108.4 mph in the 1/4, as fast as 108.59 mph. This is with a DA of 1500' also. Give me a cool day, mucho baro and little humidity, I should hit 110-111 mph.
General rule of thumb...under 5250, rwtq is moving you, over it, rwhp comes in play. My Lightning shifts at 5000 rpm, makes 475 rwtq @ 3000 rpm, 487 @ 4000 rpm and it slowly drops off. How does your hp to weight ratio deal with such torque that never stops?
Tires...well, tires and rims. More mass = less speed.
There are a number of things that have an effect on mph and et. Those are the big ones.
Biggest one of all.....driver.
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Everything stated above + wind resistance plays a big role in trap speeds. This is in regards to RTstabler's comment about his traps versus Demons. The lightnings have more power but they are like a refrigerator above 100mph.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black
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Originally posted by CANTONRACER:
About hp to weight....great for those that do not race nor understand power under the curve. Take my Lightning, makes 401/487 SAE @ the wheels, weighs 4800 lbs. Truck last time out ran 108.4 mph in the 1/4, as fast as 108.59 mph. This is with a DA of 1500' also. Give me a cool day, mucho baro and little humidity, I should hit 110-111 mph.
Just thought I would follow up...on a nice day the truck ran a 12.61@111.3 mph just like I figured it would.
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what mods do you have? Just a #4 lower and intake and chip?
Ryan
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A complete breakdown of my truck.
4lb lower metco
MAC cai
SCT custom tune
FTVB & 4X4 tran pan
2 bottles of Water Wetter in inter cooler res
2 bottles of Water Wetter in the cooling res
170 thermo
Mobil 1 0W-20 synthetic oil
2 spal 7" fans on the heat exchanger
removed hitch/spare/jack
I weigh 200 lbs.
Truck runs pretty good for what I have done so far.
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98 svt sil/blu 3.0 oval heads full P&P, msds headers,bat kit,2,1/2exhaust 30 inch glasspack and 2 spintech mufflers 14.78@94mph
with my mechanical arm i can shift gears in less then a twentieth of a second for sale $7000
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Originally posted by JonnySVT:
Yes, the times are coming down, I've only been twice afterall (less than 10 runs total). But my trap is always in the 87-88 range despite the difference between a 15.3 and a 15.8. The main killer is my 60ft for the ETs, but it was getting better.
Do you have large diameter heavy aftermarket alloys or are you using the standard SVT wheels? Checked the tyre pressures etc? Perhaps the track is slightly uphill, and a run on another track would be a good comparision. At least it would rule out track conditions, and you know its either how your launching, or how your car is running. 
1996 Mondeo 24v 4-door
twin janspeed stainless pipe
cat by-pass
Phase 2 RS bodykit
16" cosworth alloys
K&N RU3530
SVT TB/UIM/LIM
poly bushings
konis/bat springs/bar
Pioneer
MSDS
Indiglos
P&P heads
2005 Mondeo Zetec Tdci
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