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Old 03-06-2008, 12:20 AM   #1
pelotonracer2
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Performance numbers for my SVT (see inside)

I finally got around to doing some secondary road tests to quantify the modifications that I recently completed on my car. As promised, here are the results.

I'm using a Stalker Pro radar gun w/STATS data aquisition to compile these performance numbers. This is the same equipment every major magazine uses to compile their testing data (Road & Track, Motor Trend, Automobile etc). I use this equipment daily in my line of work (and no, I'm not a cop!). I did approximately 10 runs, threw out the best and worst runs and averaged the remaining 8 runs for consistancy purposes.

The first test I did was back in late October. Weather was as follows: partly sunny, 61 degrees, relative humidity 44%, barometric pressure 30.01 and steady, wind out of the ssw @ 10-12 mph.

My car then had 28,200 miles on the odometer. Only mods were K&N in the stock box, modified ASF22C copper sparkplugs with shortened ground electrode modification and then indexed, MSD coil, 8.5mm wires and 18x7" OZ Ulteggera wheels with 215/40-18s. Tire pressure set to 40 psi. 1/2 tank of Shell V-Power (93 octane) premium gasoline. Spare and jack removed.

Second test was completed last week in similiar weather conditions on the same private road.

Modifications are as follows: Custom SRI with custom sealed box, breathing air from hood vent, modified 67mm throttlebody, port matched intake manifold inlet, heat shields removed, CFM high flow cat, 3" custom mandrel bent exhaust system, custom mufflers and dual exhaust outlets, 3" flexpipe, FRRP short shifter, modified ASF22C copper plugs indexed, brown wire cut to clutch actuation sensor, Braille lightweight battery, counter weight removed, custom tune by Tom, CFM "street" lower engine mount, full Eibach Pro suspension kit (springs and shocks + alignment), 215/35-18 tires. Approximately 140 pounds removed.



Data A: Basically stock:

0-10 mph: 0.61 seconds
0-20 mph: 1.54 seconds
0-30 mph: 2.46 seconds
0-40 mph: 3.78 seconds
0-50 mph: 5.21 seconds
0-60 mph: 7.07 seconds
0-70 mph: 8.84 seconds
0-80 mph: 11.73 seconds
0-90 mph: 14.22 seconds
0-100 mph: 18.47 seconds
0-110 mph: 21.96 seconds

1/4 mile acceleration: 15.72 @ 90.8 mph

Data B: Modified

0-10 mph: 0.53 seconds
0-20 mph: 1.48 seconds
0-30 mph: 2.33 seconds
0-40 mph: 3.48 seconds
0-50 mph: 4.76 seconds
0-60 mph: 6.17 seconds
0-70 mph: 8.21 seconds
0-80 mph: 10.54 seconds
0-90 mph: 13.28 seconds
0-100 mph: 16.97 seconds
0-110 mph: 20.71 seconds

1/4 mile acceleration: 14.82 @ 94.5 mph

Not too bad for a light N/A build, and full interior. The last modification I did was Toms tune and it worked beautifully on my car. Launching is so much easier. Best launches were done in the 2,500-2,800 range (in modded form). I can't remember how I was launching during the first test, but there were some bogging issues back then with the stock tune.

Soon this spring I will start an aggressive weight reduction program. My goal is to remove 400-500 pounds (I'm going much much further than just gutting the interior). When it is completed, I will do a retest.


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Old 03-06-2008, 12:28 AM   #2
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very good numbers with those mods, congrats!
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Old 03-06-2008, 12:28 AM   #3
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Impressive work for N/A
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Old 03-06-2008, 08:55 AM   #4
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Nice, hey could you put up pics of your SRI, and Which heat shield did you remove
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Old 03-06-2008, 05:20 PM   #5
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Quote:
Originally Posted by svtalex View Post
Nice, hey could you put up pics of your SRI, and Which heat shield did you remove
I removed the header heat shield and cat heat shield. I may end up cutting the stock heavy bracket out since I'll never use the stock cat again.

There are more pics of my SRI posted somewhere on this forum, minus the box. I've added one below but it doesn't show the box that the filter sits in. The hood is vented and as you can see it is functional. I'll take some more pictures after all this SNOW goes away...
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Old 03-08-2008, 10:42 AM   #6
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Quote:
Originally Posted by pelotonracer2 View Post
I removed the header heat shield and cat heat shield. I may end up cutting the stock heavy bracket out since I'll never use the stock cat again.

There are more pics of my SRI posted somewhere on this forum, minus the box. I've added one below but it doesn't show the box that the filter sits in. The hood is vented and as you can see it is functional. I'll take some more pictures after all this SNOW goes away...
Do you have the airbox sealed up against the hood for that driverside vent? If so, you'll want to turn the vent around. At speed, the vacuum on the hood will want to pull air out of the vents, and the intake will be fighting it to pull air in.
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Old 03-08-2008, 12:00 PM   #7
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Originally Posted by CaysE View Post
Do you have the airbox sealed up against the hood for that driverside vent? If so, you'll want to turn the vent around. At speed, the vacuum on the hood will want to pull air out of the vents, and the intake will be fighting it to pull air in.


It's not a perfect seal like a ram-air should be, so there shouldn't be a vacuum situation. There are small pressure relief holes at the bottom rear part of the box so there is no chance of the incoming air competing with outgoing air. Also, the vents actually do get some cowl induction benefit being so far up on the hood (I've tested this already... air is definatelty only going in, not out). Besides that, the filter actually sits only 2mm from the vent so it pulls in plenty of air. Needless to say it is *VERY* effective. Soon though I will be going to a completely sealed box with a ram-air scoop. The vents will just let hot air out on both sides then. Also, the direction of the vents wouldn't make much difference anyways as only the front one has any frontal area to actually pick up air.
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Old 03-06-2008, 09:14 AM   #8
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Nice job on the NA. Howd you mount up the Braille battery? Must be nice to access to radar gun/data acquisition tools. Look forward to updates with the future weight reductions.
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Old 03-06-2008, 05:25 PM   #9
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Nice job on the NA. Howd you mount up the Braille battery? Must be nice to access to radar gun/data acquisition tools. Look forward to updates with the future weight reductions.
Thanks. Mounting the battery was really easy. I got a small block of wood and wedged it between the tray and the battery (since the battery is smaller than stock size). I then removed the bolt on the strap and drilled a new hole in the strap to take the slack out. Works like a charm!
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Old 03-06-2008, 09:27 AM   #10
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"brown wire cut to clutch actuation sensor" what does this do?
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