Engine / Performance Modifications

     Hi everyone. The car so far has made 322 horsepower and 369 ft/lb at the wheels. This is an increase of 111hp and 54 ft/lb over what the stock L98 put down when I originally got the car at 98.5k miles. Right now it has 183k miles on it. Calculating for drivetrain loss this is about 390hp & 445 ft/lb at the crank. The car still needs a lot of tuning done to it, so we should see some more. I just haven't had time to do it properly yet. I expect the peak torque to shoot up a good amount and perhaps to squeeze another peak 15-20rwhp out of it when the computer is squared away. The bottom and mid range power curves should both increase a good amount though. This is WITHOUT the Nitrous Express or MSD Ignition components you see listed below. When all of that stuff is brought into the mix I will probably be running the 100 or 125 shot. This should in theory add about 85-105hp and at least 130-150 more ft/lb at the wheels. Well, that is of course if the pistons hold up.
     In this configuration the car has gone a best of 12.89 @ 109.77 with some horrible 2.2 sixty foot times bogging out of the hole badly on street tires. STREE TIRES! WHAT! Yeah I know, what the hell! It should blow them away. Then again these Eagle F1 GS-D3s in the 315/35-17YR Z size really bite hard. In comparison when the car was stock it went 13.89 @ 98.17 with 1.9 second sixty foot times on Dunlop SP8000 Sport 255/50-16ZR street tires. Hopefully the ECM tuning will kill this dead spot and bring back the bottom end to see what she'll really do. The car is an animal in the second 1/8 of the track picking up about 25 MPH. To me that says that the bottom end definitely needs work though as it shouldn't be picking up THAT much I'd think. I also have a set of 3.33 and 3.45 gears that I'm considering putting in instead of the 3.07 gears currently in the Dana 44. I do have to say that on the highway it screams with the 3.07 gears. Accelerating from 75mph to 150mph only takes about 1/2 mile and then just screams to 168mph (Haven't tried going faster yet) where the stock L98 would take about 2 miles to reach 150mph and then getting to 154mph took forever.


Dyno Chart comparing Stock and Modified power outputs.
HP Peaks
Stock: 211 @ 4200
Modified: 322 @ 5200

Torque Peaks
Stock: 315 @ 3100
Modified: 369 @ 4300



Graph taken from above modified dyno pull. You can see here why I think there is a lot of low & mid power still to be had. She's running way rich! Taking a look back at the dyno pull chart above shows how both the HP and Torque curves suffer with the A/F mixture so rich. Take note of how they both have dips where the A/F does as well. When I'm done tuning I want to see this line as flat as possible across the 13.0 line.



Here is a before and after shot of my engine compartment.

Before.




After. Notice the MSD and Nitrous Express components were not yet installed. And I promise the brake master cylinder is full of clean fluid now! :)




  1. Lingenfelter/Accel Superram Plenum & Runners
  2. Lingenfelter/Accel Superram Intake Manifold
  3. Lingenfelter 74219 Camshaft

    4.      (219/219 Duration, .560"/.560" Lift w/1.6 Rockers, 112 LSA)
  4. Comp Cam Pro Magnum 1.6 Roller Rockers
  5. General Motors 4-Bolt Rollercam 350ci Engine Block
  6. General Motors 10088113 Aluminum Cylinder Heads

    7.      Ported & Polished
         Manley Pro-Flo 2.02" Intake Valves
         1.60" Exhaust Valves
         3-Angle Valve Job
         Lunati Double Valve Springs
         10* Degree Titanium Retainers
         Comp Cam 10* Valve Locks
         7/16" Rocker Studs
         Heat Treated Pushrods & Guide Plates
         Bronze Valve Guides & Recut Seats
  7. Clevite77 H-Series Main and Connecting Rod Bearings
  8. ARP Connecting Rod Bolts
  9. Cloyes True Double Roller Adjustable Timing Set
  10. Sealed Power Roller Lifters
  11. Scorp508 Custom ECM PROM
  12. 160* Thermostat
  13. Hooker 2149 Headers

    14.      (1.75" Primaries, 3" Collector)
  14. Hooker 16720 Front 3" Y-Pipe
  15. Flowmaster 1012 Rear 3" to 2.25" Y-Pipe
  16. Flowmaster Mufflers
  17. Main Cat 3" Test Pipe
  18. AIR Pump Delete Kit
  19. Crank Underdrive Pully
  20. Descreened MAF
  21. K&N Filter
  22. Open Air Filter Lid
  23. MSD Super Conductor 8.5mm Wires
  24. MSD Digital 6+ Ignition
  25. MSD HEI Ignition Coil
  26. MSD HEI Low Resistance Bushing
  27. MSD RPM Activated Window Switch
  28. Conrad Distributor Cap & Rotor w/Brass Terminals
  29. Wells Cheapo Ignition Control Module
  30. Holley Adjustable Fuel Pressure Regulator
  31. 24# Ford SVO Injetors
  32. All ARP Fasteners
  33. All Fel-Pro Gaskets
  34. Nitrous Express GM EFI Wet Kit 50-150 HP
  35. Nitrous Express Purge Valve
  36. Nitrous Express Bottle Heater
  37. Nitrous Express Fuel Pressure Switch
  38. Nitrous Express Nitrous Filter
  39. Nitrous Express Blowndown Tube & Valve
  40. Goodyear Eagle F1 GS-D3 Tires, 275/40-17YR Z & 315/35-17YR Z
  41. Denny's Driveshaft Nitrous Ready Steel Halfshafts
  42. Spicer Cold Forged Universal Joints
  43. Centerforce Dual Friction Clutch
  44. 4+3 Short Shifter Kit


Audio
To Date

  1. Pioneer DEH-P77DH CD Receiver

  2. Infinity Kappa 10.1t 3/4" Tweeters

  3. Infinity Kappa 65.1mb 6.5" Mid-Ranges

  4. Infinity Kappa 6"x9" 3-Way


Appearance / Exterior Modifications
  1. Locking Gas Cap

  2. Llyod's Floor Mats

  3. Llyod's Cargo Mat

  4. Hella Vision Plus Headlamp Housings

  5. APC Xenon Plasma H4 Bulbs

  6. 885 50W Fog Lamps

  7. Zaino Car Polish

  8. Front & Rear ABS Plastic Splash Guards

  9. AFS Wheels Grandsport Replica Rims, 9.5x17" & 11x17"