PowerTunePlus
turbo engine tuning secrets -
featuring original research

By Josh Straub, 2009
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Syclone

Key Ingredients to a Fast Truck

Syclone Modification Stages

Stage 1:
How to Get a Stock Truck Deep in the 13's



Tuner's Guide to DataMaster

FEATURED ARTICLE:
Real World Tuning Example:
Vortec/PT67GTQ Syclone on C16


Performance Roadmap: Syclone 4.3L Turbo V6

3 Bar Chip Tunes for Download

My 1991 Syclone

11.45 @ 117 Budget Build Spreadsheet

Vortec Heads Budget Spreadsheet

Racing Videos


Turbo Grand Prix

My 1990 TGP


Computing

Unfreezing Frozen Windows Applications

1991 GMC Syclone #0044


rounding Turn 7 at Road America in 2004, photo credit: Jim McIllvaine/Popular Hot Rodding 2005

Performance Statistics Video / Timeslip
Best Combos, Best Times
Date Combo RPM Boost Fuel 1/8 Mile 1/4 Mile
2007/11/10 Stock Bottom End, PT51 Turbo,
DIY Vortec Heads & 218* Cam
5400 20 PSI 93 Octane
w/alcohol
7.30 @ 95.18 11.45 @ 117.70
2003/11/15 Stock Motor (Stock Heads/Cam)
PT51 Turbo
4700 24 PSI 93 Octane
w/alcohol
7.53 @ 93.15 11.79 @ 114.18
2003/10/15 Stock Motor, Stock Turbo 4650 21 PSI 93 Octane
w/alcohol
7.76 @ 88.49 12.26 @ 108.66


Fastest run as of November 10th, 2007:
  • Full street trim, full accessories (A/C), full weight (3650# with driver)
  • 11.45 @ 117.7 MPH on 17-21 PSI with a single true street/strip tune, on 93 octane pump gas with dual nozzle alcohol injection (100% methanol), 5400 RPM shifts, 11.6-12.3 AFR
  • All season radial tires
  • Budget D.I.Y. build
  • Estimated 550 HP, 650 LB-FT torque



Compare my engine (above) to this photo of a 100% "Showroom Stock" Syclone engine!



Stock Parts
  • 1994 Factory 2-bolt stock (cast) bottom end 4.3L V6 motor, 64,000mi (78,000mi on chassis)
  • Stock intercooler (Garrett air to water, DIY ported inlet, factory original pump hotwired)
  • Stock intake manifolds (DIY ported lower to match Vortecs), stock twin 48mm throttle body
  • Stock cast iron exhaust manifolds, DIY ported
  • Stock ECM, patched for Wideband O2 datalogging, realtime chip editing
  • Stock 16" Wheels

Modifications
  • DIY 2001 cast iron Vortec #113 cylinder heads, lightly DIY ported, 227cfm/165cfm Intake/Exhaust, GM LS2 beehive valve springs, 2001 factory 1.5 roller rockers
  • Custom 218/218 .530" 115 LSA Comp Cams XFI camshaft, shifting at 5400 RPM
  • Precision Turbo "PT51" 57mm turbo (maxxed out at 20 PSI on this combo), bought & installed new Nov. 2003
  • Precision Turbo 3" stainless downpipe, ATR 3" stainless catback exhaust
  • SMC Enterprises "Round Tank" dual nozzle Alcohol Injection kit (100% methanol), lets me keep the boost at 20+PSI full time
  • 50# Delphi Fuel Injectors
  • DIY realtime chip tune via laptop w/Moates Ostrich emulator, TunerPro, wideband O2 datalogging into TTS DataMaster
  • Max-effort 1985 700-R4 overdrive transmission w/5 pinion GM planetaries front & rear, custom 4340 steel 4WD output shaft, heat treated/reinforced input shaft/drum, 4th gear Super Servo, etc..
  • Custom ~2700 RPM stall Yank billet 6-lug "PY3400E" lockup torque converter
  • CBR 12" LS1 PBR dual piston front brake upgrade





Here's the DataMaster file for the 11.45 @ 117.7 run:

The boost actually reads as low as 15.8 PSI and it still ran 11.45! I believe the fluctuating boost control is due to reaching the efficient flow limit of the PT51. Also notice the 100% Flat Line 0.0 Knock! :-) That is One Happy Machine on 93 octane/alky!


Download my DataMaster file
(the run got cut off just as I was going through the traps).



Old 11.79 Stock Converter Combo YouTube Video (low quality)
The fastest I went on the stock longblock (stock heads & cam) was on November 15th, 2003, my first trip to the track the week after I installed the PT51 Turbo/Downpipe:

60': 1.751
1/8: 7.538 @ 93.15
1/4: 11.795 @ 114.18 on pure 93 octane pump gas (with alcohol injection) at 23-24 PSI, Max RPM: 4700

Here's the DataMaster file for that run:

Notice the extra long brake-torque, and the stock converter "stuck" at 2325 RPM until the boost really comes online.


Download my DataMaster file
.

  • Factory original torque converter (~2200 RPM) and 700-R4 transmission (never rebuilt)
  • Off the shelf V7 Ultimate chip, T3-24 (Download it off the chips page)
  • Stock 28# Fuel Injectors, 42 PSI base fuel pressure
  • SMC Enterprises "Round Tank" single nozzle Alcohol Injection kit (100% methanol)
  • Precision Turbo "PT51" 57mm turbo (maxxed out at 23-24 PSI on this combo), bought & installed new Nov. 2003
  • Precision Turbo 3" stainless downpipe, ATR 3" stainless catback exhaust
  • Stock intercooler (Garrett air to water, DIY ported inlet, factory original pump hotwired)
  • Cheap all season Sears "Viper HX" 245/50/16 tires on stock rims


Old 12.26 Stock Turbo Combo Timeslip
The fastest I went on the stock turbo was on October 15th, 2003:

60: 1.726
1/8: 7.768 @ 88.49
1/4: 12.269 @ 108.66 on pure 93 octane pump gas (with alcohol injection) at 20-21 PSI, Max RPM: 4650

To the best of my knowledge, this is the fastest time any Syclone has run on a stock turbo, without modifying the stock wastegate to dump into a custom 3" downpipe. I had the stock 2.5" downpipe, and the troublesome stock internal wastegate which caused my boost to always fluctuate like a "roller coaster" on DataMaster. I felt like this time could definitely also have been improved upon after I learned chip tuning. Here's the DataMaster file for that run:

"Record Setting Power as low as 2925 RPM!"


Download my DataMaster file
.

  • Factory Stock Mitsubishi "TD06 17C 8cm2" Turbo, DIY ported exhaust housing, maxed out at ~20 PSI on this combo
  • Factory original torque converter (~2200 RPM) and 700-R4 transmission (never rebuilt)
  • Off the shelf V7 Ultimate chip, T3-24
  • Stock 28# Fuel Injectors, 32 PSI base fuel pressure (to compensate for alky on Pump Speed 10)
  • SMC Enterprises "Round Tank" single nozzle Alcohol Injection kit (100% methanol)
  • ATR 3" stainless catback exhaust, 2.5" test pipe
  • Stock intercooler (Garrett air to water, DIY ported inlet, factory original pump hotwired)
  • Cheap all season Sears "Viper HX" 245/50/16 tires on stock rims




Don't you wish all fast racers released this much specific information about their race proven combos? Why don't they...?



2008 Josh Straub Home | Syclone | Turbo Grand Prix | Computing | Contact
  Last Modified: Thursday, 25-Jun-2009 20:07:51 UTC