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...?