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In the Toyota Supra community, they have delineated several general levels of performance modifications so that everyone knows what everyone is talking about. The Nissan 300ZX Twin Turbo community is similar, though they have a much more structured plan.
Anyway, I thought perhaps we should do the same. Taking a page out of the Supra book, I followed their general structure and have come up with the following. I think it would help us all in our discussions and perhaps provide a sort of guide for the people who are beginning their performance tuning. Perhaps at some point, if everyone agrees, Scott could post the info as a Performance FAQ of some sort.
The only limitation is that my experience is pretty much limited to the B202 16v engine and the LH fuel injection system. Thus the list really only applies to 16v c900 and earlier 9000 Turbos, with a heavier emphasis on the former (just because it's what I know).
So, please read and see what you think. Of course, open to suggestions on where to place modifications where on the scale, but I think I've put them generally in good places. One thing I would note about the Supra list is that they have adjustable cam gears as a pretty early modification. I would do the same, but they are not readily available for our cars. I've also included a link to mkiv.com, a very good Supra info site. Search under 'Tech Articles'.
16v Turbo c900 and -91 9000 Performance Upgrades Nomenclature Proposal
Basic Performance Upgrades (BPU)
-drop in air filter, K&N or similar
-3" downpipe, 3" catback exhaust system
-tweaked APC or manual boost controller (mechanical)
-rising rate fuel pressure regulator
-ignition wires
-APC solenoid valve mod
-recommended boost gauge
BPU+
-24# or 30# injectors, with AMM tuning for idle quality
-recommended A/F gauge
-modified APC
-‘Viggen spec' BOV (turbo bypass valve)
-piggyback fuel controller install, Apex'i, HKS or Greddy OR LH fuel system hack chip
-recurved distributor / advanced ignition diaphragm
BPU++
-9000 front mounted intercooler OR Abbott water cooled IC OR intercooler puller fan install
-water injection
-2.1L or 2.3L head, port matched, polished
-MSD or Crane Cams ignition with boost retard
-cams
-turbo upgrade, recommended T3/60 or T3/Super 60
Advanced Performance Upgrades
-stand alone engine management, with either proprietary or stand alone electronic boost controller; APC, aftermarket ignition, RRFPR all removed
-low compression pistons, 1mm overbore, full engine balance and blueprint
-turbo upgrade, T3/T4 hybrid, ceramic ball bearing option
-fuel pump upgrade
-external wastegate
APU+
-headers
-oversized valves
-solid lifter conversion
-adjustable cam gears
-air outlet covers - +50hp!!
other recommended modifications:
-89+ transmission upgrade, ie. larger pinion bearing
-91+ transmission upgrade, ie. larger pinion bearing and beefier gears and synchros
-Jorgen Eriksson 4-speed rally-spec transmission, via Gary Moore / Three Trolls Tuning
-9000 clutch and flywheel retrofit
-kevlar composite clutch disc
-PCV and emissions systems removal
-throttle body de-icing coolant lines removal
-air conditioning system removal
-wideband O2 sensor
-Koni or Bilstein shocks
-lowering springs
-sway bars
-poly bushings
-short wheel base modification
posted by 199.213....
, Thu, 11 Jul 2002 15:53:05
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