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How To Replace Disc Brake Calipers

More info: www.metacog.com

Subaru Owner Tips: Brake Caliper Woes!

Recorded at All Wheel Drive Auto: Independent Subaru Repair in Kirkland, Wa 98033

Subaru Impreza 2.5RS-T Widebody

A project that had been ongoing since June of 2006 has finally completed. This is going to be a monster. : : : Engine/Electronics Rescued EJ257 ...

Mark IV

The MKIV Supra’s twin turbos operated in sequential mode instead of the more common parallel mode. The sequential setup featured a pair of CT-12B turbos (for the JDM market, USDM market was CT20/CT20A with variations- some are ceramic- notorious, some are not. For UK market steel blades (CT-20/CT-20A).

Some differences in the OEM twin turbo JDM and USDM/UKDM JZA80 turbine setups include:

JDM (CT12) has 3 bolt flanges for turbo to header. USDM/UKDM (CT20) is 4 bolt. USDM/UKDM (CT20) has 4″ downpipe outlet, and full bore round ports from exhaust header to turbo.

Supposedly both setups are rebuildable from Garrett or other parts bin similarities with machining. Some rebuilds are better than others.

Initially all of the exhaust is routed to the first turbine for reduced lag. This resulted in boost and enhanced torque as early as 1800 rpm. Approaching 3500 rpm, some of the exhaust is routed to the second turbine for a “pre-boost” mode, although none of the compressor output is used by the engine at this point. Approaching 4000 rpm, the second turbo’s output is used to augment the first turbo’s output. As opposed to the parallel mode, the sequential turbos provides quicker low RPM response and increased high RPM boost. This high RPM boost was also aided with technology originally present in the 7M-GE’s in the form of the Acoustic Controlled Induction System (ACIS) which is a way of managing the air compression pulses within the intake piping as to increase power. The valve seal problem was back from the Mark II engines too. Another weakness is the engine mounts.

For this generation, the Supra received a new 6-speed Getrag /Toyota V160 gearbox on the Turbo models while the naturally aspirated models made do with a 5-speed manual W58, revised from the previous version. Both models were offered with a 4-speed automatic with a manumatic mode. However, the turbo model utilized larger 4-piston brake calipers on the front and 2-piston calipers for the rear. The base model used smaller 2-piston calipers for the front and a single piston caliper for the rear. The turbo models were fitted with 235/45/17 tires on the front and 255/40/17 tires for the rear. The base model used 225/50/16 for the front and 245/50/16 for the rears. All vehicles were equipped with 5-spoke aluminium alloy wheels and a “donut” spare tire on a steel wheel to save weight and space. Additionally, there are other differences in the rear axle differential, headlight assemblies, throttle body, oil cooler and a myriad of additional sensors that exist on the turbo model which do not exist on the normally aspirated model.

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