NA-TT Differences - Revision history

Administrator at 23:10, 29 June 2018

2018-06-29T23:10:08Z

Maintenance script: Imported from text file

2018-04-05T21:58:22Z

Imported from text file

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Shortly after the Z32's release in 1989 (as a 1990 model year in the US), Nissan released the Twin Turbo version. There were several changes to this model that set it apart from the NA, which are detailed in this article.<br />
===Cosmetic/Visually Noticeable Changes===

* Twin Turbos came standard with a rear [[Spoiler|spoiler]].
* Twin Turbos had slots in the front bumper to allow air flow to the [[Intercooler|intercoolers]].
* In the US, Twin Turbos had wider (8.5") rear wheels.
* Twin Turbos have a [[Boost Gauge|boost gauge]] in the [[Gauge Cluster|gauge cluster]] under the speedometer.
* When looking in the engine bay, Twin Turbos have four intake pipes visible, while NAs have two.
* When looking in the engine bay, 90-93 Twin Turbos had [[HICAS]] solenoids mounted near the power steering reservoir.

===Engine===

* TT had, well, turbos.
* Differently angled [[Oil Squirter|oil squirters]].
* NAs had [[Oil Filter|oil filter]] check valves installed directly in the block, TTs used a different oil tree which housed the check valves.
* TT oil tree has a feed line for the [[Oil Cooler|oil cooler]].
* TT oil pan has returns for the oil cooler and turbochargers.
* Pistons have different compression ratios (8.5:1 for TT, 10.5:1 for NA).
* TT pistons have a hollow spot that fills with oil for better cooling.
* TT oil pump has a tighter pressure relief spring (to compensate for oil flowing to the turbochargers and oil cooler)
* TT exhaust valves are made from inconel to deal with higher exhaust temps.
* TT [[Cylinder Head|heads]] have different (better) castings.
* TT exhaust manifolds are completely different as they support the turbochargers.

===Electrical===

* [[Coilpack|Coilpacks]]have different part numbers and slightly different high tension lead designs, but are considered interchangeable.
* The TT [[ECU]] has provisions for a dual-speed [[Auxiliary Fan|auxiliary fan]], three-speed [[Fuel Pump|fuel pump]], and [[Wastegate|wastegate]]control solenoids. The TT's [[EPROM]] also has different programming due to the different fuel injector size and the nature of forced induction.
* The TT [[EFI Harness]] contains connectors for the wastegate control solenoids.
* The TT gauge cluster has a boost gauge under the speedometer.
* The TT fuel pump is a higher output (supporting upwards of 700 HP), and has 3 control speeds (2 for the NA).
* TT fuel pump controller is different and has an additional wire for the additional speed. Wiring from the ECU to the [[FPCU]]is also different for this reason.
* TT [[Fuel Injector|Fuel Injectors]] are higher flowing (370CC vs 270CC)
* The TT auxiliary fan has 3 speeds (versus the NA's 2 speeds).

===Drivetrain===

* Different rear differentials (3.67 on the TT, 4.08 on the NA).
* TT rear subframe is different to accommodate HICAS.
* Driveshafts are different for practically every configuration (TT, NA, 5-speed, auto, 2+2, 2-seater).
* Despite the [[Transmission|transmission]] gearboxes being the same, the TT has a larger bellhousing to accommodate the larger [[Flywheel|flywheel]], which also places the starter further outwards.
* TT and NA [[Speed Sensor|speed sensors]] are different due to the difference in final drive ratios.
* TT has a larger [[Clutch|clutch]] and flywheel.

===Other===

* [[Radiator|Radiators]](and fan shrouds) are totally different. NA has end-tanks on the top and bottom, TT has them on the sides. TT radiator is taller but narrower to make room for the intercooler piping.
* [[AC Condenser|A/C condensers]] are different shapes (similar to the radiators).
* A/C piping is different.
* 90-93 TT power steering pumps, lines, and rack are different due to the hydraulic HICAS. In 94, the TT switched to electrical SuperHICAS, and the power steering system (except for the rack) became identical to the NA's. 90-93 TTs also had hydraulic lines running to the HICAS rack at the rear of the car.
* TT [[Steering Rack]] has a quicker steering ratio.
* 90-93 TT has HICAS, 94+ TT uses electric SuperHICAS.
* TT [[Shock|shocks]]had adjustable internal valves, which could be changed through a cabin-mounted "SPORT/TOURING" rocker switch. Sport mode made the shocks firmer for better handling, and Touring made them softer for better comfort.
* TT [[Alternator|alternator]]outputs 90 amps, versus the NA's 80 amp alternator.
* TT intake system is totally different after the [[Air Box|air box]]. The NA's piping goes straight from the [[MAF]]to the throttle bodies. The TT goes from the MAF to the turbo inlets, turbo outlets to intercoolers, and intercoolers to throttle bodies. The TT also has [[Recirculation Valves|recirculation valves]]
* USDM TT exhaust has [[Pre-cat|pre-cats]] coming right off the turbo, mandrel bending in the mufflers, smaller resonators, and shorter [[Catalytic Converter|catalytic converter]] pipes. JDM TTs don't have pre-cats, and instead using a simple [[Downpipe|downpipe]], which bolt directly up to NA catalytic converter pipes.
<br /> <br />
----
Thanks to [http://z1motorsports.com Z1Motorsport]'s handy [http://upload.z1motorsports.com/Z1 Z32 NA to TT Conversion.pdf guide] for the bulk of this information.<br />

[[Category:General Info]][[Category:Turbo System]]

@@ Line 1: / Line 1: @@
-Shortly after the Z32's release in 1989 (as a 1990 model year in the US), Nissan released the Twin Turbo version. There were several changes to this model that set it apart from the NA, which are detailed in this article.<br />
+<div class="mw-parser-output">Shortly after the Z32's release in 1989 (as a 1990 model year in the US), Nissan released the Twin Turbo version. There were several changes to this model that set it apart from the NA, which are detailed in this article.
-===Cosmetic/Visually Noticeable Changes===
+=== Cosmetic/Visually Noticeable Changes ===
-* Twin Turbos came standard with a rear [[Spoiler|spoiler]].
+*Twin Turbos came standard with a rear [[Spoiler|spoiler]].
-* Twin Turbos had slots in the front bumper to allow air flow to the [[Intercooler|intercoolers]].
+*Twin Turbos had slots in the front bumper to allow air flow to the [[Intercooler|intercoolers]].
-* In the US, Twin Turbos had wider (8.5") rear wheels.
+*In the US, Twin Turbos had wider (8.5") rear wheels.
-* Twin Turbos have a [[Boost Gauge|boost gauge]] in the [[Gauge Cluster|gauge cluster]] under the speedometer.
+*Twin Turbos have a [[Boost_Gauge|boost gauge]] in the [[Gauge_Cluster|gauge cluster]] under the speedometer.
-* When looking in the engine bay, Twin Turbos have four intake pipes visible, while NAs have two.
+*When looking in the engine bay, Twin Turbos have four intake pipes visible, while NAs have two.
-* When looking in the engine bay, 90-93 Twin Turbos had [[HICAS]] solenoids mounted near the power steering reservoir.
+*When looking in the engine bay, 90-93 Twin Turbos had [[HICAS|HICAS]] solenoids mounted near the power steering reservoir.
-* TT had, well, turbos.
+=== Engine ===
-* [[Coilpack|Coilpacks]]have different part numbers and slightly different high tension lead designs, but are considered interchangeable.
+*TT had, well, turbos.
-* The TT [[ECU]] has provisions for a dual-speed [[Auxiliary Fan|auxiliary fan]], three-speed [[Fuel Pump|fuel pump]], and [[Wastegate|wastegate]]control solenoids. The TT's [[EPROM]] also has different programming due to the different fuel injector size and the nature of forced induction.
+*Differently angled [[Oil_Squirter|oil squirters]].
-* The TT [[EFI Harness]] contains connectors for the wastegate control solenoids.
+*NAs had [[Oil_Filter|oil filter]] check valves installed directly in the block, TTs used a different oil tree which housed the check valves.
-* The TT gauge cluster has a boost gauge under the speedometer.
+*TT oil tree has a feed line for the [[Oil_Cooler|oil cooler]].
-* The TT fuel pump is a higher output (supporting upwards of 700 HP), and has 3 control speeds (2 for the NA).
+*TT oil pan has returns for the oil cooler and turbochargers.
-* TT fuel pump controller is different and has an additional wire for the additional speed. Wiring from the ECU to the [[FPCU]]is also different for this reason.
+*Pistons have different compression ratios (8.5:1 for TT, 10.5:1 for NA).
-* TT [[Fuel Injector|Fuel Injectors]] are higher flowing (370CC vs 270CC)
+*TT pistons have a hollow spot that fills with oil for better cooling.
-* The TT auxiliary fan has 3 speeds (versus the NA's 2 speeds).
+*TT oil pump has a tighter pressure relief spring (to compensate for oil flowing to the turbochargers and oil cooler)
+*TT exhaust valves are made from inconel to deal with higher exhaust temps.
-===Drivetrain===
+*TT [[Cylinder_Head|heads]] have different (better) castings.
-* Different rear differentials (3.67 on the TT, 4.08 on the NA).
+=== Electrical ===
 * TT rear subframe is different to accommodate HICAS.
-* Driveshafts are different for practically every configuration (TT, NA, 5-speed, auto, 2+2, 2-seater).
+*[[Coilpack|Coilpacks have]] different part numbers and slightly different high tension lead designs, but are considered interchangeable.
-* Despite the [[Transmission|transmission]] gearboxes being the same, the TT has a larger bellhousing to accommodate the larger [[Flywheel|flywheel]], which also places the starter further outwards.
+*The TT [[ECU|ECU]] has provisions for a dual-speed [[Auxiliary_Fan|auxiliary fan]], three-speed [[Fuel_Pump|fuel pump]], and [[Wastegate|wastegatecontrol]] solenoids. The TT's [[EPROM|EPROM]] also has different programming due to the different fuel injector size and the nature of forced induction.
-* TT and NA [[Speed Sensor|speed sensors]] are different due to the difference in final drive ratios.
+*The TT [[EFI_Harness|EFI Harness]] contains connectors for the wastegate control solenoids.
-* TT has a larger [[Clutch|clutch]] and flywheel.
+*The TT gauge cluster has a boost gauge under the speedometer.
+*The TT fuel pump is a higher output (supporting upwards of 700 HP), and has 3 control speeds (2 for the NA).
-===Other===
+*TT fuel pump controller is different and has an additional wire for the additional speed. Wiring from the ECU to the [[FPCU|FPCUis]] also different for this reason.
 ----
-[[Category:General Info]][[Category:Turbo System]]
+Thanks to [http://z1motorsports.com Z1Motorsport]'s handy [http://upload.z1motorsports.com/Z1 Z32 NA to TT Conversion.pdf guide] for the bulk of this information.