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Location:
Kenthurst, Sydney
Registered:
February 2003
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My Turbo Crown
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Sat, 16 August 2003 06:09
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1981 MS112 Toyota Crown 7MGTE
  
  
  
Specs
Engine: Toyota 7M-GTE (3000cc single turbo, 24V twin cam inline 6) (ex 88 Supra)
Turbo: CT26 with 88 Supra intercooler
Exhaust: 3" Mandrel bent with 3" cat, 2 mufflers
Gearbox: R154 Supra turbo 5 Speed
Clutch: Ceramic 5 puck brass button clutch plate, 1130kg pressure plate
Cooling: V8 Commodore radiator with 16" Davies Craig thermo
Diff: 4.1 F series live axle
Brakes: Nissan 200SX four spot front calipers with 200SX vented discs, stock rear discs, bias valve
Suspension: Koni adjustable shocks all round, Kmac lowered springs, Kmac sway bars
Wheels: 16" Supra mags 225/50/16
Inside: Autometer boost, oil pressure and voltage gauges. Sansui MP3 Player.
When I bought this car it had a blown head gasket (7M's commonly have this problem). I completed a full engine rebuild of the 7MGTE during winter of 2003. I fitted new rings and bearings, and all new gaskets. I had the bores honed, and the block and head was resurfaced. The rods were closed and honed to get the bearing clearances perfect and the crankshaft was checked for straightness (only .001" runout) . The head has new valve guides and the ports lightly cleaned up but not enlarged. To prevent further head gasket problems I installed some ARP head studs. These allow you to torque the head down tighter and don't stretch as much as the standard head bolts.
The gearbox was always noisy in 5th gear. While the engine was out I stripped down the gearbox and found that one tooth had been broken off fifth gear. Pretty strange for this to happen to the tough R154 gearbox. After a long search I found a new fifth gear and put the gearbox back together. Now it is quiet and smooth in all gears 
Before all this (after only two weeks of ownership), the first diff was blown! I replaced it with another stocker which has thankfully held out for the last 18 months. Soon I will be replacing the standard Crown diff with a sturdier LSD.
Latest Dyno Sheet
210kw at rear wheels
at Toymods Dyno Day
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: My Turbo Crown
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Sun, 17 August 2003 07:35
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HUGE! 
I love the beast dude
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Location:
Melbourne
Registered:
May 2002
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Re: My Turbo Crown
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Sun, 17 August 2003 08:53
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Is that a stock ECU???? mine ran way rich 
Allan
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Location:
Kenthurst, Sydney
Registered:
February 2003
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Re: My Turbo Crown
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Sun, 17 August 2003 23:10
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Thanks Karl
Allan the ECU is stock but the fuel pump is still the Crown pump, which is maxxing out and hence the leaner than usual mixtures at the top end (although still safe). I am about to install a new porsche turbo pump which should richen up the top end and allow me to run a bit more boost 
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Registered:
March 2003
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Re: My Turbo Crown
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Wed, 15 October 2003 01:50
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That is a very impressive build up
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Membership Secretary
Location:
Sydney
Registered:
June 2002
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Re: My Turbo Crown
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Wed, 15 October 2003 02:07
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Gotta Love those Turbo Crowns
Have been a passenger in this one and my i wish my Grandpa Had a car this quick.
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