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Discussion Starter · #262 ·
Cheers Simon

So this weekend I've got the 1uz out of the 5

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Honda K20. Maybe one day in a different 5!

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I've now dropped the 3uz into the engine bay. The big test was will the bonnet shut thou!

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Yes it shuts. If it didn't shut I wouldn't of used the 3uz. But thankfully it does and I can make the engine work.

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I've also gained space at the back of the cylinder heads as the vvti ones are flat at the rear. So I've moved the engine back around 10mm. This will give more bonnet clearance and kind of help to compensate the fatter vvti engine, Which is the only down side to them.
So my plan now is to get the 3uz engine finished of and to run it on the stock Lexus 3uz Ecu.

Thanks Matt
 

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Discussion Starter · #267 ·
Cheers guys

I've been finishing the engine of now. But it's been abit of a pain as I took it apart so long ago. So I've spent a lot of time working out which bolt went where etc.

But I've got a new cambelt kit fitted and the timing is all spot on which is a relief as I have the vvti cams apart. I also fitted a new thermostat.

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Ive now got to work out how to route the induction as I'll have to make a boss for the MAF sensor.

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I've also brought a E46 BMW fuel filter with a inline regulator. Hopefully this will work well with the 3uz as it doesn't have a fuel return on the rail. The only problem i have is where I'm going to mount this filter as it's huge!

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Thanks Matt
 

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Discussion Starter · #269 ·
It should have 300hp and 330ftlb from factory. But there's a few people who have claimed more with a decent exhaust and induction. I've seen 350hp on one but it has some super nice headers. Which I just don't have the room for unfortunately. I'll be happy with 300hp as it's a flat power curve with the VVTI and varible Inlet tracks.

Thanks Matt
 

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Discussion Starter · #274 ·
Bit if an update. I got the fuel filter mounted in the tunnel which has worked well. I fitted a heat shield to protect it from heat.

I've got lots done but not many pictures. The biggest step has been the engines running on the stock GS430 engine management.
Big thanks to Chris at Phoenix engine management who has made it possible. To cut a long story short he has stripped all unnecessary wiring and has modified the ecu internals to trick the ecu to hold full power mode and also to not throw a tantrum because the auto box is missing.
I also have fully working obd2 connector which is nice.

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I had to modify the mx5 pedal box to mount the gs430 pedal. But it was pretty straight forward and the pedal is in the stock mx5 position.

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So all was going good until a coolant leak. It seems the new water pump I fitted is faulty. So I'm now waiting for a new genuine Lexus pump to arrive. Then I'm left with the heater pipes to connect which need moving to the other side of the engine bay and some tidying up. So it should be back on the road pretty soon.

Thanks Matt
 

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Fantastic build! Such a great of the shelf engine for a 5, very jealous of your skills! I was going to try this with a mk2.5 but bottled out. Looking forward to see how she goes with the vvti fitted.
 

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Cheers guys.

I'm looking into that DOM. The only problem is I need to include the Toyota MAF sensor. But it has to be kept in a inlet pipe the stock Lexus size which I think is 80mm ID. Also I'm not keen on losing the Mazda bonnet catch.

So I'm starting to loss my patiences with this mx5. Everything is a battle. So I ordered a new genuine water pump from Lexus which arrived Friday. Straight away I'm looking at the gaskets supplied and I can't work out where the big Oring fits. Turns out I've made a big mistake. The front water bridge separates into 2. I never realised that as it looks one casting. So all I had to do when was split the 2 halfs and realign the front section and it was a nice fit onto the old water pump. So I never needed to order a new one :(.

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So whilst all that was going on I rerouted the heater pipes. I now have one in the stock Mazda position and a the other points on the other side of the engine.

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So all going good, all I had to do was refit the inlet. Drop the car down and go for a spin!
But the unthinkable happened. I dropped a washer whilst working over the car and it fell into number 8s inlet port and guess what? Those valves where open :( :( :(. So 4 hours where wasted with a old dipstick, a magnet and some grease. But I retrieved the washer. At this point it was tools down and step away from the car until tomorrow.

Thanks Matt
 
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