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1jzgte main bearing cap hp limit

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Hi Andre, I know you mentioned in one of your webinar that the 2jz main bearing caps should be replaced with billet caps after 1000hp . What is your take on the 1jz in terms of the limit before bearing cap fails?. I currently have an altezza with 1jzgte. Made 662hp on pump gas 95 octane. I would like to tune on q16 and take the boost up. But want to stay within my safe limits.

Current build is bc 272 cams with springs and retainers, cp coated pistons, tomei rods, clevite bearings, Arp main studs and Arp ca625 head studs. Garrett gtw3884 ball bearing and aem v2

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I haven't had much to do with the 1JZ but my understanding is that the engine block architecture is quite similar to the 2JZ so I would expect you may run into similar problems at a similar power level.

Ok thanks for your input. My current aim is 900hp at the wheels. So I guess I should be ok.

Hey azworx

Did you like the performance and spool and power of the GTW3884r turbo?

What rear and front wheel size did you go for?

Hey xcl08

the inducer is 67mm and exducer is 65mm. With a .84 twin scroll turbine housing. Power was a bit late. I had full power by 7k rpm and redline was 8krpm .i figure with 264cams it would of been much better. However i made 600hp on 20psi pump gas (95 octane)

Hey Azworx

Cheers for the information, I have the 67mm front also with the .84 twin scroll, it is going on the dyno tomorrow and I hope to see around 700hp at around 30/35psi

I will keep you posted!

Hey Azworx

Check out the dyno graph comparing the GTX4202 (in red) with the GTW3884r (in blue)

22hp difference, the GTW is just an amazing piece of kit!

Attached Files


thats a huge difference between those turbos. I would only be able to make a comparison to my graph if it was measured in rpm. But good hp figures. What fuel you used?

I'd suggest you be wary when considering talk about 'power' points where components are concerned - going to depend on things like the tune - a touch of detonation can put a LOT of stress on the bottom end, boost/torque loadings, rpm loadings - crank flex and/or vibration, fasteners used, etc. I'm not that familiar with the engine, does it use a girdle - if not, can one be used to give more stiffness to the bottom end?

There is also how the "1000hp" is measured - was that on a chassis dyno through the tyres, hub or on engine dyno' (DIN or SAE bias?) - they can all skew the numbers by a significant amount.

I would expect you to be OK, but something to bear in mind if (when!) you want more! You already have a lot invested in the engine, considered purchasing a spare block and building it up so you can do a simple swap over for when you're looking for more?

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