Who put stock 2jz cams into the 1jz?
- Thread starter AF1JZ
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foreverpsycotic said:
Measuring the clearance is something you could do yourself easily. Then if you need some shims swapped out you can always go to the shops and have them do it.
It's not that hard to swap shims you know, check the tsrm. You can use other tools than the mentioned toyota special tool to push the buckets down. Just read the tsrm and give it a try, you'll never learn if you don't try.
i can also attest to the noticable power gains of the (us)2jzgte cams in a 1jz. like its been said, the biggest difference is in the last 1000 rpm. instead of it leveling off after 6k rpm, it continues to pull harder and harder the farther you rev. i also got mine for about $80 and paid close to the same for machine work.
ONE THING TO NOTE THAT HASN'T BEEN STATED!!! when flowing more air through the head (as with bigger cams), your turbo has to spin that much faster to make the same amount of boost. i've had to replace each of my twins (six months apart from eachother [PITA]) due to them being overworked. and i'm still just at 12-14 psi!
that said, i would recomend only the people running singles to get cams, unless you're that hardcore into the stock twins...
ONE THING TO NOTE THAT HASN'T BEEN STATED!!! when flowing more air through the head (as with bigger cams), your turbo has to spin that much faster to make the same amount of boost. i've had to replace each of my twins (six months apart from eachother [PITA]) due to them being overworked. and i'm still just at 12-14 psi!
that said, i would recomend only the people running singles to get cams, unless you're that hardcore into the stock twins...
Making power isn't about boost only, it's the mass of air going in the engine.
With the increased lift there is more mass of air flowing into the engine. Boost is a 'side effect' of the head being a restriction in the air flow; there's more air being pushed in then can be processed so boost is built. The bigger cams lower the restriction, so boost drops.
You don't need to up the boost to get to the same power levels, you're making even more power now with lower boost because a bigger mass of air is going into the engine.
So, start thinking in mass of air in stead of boost. Boost is just one factor in the formula, air temp is the other factor.
With the increased lift there is more mass of air flowing into the engine. Boost is a 'side effect' of the head being a restriction in the air flow; there's more air being pushed in then can be processed so boost is built. The bigger cams lower the restriction, so boost drops.
You don't need to up the boost to get to the same power levels, you're making even more power now with lower boost because a bigger mass of air is going into the engine.
So, start thinking in mass of air in stead of boost. Boost is just one factor in the formula, air temp is the other factor.
porsches4lunch said:
Wel, it can be an easy reference to power when talking about similar engines with similar setups. Not everyone is going to be able to reference them making Xhp at XCFM. Know what I mean.
I know the point you and CTD are making, though.
correct, i realize this, i was just trying to point out that at the same level of boost, your turbos will be spinning faster than before. another thing i wouldn't recomend too much on stock twins is raising your rev limit, as it too requires the turbos to spin at a higher rpm to maintain the same boost. you still can, and with the right cam, make more power, but it will shorten the life of the turbo if you do. thank you for explaining what i left out :thumbup:Rich said: