Uprated Cams for 1j

[gtstarga]

As above, what sort of prices and what power gains?

Thanks

[Kai]

You might find these handy too, Simon:

http://www.junauto.co.jp/products/cylinderhead-part/camshaft/camshaft-1jz.html?en

[gtstarga]

Thanks Kia,

can some one please explain the variations on cams????

[Darket]

http://www.streetracersonline.com/articles/camshafts/

Someone else with a google phobia ? :D

[adi]

theres a lot of talk on cams for the 1j on supraforums. You basically need them if you're increasing the rev range i think, or going silly boost ie over 20psi.... although i've heard going too big can cause lumpy idling. 264's are apparently ideal, but something like 272's (?) will see you into 9000 rpm :) which is fine if your turbo boosts well enough to sustain it..

i dunno really.. i'm no expert..

[gtstarga]

So if I did this with standard boost if could have negitive affect?

[Sgt Bilko]

It would make for an odd power delivery.

Increasing cam duration will move the power UP the rev range. For a road driven car this is not good, and only done when you want a serious power gain coupled with other mods.

If you intend using standard boost then stick with either stock cams or mild ones if the money is burning a hole in your pocket.

If i were you i'd spend the money elsewhere as it sounds like your only after a little bit more power than stock.


Sarge.

[Summit]

So if I did this with standard boost if could have negitive affect?

I will agree with the others on this. At standard boost on the standard twins, you will only have a small power gain with upgraded cams. Very little power for the money spent. You would see bigger gains spending that same money on some other modification first. I would not add cams untill you where in the 500hp range. then you would see a good gain.

[majic79]

Why not get some uprated injectors (440 or higher?) and maybe a walbro, then you can up the boost some more?

EDIT: Just re-read your build thread, scratch my earlier idea! How about a getting a PowerFC Commander, rather than an SAFC?

[gtstarga]

Why not get some uprated injectors (440 or higher?) and maybe a walbro, then you can up the boost some more?

I have already done this!!!!! Other mods like Y pipe and down pipe on the way too. Boost wise best to stay standrad for now.

[majic79]

My bad - I editted my post tho!

[Sgt Bilko]

Well, your next move should be to prepare the engine for higher boost.
Get yourself a spare motor, tear it down and do a rebuild with some forged pistons and steel rods, use Clevite 77 bearings and fit a new oil pump. Get the flywheel lightened and fit a good uprated clutch. ARP head bolts / studs and a Metal head gasket too.

Get it this far and all your addons from here will then be bolt on stuff which you can do in your own time. At least you will then have a VERY stong engine to play with.

Sarge.

[majic79]

JZ engines have a multi-layer metal head gasket as stock anyway (2JZ for sure, would have thought the 1JZ used the same gasket as there's no difference in bore between the two engines).

Not sure about the 1JZ, but the 2JZ has been proven to around the 800bhp mark on a stock bottom end. I think rebuilding it'd be pretty pointless unless there's some other problem with it.

[gtstarga]

You are correct the 1J also has the metal multi layer head gasket. It is know to take around the 600bhp mark on standard form. Boost will stay standard for now as I will save up for bigger/hybrid turbos in the future! I am really looking to increase the preformance with other mods not just wind up the boost!!

[Sgt Bilko]

Not sure about the 1JZ, but the 2JZ has been proven to around the 800bhp mark on a stock bottom end. I think rebuilding it'd be pretty pointless unless there's some other problem with it.

I'd rebuild it anyway for peace of mind. Better to know what your playing with before leaning on it with more boost etc, it could end up an expensive dissapointment otherwise. Also any engine of this vintage is going to have a few miles on it and/or it could have been rebuilt by some chav.

I wouldn't chance it. Its better to know for sure what you got.

You roll the dice, but i prefer a sure thing.

Sarge.

[gtstarga]

There absolutly no need for the power I am looking at. It is a 35,000 miles engine and known to take much higher horse power than standard. I am not looking to get big power just a nice 400-450bhp when I can afford new tubbies!!

[garethr]

......it could have been rebuilt by some chav.I doubt if anyone has ever rebuilt a 1JZ-GTE in the UK. In the unlikely event that one breaks, it's much easier just to buy a used motor, and anyone going for enough power to require upgraded parts would almost certainly start with a 2JZ.

[Summit]

I woud worry more about the std twins than anything else. Many have been known to come apart under higher boost.