i bought a sage two cam and i was wondering if you have to change the springs or not.

 

nope, unless you plan on constantly spinning the motor over 6500rpm, then you would need new springs.

 

ok whet would be the easiest way to swap it out.

 

The easiest way for me would be to take the whole head off the motor and use a valve spring compressor and take the springs off the right way...

 

opps i ment the cam not the springs

 

you can just use a really large screwdriver and pry down the valves a wee bit to get the rockers out (be sure to adjust the crank beforehand so u dont bang on ur pistons) take the cam off and slide the new cam in place (dun forget assembly lube an semen) and run it at 2-2.5k rpm for 20 minutes.
Whatever you do don take ur towers off unless you know a shop that can align hone for cheap....and the answer is no cuz they're expensive.

 

oh and prying you have to pry on the edge of the valve keepers just to get it to go down so its a huge PITA to get them down so use a really fat flathead thats how i did it AND DONT LOSE THOSE LITTLE TEENIE DOOHIKITIES that get pushed down by the rocker arm. i wish i could think but i went to bed at 4 and had to work at 10 and man what a shitty day so far EXCUSE FOR TODAY

 

Oh hey... a thread on cam R&R

https://www.zdriver.com/forums/showt...&highlight=cam

 

thanks nismo i saw that before but i couldnt find it again. hopefully i'll be able to do it next week. depends if it rains on my days off or not. thanks for the advise.

 

Just curious - can you run a stage two with a stock ECU

 

Indeed.

 

i was wondering if there is a performance cam available for the 83 turbo? msa doesn't seem to have one.

 

Yes they do.

Not worth it though.

 

Is the 82 N/A cam a upgrade for a turbo engine? I thought it was.

 

i thought i remember reading something about that, but it not being a big difference, why isn't the cam for the 83 worth it? is it due to my hydraulic lifters?

 

The only L-series head that got hydraulic lifters is the P90A turbo head. Also, with the hydraulic lifters, you can't use a standard camshaft.

And I believe the "E30" cams with "A" stamped on the back are the ones that are the hot ticket for turbo motors.

 

I thought the stock ECU's didn't work with a performance cam. Are there some configurations that do?

 

A cam will work with the stock EFI, but you have to remember that the computer gets it's reading from engine vacuum, and an overly large cam does not produce much vacuum as compared to a stock or mild cam.

I believe this can be band-aid fixed by adjusting the AFM.

 

Hum... I think I know what you MEANT to say, but the computer doesn't get it's readings from vacuum, otherwise there would be a MAP Sensor instead of an AFM.

More than anything, performance cams change the valve timing & height. Combined with a good quality exhaust, intake, ignition, and adjusting the AFM / CHTS, you've got a greatly tuned street machine.

 

lol yea, I guess I coulda worded that better :P

 

So you can use the stock ECU with a cam but you need to adjust the AFM somehow? Is there a link for that?

 

Yes, it will work w/ a stock ecu (but there is more potential w/ a stand alone or upgraded ecu).

Here's the info on AFM adjustments: https://www.zdriver.com/forums/240z-280zxt-s30-s130-tech-tips-275/js-how-rebuild-your-afm-15277/

Those links are pretty old & I don't think they work anymore, so here's a MS Word document on the how-to.

 

most often your hurting more than helping running a hopped up cam with the stock EFI. If you cant adjust your AFR using a cam is worthless. Theres really only band-aid fixes for that using the stock EFI.

If you want to have a cam and actually use it go carbs or tunable ECU.

 

my head says p90 on the side, how do i know if it's the 90 or 90a? i read somewhere on here the p90a isn't stamped as such, that you have to look at something once the valve cover is off? what am i looking for? forgive me i'm a noob to modifying these cars, but i friggin love em.

 

P90 is solid, it will be stamped P90A otherwise.

The only discrepancy is that some of the early 82 heads are stamped P90A but have solid lifters