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My zex 59300 cam review and questions

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Old Jun 13, 2010 | 06:53 PM
  #1  
vtec8200's Avatar
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Default My zex 59300 cam review and questions

I recently got a very good deal on a barely used zex 59300 camshaft for my d-series.
Here is the setup:
-d16y8 stock block
-d16z6 head milled 0.060''
-58 mm b18a tb
-2.25'' exhaust no cat
-3'' short ram
-d16y8 4-2-1 stock header

I set the valve lash to 0.007'' intake and 0.009 exhaust as suggested on the spec sheet.
Valvetrain noise has increased but it is not dramatic, however the car is much louder especially at part throttle. Vtec engagement is smooth and unnoticeable and sounds more agressive. The car has not been tuned but the idle is just like stock. Power seems to drop off at around 7300 rpms but it might be because I am still on stock valvetrain. Butt dyno didn't see a power difference so I guess I will have to get it tuned, which I think sucks because the car needs a lot of work before I can spend money on dyno time, might not even be this summer.

I played with my igntion timing to see if my motor liked it better and it liked 16-18 degrees not more.
Has anyone seen gains with this cam without a tune? Any tips or tricks until I get it to the dyno? Right now it needs new brakes, lower and upper ball joints and an alignement at the very least. Will be spending money there before.
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Old Jun 13, 2010 | 07:13 PM
  #2  
nus_dogg's Avatar
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Default Re: My zex 59300 cam review and questions

My Bisi Level 2 VTEC cam on my F22B1 I had ran super lean in the upper RPM w/o tuning. Just so you get an idea that yours might be lean on high RPM with no tuning.
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Old Jun 14, 2010 | 06:45 AM
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Mr_ET's Avatar
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Default Re: My zex 59300 cam review and questions

if the cam makes any power over the stock one anywhere it will by nature make the motor run lean.

Anyone upgrading camshafts should ALWAYS get the car tuned right after or run the chance of blowing their motor up.
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Old Jun 14, 2010 | 07:47 AM
  #4  
alcarp's Avatar
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Default Re: My zex 59300 cam review and questions

Originally Posted by Mr_ET
if the cam makes any power over the stock one anywhere it will by nature make the motor run lean.

Anyone upgrading camshafts should ALWAYS get the car tuned right after or run the chance of blowing their motor up.
Agreed.

Bigger cams obviously increase the time the valves are open, which results in larger amounts of air being drawn in, but the ecu will not be able to match it with the correct(which should be increase) amount of fuel.

Without tuning I would limit yourself to half throttle and 4000rpm to save your motor
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Old Jun 14, 2010 | 07:59 AM
  #5  
95 integra's Avatar
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Default Re: My zex 59300 cam review and questions

Advancing the ignition timing over 18*s, revving it past 7300 rpms on stock valvetrain w/ aftermarket cam and having no tuning......damn surprised it hasnt already blown up.
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