Zex 105300 in D16y8, Having trouble..

[sir_lagalot]

I just installed the zex 105300 cam in my rebuilt d16y8. Tuned it on the dyno with an adjustable cam gear, and found it to be yielding the most power with it advanced 4 degrees. I'm v. happy with the results, gained about 13 whp and car pulls very nicely.. only trouble is...I cant drive below 3200 rpm without it stuttering and missing :hammer: ..whats this about? i was talking to this guy about it and he said 'let it be, probably just valve overlap'..but i dont know..city driving is messed up..the second the rpm needle goes above 3200 i literally feel a kick and everythings smooth and fast from there onwards..but every gear upto 3200 its missing...i simply cant drive it like this, its very uncomfortable.

[dragman99]

is it different with a different cam gear setting?

[sir_lagalot]

i dont think so.. i had this problem since i installed the cam..it was at 0" then. Its advanced 4" now..

[Toddnos]

whats the dizzy set at?

[dragman99]

your problem may be the dizzy itself. sometimes the key gets too loose.

[nathan]

Try tuning it with engine management..just messing with cam timing isn't going to be enough. ;-)

Nathan

[Toddnos]

sounds like ignition timing is retarded........

[sir_lagalot]

i dont know what its set at..but i do know, they advanced it during the dyno run, and the car made 124 instead of 127 in the previous run so they said they wouldnt advance it and just reverted it to where it was before.. they said "its at stock position now"...

[dragman99]

i dont know what its set at..but i do know, they advanced it during the dyno run, and the car made 124 instead of 127 in the previous run so they said they wouldnt advance it and just reverted it to where it was before.. they said "its at stock position now"...


i still think the dzzy is bad.

[sir_lagalot]

yeah..thats it..confirmed with mechanic at the workshop. he says when he advanced timing, car lost power, went from 127 in previous run to 122 .. so he reverted it back.

i really need to figure out whats causing the stuttering and missing below 3200 in every gear..its way too uncomfortable driving and everybody else in the car feels it too..

car also has trouble starting.. it takes like 5-10 tries before it starts...and if i go park someplace and come back..all over again..batteries fine.

[sir_lagalot]

ok, i'll have them re-check the dizzy. Hope thats it.

[dragman99]

ok, i'll have them re-check the dizzy. Hope thats it.


just on a side note, i don't see how the tuner is making more power advancing the cam timing to begin with, especially 4 degrees unless you have a cam gear keyed for a d16z6.

[dragman99]

ok, i'll have them re-check the dizzy. Hope thats it.


take it off and check the rotor that goes into the cam. it may be really loose. i had this problem and it would skip only at 4-4500rpms.

[sir_lagalot]

well , we retarded it 2 degrees before.. and it made 114 or something ..then he advanced it 3 degrees..and it was making 124, 127, 125...pretty inconsitant..so he advanced it another degree and it made 127 in the next three runs .. thats when he advanced ignition to check further and the car made 122 ..so he just reverted it..

it was stuttering below 3200 rpm even when the cam was at 0"

[dragman99]

did this problem start when the cam was installed?

[sir_lagalot]

yep. i bought a rebuilt d16y8 head off ebay.. and this cam. and when they installed it in the head, and when it was at 0.. it sounded like a diesel because the valve lash wasnt set properly..and the car was stuttering then below 3200 as well..

then they addressed the valve lash issue the next morning..car quietened down, but stuttering is still there below 3200 rpm.

[siregcivic]

take the belt off.. advance the cam 1 tooth then retard the cam gear and set your timing with a timing light

i had the same problem.. z6 block y8 head y8 gude cam y8 stock camgear had it set to tdc everything was fine.. it was fast as shit top end.. bog below 3k.. i advance the cam 1 tooth and its fine.. i dont even have a cam gear.. it just lags a hair in the top end cuz i cant retard the cam 4 degrees but its hella tourqy low end

[Toddnos]

^x2

[dragman99]

take the belt off.. advance the cam 1 tooth then retard the cam gear and set your timing with a timing light

i had the same problem.. z6 block y8 head y8 gude cam y8 stock camgear had it set to tdc everything was fine.. it was fast as shit top end.. bog below 3k.. i advance the cam 1 tooth and its fine.. i dont even have a cam gear.. it just lags a hair in the top end cuz i cant retard the cam 4 degrees but its hella tourqy low end

if he wanted to be lazy, he could just advance the cam gear 4 or 5 more degrees and then set the timing amd see if that fixes it.

[sir_lagalot]

dizzys on fine.. retired a little though..they advanced it a tad bit, and the missing/stuttering went away but at the price of a noticeable drop in performance... i guess i'll have to keep on changing it around when need be.. car makes most power with the ignition retired but then i have to bear with the stuttering. Car also starts fine with it slightly advanced. I wish there was a way around this.

[s_18]

The 105300 is a stage 3 cam or something like that, right?

You need to TUNE it to get it right, like nathan said many posts ago...
You have got to use some money on engine management and tuning to get it right.
Adjusting the dizzy to get the car to drive either at slow or fast speeds can't be good for the engine.
You need to adjust your fuel curves to get your car to idle properly, and get the power the cam has potential for.

[dragman99]

dizzys on fine.. retired a little though..they advanced it a tad bit, and the missing/stuttering went away but at the price of a noticeable drop in performance... i guess i'll have to keep on changing it around when need be.. car makes most power with the ignition retired but then i have to bear with the stuttering. Car also starts fine with it slightly advanced. I wish there was a way around this.


it's your cam timing that's retarded too much, thus the reason the car doesn't stutter when the ignition timing is advanced. who ever put the cam in messed up and didn't get the cam gear and crank gear lined up correctly. quit messing with the distributor and fix the cam timing.

[siregcivic]

im telling him what to do... advance your cam 1 tooth and retard it 4 degrees and set your distributor in the middle.. and take it for a spin... you should have nice power down low.. if the top end lags too much retard teh cam 1 more degree at a time until you like it

[dragman99]

im telling him what to do... advance your cam 1 tooth and retard it 4 degrees and set your distributor in the middle.. and take it for a spin... you should have nice power down low.. if the top end lags too much retard teh cam 1 more degree at a time until you like it


sometimes people don't listen.

[transzex]

What color was the hippo?

[nathan]

Look, your car is going to continue running like shit when you have a huge cam in your car with a stock map. By tune I don't mean change your cam timing,....you need to alter the factory ignition maps, or yes, very likely...your car is going to run like shit.

Or did you miss the post I made over a week ago? :)

Not trying to be a dick, but if you want to solve the problem - listen :). You're going to spend far more money trying to get a mechanic to 'fix' this.

Nathan

[sir_lagalot]

i've got a few other friends running stage-2 cams.. i dont believe tuning is necessary for it to run properly. I did as dragman told me to, and its fine now. timing was off.

thanks again guys.

[nathan]

you're right, what do I know, ecu tuning isn't nescessary for radically different cam profiles...what was I thinking.

[Toddnos]

ecu tuning is necnessary to make power, but not to just make the car run normally....like not sputtering below 3500 rpm....

[ibby]

What color was the hippo?

Pink, It was called humpy

i've got a few other friends running stage-2 cams.. i dont believe tuning is necessary for it to run properly. I did as dragman told me to, and its fine now. timing was off.

thanks again guys.

Iam not gona repeat what the other guys have said..
just listen to them.

[Toddnos]

could you suck balls any harder with your sig?^^^

[ibby]

could you suck balls any harder with your sig?^^^

who me.. no
Iam learning alot of his posts :tool:

[Toddnos]

ah ok. I think your riding his nuts a bit...but whatever.

[ibby]

Ok ive changed it :) I hope iam not riding any ones nuts now

[Toddnos]

cool....transex is a knowlegable member, but i wouldnt jock that hard.....i ve been learning from him....since he was mistabone....ever looked at mistabones tranny page?

[ibby]

cool....transex is a knowlegable member, but i wouldnt jock that hard.....i ve been learning from him....since he was mistabone....ever looked at mistabones tranny page?

nope wheres his page ?

[Toddnos]

its way old,,,,i just tried searching for it, couldnt find it. Maybe transex has a link to it still.

[ibby]

never midn :)

[B00ST3D]

Just curious about the engine managaement you are talking about On my 96 EX bone stock with the excetption of an intake would there be any gains with some mapping , as it beign my DD I only plan on adding header, cat back exhaust and possibly a cam. And what tunign would you recommend for this D16Y8 stock setup if any or the gains wouldnt be noticable.

[Toddnos]

^OBD 2 to one conversion, and a p28