Ajustments after cam install?
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From: Rio Rancho NM
Ajustments after cam install?
I have searched and searched but can't seem to find what I'm looking for. This weekend I will be installing GSC S1 cams, and would like to know where to start tuning them. Do I need to increase fuel due to more airflow and pull timing due to increased ve? Right now I have basic bolt ons, will be running 91 octane fuel and between 21 and 22 psi. I don't want to blow anything up on the first wot run after the install and need input on a starting point? Any advice or input would be great, thanks in adance.
I havent upgraded cams yet, but from what I understand, u need to bump up the timing in the idle area, bump up the idle a bit, to get them to idle better. I here those cams idle *almost* like stock. And yes, I think it would be a good idea to lower timing a couple * . I would think ur gonna need to re-do the mivec map as well.
GL
GL
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I havent upgraded cams yet, but from what I understand, u need to bump up the timing in the idle area, bump up the idle a bit, to get them to idle better. I here those cams idle *almost* like stock. And yes, I think it would be a good idea to lower timing a couple * . I would think ur gonna need to re-do the mivec map as well.
GL
GL
Right now I run 7* at idle and use the JDM MIVEC map. Do I need to increase the fuel as well? As for timing though the rpm band do I want to pull a few degrees everywhere, or just up top?
Im guessing, but ~ 9-12* @ idle, not sure on fuel, and I would say yes, pretty much everywhere, for starters, just to be safe...
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Sounds good, so if I pull 3* all over than i can take the same mtbt approach I have been? I also like the lope at idle, I know it won't be very noticable on such a mild cam but if I leave idle at 7* and have a little lope will it hurt anything. I don't really care about wasting gas, cmon I drive an evo.
Sounds good, so if I pull 3* all over than i can take the same mtbt approach I have been? I also like the lope at idle, I know it won't be very noticable on such a mild cam but if I leave idle at 7* and have a little lope will it hurt anything. I don't really care about wasting gas, cmon I drive an evo.
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Thanks for your help man, I know this is a noob topic and I didn't know if anyone would reply. Thanks for taking the time to post, any other pointers you can think of when adjusting timing after the install?
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From: mnt vernon ny
if your talking about ignition timing leave it if your talking about mivec timing i have not a clue... sry. hope some one can chip in.
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Ignition timing, I'm gonna stick with the jdm mivec map. So if your stating to leave timing alone then what changes do i make after installing the cams, now im confused...
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From: mnt vernon ny
i mean leave the timing alone in the wot section if its not knocking then your fine. if you want to see if the cams will allow you to add more timing then that's up to you. but cam timing/duration has no relation to spark ignition.and raise in idle 7-9* as some one said.
Sounds good, so if I pull 3* all over than i can take the same mtbt approach I have been? I also like the lope at idle, I know it won't be very noticable on such a mild cam but if I leave idle at 7* and have a little lope will it hurt anything. I don't really care about wasting gas, cmon I drive an evo.
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From: mnt vernon ny
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My approach to timing is to follow the MTBT method, i.e., Minimum Timing for Best Torque. Simply stated, the method declares that a tuner should advance timing until advancing the timing no longer yields gain in power/torque or, lacking a dyno, until knock is encountered. On the last Evo 9 that I tuned, 1* beyond 10* at the top end and the car started registering 2-3 counts of knock. So I backed the timing from 11* to 10* and stopped tweaking the timing map.
NB: The method outlined above to setting the timing ONLY applies to 91-93 octane gasoline. If you are using E85 advancing the timing until knock is encountered will yield poor or catastrophic results. You can go past MBT on E85 and not encounter knock. You might end up damaging your engine.
NB: The method outlined above to setting the timing ONLY applies to 91-93 octane gasoline. If you are using E85 advancing the timing until knock is encountered will yield poor or catastrophic results. You can go past MBT on E85 and not encounter knock. You might end up damaging your engine.
So what changes did you end up making? I just installed some Cosworth M2 cams this weekend and my car is running like crap. It idles fine (I did up the idle a bit and added timing under low (idle) conditions) but when I put it in gear and touch the gas it doesn't move! It bogs like crazy and builds boost incredibly fast...
Did you take out 3* everywhere? Add any fuel?
Did you take out 3* everywhere? Add any fuel?
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So what changes did you end up making? I just installed some Cosworth M2 cams this weekend and my car is running like crap. It idles fine (I did up the idle a bit and added timing under low (idle) conditions) but when I put it in gear and touch the gas it doesn't move! It bogs like crazy and builds boost incredibly fast...
Did you take out 3* everywhere? Add any fuel?
Did you take out 3* everywhere? Add any fuel?
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