xploding-twincam wrote:- Based on the above , im asking from a motor point of view if its safe to even take it for a tune, the Tuner uses a wideband sensor and listens for Knock and Ping/Pinking of the motor by adding loading on the dyno when working with the timing.
With proper monitoring and good tuning it should be quite safe.
xploding-twincam wrote:
I do think you are going about it a bit backwards. - Why? i have two options as i say , one is to use ZE 8.9 pistons to decompress or use a 1.6mm HG.
This is exactly my point. You have much more than two options. Your why in the sentence above is right before I explained why.
You need monitoring. You need to see if you can see the limits before you can know if you are at the limits. Trying to redesign the motor before knowing it needs it is going about it backwards.
I am also getting a little bit short tempered because you only seem to be half listening but not really grasping it. The other issue is that it seems as though you don't want to buy the monitoring equipment, you don't seem to want to tune it yourself or really learn enough to be able to understand it yourself.
You keep talking about taking it to a tuner but you keep asking what you can do to make it better.
If someone else is going to tune it then trust them and let them make the calls.
Otherwise do the research, buy the monitoring equipment, start learning the deeper ins and out for how and why everything works and then start pushing it.
Trying to let someone else tune it but trying to do other parts yourself is just asking for trouble.
Compression is not your first concern.
Get that out of your head till you address the other issues like your bad cam timing and having no way to monitor the system.
xploding-twincam wrote:
I agree thats with the tuning side i do know that, but all your facts are from your current setup,
My facts are from several of my own setups and watching and learning from many others setups.
I am running 11:1 compression at nearly .6 bar on a GZE ECU. My ability to tune compared to yours is like comparing a calculator to an old laptop. You may not have the best management but it's miles ahead of mine.
I have watched several people run more than .6 bar on 9.4:1 motors and stock ECUs and over a bar with aftermarket engine management.
I have watched several people boost silvertops running 10.5:1 compression and .8 to 1 bar boost.
xploding-twincam wrote:
I agree thats with the tuning side i do know that, but all your facts are from your current setup, im under the impression that my comp is to high and not good for boost , i do know that its the tune that breaks motors yes , but the margin for tuning safe and on the edge is based on what you bring to the table, smaller margin for error with a high comp motor then a low comp motor, am i making sense here?
Yes there is a smaller margin for error but what I am trying to explain is that with proper monitoring tools and 10.3:1 compression you have a much larger margin for error than with lower compression and no monitoring.
Personally if I was you I wouldn't drive it until you had a wideband and detcan.
Once you did I would fix the cam timing.
Next set the ignition timing very conservative.
Then take it out and start getting on the boost little bit by little bit listening for detonation.
With conservative timing don't get on it too hard too long because retarded timing can melt valves.
Once you confirm there is no detonation and once your AFRs are dialed in (you can keep it on the rich side for now) start advancing the timing little by little. If you hear a little knock through the detcan or whatever your monitoring device is then back it off slightly. As you start getting the timing a little more agressive you can start getting on it a little harder. From there you can start pushing it little by little.
Most people just aren't willing to throw down for three monitoring devices but if you also get a pyrometer you have all the important bases covered and you can really push the motor really safely. .6 bar with those three monitors will be rediculously safer than low compression with none or only one of the above.
Also don't get too caught up on how much boost. The higher compression will allow you to make more power at lower boost so maybe you can't run as much boost but .6 bar with 10.3:1 will probably make about as much power as 1 bar at 8.1:1. Not only that but the higher comp will give you better gas mileage, better off boost power, better response, better feel and much more pleasant driving experience.
