991 GT3 engine
Discussion
Adrian-9iafn said:
Hi all,
Still getting to know my GT3, is it normal to have some harshness at 4.0-4.25k rpm, very smooth and sweet to 3.5k then there is a little harshness/vibration around 4k, which disappears by 4.3k. Just checking this is normal, sweat below and above
991.1 or 991.2 GT3....?? Can only comment on the latter, which makes no such noise iirc.....Still getting to know my GT3, is it normal to have some harshness at 4.0-4.25k rpm, very smooth and sweet to 3.5k then there is a little harshness/vibration around 4k, which disappears by 4.3k. Just checking this is normal, sweat below and above
Adrian-9iafn said:
Thanks, it seems just before the exhaust valves open, I will be taking the car to JZM for a suspension set up I'll see what they think, might be something loose somewhere, although it does feel like the engine causing it rather than something vibrating through being loose
Disconnect the valves which is a two minute job and see if problem is solved.I haven't been able to solve this problem. no one seems to think there is anything wrong. I think I need to drive another GT3 and see how it compares to another 991.1 GT3
I have been ignoring it and enjoying the car, but it's starting to annoy me again. definitely at 4k the harshness comes in. I have been driving through it. How do you disconnect the valves on the exhaust ?
I have been ignoring it and enjoying the car, but it's starting to annoy me again. definitely at 4k the harshness comes in. I have been driving through it. How do you disconnect the valves on the exhaust ?
Adrian-9iafn said:
I haven't been able to solve this problem. no one seems to think there is anything wrong. I think I need to drive another GT3 and see how it compares to another 991.1 GT3
I have been ignoring it and enjoying the car, but it's starting to annoy me again. definitely at 4k the harshness comes in. I have been driving through it. How do you disconnect the valves on the exhaust ?
If it's the same operating principal as the 997.2 PSE, the easiest way to disable DME controlling the valves and keep the valves open (i.e. loud), is to disconnect the electrical connector on the vacuum solenoid valve. Don't ask me where that is on the 991 GT3 but on the 997.2 its on the RHS of the intake manifold.I have been ignoring it and enjoying the car, but it's starting to annoy me again. definitely at 4k the harshness comes in. I have been driving through it. How do you disconnect the valves on the exhaust ?
Surely a GT3 is all about Noise, Vibration and Harshness?? It's in its DNA 
All GT3's and RS that I have owned have made noises from all areas, engine and drivetrain included. Not saying that you don't have a specific issue, but noise is what the car is all about.
If in doubt, then get your local OPC to check, as your engine has a 10 year warranty
All GT3's and RS that I have owned have made noises from all areas, engine and drivetrain included. Not saying that you don't have a specific issue, but noise is what the car is all about.
If in doubt, then get your local OPC to check, as your engine has a 10 year warranty
terryb said:
Surely a GT3 is all about Noise, Vibration and Harshness?? It's in its DNA
All GT3's and RS that I have owned have made noises from all areas, engine and drivetrain included. Not saying that you don't have a specific issue, but noise is what the car is all about.
If in doubt, then get your local OPC to check, as your engine has a 10 year warranty
A big plus 1..All GT3's and RS that I have owned have made noises from all areas, engine and drivetrain included. Not saying that you don't have a specific issue, but noise is what the car is all about.
If in doubt, then get your local OPC to check, as your engine has a 10 year warranty
I wouldn’t worry too much. My Gen1 made different noises on all different drive outs.
But check in with a OPC, due to it having the 10yr warranty....
Adrian-9iafn said:
I haven't been able to solve this problem. no one seems to think there is anything wrong. I think I need to drive another GT3 and see how it compares to another 991.1 GT3
I have been ignoring it and enjoying the car, but it's starting to annoy me again. definitely at 4k the harshness comes in. I have been driving through it. How do you disconnect the valves on the exhaust ?
I'd have thought JZM would have been able to diagnose this for you....they must have had an awful lot of 991.1's either through their showroom or workshop by now! What did they say ?I have been ignoring it and enjoying the car, but it's starting to annoy me again. definitely at 4k the harshness comes in. I have been driving through it. How do you disconnect the valves on the exhaust ?
Interesting I agree, they did take it out for the suspension test and found no issues, but the time there was more about suspension settings.
I remain surprised this harshness hasn't been commented on, even in passing. It is as notifiable as the amazing shriek at 8,500 - 9,000 rpm. The diff chatter is noted and much less obtrusive than in something like my old 964 RS and less 'irritating' than the 4k harshness.
I will try the exhaust but don't think it's that. I will try to take another 991.1 out and really see for myself !
I remain surprised this harshness hasn't been commented on, even in passing. It is as notifiable as the amazing shriek at 8,500 - 9,000 rpm. The diff chatter is noted and much less obtrusive than in something like my old 964 RS and less 'irritating' than the 4k harshness.
I will try the exhaust but don't think it's that. I will try to take another 991.1 out and really see for myself !
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