Hi All...
Still getting to know this little thing.. enjoying but curious...
I have a couple of intermittent strange problems / features...
1. Sometimes, when on lite throttle, boost guage reading around the zero mark the dump valve will open and then not close for a long time, manifold pressure will drop to - 10 / - 20... it will close when I push the throttle... but sometimes it's a bit sluggish to close / start to boost.
2. other times... and this is more annoying... when giving it some beans.. it will pull the same prank after a gear change.. basically driving N/A with all the boost blowing out of the dump valve, which will then close all of a sudden and WHOOOSH your flying again... it's not like its turbo lag as it starts boosting at about 1.5k.. and this would be happening in the 3 - 4k region... this seams worse with the traction control ON.
Is the above normal? is this the famous N249 in action.. and would I have even noticed it without a boost gauge?!?
I don't know if it was doing this before the gauge was fitted.. and I swapped the dump valve for a Forge 006 at the same time as fitting the gauge... no leaks that I can find.. I have plumbed it in the right way round tho (as forge / the laws of physics say it should be) rather than the standard (wrong IMO) way...
Car does boost well... bang on 9psi in third on hills (and stablises very quickly) .. 7ish with less load and 5psi when driving normally (although I tend to drive without any boost atall most of the time.. got 280 miles / 30+ mpg from the last tank woohoo!)
Cheers,
Adam.
Still getting to know this little thing.. enjoying but curious...
I have a couple of intermittent strange problems / features...
1. Sometimes, when on lite throttle, boost guage reading around the zero mark the dump valve will open and then not close for a long time, manifold pressure will drop to - 10 / - 20... it will close when I push the throttle... but sometimes it's a bit sluggish to close / start to boost.
2. other times... and this is more annoying... when giving it some beans.. it will pull the same prank after a gear change.. basically driving N/A with all the boost blowing out of the dump valve, which will then close all of a sudden and WHOOOSH your flying again... it's not like its turbo lag as it starts boosting at about 1.5k.. and this would be happening in the 3 - 4k region... this seams worse with the traction control ON.
Is the above normal? is this the famous N249 in action.. and would I have even noticed it without a boost gauge?!?
I don't know if it was doing this before the gauge was fitted.. and I swapped the dump valve for a Forge 006 at the same time as fitting the gauge... no leaks that I can find.. I have plumbed it in the right way round tho (as forge / the laws of physics say it should be) rather than the standard (wrong IMO) way...
Car does boost well... bang on 9psi in third on hills (and stablises very quickly) .. 7ish with less load and 5psi when driving normally (although I tend to drive without any boost atall most of the time.. got 280 miles / 30+ mpg from the last tank woohoo!)
Cheers,
Adam.
what he said
