I'm finally boosted
#1
I'm finally boosted
I got tired of giving lame excuses about not finishing my SC install because I'm too busy on weekends, so I left work at lunch yesterday and finished the job. I'm still checking EGTs and fuel pressure and tweaking the BOV adjustment, so I haven't done a WOT run to redline yet, but so far there is nothing but a smile on my face.
My setup: V1 blower, 3.25" pulley, 8:1 disk, Walbro 255lph pump in tank, Blitz DD BOV, one step colder plugs
I do have a few questions, though.
I did a WOT run yesterday and shut it down after a few seconds because I heard a rattling that sounded like detonation at about 4500-5000 rpm. EGT was only about 1300F at the time. When I let off the throttle the rattling continued, which makes me think it was just BOV noise and not detonation. Still, it was a bit scary and it's making me very cautious. I had the BOV adjusted with very little if any preload in the spring. What do you think? Just BOV noise because it was set to release pressure at a fairly low boost pressure? Is it possible to have detonation at 1300F EGT? (My EGT probe is a couple of inches below the front O2 sensor.)
How do you determine the optimal setting for the BOV preload spring?
My setup: V1 blower, 3.25" pulley, 8:1 disk, Walbro 255lph pump in tank, Blitz DD BOV, one step colder plugs
I do have a few questions, though.
I did a WOT run yesterday and shut it down after a few seconds because I heard a rattling that sounded like detonation at about 4500-5000 rpm. EGT was only about 1300F at the time. When I let off the throttle the rattling continued, which makes me think it was just BOV noise and not detonation. Still, it was a bit scary and it's making me very cautious. I had the BOV adjusted with very little if any preload in the spring. What do you think? Just BOV noise because it was set to release pressure at a fairly low boost pressure? Is it possible to have detonation at 1300F EGT? (My EGT probe is a couple of inches below the front O2 sensor.)
How do you determine the optimal setting for the BOV preload spring?
#2
Re: I'm finally boosted
Originally posted by Stephen Max
I got tired of giving lame excuses about not finishing my SC install because I'm too busy on weekends, so I left work at lunch yesterday and finished the job. I'm still checking EGTs and fuel pressure and tweaking the BOV adjustment, so I haven't done a WOT run to redline yet, but so far there is nothing but a smile on my face.
My setup: V1 blower, 3.25" pulley, 8:1 disk, Walbro 255lph pump in tank, Blitz DD BOV, one step colder plugs
I do have a few questions, though.
I did a WOT run yesterday and shut it down after a few seconds because I heard a rattling that sounded like detonation at about 4500-5000 rpm. EGT was only about 1300F at the time. When I let off the throttle the rattling continued, which makes me think it was just BOV noise and not detonation. Still, it was a bit scary and it's making me very cautious. I had the BOV adjusted with very little if any preload in the spring. What do you think? Just BOV noise because it was set to release pressure at a fairly low boost pressure? Is it possible to have detonation at 1300F EGT? (My EGT probe is a couple of inches below the front O2 sensor.)
How do you determine the optimal setting for the BOV preload spring?
I got tired of giving lame excuses about not finishing my SC install because I'm too busy on weekends, so I left work at lunch yesterday and finished the job. I'm still checking EGTs and fuel pressure and tweaking the BOV adjustment, so I haven't done a WOT run to redline yet, but so far there is nothing but a smile on my face.
My setup: V1 blower, 3.25" pulley, 8:1 disk, Walbro 255lph pump in tank, Blitz DD BOV, one step colder plugs
I do have a few questions, though.
I did a WOT run yesterday and shut it down after a few seconds because I heard a rattling that sounded like detonation at about 4500-5000 rpm. EGT was only about 1300F at the time. When I let off the throttle the rattling continued, which makes me think it was just BOV noise and not detonation. Still, it was a bit scary and it's making me very cautious. I had the BOV adjusted with very little if any preload in the spring. What do you think? Just BOV noise because it was set to release pressure at a fairly low boost pressure? Is it possible to have detonation at 1300F EGT? (My EGT probe is a couple of inches below the front O2 sensor.)
How do you determine the optimal setting for the BOV preload spring?
#3
Re: I'm finally boosted
Update: I increased the BOV preload and did a few runs during lunchtime. The scary rattle is gone, so it must have been the BOV releasing boosted air at a low boost pressure.
#5
Congrats on the install!
1300 F = 700 C (my gauge goes by celcius) and at 700 C, you are not leaning out.
just wondering...do you have a full free flow exhaust? Because I dont and my EGT raises very fast. Probably because my cat-back is way to restrictive and it takes forever to release hot fart.
Do you have a boost gauge? what psi do you read at redline?
1300 F = 700 C (my gauge goes by celcius) and at 700 C, you are not leaning out.
just wondering...do you have a full free flow exhaust? Because I dont and my EGT raises very fast. Probably because my cat-back is way to restrictive and it takes forever to release hot fart.
Do you have a boost gauge? what psi do you read at redline?
#6
Originally posted by [maxi-overdose]
Congrats on the install!
1300 F = 700 C (my gauge goes by celcius) and at 700 C, you are not leaning out.
just wondering...do you have a full free flow exhaust? Because I dont and my EGT raises very fast. Probably because my cat-back is way to restrictive and it takes forever to release hot fart.
Do you have a boost gauge? what psi do you read at redline?
Congrats on the install!
1300 F = 700 C (my gauge goes by celcius) and at 700 C, you are not leaning out.
just wondering...do you have a full free flow exhaust? Because I dont and my EGT raises very fast. Probably because my cat-back is way to restrictive and it takes forever to release hot fart.
Do you have a boost gauge? what psi do you read at redline?
Last night I saw 9 psi at redline and the EGT was at 1400F . There was just a hint of raggedness in the firing, I think I may need to adjust the spark plug gap a couple of thousandths.
#7
Originally posted by Stephen Max
I do have a test pipe and cat back,
I do have a test pipe and cat back,
#8
Originally posted by Stephen Max
I do have a test pipe and cat back, but I uninstalled it and put the cat and stock b-pipe back on in order to pass inspection last month. That's going back on this weekend if it doesn't rain. Once I get the cat back on I'll have it dyno'd.
Last night I saw 9 psi at redline and the EGT was at 1400F . There was just a hint of raggedness in the firing, I think I may need to adjust the spark plug gap a couple of thousandths.
I do have a test pipe and cat back, but I uninstalled it and put the cat and stock b-pipe back on in order to pass inspection last month. That's going back on this weekend if it doesn't rain. Once I get the cat back on I'll have it dyno'd.
Last night I saw 9 psi at redline and the EGT was at 1400F . There was just a hint of raggedness in the firing, I think I may need to adjust the spark plug gap a couple of thousandths.
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