engine noises
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Joined: Jun 2001
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From: Where I am
engine noises
Mike
Tho' I sure can't complain about the power with the 4# pulley and superchip, the engine sure seems a lot noiser. A Noise seems to be coming from the blower (rumbling)and it whines at all rpm, even decelleration. Is that to be expected?
Tho' I sure can't complain about the power with the 4# pulley and superchip, the engine sure seems a lot noiser. A Noise seems to be coming from the blower (rumbling)and it whines at all rpm, even decelleration. Is that to be expected?
Former Sponsor
Joined: Mar 1998
Posts: 13,385
Likes: 4
From: Virginia
Hi Dr. D,
By now we've already gone over this in email, but yes, that is perfectly natural with any Roots-type blower when you increase the boost level. You're turning the supercharger faster, so you will increase blower whine. It's mostly apparent under load, and the more load the motor is under, the more you will hear it. Perfectly normal. Your stock boost level is only 8 PSI, which is very low for that supercharger, Jaguar is using those Eaton blowers at 13.1 PSI lately, and that's in bone-stock trim, right from the factory.
If you have a good combination boost/vacuum gauge (or you can just take a gander at the crappy factory boost/vacuum gauge), you will see that under normal cruising conditions, you are still way into vacuum. Your Eaton M112 blower is a 4th generation model, so it has the bypass valve for when you're cruising (not under load), to reduce the blower drag to almost nothing during cruising conditions. That makes it a lot more fun to turn up the wick (boost), as you're not being "penalized" when cruising, yet when you put the motor under load, you have a lot more torque available RIGHT NOW.
By the time you are at full-throttle, the blower's whine will be the only thing you hear; no exhaust, no tires being turrned into dust, nothing but the beautiful howl of that Eaton supercharger.
Just as it should be.
By now we've already gone over this in email, but yes, that is perfectly natural with any Roots-type blower when you increase the boost level. You're turning the supercharger faster, so you will increase blower whine. It's mostly apparent under load, and the more load the motor is under, the more you will hear it. Perfectly normal. Your stock boost level is only 8 PSI, which is very low for that supercharger, Jaguar is using those Eaton blowers at 13.1 PSI lately, and that's in bone-stock trim, right from the factory.
If you have a good combination boost/vacuum gauge (or you can just take a gander at the crappy factory boost/vacuum gauge), you will see that under normal cruising conditions, you are still way into vacuum. Your Eaton M112 blower is a 4th generation model, so it has the bypass valve for when you're cruising (not under load), to reduce the blower drag to almost nothing during cruising conditions. That makes it a lot more fun to turn up the wick (boost), as you're not being "penalized" when cruising, yet when you put the motor under load, you have a lot more torque available RIGHT NOW.
By the time you are at full-throttle, the blower's whine will be the only thing you hear; no exhaust, no tires being turrned into dust, nothing but the beautiful howl of that Eaton supercharger.
Just as it should be.
Former Sponsor
Joined: Mar 1998
Posts: 13,385
Likes: 4
From: Virginia
Hi Dr. D.,
Great, do let us know what you turn @ MIR. Getting traction off the starting line can be an issue (which will show in your 60 ft. time), if they don't have any VHT laid down on the launch pad, you'll have a lot of tire spin.
I don't remember from our discussions if you have been to the track before with your Lightning, but just in case, a couple of very simple tips with these huge torque producers...............Turn the Overdrive off but let it shift automatically, stage shallow & launch at idle; put the hammer down on the next to last yellow & hang on!
Good luck!
Great, do let us know what you turn @ MIR. Getting traction off the starting line can be an issue (which will show in your 60 ft. time), if they don't have any VHT laid down on the launch pad, you'll have a lot of tire spin.
I don't remember from our discussions if you have been to the track before with your Lightning, but just in case, a couple of very simple tips with these huge torque producers...............Turn the Overdrive off but let it shift automatically, stage shallow & launch at idle; put the hammer down on the next to last yellow & hang on!
Good luck!
