Mr. Eraths patent was a bit different than most.
His servo had an "ideal model" or "electrical equivalent" of a loud speaker in it.
His servo compared the original RCA input feed to the the output of the amplifier and looked for a difference. It ALSO in conjunction looked at the response of the "modeled" loudspeaker and compared that to the original signal. Then it made corrections based on both of those PLUS the "known parameters" of the actual loudspeaker being driven.
In the home I used a pair of Eminence 15's each in a 1.25 cf sealed enclosure which was flat down to 20 hz. Those are being replaced by dual Aluminum 10's.
In the car I used a pair of Parts Express 10" woofers in a 1 cf box. WAY MORE than flat to 20 Hz because of the cabin gain. Now I am using 8's in a .5 cf box. I will eventually get around to reducing the feedback of the servo to adjust for cabin gain. It just hasn't been a priority in life.
Again all my systems are for quality not quantity...
His servo had an "ideal model" or "electrical equivalent" of a loud speaker in it.
His servo compared the original RCA input feed to the the output of the amplifier and looked for a difference. It ALSO in conjunction looked at the response of the "modeled" loudspeaker and compared that to the original signal. Then it made corrections based on both of those PLUS the "known parameters" of the actual loudspeaker being driven.
In the home I used a pair of Eminence 15's each in a 1.25 cf sealed enclosure which was flat down to 20 hz. Those are being replaced by dual Aluminum 10's.
In the car I used a pair of Parts Express 10" woofers in a 1 cf box. WAY MORE than flat to 20 Hz because of the cabin gain. Now I am using 8's in a .5 cf box. I will eventually get around to reducing the feedback of the servo to adjust for cabin gain. It just hasn't been a priority in life.
Again all my systems are for quality not quantity...
Attachments
The place I was at in the late 80s sold stillwater boxes but I never saw the speakers. They were into kenwood, pioneer, RF pretty heavy and had LP and SS amps too. Used to sell a lot of phillips soft dome tweeters, they were nice. Had Boston Acoustics too had those in my car back then. Also sold yamaha mostly mids.
Troystg you would hate my car with four 12s IB.🙂
Troystg you would hate my car with four 12s IB.🙂
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
http://www.youtube.com/watch?v=6oI5jFgYHQw
Thank you and we were successful, firmly setting 2 landspeed records. In truth the car is unchanged in body (less a chopped top) from the windshield back (class requirement). Some people can still guess it was a Fiat!(has motorcycle motor, the Fiat motor could not make the HP).
Sorry for the thread hijacking!
I see it is a 'busa motor in the video, did it do the 179mph they say on the radio? Nice video, must have been a pile of fun!
The class is MS (modified sports). The motor is an "H" engine (1001-1532 cc) Non blown. We ran in the gas (my dad) and the fuel (me) classes
(gas is running the even supplied gas and fuel allows anything you want, we did however run event gas even in the fuel record).
You have to make 2 runs to set a record; 1 to qualify and then it must be backed up the next day. The record is the average of the 2 runs.
For safety reasons drivers must stage in different licenses to be allowed to run at higher speeds. My first run I was allowed to run between 125-150, after a safe run at that speed I could go to 175. We (my pop and I) had to lift to avoid violating the run speed.
Even though we lifted we set the records well past the current numbers. After backing up the second record we took the car to tech to have the engine displacement verified. With a plug removed we could clearly see that the motor was running on the lean side (I have now attributed it to low voltage to the fuel pump). Because we already set the records I felt it was not wise to risk a 27K$ motor going back out to really run the car (my only regret) I am confident the car would of went 180-190 on gas.
The records were
Old 133 to 158 (fuel)
Old 151 to 165 (gas)
The motors are Suzuki Hayabusa motorcycle motors
The big bore is:
1507cc making 248 WHP on gas and 350+ with spray.
The turbo motor is:
1300cc making 650-675 WHP, I will detune the motor to around 4-450HP. Currently we are in the build stages of the turbo motor.
It is my goal to exceed 205 MPH in the blown fuel and blown gas next year. This will put both my father and I in the famous 200 mph club. It is also my goal to not just break the record in the "H" engine class but to exceed the record in the next engine "G" (2000cc) with the smaller motor (221 and 217). My fathers record of 165 surpassed the G motors record of 163 (still you only get one record though!)
With the current coefficient of drag X frontal area (CdA) we should be able to achieve 230 MPH with about 375-425 hp.
(gas is running the even supplied gas and fuel allows anything you want, we did however run event gas even in the fuel record).
You have to make 2 runs to set a record; 1 to qualify and then it must be backed up the next day. The record is the average of the 2 runs.
For safety reasons drivers must stage in different licenses to be allowed to run at higher speeds. My first run I was allowed to run between 125-150, after a safe run at that speed I could go to 175. We (my pop and I) had to lift to avoid violating the run speed.
Even though we lifted we set the records well past the current numbers. After backing up the second record we took the car to tech to have the engine displacement verified. With a plug removed we could clearly see that the motor was running on the lean side (I have now attributed it to low voltage to the fuel pump). Because we already set the records I felt it was not wise to risk a 27K$ motor going back out to really run the car (my only regret) I am confident the car would of went 180-190 on gas.
The records were
Old 133 to 158 (fuel)
Old 151 to 165 (gas)
The motors are Suzuki Hayabusa motorcycle motors
The big bore is:
1507cc making 248 WHP on gas and 350+ with spray.
The turbo motor is:
1300cc making 650-675 WHP, I will detune the motor to around 4-450HP. Currently we are in the build stages of the turbo motor.
It is my goal to exceed 205 MPH in the blown fuel and blown gas next year. This will put both my father and I in the famous 200 mph club. It is also my goal to not just break the record in the "H" engine class but to exceed the record in the next engine "G" (2000cc) with the smaller motor (221 and 217). My fathers record of 165 surpassed the G motors record of 163 (still you only get one record though!)
With the current coefficient of drag X frontal area (CdA) we should be able to achieve 230 MPH with about 375-425 hp.
Not to insult you, but how do you have $27K in that motor?
Back to topic, I have loaned out 2 10" kickers from 1990 that even with departing foam, in a 1^3ft back per side hit 137db in my 1991 eclipse. With only an MTX pro 75 amp! Great speakers with excellent sound.
Back to topic, I have loaned out 2 10" kickers from 1990 that even with departing foam, in a 1^3ft back per side hit 137db in my 1991 eclipse. With only an MTX pro 75 amp! Great speakers with excellent sound.
Because:
!!!!Holy mother of Jeezus, that's 165HP per liter!!!
Almost 5HP per cubic inch!!!
On GAS!!
Unblown!!
AT THE WHEELS?? It wouldn't be out of line to lose 15% to drivetrain friction even with a smooth manual gearbox!
The attention to detail must be immense.
Jonny, I bow in reverence. Thanks for sharing.
Sorry for keeping this off topic, but that is noteworthy.
That hp level is not insane for the busa engines, there is a lot of aftermarket support for tuning and mods. There are a few guys in my area with over 300hp and they are still running the motors on their bikes.
The most HP I have seen from a NA busa was around 270 WHP. This is from a carpenter racing 1622 cc big bore (this displacement would put us into the next engine class). 240-250HP from a 1507 is doing well. This motor is not practically streetable and is not something you would want in a driver.
To make 300+ (and have it streetable) you will need a turbo or No2. My personal bike (turbo busa) is making 300+, however I have seen busas making over 700 WHP.
No insult brotha, I have asked myself that many times.
I mentioned to a friend that when I started this project I wanted to do a small bore class to keep the cost down. I told him that for what I have now in that little motor I could have an all aluminum blown big block motor!
He replied;
"Landracing will make you a small fortune....if you start with a BIG one!"
When you start putting together a motor like this, things add up real fast. THis also includes the injection computer (Bazzaz), data acquisition, water pumps (X2) and fuel system but when things like a crank cost 3k$ alone, it doent take long to rack up!
Thankfully I will be able to re-use many of the componets on the turbo motor (fuel system, cooling ect, bored TBs ect) and I am building much of the stuff myself to help with cost.
-JH
That was great, I got a good laugh from the pic.
BTW:
as far as being a daily driver the car needs to be pushed to about 35-40 MPH before it can move under its own power and has 8 degrees steering (a 50'+ turning radius!).
Hard to do in the city.
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