Losing Pressure

[Bigg Boy]

Okay I am just about stumped on this one. I am doing almost the same score at half volume as I am at full volume.

Only think I can think of is when I burp at half volume my rear hatch flexes but isnt too bad. When I burp at full tilt i can literally feel the air come out from the hatch flexing like 5 ft away.

I am decently happy with my score, but I feel I could get alot louder with out all the flexing.

Beside moving the latch so it closes tight (already done) is there any thing you guys would suggest. I don't care how loud it is out side, I am trying to contain as much pressure as I a can.

No cement!

[uluahunta808]

dampener and great stuff sprayed in the hatch. try replace the runner seals maybe there all cracked and buss

[matt402]

u check for clippage yet?

brace the hell outta it and maybe add new latches and gaskets.

[Bigg Boy]

back hatch is about as deadened as it can get, almost 30sq feet of dynamat, and I dont see how spray foam will help, metal isnt flexing, the hatch it self as a whole is.

And if your talking about the weather stripping is good as new.

[Bigg Boy]

u check for clippage yet?

brace the hell outta it and maybe add new latches and gaskets.

Voltage is crap at full tilt, but i don't think it clipping, but even if I am i am still losing alot of pressure.

How would you suggest bracing it?

Maybe a Linear actuator? to pull the hatch real tight?

Edited November 30, 2009 by Bigg Boy

[chewie]

if voltage is crap at full tilt then your loosing power on top of pressure.. take a buddy with you and have him press against the glass during metering.

[Bigg Boy]

tried that didn't do much, not much you can holding it does, plus we where pushing so hard I am afraid of denting it.

I am waiting on getting my new alts in to correct voltage

Edited November 30, 2009 by Bigg Boy

[chewie]

well if your pushing on the hatch where its flexing and loosing pressure then your not loosing pressure anymore from that area so your lack of db increase is due to your voltage drop/box rise and your amp making less power.

Edited November 30, 2009 by chewie

[Bigg Boy]

I am saying even with pushing on the hatch, you still can't keep the pressure from escaping out between the hatch.

I know my voltage is alot a problem, but I cant fix that intil I get my alts in.

I really liking the actuator idea to shut the hatch, then pull it super tight. might be worth a try

Edited November 30, 2009 by Bigg Boy

[Nightshade]

Your not losing that much pressure from your hatch. I can burp my ZX3 with the hatch not even completely latched and I only drop by about .7db's. I found this out because there are some little rubber stopper type things on my hatch that were sticking out way too far from vibration I guess and didn't allow the hatch to completely close. Once I tighetend them back up the score jumped up by .7 db.

I would also be willing to bet that since your volatge is dropping so low that is what is not letting you achieve the output you should be. What does your voltage drop to when you burp the car? What amps are you running and what does the electrical consist of? If you say stock alternator and you are running over 3K watts then I promise you that is the first thing you need to address more than some air leaking out the hatch.