cjturbofd3s

iTrader: (2)

Just got my fd. I notice that when I floor it I can feel the boost at 4000 rpm but then the power seems to fade, also it has stock bov but it still real loud when i let off the gas. Is this normal?

djseven

iTrader: (56)

Sounds like a boost problem. Do you have a boost gauge? Helps alot in diagnosing the problem. And please give more details such as mods and actually anything you know about the car.

David

quicksilver_rx7

First thing you need is a boost gauge to make sure that the car is maintaining boost pressure at high RPM. Second, the stock B.O.V. releases air back to the air box via a black rubber hose. Typically, you cannot hear the B.O.V. unless that hose is unplugged. It's not going to matter about this hose unless the noise bothers you.

[EDIT]

Answered while I was typing

[/EDIT]

dgeesaman

iTrader: (7)

Hmm, does this 'fade' occur right at 4500rpm?

If you don't want to buy a boost gauge, at least borrow/buy a cheap pressure/vacuum gauge and some rubber line at Autozone. It'll be about $20 and useful for other things. If you get an Autometer boost gauge you're looking at maybe $40.

Then, if the boost gauge confirms that at 4500 the boost goes way down, it seems you have a secondary boost problem. Go to http://www.autosportracetech.com/RX-...leshooting.htm and follow that info.

Check the FAQ sticky thread at the top of the forum. It should tell about the standard 10-8-10 boost pattern and the 3rd gear test.

Dave