My High End Power Sucks!

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11-30-2002, 01:42 AM

rotary>piston

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Join Date: Sep 2002

Posts: 282

Hey, I've got an 89 n/a. The high end power (6500-8000) Really sucks. At the moment, I've determined that the VDI system is working properly (it moves and opens at the right rpm), and my actuators are open from 3000 rpm and up. Are there any other systems that up high end power on the car that could be broken? Could low compression be to blame? The car has 146000 miles, but feels pretty strong. Also, if I do a compression test, what kind of compression is "good"?

11-30-2002, 01:44 AM

1Revvin7

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Join Date: Oct 2001

Location: Peoria, AZ

Posts: 10,906

could be compression, anywhere above 90 is good, but excellent is above 125. vacuum leaks cuz power loss also.

11-30-2002, 01:45 AM

UniqueTII

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Join Date: Nov 2001

Location: Ames, IA

Posts: 4,773

Hmmm...my first guess was a cat, but that's not the case. My TII had a problem with high end power when there was air in the cooling system.

11-30-2002, 01:46 AM

1Revvin7

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Location: Peoria, AZ

Posts: 10,906

Quote:

Originally Posted by UniqueTII' date='Nov 30 2002, 02:45 AM

Hmmm...my first guess was a cat, but that's not the case. My TII had a problem with high end power when there was air in the cooling system.

wow how would that affect power??? hmm interesting.....

11-30-2002, 01:52 AM

UniqueTII

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Location: Ames, IA

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I think it was kinda overheating when the boost was up there...trust me, it took RD and me forever to figure out the problem!

I wonder if the stock knock sensor was retarding the timing or something.

11-30-2002, 01:55 AM

1Revvin7

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Location: Peoria, AZ

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crazy ****. i believe you sometimes the simplest **** can upset everthing. So how did you get rid of the air?

11-30-2002, 01:57 AM

UniqueTII

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Location: Ames, IA

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The bleeder valve...it was stripped, so I hadn't been bleeding the air out (after having a coolant leak) but after that, we crammed a screwdriver in there to get it out. You'd think I would have just bought the $7 part.

Not all TIIs have the bleeder...I think it may be different for S4s and S5s, but I'm not sure. I just know that 1revin7's TII doesn't have one.

11-30-2002, 01:57 AM

Ni5mo180SX

Junior Member

Join Date: Nov 2002

Location: Orange County, CA

Posts: 25

Its hard to say why youd have bad top end power with your mods. You sure your 6 ports are working? Only other thing I can suggest is make sure everythings tuned up i.e. plugs, fuel filter etc......