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  #1  
Old 01-11-2009, 06:12 PM
range rover range rover is offline
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Default how do I bulid more boost on hot air car?

1985 hot air need to build more boost only have 5lb need 20lb . any body know how ?
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Old 01-12-2009, 11:52 AM
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Default Re: how do I bulid more boost on hot air car?

Look for and fix the problem first ... I'd suggest:
  1. Check headers, crossover, uppipe to turbo for any leaks (especially at joints/flanges). The hot air cars are notorious for splits in the uppipe to the turbo too.
  2. Check for shaft play in the turbo. It could be the turbo is bad/failing.
  3. Check for leaks at the O ring going into the top of the manifold.
  4. Check for blocked/collapsed (internally) cat converter. This can dramatically reduce boost/performance.
  5. Check the wastegate and actuator for sticking/poor seal (which leaks boost)
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Old 01-12-2009, 07:42 PM
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Default Re: how do I bulid more boost on hot air car?

do you have an aftermarket gauge?
Any exhaust leaks?
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Old 01-13-2009, 07:12 PM
range rover range rover is offline
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Red face Re: how do I bulid more boost on hot air car?

thanks for info ,I will check everything posted, and get back.I ran car at track took off hard and then alot of black smoke out of down pipe. no muffler or cat. have boost gage. I am new with turbo cars and think GN's kick but and look good doing it. I hope I can get mine to go!
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Old 01-13-2009, 10:47 PM
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Question Re: how do I bulid more boost on hot air car?

Do you have an adjustable fuel pressure regulator? The black smoke almost sounds like its cranked up too high.

Are you reading boost on the dash gauge or an aftermarket one?
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Old 01-14-2009, 07:10 PM
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Unhappy Re: how do I bulid more boost on hot air car?

I have ajustable fuel regulator , but I did not buy new and I have used fuel injectors. I am going to install new ones and see what happens, I have a new fuel regulator to. the seems to run strong cold but when it warms it runs rough.no back fire just up and down like vacum leak but I can't find one
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Old 01-14-2009, 11:51 PM
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Exclamation Re: how do I bulid more boost on hot air car?

Note that your chip needs to be matched to your fuel injectors. I'd also suggest you update to the ECM used in the 86/87 cars, which gives you access to a larger selection of matching chips from more sources.

You should also get a fuel pressure gauge so that you can adjust your fuel pressure properly.

...and a scan tool so you can really tell what the car is doing.
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Old 01-15-2009, 07:05 PM
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Wink Re: how do I bulid more boost on hot air car?

thanks for the info . I will look into it and get back to you . do I need to change my coil pack and wire harness? I have a ecm from 86-87 car I bought on ebay .I plan on getting a scanmaster. and good?
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Old 01-15-2009, 07:27 PM
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Exclamation Re: how do I bulid more boost on hot air car?

A few small changes are needed. See the articles on the web site such as http://www.gnttype.org/techarea/ecmsensors/8487ecm.html and http://www.gnttype.org/techarea/ignition/module.html
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Old 01-15-2009, 07:29 PM
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Lightbulb Re: how do I bulid more boost on hot air car?

Quote:
Originally Posted by range rover View Post
do I need to change my coil pack and wire harness? I have a ecm from 86-87 car I bought on ebay
Nope. But you'll need to add the air temperature sensor or stub it. Caspers has a dandy kit for adding the sensor. And you'll need the 86-87 MAF or a translator + appropriate MAF.
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