18psi my butt!! you trying to wear out the turbo.
your 87 2.3T should put out 200hp.
Remove knock sensor, be sure to listen for detonation and use premium gas.
Remove restrictive airbox and put a k&n on or any cone filter.
3" down pipe
port/polish upper/lower air intake manifold
also port don't polish the exhaughst manifold.
get a boost controller you can get these under $100,this will give you higher boost say 16.5-17psi.
engle 55 cam
also go to this site it has tons of info under the FAQ link
www.turboford.org
and also subscribe the mailing list, you want to make a seperate folder for all the turbo mail and be sure to have you mail filters on.
any more questions, just ask.
Brad.
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