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1st, 2nd, .....15th impressions on CGT car.

 
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Grenadiers  



Joined: 20 Feb 2007
Posts: 3222
Location: Nelson, WI & Prescott, AZ

PostPosted: Fri May 17, 2013 6:00 am    Post subject: 1st, 2nd, .....15th impressions on CGT car. Reply with quote

Well, after a winter of despair of having no running 931 car in Arizona, the CGT project is mechanically pretty much done. In Arizona, I rewired the car with a Painless Wiring 12 circuit fuse box and 8 circuit toggle switch box with starter button. Also, utilized MSII and EDIS for ignition. Have brake lights, GTS front lights, turn signals and wipers.

The engine I put in last fall 'looked' good, no oil on engine, pretty shiny! Anyway, after all of the above was completed, the car started right up, but blew clouds of blue smoke. Arghghghghg. After effing with it for a couple more months, waste of time, I shut down the project for 4 months. Didn't hardly look at it.

Now that I have the rebuilt spare engine in it, the car hauls ass quite well. It's a Series I engine with new crank and rod bearings, new rings, new cam, followers, valves, etc. Eventually, I'll rebuild the Series I engine and Euro turbo-charger, and have that as my 'spare'. Or sooner~!

Anyway, long story short, have a question. The car is pretty much all metal, no plastic or carpet, etc. I think I'll go deaf driving this thing~! One particular noise that bothers me, regardless of overall decibel level, is this
'banshee' screaming sounding noise coming at high rpm when I let off the gas. Ouch! Is it the wastegate? The exhaust is tighter than a crab's ass, so doubt there's any rattle with that. The car shifts great, nice and tight. What up?

Otherwise, wow, with the near-race suspension, and wider 944 track, wow, and the R888s, wow, amazing, nothing I've ever driven like this, including the old 911. Just like a go cart going around corners. I like!
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'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
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v8carreragts  



Joined: 05 Sep 2003
Posts: 665
Location: Tucson, AZ

PostPosted: Fri May 24, 2013 9:59 am    Post subject: Reply with quote

You are probably hearing resonance through the sheet metal which kind of amplifies the sound--like a speaker cone does. I would suggest getting some sound deadening material (like Dynamat) and place a few squares around the floor and inside of the 1/4 panels. You don't need to cover everything. Just put maybe a 12" x 12" square on each 1/4 panel and start with one on the rear floor. You will be surprised what a small amount will do and it wouldn't add much weight either. Eastwood has their own brand on sale for $20 for a pack of 5 12" squares.

All you need to do is dampen the sheet metal vibrations.
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84 944--924 Carrera GTS clone w/520HP Chevy 302 V8--RUNNING!
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Paul  



Joined: 02 Nov 2002
Posts: 9430
Location: Southeast Wisconsin

PostPosted: Sat May 25, 2013 2:04 pm    Post subject: Reply with quote

The sound you are hearing when you let off the gas is not the wastegate,more likely the pop off valve on the turbo.
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
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Grenadiers  



Joined: 20 Feb 2007
Posts: 3222
Location: Nelson, WI & Prescott, AZ

PostPosted: Sat May 25, 2013 9:37 pm    Post subject: Reply with quote

Correct on both accounts! I sealed up the spare tire hole, and no more noise.
_________________
'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke
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