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TheRedSlantnose's Avatar
 
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Porsche Crest Do I need a front spoiler?

My 930 Slant has a "Yellowbird" style bumper, but unlike the Yellowbird itself, it doesn't have the rubber lip underneath. Does my car need that rubber lip or is the bumper itself already a front spoiler? The front end of my car also feels light whenever I accelerate, so I think I have some amount of lift at the front, but would there be any significant difference if I was to add the rubber lip?

Here's the clearest photo I have of the front of my car for a better visualization of the bumper (with a Speedster ):



Thanks,

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Jason

1987 930 Slantnose Cabriolet, 545 hp, Guards Red- Weekend cruiser
1986 944 Turbo (951), 350+hp, Guards Red- Track car
2005 Toyota Tundra SR5 Double Cab 4x4, stock 282 hp, Silver- Daily driver
Old 03-21-2014, 06:17 PM
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I have the same spoiler. My car is too low for the lip... Wouldn't last 1k miles in Louisiana... And, I like driving mine - - just got back from a night out in it as I type...
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LIVN80S - - Red '79 Porsche 930 Steel Slant Nose Conversion [in 1987] w. 46k miles 3.3L; 964 Cams; K27HF @ 1.0 BAR, with Garrettson Intercooler; Rarly Zork; CIS Flowtech Fuel Head & BL-WUR.
Old 03-21-2014, 06:51 PM
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Though you may not like it, I have a black conveyor belt as a front spoiler on my CTR type bumper. You can cut it so nobody knows it came from tractor supply co, seriously.

It is flexible and works fine
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Old 03-21-2014, 07:02 PM
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Quote:
Originally Posted by jsveb View Post
Though you may not like it, I have a black conveyor belt as a front spoiler on my CTR type bumper. You can cut it so nobody knows it came from tractor supply co, seriously.

It is flexible and works fine
Would it flap around at speed?
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Jason

1987 930 Slantnose Cabriolet, 545 hp, Guards Red- Weekend cruiser
1986 944 Turbo (951), 350+hp, Guards Red- Track car
2005 Toyota Tundra SR5 Double Cab 4x4, stock 282 hp, Silver- Daily driver
Old 03-21-2014, 07:11 PM
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Quote:
Originally Posted by mooney265 View Post
I have the same spoiler. My car is too low for the lip... Wouldn't last 1k miles in Louisiana... And, I like driving mine - - just got back from a night out in it as I type...
In that case, I think my car may be too low for the lip as well because whenever the road is uneven and I don't drive slow enough, some brackets at the bottom of the bumper scrape the ground, but fortunately it doesn't mess up my paint.
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Jason

1987 930 Slantnose Cabriolet, 545 hp, Guards Red- Weekend cruiser
1986 944 Turbo (951), 350+hp, Guards Red- Track car
2005 Toyota Tundra SR5 Double Cab 4x4, stock 282 hp, Silver- Daily driver
Old 03-21-2014, 07:19 PM
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I bet that would be your tow hooks underneath. Mine scrape on my driveway from time to time.
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Old 03-21-2014, 07:55 PM
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Quote:
Originally Posted by TheRedSlantnose View Post
Would it flap around at speed?
It doesn't flap. It is heavy duty, and I have used a flat piece of alu to reinforce it on the backside where it mounts to the bumper.
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Carrera 3.0 1975
930 1978 OEM Matte Schwartz, ANDIAL IC, BL WUR, SC cams. LMA-3 w. XD-16 and CP transducer
www.stauningwhisky.dk
Old 03-21-2014, 07:56 PM
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here is my before pic of the front with no lip. I tried two options.



1) i tried modifying as lip from an SC. I found it was too deep and positioned too far back. this caused scrapping and was too low for my liking.

2) the next lip i tried was from an early VW Jetta. It positions a little higher and farther forward than the SC. This worked for me. pic of jetta lip below



the last pic shows the lip from the back side. it does not lower the overall very much and scrapping is minimal.



this lip reduced the front end lift.
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81 930 Turbo RoW, Slantnose, 3.5 twin plug dual MSD 6AL ignition, MSD RPM Activated boost rdelay switch set at 4400, MSD Tach Adapter, BL Wur, 18x11 (315-30-18) and 18x8 (235-35-18), Fab speed exhaust, Innovate MTX, K&N Filter Mod., NGK BPR7EIX and DPR7EIX plugs, KEP Stage II PP with Street/Race Organic Disk., Weltmiester Swaybars, Adjustable AAR Mod, AAV Delete
Old 03-21-2014, 09:43 PM
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Quote:
Originally Posted by Bob930slant View Post
here is my before pic of the front with no lip. I tried two options.



1) i tried modifying as lip from an SC. I found it was too deep and positioned too far back. this caused scrapping and was too low for my liking.

2) the next lip i tried was from an early VW Jetta. It positions a little higher and farther forward than the SC. This worked for me. pic of jetta lip below



the last pic shows the lip from the back side. it does not lower the overall very much and scrapping is minimal.



this lip reduced the front end lift.
What did you use to mount it and do you know what model year Jetta that was off of? I might try that out.
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Jason

1987 930 Slantnose Cabriolet, 545 hp, Guards Red- Weekend cruiser
1986 944 Turbo (951), 350+hp, Guards Red- Track car
2005 Toyota Tundra SR5 Double Cab 4x4, stock 282 hp, Silver- Daily driver
Old 03-22-2014, 08:40 AM
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I'm partial to without:
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LIVN80S - - Red '79 Porsche 930 Steel Slant Nose Conversion [in 1987] w. 46k miles 3.3L; 964 Cams; K27HF @ 1.0 BAR, with Garrettson Intercooler; Rarly Zork; CIS Flowtech Fuel Head & BL-WUR.
Old 03-23-2014, 12:37 PM
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I mounted it with hardware from an SC. I will check after work today for the serial number on the back of the part and post it.
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81 930 Turbo RoW, Slantnose, 3.5 twin plug dual MSD 6AL ignition, MSD RPM Activated boost rdelay switch set at 4400, MSD Tach Adapter, BL Wur, 18x11 (315-30-18) and 18x8 (235-35-18), Fab speed exhaust, Innovate MTX, K&N Filter Mod., NGK BPR7EIX and DPR7EIX plugs, KEP Stage II PP with Street/Race Organic Disk., Weltmiester Swaybars, Adjustable AAR Mod, AAV Delete
Old 03-23-2014, 01:37 PM
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i have a ruf yellowbird front spoiler with the rubber underlip. it is a little bit different than the one on your car. i have never run the car without the lip so i dont know if it makes a difference. as is, it seems to work fine for some moderately high speeds!
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Old 03-26-2014, 11:09 AM
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I believe you do, to compensate for the rear spoiler; however, some people think that the slant configuration creates enough down force so the chin spoiler is not need it. Again I believe you do, in addition that it dresses the whole front of the car. M2c.
Old 03-26-2014, 12:32 PM
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sorry it tool so long. the spoiler that i used was a Front lower deep spoiler valance VW Golf Jetta MK2. here is a pic


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81 930 Turbo RoW, Slantnose, 3.5 twin plug dual MSD 6AL ignition, MSD RPM Activated boost rdelay switch set at 4400, MSD Tach Adapter, BL Wur, 18x11 (315-30-18) and 18x8 (235-35-18), Fab speed exhaust, Innovate MTX, K&N Filter Mod., NGK BPR7EIX and DPR7EIX plugs, KEP Stage II PP with Street/Race Organic Disk., Weltmiester Swaybars, Adjustable AAR Mod, AAV Delete
Old 03-27-2014, 08:30 PM
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