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924RACR
Joined: 29 Jul 2001
Posts: 9075
Location: Royal Oak, MI, USA
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 Posted: Tue Jun 26, 2007 10:09 pm Post subject: |
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Sure sucks you can't run the back hatch... that can't be helping aero. Any change you can run a small lip spoiler at the rear of the roof??? That would probably help cut down on drag, give a nice separation to the airflow.
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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PORSCHEV
Joined: 02 Nov 2002
Posts: 1901
Location: Cedar Lake Nova Scotia, Canada
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| Posted: Wed Jun 27, 2007 7:13 am Post subject: |
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| 924RACR wrote: | Nice to have some vid there!
Sounds like it's popping quite a bit, and seemed slow to get going... with the popping, I'd wonder if maybe it was running lean... and with the slow wind-up, can't help but wonder if your control pressure regulator is OK? Have you put gauges on it and checked it??? If not, I'd do that soon... |
Well the control pressure regulator may not be working. I know some of the other wiring like the coil and fuel pump had to be rewired in order to function. This may be the same case with the regulator. The video sound may be throwing you off because the car has great power and pick up. All of the 4 cylinders are "popping" coming into the corner, coming from 5800 + rpm and jumping onto the brakes to set up for the turn. Also..I have an open exhaust as well.
Having said that I will check out the regulator... does it get power continuously of just until the engine warms up? The car goes throuh fuel like crazy so it's not very lean 
I can run a lexan hatch, which I do have plans for. In the meantime I may put a small lip on the roof. I know these cars sure do get alot of rear drag with no hatch.
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1976 924
5 lug conversion, 17'C2 wheels,custom body work,327 vette engine.
1978-#53 "D" track racer. |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Wed Jun 27, 2007 7:55 am Post subject: |
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| 924RACR wrote: | | Sure sucks you can't run the back hatch... that can't be helping aero. |
You ain't gonna believe this, but Shaggy got 27+ driving up to Vancouver, BC, with no hatch.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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924RACR
Joined: 29 Jul 2001
Posts: 9075
Location: Royal Oak, MI, USA
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| Posted: Wed Jun 27, 2007 8:38 am Post subject: |
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Wow, that is good!
FWIW, I get about 7mpg on the track.
You need the CIS pressure tester gauge set to check the control pressure regulator, not a voltmeter - you need to verify what pressure it's working to.
Or install a manually adjustable regulator and pressure gauge. A decent option for a racecar. Ideal is to have it cockpit-adjustable, to dial in your mixture on the fly. For that, you'll need proper braided stainless fuel lines (for safety) as they would have to run into the cockpit.
Have you checked plugs???
Lexan hatch? You know how much the lexan costs?? Mine was IIRC $500 from LP Aero, the guys in (IIRC) PA who make them (and supply to GT Racing, which sells them at about $650 per). Shipping's not cheap either, or easy, or I'd offer to sell you mine.
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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morghen
Joined: 21 Jan 2005
Posts: 9095
Location: Romania
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| Posted: Wed Jun 27, 2007 9:26 am Post subject: |
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you can always make a fiber glass rear hatch for yourself...
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Supercharger and EFI kits
https://www.the924.com |
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