What gay little thing took you out of the race at KOH? - Page 3 - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 02-12-2019, 06:49 AM   #51 (permalink)
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I am torn on the dead head issue being the problem .. perhaps that's better than running hot fuel back into the tank itself?
I assume you're running a rear radiator.

Are your radiator fans heating your fuel cell? The lack of airflow over the engine isn't helping anything.

If your fuel is starting off at 100deg+ it's not gonna need to sit very long in the fuel rail to turn it into vapor especially if the engine is just sitting in all the heat coming off the exhaust.

What fuel rail pressure are you running? You could down-size the injectors and up the pressure.

Last edited by arse_sidewards; 02-12-2019 at 07:01 AM.
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Old 02-12-2019, 07:09 AM   #52 (permalink)
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The team I was with lost PS pump then after being down for so long the batteries started draining causing lighting issues resulting in a crash that took the lights out completely.
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Old 02-12-2019, 07:15 AM   #53 (permalink)
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College fund???

Retirement fund???

What are these things you speak of?!!
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Old 02-12-2019, 07:19 AM   #54 (permalink)
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This, and at my age (66) the body won't take the pounding anymore. I still wheel, but KOH is a whole other level of pounding.
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Old 02-12-2019, 08:29 AM   #55 (permalink)
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Dual in tank pumps, Aeromotive regulator at the tank with a single line going to a dead-headed FAST Intake/Rail set-up. The FAST set-up was new for this year but the plumbing, including the dead head did not change from previous years set-up.

At one point the drivers side fuel rail (entry) was warm to the touch while the pass hot was uncomfortably hot to place your hand on. Let it cool for 10 mins, dumped a bottle of water on it and the son of a bitch came roaring back to full power .. for 1/2 mile hah!

I am torn on the dead head issue being the problem .. perhaps that's better than running hot fuel back into the tank itself?
sounds like a heat sink issue
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Old 02-12-2019, 10:18 AM   #56 (permalink)
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My experiences:

2012 - copilot in 4400 car, broke on outer limits trying to push another car up ledge. Lower control arm failed. Ended up putting on spare, but car broke and had to be recovered from Outer Limits.
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2015 - 4500 car. Track bar bushing failed allowing excessive chassis movement. This caused oversteering of the steering box. We broke 2 steering boxes on lap 2. Tapped out after Sledgehammer. Spare bushing on bench in Michigan. We were 11th after lap 1 and feeling like we could push for a good finish.
2016 - 4500 car finished
2017 - sold car, haven't been back
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Old 02-12-2019, 10:46 AM   #57 (permalink)
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Originally Posted by arse_sidewards View Post
I assume you're running a rear radiator.

Are your radiator fans heating your fuel cell? The lack of airflow over the engine isn't helping anything.

If your fuel is starting off at 100deg+ it's not gonna need to sit very long in the fuel rail to turn it into vapor especially if the engine is just sitting in all the heat coming off the exhaust.

What fuel rail pressure are you running? You could down-size the injectors and up the pressure.
Yes, is it a rear mounted radiator, which sits above my fuel cell. This is the same design and mounting configuration that I've been running for a few seasons now.

The hood has a few louvers and should theoretically be moving air .. especially on some of the higher speed sections. Oddly enough I started having issues towards the end of lap one, before having to slow it down for any of the more major rock trails.

The fuel pressure runs at a steady 58 PSI, thought I am measuring it back at the tank after the regulator.

What's odd is that this was never an issue before .. then again, I suppose most of my local races are shorter duration.
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Old 02-12-2019, 11:07 AM   #58 (permalink)
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This, and at my age (66) the body won't take the pounding anymore. I still wheel, but KOH is a whole other level of pounding.
So what year(s) did you race KOH?Just curious.
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Old 02-12-2019, 12:02 PM   #59 (permalink)
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So what year(s) did you race KOH?Just curious.
'33, '34, and '35
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Old 02-12-2019, 03:07 PM   #60 (permalink)
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'33, '34, and '35
18 or 19?
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