Fuel Sloshing
I recently did my first track day since going turbo and first time on NT-01's (from Azinis). I exprienced fuel starvation around the same turn every time I ran with the tank lower than 1/2 tank. Fill it up and no issues. I never had this problem in the past, but never ran tires this sticky.
Is it normal to experience fuel starvation at these grip levels? |
No. Miatas will run right down to E without issue (even on Hoosiers). Better check that your fuel pickup sock is in good condition.
|
I replaced the fuel pump/sock with the turbo install. I might have boogered something up. Worth checking I guess.
|
Definitely not normal, Miatas will run on fumes with Hoohoos and aero.
|
Did you use a stock fuel stock? Or a walbro sock?
|
either wrong sock, or incorrectly installed assembly/pump, or something else.
|
Or maybe it's just not actually true that all Miatas will run on fumes on the track. Mine won't, Ed's won't, several others won't. Mine has no broken baffles and a brand-new factory sock and still starves powering out of left handers when it gets down to 4-5 gallons left. A suggestion has been made that it might be the removal of the NB in-tank regulator that hurts it, due to the return pipe dumping the fuel halfway down in the tank. I stuck a camera in there and recorded it (not while moving) and it doesn't really appear to be that big of a deal. So I dunno. Rallas appears to have an NA, so presumably he hasn't removed an in-tank regulator.
One thought is that the "will run on fumes" allegation is (AFAICT) primarily based on endurance racing Miatas, particularly various cars owned/run by Emilio. Note that these are all naturally aspirated cars which suck down a whole lot less fuel per second than a turbo car does. I have read that the reason you want a factory fuel sock is that it lets fuel into the sock fairly easily, but prevents it from draining out quickly. In effect it's acting like a small surge tank. If so, then it's possible that this small reservoir of fuel is enough for a 150-180 rwhp to power out of a corner, but not enough for a 300+ rwhp car to do the same. For my car I've basically just been avoiding running it low by filling up every couple sessions. --Ian |
If I don't start a track session with at least a quarter tank, I will experience a fuel cut kind of symptom during a long left-hander. Maybe it's an Emerald Mica '99 thing.
|
Happens on my 91 on the street, thought I might have mounted the pump and therefore the sock too far up. But, last time I checked it was firmly against the bottom of the stock NA lower rubber grommet and foot. I was planning on removing the rubber grommet next.
My tank does not have tall baffles, its a small tray with maybe half inch tall walls. It would not hold much fuel where it needs to be. Can't find a good picture online, don't think my tank is modded or busted. Can't see any broken spot welds... I replaced the entire fuel system and lines, the filter, the sock twice... Hope my new one doesn't have this problem. Edit: Here's what the inside of my tank looks like. http://i.ebayimg.com/images/g/DGMAAO...Cu/s-l1600.jpg Is the sock supposed to be under that hole??? |
I only had the issue on turn one at CMP which is a left hander, not real long left hander though. No issues on any of the other turns.
I replaced it with an aftermarket sock that that looked identical to the original one removed with the original OEM pump, nothing special. |
Which turn at CMP? I have never had any fueling issues at CMP with my turbo 94. Had it down to less then a quarter of a tank many times.
|
Turn1
|
Does anyone have the part number for a factory fuel pump sock/strainer? I cant find any factory socks online.
|
BP4W-13-ZE1 Mine had to be ordered and was $40.00 at local dealer. Fits DW100 and 200. |
I've run/raced (and regularly for weight savings) down to the E many times racing. Never had fuel issues, ever. Most races I start at 1/4 to 1/3 full.
Stock fuel pump, regulator everything. 1600 turbo with 260 hp atw and now with the 1800 at 320+ hp atw (though we did change the pump to the DW one at the engine upgrade). edit to say: No jinxes. |
Yeah, I've put 12 gallons in an NA Miata at the track. Bone stock, never opened gas tank.
|
A stock NA6 tank setup will fuel starve with ~10oz left in the tank
|
Originally Posted by DNMakinson
(Post 1494973)
BP4W-13-ZE1 Mine had to be ordered and was $40.00 at local dealer. Fits DW100 and 200. |
|
Thanks! That's much cheaper too! Is that the factory part? Everyone seems to think that the factory sock/strainer retains fuel better than aftermarket socks/strainers.
|
All times are GMT -4. The time now is 07:05 PM. |
© 2024 MH Sub I, LLC dba Internet Brands