North American Turbocoupe Organization



Gas mileage?
turbospoolin23 Offline
Senior Member
#1
Anyone know how many kilometers you should get on a full tank of 91 octane?

The reason i ask is because my fuel gauge doesn't work, and the other day i filled up and only got 425km before i ran out of gas. This was easy driving, no racing, about half city and half highway driving. It's been awhile since i filled it, but from what i remember i thought i could get around 600km on a tank. If my mileage seems low to you guys i think i might have a leak where the filler neck meets the tank. That seal ripped a bit when i put in a new fuel pump.

Since i know the tank is empty i might just drop it and test the fuel gauge sender and replace that seal.

Edit: I just had a quick look at that seal and it's pretty tight, clean, dry, and unstained. So i don't think it's leaking. Now i don't know what to think...
87 TC 5 spd... 17X9 Cobra R's, .60/.63 SVO T3 Turbo, Large NPR, Manual Boost Controller, AEM Wideband, BPV, K&N Cone, Walbro 255, Kirban AFPR, 3G Alternator Conversion, Short Throw Shifter, Stinger 3" Exhaust, Magnaflow Catalytic Converter & Muffler.
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Pete D Offline
Administrator
#2
That works out to 264 miles. How many (US) gallons did it actually use to go that far?

At 10 gallons that is 26.4 mpg which is acceptable for highway miles. Some people claim to get 30 mpg highway trips in 87-88s

At 15 gallons that is 17.6 mpg and that is definitely not good for "easy" mixed driving.

These are based on US gallons.
Pete Dunham


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xcrunnerbd Offline
Posting Freak
#3
There are a few starting points but yeah, how much fuel did you use? Are you the only driver? Perhaps someone reset your trip odometer at some odd time? I've done this to myself after driving new running routes. I go fill up and .. what happened to mileage? OH yeah...
Project 13 sec. / 30mpg in '88 TC 5Speed : [email protected] / 32+ mpg

On The Car: KN cone, 2-stage [email protected] 15psi wired to fuel switch, Kirban AFPR @ 39psi, Walbro 255 HP FP, 130A 3G Alt., Full 3" Stinger Exhaust incl. cat. no muffler,

Shelf: .48 T3, ported E6, BPV
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Martin Offline
Senior Member
#4
Assuming you had a full tank ( 22 US Gallons, 18 CDN Gallons or 83 Litres) and you drove 425 K's ( 264 miles) it means you got around
12 Miles to the Gallon US
or 14.66 Miles to the CDN Gallon.
or to make things even more screwed up,
5.12 Kilometres to the litre.
In Metric speak, which really screws us up in the Great White North, you are by Transport Canda's way of measuring, your are going 19.53 litres per 100 K's, which is not that good at all for mixed, on 91 Octane!
On the highway my Auto still gets over 26 miles to the CDN Gallon. Typical trip for me on the highway through mountain country gets me 700 Ks on a tank.
Mixed driving should still get you in the 22 plus range.
Everything is subjective however. If your causl driving puts you into the "boost" all bets are off.
Martin
Stock 87, no mods, Black with the grey interior.
Boost High, Fly Low
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turbospoolin23 Offline
Senior Member
#5
Today i had some time to work on the car and first thing i noticed was i had a leaky heater hose. It was leaking on my spark plug boot/exhaust manifold. So i change that and i also did the thermostat and gasket too because it was leaking a little.

Okay so with all that out of the way now, the other day when my car died on me i was in front on my house and was able to restart it and limp it onto our driveway. Today when i went to buy some fuel the only jeerycan i had holds 1 gallon, so i filled it up and brought it home. Well as i'm pouring it into the gas tank i can hear splashing like maybe my tank isn't empty, i shrug, drained the jerrycan into the tank and put the cap on. I started the car up and it was running rough, vacuum was very weak to nothing, and my cheapo a/f gauge was pegged in the red. It only ran for about 30 second then stalled and would not fire back up. Now it's late and i have to wait until morning to have a look at it, i hope i can get this straightened quickly because i'm starting a new job and need my wheels for monday!
87 TC 5 spd... 17X9 Cobra R's, .60/.63 SVO T3 Turbo, Large NPR, Manual Boost Controller, AEM Wideband, BPV, K&N Cone, Walbro 255, Kirban AFPR, 3G Alternator Conversion, Short Throw Shifter, Stinger 3" Exhaust, Magnaflow Catalytic Converter & Muffler.
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bang4thebuck Offline
Senior Member
#6
lean?? maybe the fuel pump is about kaput? Check your vam voltage and fuel pressure too.
1987 TC 5 speed. To date: AGP 50 trim T3/T4 .63 stage 2 turbo, Ebay bov, 28psi, 255hp pump, Kirban FPR, Ebay Front mount, Full 3 inch Exhaust, Ported Bob's Log, Megasquirt, 55lb. injectors, boport 1.5 cam, boxed lower control arms, Methanol Kit, Ram HD Clutch, front lowered 1/2 inch and E.T. Streets for the track. Best so far 12.5 at 110.8. still tuning.
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Pete D Offline
Administrator
#7
For the sake of starting fresh, how old is the tune up on this car?

There will always be a little gas in the tank, even if you run it empty. Running it empty or near empty can increase the chances of picking up crud and sediments from the bottom of the tank.

Running rough - tuneup, air or vacuum leak. Hows those IC hoses?
Pete Dunham


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turbospoolin23 Offline
Senior Member
#8
bang4thebuck, my fuel pump is relatively new. I just replaced it last year with a new one so i hope it's not kaput.

Pete, tune-up was done last year, it's been less than 10,000km since all that was done. About 3,000 of those km's were put on this year and the tune seemed fine up until it died. The intercooler couplers a also pretty new, but i'll double check for leaks.

I'm going out to have a look and i'll let you know what i find.
87 TC 5 spd... 17X9 Cobra R's, .60/.63 SVO T3 Turbo, Large NPR, Manual Boost Controller, AEM Wideband, BPV, K&N Cone, Walbro 255, Kirban AFPR, 3G Alternator Conversion, Short Throw Shifter, Stinger 3" Exhaust, Magnaflow Catalytic Converter & Muffler.
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turbospoolin23 Offline
Senior Member
#9
I just went out to have a quick look at the car, i didn't see any obvious vacuum leaks and the intercooler couplers appear tight. So if there is a leak, it`s tiny and i would think the car should atleast start. I`m going to dump another jerrycan or two in the gas tank then try it again. For some reason i got a feeling my timing belt might have jumped, i don`t know why i feel that way it`s just something in the back of my mind. I`ll have to check that too. Oh yeah, to make my day even better it`s cold outside and snowing. Damn.
87 TC 5 spd... 17X9 Cobra R's, .60/.63 SVO T3 Turbo, Large NPR, Manual Boost Controller, AEM Wideband, BPV, K&N Cone, Walbro 255, Kirban AFPR, 3G Alternator Conversion, Short Throw Shifter, Stinger 3" Exhaust, Magnaflow Catalytic Converter & Muffler.
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turbospoolin23 Offline
Senior Member
#10
I added another 2 gallons of fuel and then try'd to start it again. It fired right up and is running like it usually does, vacuum is at 19" and a/f is rich because it's still cold. Now i'm off to put more gas in and test it out.
87 TC 5 spd... 17X9 Cobra R's, .60/.63 SVO T3 Turbo, Large NPR, Manual Boost Controller, AEM Wideband, BPV, K&N Cone, Walbro 255, Kirban AFPR, 3G Alternator Conversion, Short Throw Shifter, Stinger 3" Exhaust, Magnaflow Catalytic Converter & Muffler.
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