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Car Forum / Toyota / Toyota Cars / November 2007Two 89 Toyota Cressia ?'s - gas mileage and disabling the alarm
What mileage do you think an '89 Toy Cressida w/7MGE should get? After 2 fill ups on a longish trip, I seem to be getting around 26 - 27. Almost exclusively highway driving at speeds varying from 50 - 80, mostly in the 65 - 75 range.. Could there be any advantage to setting the timing to more than the 10 degrees the shop manual advises? Or could the system be designed to operate assuming that specified timing? I refer to it as a "system" since all the engine functions appear to be regulated by an onboard computer/brainbox. Also, I find that there are brain boxes for both the alarm and the cruise control. The alarm has been having problems going off spontaneously. Disconnecting the brain box for the alarm cures this but also diables the cruise control. Their wiring harnesses appear to be connected. Is there a way to disconnect only the alarm without effecting the cruise control? Maybe a way other than disconnecting the brain box for it? Thanks for all input. > What mileage do you think an '89 Toy Cressida w/7MGE should get? After > 2 fill ups on a longish trip, I seem to be getting around 26 - 27. > Almost exclusively highway driving at speeds varying from 50 - 80, > mostly in the 65 - 75 range.. 26 ~ 27 MPG highway mileage is pretty good for an '89 Cressida. > Could there be any advantage to setting the timing to more than the 10 > degrees the shop manual advises? Or could the system be designed to > operate assuming that specified timing? I refer to it as a "system" > since all the engine functions appear to be regulated by an onboard > computer/brainbox. Setting the timing to more than the manual's specified amount can cause pinging so don't do it. Even if the car has electronic spark advance, ithe ECU will retard timing back do stop the pinging so nothing is gained. > Also, I find that there are brain boxes for both the alarm and the > cruise control. The alarm has been having problems going off [quoted text clipped - 7 lines] > > Thanks for all input. Use the shop manual to diagnose whatever is setting off the alarm, or use an electrical wiring diagram to determine which pin in the alarm control box triggers the horn and back that pin out of the connector.  SignatureRay O (correct punctuation to reply) >> What mileage do you think an '89 Toy Cressida w/7MGE should get? After >> 2 fill ups on a longish trip, I seem to be getting around 26 - 27. >> Almost exclusively highway driving at speeds varying from 50 - 80, >> mostly in the 65 - 75 range.. > > 26 ~ 27 MPG highway mileage is pretty good for an '89 Cressida. 26 is great!. The Cressida we had rarely broke 20 mpg unless you were going down hill with a tail wind. It was the worst POS I have ever owned. Ed >>> What mileage do you think an '89 Toy Cressida w/7MGE should get? After >>> 2 fill ups on a longish trip, I seem to be getting around 26 - 27. [quoted text clipped - 7 lines] > >Ed ROFLAMO I was wondering where you were, Ed... SignatureScott in Florida > ROFLAMO > > I was wondering where you were, Ed... The mere mention of a Cressida is enough to make me crawl out of hiding. I still have nightmares about that POS. Riding around town the gas mileage was in the mid-teens. The car had one feature I liked, a drain plug on the automatic transmission. That worked pretty well. Almost nothing else did. Ed > What mileage do you think an '89 Toy Cressida w/7MGE should get? After 2 > fill ups on a longish trip, I seem to be getting around 26 - 27. Almost > exclusively highway driving at speeds varying from 50 - 80, mostly in the > 65 - 75 range.. Holy Crap!!! You're getting that kind of mileage with an automatic?!?!?! I consider myself lucky if I hit 22 with my Supra, same engine!!! Course, if I kept my RIGHT FOOT OUT OF IT...! > Holy Crap!!! You're getting that kind of mileage with an automatic?!?!?! > > I consider myself lucky if I hit 22 with my Supra, same engine!!! > > Course, if I kept my RIGHT FOOT OUT OF IT...! Well, that's of course going by my trip odometer, brand new rebuilt engine, out of 700 or so miles probably 690 of them between 45 & 75 which I'm guessing is right in the optimal mileage zone. Not sure if it's my imagination, but the low-end acceleration feels stronger to me than it did before my trip. > On Nov 24, 9:59 pm, Hachiroku $B%O%A%m%/(B <Tru...@AE86.gts> wrote: > [quoted text clipped - 3 lines] >> >> Course, if I kept my RIGHT FOOT OUT OF IT...! I am guessing the Supra and Cressida have different final gear ratios. Were the engines tuned the same? I would guess not. > Well, that's of course going by my trip odometer, brand new rebuilt > engine, out of 700 or so miles probably 690 of them between 45 & 75 > which I'm guessing is right in the optimal mileage zone. NEW REBUILT ENGINE = the mileage should improve as the engine breaks in. 75 mph = way out of the optimal zone for gas mileage, especially for a car from the 80's. They were geared with the 55 mph speed limit in mind. Using the trip odometer = Are you basing this on a one tank average? Keep a book on the mileage for at least a month. Single tank averages are notoriously inaccurate. I feel you need at least 3 consecutive tanks of gas to get a good average. > Not sure if it's my imagination, but the low-end acceleration feels > stronger to me than it did before my trip. Probably because the engine is "breaking in." Rebuilt engine are more likely to need a long break in period that factory new engines. Rebuilders, even good ones, just won't match the OE Toyota tolerances and finishes on cylinders (well unless you had a race shop do the engine). I still can't believe the Cressida will get that kind of mileage. Ed > > Well, that's of course going by my trip odometer, brand new rebuilt > > engine, out of 700 or so miles probably 690 of them between 45 & 75 > > which I'm guessing is right in the optimal mileage zone. > > NEW REBUILT ENGINE = the mileage should improve as the engine breaks in. Cool! 40 mpg here I come! ;-) > 75 mph = way out of the optimal zone for gas mileage, especially for a car > from the 80's. They were geared with the 55 mph speed limit in mind. Really? It's not even breathing hard at 120 per the speedo, lots of pedal left. I haven't run it that fast yet since the rebuild though. I'll have to re-check but I think it's spinning about 2800 at 75. > Using the trip odometer = Are you basing this on a one tank average? This was two tanks, both almost pure highway driving. I won't have that experience again for a while. ><snipped> I still can't believe the Cressida will get that kind of mileage. > > Ed I used to get that on pure highway trips all the time. SignatureRay O (correct punctuation to reply) Hey see if there is a fuse for a the alarm. And if there is pull it on out. Just my $0.02 Jamie Oh and I would not count on 40 MPG on that old car. Maybe 30 if your lucky. Jamie >> Well, that's of course going by my trip odometer, brand new rebuilt >> engine, out of 700 or so miles probably 690 of them between 45 & 75 [quoted text clipped - 4 lines] > 75 mph = way out of the optimal zone for gas mileage, especially for a car > from the 80's. They were geared with the 55 mph speed limit in mind. That's true for a GM, but in Japan the nationsal speed limit is 100... KMh. Which is 62 MPH. Almost all my Toys have acheived their best economy at 70MPH. |
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