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-   -   Pardon my ignorance: why is the 7M-GE so much less efficient? (http://www.toyota-supra.info/forums/mkiii-supra/8607-pardon-my-ignorance-why-is-the-7m-ge-so-much-less-efficient.html)

T-Supra 05-31-2007 09:46 PM

Quote:

Originally Posted by finaltable
The 3.0 V-6 in the '07 Honda Accord make 244 HP, 211 ft-lbs of torque and gets 21/30 MPG. The 3.0 7M-GE makes 200 HP, ~190 ft-lbs of torque and does about 18/23 MPG. I understand that the 7M has a longer crankshaft being a straight engine instead of a V but this doesn't seem to me to be enough of a difference to make such a disparity between the two.

Can someone shed some light on this for me?

(I'd like to point out that I am aware there is a roughly two decade difference in the technology of these engines. Were we just that much less knowledgable about what could be done with an engine in 1987? It just seems to me that given that the Porsche 959 came out around that time we (as people in general) couldn't be THAT primitive compared to today.)

Well, I for one understand that your just asking a simple question and your not trying to bash a Supra... I gonna give my 2 cents and I dont even own one...

20 years of development in engine technology has to play a big part in this... Compare a ECU from 1987 to 2007, theres more brains in 2 chips from an 07 one to the whole Supra ECU... Inector sizes will play a role in MPG, compression ratio will, engine internals will, timing will, gearing will, vehicle weight will etc... Lots of things to look at.

Just for the record, I have a 1971 Datsun 240Z, 2.4L I6 SOHC with twin 46mm side draft SU carbs, a 4 speed (no overdrive), 3.54 gears, and it gets 24mpg highway... the car only weighs 2300lbs, but it just goes to show anything can affect MPG.

oowee623 06-01-2007 08:28 AM

if you are unhappy with the efficiency of the M series engines, you can swap it out for the JZ series and keep the heart and spirit of a supra

j3pz 06-02-2007 12:56 AM

congrats on your car. hope you have a thick wallet but assuming that you waited 18yrs for one means you dont have much green to coush your tootch (haha that rhymed). dont mean to discourage you. the majority of the people here are in that same boat and love their supras to death, its just with 20 yr old cars parts tend to go bad and you will get frustrated about that. anyways welcome to the supra brotherhood.

finaltable 06-03-2007 12:23 AM

I actually have a decent amount of money to spend. The reason I haven't gotten one before now is that we have two kids and I have been supporting the family on just my income so the idea of getting a less efficient/practical car has been something the wife wouldn't exactly support. She has gone back to work and I got a job that is going to require that I drive about an hour each way everyday. Since the alternative is that we move (and she REALLY does not want to move) I finally put my foot down and said "I took this job which pays more than I have ever made to support us and if I am going to be driving 2.5-3 hours a day I AM going to have a car I enjoy driving." She realized that I was right and supported me actively looking for a Supra. I probably could have bought a Mk IV but the Mk IV would have been less practical when it came to putting 2 carseats in the back. I expect to put several thousand into the car in the next few years making it "new" again. A complete repaint in in the works but that will be the last thing I do after getting all the mechanicals taken care of.

cars4me89 06-03-2007 12:49 AM

the MKIV would also been more for insurance since they're worth quite a bit more than MK3's.. but the supra was a good choice for a highway driver going to work and such.. they're excellent cruisers and in fact are efficient on the highway.. i get about 22-24 on the highway and only 15-18 in the city. so good choice

j3pz 06-03-2007 07:00 PM

putting the foot down ftw!

mattfurlani 06-03-2007 09:12 PM

Quote:

Originally Posted by finaltable
The 3.0 V-6 in the '07 Honda Accord make 244 HP, 211 ft-lbs of torque and gets 21/30 MPG. The 3.0 7M-GE makes 200 HP, ~190 ft-lbs of torque and does about 18/23 MPG. I understand that the 7M has a longer crankshaft being a straight engine instead of a V but this doesn't seem to me to be enough of a difference to make such a disparity between the two.

Can someone shed some light on this for me?

(I'd like to point out that I am aware there is a roughly two decade difference in the technology of these engines. Were we just that much less knowledgable about what could be done with an engine in 1987? It just seems to me that given that the Porsche 959 came out around that time we (as people in general) couldn't be THAT primitive compared to today.)

well you answered your question.. look at 1987 honda civic and how much power thaqt puts out. besides the super was designed to have potential. just like the 5.4 mustang has a hp potential of like 1500 whp...

i bet you the new supras have like an easy 450hp when/if they come out in '08

supramacist 06-03-2007 09:17 PM

I'm hearing 400hp on the new ones.

mattfurlani 06-03-2007 09:22 PM

Quote:

Originally Posted by supramacist
I'm hearing 400hp on the new ones.

its gonna be a v-6 standard optional v-8 i read

so maybe we're both right its gonna be the 5.7L that is in the tundra's with a stroker mod and some other bs

SUPA FAST

supramacist 06-03-2007 09:29 PM

I just found out around a week ago that nissan is working on a 5.7 liter to be put into the z.


We definitley may be on the right track.


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