4g61t.org

Hmmm... seems like the the 4G15 lump coupled with a 5 speed stick vs. 4 would produce significantly more MPG/fuel economy (varied by driving of course). I was actually looking forward to this 'upgrade'. However, according to below links, the opposite is the case ... !? True, possible, or Bologna Sandwiches?

1.5 w/ 4 Speed Manual: http://tinyurl.com/lje99r
1.5 w/ 5 Speed Manual: http://tinyurl.com/mpm4tt

and (for the record...)

1.5 w/ 4 Spd Butt-a-matic: http://tinyurl.com/mzajvv

Kanpai,
#89

When I first swapped out my 1.5 and 4 speed manual, and installed a 1.6 and 5 speed manual, I immediately noticed that my engine seemed to rev higher in 5th than the old one did in 4th. It didn't help that I still had the 13" wheels, but it was what it was.

I can tell you that I almost finished a 500 mile trip on a single tank of gas with the 1.5, 4 speed combo. I must have gotten almost 45 mpg that evening. It was from Buffalo NY, to Jay Peak VT. We weren't going slow either. We did it in 7 hours

Cf,

Did you go cable 5 or hydraulic? The higher revs thing is what gets me... I'm searching right now for the gear ratios. 7 Hours!? Yowsers - The little engine that could.

Anyone else on decreased MPG w/ 5 speed? By actual comparison or swap?

4 on the floor,
#89

_________________
#89

My 4 speed was cable, the 5 speed is hydraulic, and came from a 1.6 Summit sedan.

Yes 7 hours, we had a convoy going too; my Colt, and two red 90 and 91 Civic sedans. The only way to tell them apart was a Ben and Jerrys sticker on one of their bumpers. Our friend met us up there and reported that he went exactly 5 over the limit the whole way, and it took him 8 hours.

I was under the impression that fewer gears = better gas mileage. Although I don't remember why I feel this way, lol.

The 5 speed that came with the 4g61 has different gearing than the 4g15's 5 speed. I've had both the 4 speed and the 5 speed (behind a 4g15) and the 5 speed was better on gas. I hated the 4 speed, rev'd high and the ratios just sucked badly, too long for a 4 banger (imo of course, some guys love the 4spds).

_________________
Had a:
1991 Eagle Summit ES Hatchback - 4g15 12v 5spd
1991 Dodge Colt -4g15 12v 4spd
Have a:
1978 Oldsmobile Cutlass - 468BBO TH350
Round 3:
1990 Dodge Colt-4G63T 5spd

My 91 hatch is a 4 speed and my old 89 hatch was a 5 speed. The 91 seems like it has more pep and it gets a little better mileage. Could be the difference between the 8v and 12v 4G15 though.

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93 Mitsubishi Expo LRV 1.8/manual
95 Eagle Summit DL Coupe 1.5/manual
01 Mitsubishi Mirage ES Sedan 1.8/manual

I only get 28 MPG highway with my current setup.

my little 1.5L 8v with 315,000 mi drove across country from Seattle, WA to Allentown, PA getting 52 MPG with a 4 spd cable tranny and a full car load( 2-47"tvs, clothes, etc) at average speed of 75mph(what a long 3.5 days). Alot better than any of my 5spd Colt I owned, but could greatly depend on the persons driving style

I swapped out my old cable 4-speed with a hydraulic 5-speed, on my 92' Colt 12 valve 1.5

By comparison, think I got "slightly" better gas mileage with the 4 speed, running just a bit lower revs on the highway. The 5 speed makes driving a lot smoother than the 4 speed. A little easier on the clutch taking off from a stop.

Not a whole lot of difference between the two, or but maybe the 5-speed is more reliable. My other transmission totally went out at 200,000 miles.

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Good stuff - trucks bring it!

Looked up the ratios, 1-4 ratios are the same between the 4+5 speeds, 5th is overdrive obviously.

_________________
Had a:
1991 Eagle Summit ES Hatchback - 4g15 12v 5spd
1991 Dodge Colt -4g15 12v 4spd
Have a:
1978 Oldsmobile Cutlass - 468BBO TH350
Round 3:
1990 Dodge Colt-4G63T 5spd

I have to agree with Incoltino about the first gear; I remember it being smoother to just spin the tires to start off because first gear was such a high ratio with my four speed.

Ps. Yeah my four speed blew up twice, but I wish I had video of my Colt spinning those 13" tires while towing my 17' fiberglass boat out of the water. LOL

is there a difference in the 5spd hydraulic and the 5spd cable?

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91 plym colt 4g 4g15 12v/ 4g37 upgrades 5spd flat black

Other than how they're actuated, no.

_________________
Had a:
1991 Eagle Summit ES Hatchback - 4g15 12v 5spd
1991 Dodge Colt -4g15 12v 4spd
Have a:
1978 Oldsmobile Cutlass - 468BBO TH350
Round 3:
1990 Dodge Colt-4G63T 5spd

so what's better on fuel economy when mount those 4spd and 5 spd on same engine...i'm planning to change my 4spd tranny 5spd tranny to mount on my 4g15 8V engine...i'm after fuel economy...thanks

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