Thoughts on 4B1 engine swap?

[stealthee]

With my SOHC 5 speed I could get upwards of 28+ mpg on trips. I averaged 25 mpg in daily driving it.

That was with the stock gearing too. Had I had the taller 5th I could have been well over 30 mpg on trips.

The only negative to the 6 speed is it would make the SOHC even slower. That's the main reason I haven't looked into putting one into mine after all my transmission breakages. I like the torque in the lower gears.

[donniekak]

I've gotten 30+ mpg with a heavily modded 4g63 awd car. I've also gotten 30+ in a 6g72 twin turbo stealth. The biggest obstacle to good mpg in these cars isn't the engine. No matter how efficient the engine, accelerating a given weight to a given mph is going to take a fixed minimum amount of energy.

[Unknownvr4]

The fwd lancers also use a garbage CVT transmission to get gas mileage numbers. Not sure if you could get a base Lancer with a stick.

If you were to do this swap, I think you should do the 4B11T from an EVO. That would be a much more interesting swap even if you decided to keep it stock.... though if the mod bug hit later on, there would be endless possibilities.

[familyMAN]

That right there should give you a hint. Check his thread creations on his profile, and you will find some interesting info.

I need to update that again. No more 4g64. High revving 4g63 is for me!

I average about 8-10mpg with "mixed" driving. Lol.......E85 and I really love the loud pedal with 9k rpms.

[Streamln1]

Gotten some Dyno or track times yet Eric?

[rafinger]

That right there should give you a hint. Check his thread creations on his profile, and you will find some interesting info.

D'oh! Didn't even see the avatar. Read through his threads, very interesting stuff indeed.

Gearing would help your cause without changing engine platforms. With the 12% higher fifth gear in my old NA I routinely got 27+ MPG and got 29 on a long trip doing 90.

I imagine a 5 or 6 speed getrag swap would produce similar results, in fact a six speed JDM trans would probably be perfect. It does 2000 RPM at 60. 2500 at 75

The 6G7x series engines are reliable, especially in NA form. My old NA had 180,000+ miles last time I heard of it and it sounded perfect. transmissions on the other hand...

With my SOHC 5 speed I could get upwards of 28+ mpg on trips. I averaged 25 mpg in daily driving it.

That was with the stock gearing too. Had I had the taller 5th I could have been well over 30 mpg on trips.

The only negative to the 6 speed is it would make the SOHC even slower. That's the main reason I haven't looked into putting one into mine after all my transmission breakages. I like the torque in the lower gears.

Gearing wasn't even something I considered. That is probably what I'm going to do since that is quite a lot easier than a complete engine swap. Though an engine swap in addition to a tranny rebuild would be nice in the future! I did a bit of research and found out the TRE made some taller gears that were for FWD cars, but are they out of business now? The threads I found were from a decade ago and their website hasn't been updated in 5 years. I did also see that taller gears could be used from an EVO III, part numbers MD743980 and MD743319. But that is only for a Getrag transmission, right?

[stealthee]

TRE didn't make the gears. They sold stock 5th gear gearsets from other Mitsubishis.

I used to have all the info written down regarding which 5th out of which Mitsubishis would give you the each result.

The Evo 3 used a Mitsubishi transmission.

[rafinger]

TRE didn't make the gears. They sold stock 5th gear gearsets from other Mitsubishis.

I used to have all the info written down regarding which 5th out of which Mitsubishis would give you the each result.

The Evo 3 used a Mitsubishi transmission.

Awesome! I found the part numbers from this thread HERE. The original poster said he had a Getrag transmission, so are the part numbers I have correct for my FWD transmission? I found both those parts from an import retailer for around $250, excluding shipping. If those are the right ones, I'm going to go ahead and order them.

[sohcstealth]

Awesome! I found the part numbers from this thread HERE. The original poster said he had a Getrag transmission, so are the part numbers I have correct for my FWD transmission? I found both those parts from an import retailer for around $250, excluding shipping. If those are the right ones, I'm going to go ahead and order them.

If your transmission is FWD, then you have a F5M33 unit, made by Mitsubishi.

The poster in that thread was incorrect in saying that they had a Getrag unit.

Getrag units were only in the AWD models, using part numbers W5MG1 (5-speed) and W6MG1 (6-speed).

So, if the parts in question are for a F5M33, You have the right part numbers providing they were looked up correctly.

Hope the helps to clarify some things.

[familyMAN]

Gotten some Dyno or track times yet Eric?

Nothing great. Trapped 128 at the shootout last year at only 29psi (not bad for an auto). Get ready for excuses..........ET sucked at 11.8 because I didn't have enough fuel in the tank and sucked air when fuel pushed to back on acceleration, leaned out, hit fuel cut and shut off car for over a second of no acceleration. Also kept pulling through the brakes and only launched at 5psi instead of 15 if I hadn't kept forgetting to neutral rev to get some vac to brake booster. Hot-lapping, plus fuel cut had me nervous so I forgot each time. lol. Harder launch would've just sucked tank dry faster anyway. BTW, 1.8 60ft is boooooring.

Got home, put a few more gals of E in the tank and it launched great on the street. O-60 in my normal 2.6-2.8 (depending on how much wheelspin) vs 4.1 at shootout because of the aforementioned issues. Have run up to 38psi on the street with the 2.4l. Noticeably more power than 29. Hit some local car shows. Beat on it, but never got a chance to take it back to track to see what would happen because an oil filter backed off, lost my oil and lost my engine.

Now on a 2.0 for more revs. Running just WG spring right now of 35psi. Have tried turning it up to 40, but need to install my second walbro 450. Leans out too much up top for 40psi. Few more changes...Nitrous is going in to make staging quick and easy, vacuum pump is going on brake booster triggered by brake switch, K&N oil filters with safety wire, plus a 10pt chromoly cage is almost complete. Still on a 60mm hx40. Have a billet 67mm wheel that may go in, but also may see if I can break some 3S/6g72 hearts on the little 60mm first




...and spending a ton of time and money on an engine swap with an engine turned the wrong way, is a really odd way to try to save a few bucks on gas. Strange thread, so I don't feel bad for the derailment.