Ok i was wondering what you guys thought about raising the rpms? Has anyone heard of anybody getting the tranny rebuilt or a 3 angle valve job to raise the rpm's on a lancer? I just searched and the only thread i found on this topic is from 2002. It talked about raising rpm's with a cam is hard since its a sohc engine. Does anybody know if mitsubishi has a dohc head that will bolt up to our motor? Just throwing something new out there.

 

The only thing I know of is that RRM's ported head includes a 3 angle valve job, though I didn't know that did anything to the rpms. And I've heard that you'd want to beef up the rods if you're looking to make it rev much higher. For a manual transmission you could probably get custom made gears. I'd been reading up on the 4g92(1.6L) engine, which has a DOHC head that might(emphasis on MIGHT) bolt to our block, but then you need everything for that motor, and figure a way to tune it to believe it's just the 1.6L bored and stroked to 2.0, cause you can't tune an SOHC ecu to think it's DOHC. That and the timing belt would no longer fit, so you'd be kinda screwed there.

EDIT: And by raising rpms, do you mean making it rev faster or actually increasing the redline? Cause none of that will raise the redline other than the whole 4g92 swap, but that's all theoretical, and swapping in a complete 1.6L engine isn't really helping when you consider how much heavier the Lancer is than pretty much anything that had 4g92's. I believe there's a way to tune the ecu to a higher redline, but discussion on that matter has always implied that it's quite risky business.

Once I get my car paid for(if ever....) I'd love to try the whole swapping on a DOHC head thing, but finding a 4g92 and everything I'd need? Needle in a hay field.

 

Hmmm i remember someone asking this and some1 said why? because lancer's make peak power at what? around 5500? so what would raising the redline do o.O.

If im wrong im sorry ;P. oh and that sohc to dohc thing? i dunno lol.

 

If you mean raise the rev limiter, the answer is in the head. You'd need a more aggressive cam, valve springs, and maybe retainers, valves, and other head components. I would do the rods if it was my car just as a safety precaution. You'd also need someway of modifying the ECU to actually raise the limiter itself and tune the car so it was worth doing.

 

The 4g92 Mivec will NOT bolt to either the 4g93/4 that has been confirmed by the Mirage guys long ago. Just wanted to clarify that.

As for the rest, what Amby just said is 100% correct. It is all in the head. Lightweight will cause it to rev easier which naturally increases the limit to which it can rev. This goes the same for Pistons and Rods but they do not raise the revs quite as well as head work does.

 

They might make peak power around 5500. But how about running a turbo such as the 16g with a higher redline in the lancer. That makes plenty of since to me.

But also if heard of raising it through the gears in the tranny aswell. Such as sheppard racing rebuilding trannys which extends redline. I believe his dogbox raises the 2nd gen dsm's redline to 10k if i remember right. But theres no way i would pay 20k for a tranny in a lancer.

 

Yea i got the idea from a guy selling his evo in the classified ads. He had alot of headwork done and now redlines at 9k i believe.

 

you need bigger cams, valves, springs, etc. along with a raised rev limited to do that.

 

Bigger cam, a lancer only has one. Turbo with a higher rev limiter might be a bad idea but I'm not entirely sure. The way I see it the engine is already being stressed by the turbo and rasing the rev limiter might be too much for it. You also wouldn't need it either since the turbo would make power throughout the band. The rev limiter is in the engine but what you can do is change the tranny ratios so that the gears are longer. This means that instead of being at 3000 RPM at 30 mph, you're at 2500 RPM.

 

The 4g92 Mivec will bolt on to the 4g93T block. RPW makes a stage 4 engine by mixing both of them.

 

Hmmmm.... if only RPW's site was back up. Regardless of whether it works for 4G94 blocks, it'd be an interesting read that I could probably learn a lot from.

 

Check out the NZ Mivec boards.... I know people back in the islands that run hybrids.

Matter of fact, this is a Mirage hatch with a GSR bottom end and a MIVEC top end.

 

That's friggin cool, definately worth learning more. Thanks for the info, with any luck and a lot of saving, I might just give this a go in the somewhat distant future.