Hey guys

I am new to this board and to lancers. My last car was a 1995 Volvo 850 Turbo. 5 cylinder, 2.3L, with a mitsu 15G turbo that could push out like 18psi.

Here is the dilemma, my new car has compression of 9.5:1, compared to the volvo this is much higher (8.5:1) I mean is it really worth it to bolt a turbo on to a car where u can't pull more than like 6-7psi of boost?

before I go about putting the money into this car, my number one concern is how do you bring the compression down? there is no fun in boosting unless you can keep on cranking it up

not trying to start a war or lighting flames for anybody being rice just asking a simply question

thanks

 

well you can get custom pistons to decrease CR or you can get a large head gasket.

Neither are often done but you can do it.

I can tell you for a fact 5-7 psi is fun

 

if you dont think intercooled 5 psi on a lancer is fun... then you just dont know

...so my answer is, yes, it is worth it.

 

well a...a FEW people that have Lancers are pushing 10+psi i don't know what they did compression wise... boeturbolancer is one on here and on the midwest forums (forgot link...you'll see it in peoples sigs) say they have some guy pushing psi up there to

 

yeah u think its worth it...lol

but i have boosted up to like 16psi so 5psi to me is like having a really BIG boost leak ...u think you are fast but you really aren't

not hating just speaking from experience

going back to the subject of pistons and headgaskets...i know spacer gaskets are available...anybody i should look at?
also who else sells pistons besides rrm?

i would definelty suggest decreasing comperssion cause that will also partially solve the need to run so much fuel and also the need to buy a bigger fuel pump and/or injectors

 

Theres only one thing to do then mate, sell up and by and Evo, you can run as much boost as you want then (well up to 2.5 bar any way)!!!!! ļ

 

you had a volvo... 850turbo.... which will not run 18 psi in the first place.. lol i had one its a volvo not an evo... and that car weighs 5k lbs. put 8psi in the lancer and see how fast it is..

 

You're just getting compression from the pistons instead of the turbo. 16psi with a stock 8.5:1 isn't that much more than 7psi at 9.5:1.

8.5:1 + 16psi of boost = 17.751700680272112 effective compression

9.5:1 + 7psi of boost = 14.023809523809525 effective compression

If I'm not mistaken, the turbo Volvos also weigh significantly more. My aunt's '95 850 Turbo (stock) certainly is not as fast as my Lancer was at not even a full 5lbs for whatever that's worth. Yes, it makes more power, but I also am pretty sure it weighs at least a couple hundred pounds more. I think it may be that you're the one thinking he was faster than he was. Of course I'm not saying the Volvo at 16psi was slow or that the Lancer is particurlarly quick. I just think you missed the point of boost vs CR.

http://www.fbody.com/calc.htm

EDIT: My unofficial source tells me that the '95 850 weighs apprixmately 3,200lbs as compared to the Lancer's 2,790 (some have weighed theirs on truck scales and come up lighter, but I trust Mitsubishi's weights more than a truck scale I've never met. )

 

umm first of all a 850 turbo will actually run up to 24psi on a stock turbo...all you need is an upsolute ecu...u don't believe me let me get my friend to show you his boost gauge

i know about the evo...but my wallet can't afford it

i looked into my owners manual and i saw a weight of like 3200 lbs i thought...2790 is sure a lot lighter and will definelty make a difference

also stock 850 turbo is 9psi and stock 850 turbo R is 11psi
any chip will automatically push u to 15-16psi guaranteed

i have a lot to learn about the lancers...just i think i more worried about the high compression leading to quicker problems...u just gotta be more careful

i think i'll like it here...some of you know your stuff well

also don't vent to the atmosphere...its not cool with a MAF( another topic??)

 

I vent to atmosphere, but I don't have a MAF. (or a running car at the moment ) It can be done with the proper fuel computer I believe, but I don't know if AFC or E-manage can tune decel fuel trims. If you do it on a stock ECU you'll certainly cause sudden richness, stumbling, and possibly stalling.

Almost everyone is running recirculating though to the best of my knowledge.

BTW, the numbers I was comparing were from a 1995 850 (basically the same car my aunt has because it's the only one I'm personally familiar with). I'm aware there are other trims, but I'm not aware of much else.

As for the max boost, yeah. The Lancer wasn't built to handle much boost. Honestly I think you're asking for trouble in the valvetrain if you start getting carried away, assuming you have enough fuel to prevent detonation. Once I get my head taken to Turbotrix I'm gonna probably have them rebuild the valvetrain, but I'll get a relative assesment of the stock 4g94 head as opposed to the Mirage (if they're familiar enough with it) and certainly the 4g63T.

You're certainly also correct about high boost and Lancers. The two do not mix without engine work. It certainly could lead to problems, but it's all relative to the research and preparation you do before boosting.

 

especially with regards to auto trannies. the problem with my old volvo was that the majority of them were auto. the new fab with my friends is to swap over to manual cause the autos just can't take the power. some of my friends over in europe have problems with there manuals as well, and this is with a LSD, performance clutch. when you get too much power the main problem is not producing it but actually putting it on the ground.

its good that they are recirculating because even a temporary rich condition is not good for a properly tuned car.

i guess the old motto still holds true....the 2 most important things to a turbo car are COOLING and FUEL. so long as you guys have lots of that, the worst SHOULD NOT occurr.

another suggestion is water injection...i should suggest aquamist as a great starting unit...many people use it. using a mixture of water and methanol also helps to increase power and cool at the same time. long term use also reduces carbon build up inside the cylinders, but hey this is another topic all together

but since the topic was originally about compression, can i get some more info on the aftermarket pistons available???

 

any where you are looking to get pistons may as well order them now its gonna take you over 3 months to get.

 

perhaps not done on the lancer...yet. but just about every other model car that's had a turbo applied has experimented with those two options.

and i can tell you for a fact that 14 PSI is fun too, vince