I4 modification FAQ

[ssaiyan4m]

The way I'm going is to get my block ported and polished and bored to .40, J-spec intake manifold, get my throttle body bored to.65mm, cams and pulleys, turbo along w/ an intercooler and exhaust manifold.

(Practically have the whole engine rebuilt from the bottom end)

For your transmission just get a lighter flywheel and stronger clutch.

[rosecuvee]

Originally posted by ssaiyan4m
Don't supercharge or turbo the FSZE b/c its a high compression engine (I think 10:1 ratio) and would practically blow up. You could safely put NOS on it but, only go w/ a small amount like a 50 shot of NOS.

One thing there is only 1 person I know of that successfully put on the FSZE and the engine is mounted on a Ford Probe! The biggest problem w/ the engine is the wire harness!

" supercharge or turbo FSZE .... pratically blow up "
" You could safely put NOS on.. with a 50 shot ".....
is a no no... you get the whole picture wrong.


NOS , supercharge or turbo are all F/I. The basic idea is to put more oxygen into engine.

If you force more oxygen into the engine, you supply more fuel to maintain proper fuel/air ration. Go lean or rich.. neither is good.
Lean = pinging, detonation , knock... engine hate it..
Rich = Too much carbon, poor performance, need frequent oil change.... you hate it.

FSZE is a higher compression ration engine. 10:1 is a very high ratio for F/I. There are always a " F/I in high ratio engine: good or bad" argument in forums everywhere in every forums. Should you turbo a FSZE ? you should ask yourself... what did I need...

FSZE started of with 10:1 In theory... that's mean you need less boost (PSI) to reach your target HP compare to FS03 lower compression ratio... BUT... a higher compression engine need more tuning than lower compression engine... higher compression engine is less "forgiving" when you F/I your engine.

Is a long story to explain "turbo-ing higher or lower compression engine". In my book, if you just wanna 6-9 psi or boost.. I will go for FSZE or higher compression. That will give you around 210-250hp. If you are looking for BIG boost.. like 14psi or so... is recommend to go for 8.5:1 or even 8.0:1 ratio... is more "forgiving" than high compression engine.

Remember these few things:
1. More oxygen need more fuel.
2. Octane in fuel acts like rubbing alcohol... it cool the air down. The more octane.. the more it cool. ( and burn slower )
3. When you compression air... the air get hot. The more you compression.. the hotter it get. ( that's why you want lower compression in turbo + intercooler... less heat !! )
4. Power comes with responsibility.
5. You don't just turbo your car. Good engine with great power need fine tuning !!

I will say.. if you want your turbo your engine...

- if you have FSZE now : do reseach. a lot. built your turbo in correct way... FINE TUNE your car. ( because less forgiving)

- if you have FS03 now: save the money buying FSZE. buy better parts like boost controller and etc. You still need fine tune your engine.

[rosecuvee]

For nitrous... ( NOS is a company.. so does Nitrous Express and ZEX)

always start with lower shot as possible. IF you just want to kick some Mustang ass... 35 shot is plenty...kekekkee... ( and safer .... oh.. I miss the miracle of chemistry )

Most NOS kit is the same... it just come with different JETS size.. ( therefore different shot) You need 2 JETS for adjusting shot... each jets cost you $7 - $9. You can try NOS 5115 or 5123 kit.

Be safe.

peace

[parisifal]

Just want to update this post. First off, please read the entire thread before posting (i.e. rosecuvee.)

Best exhaust size would be 2.5 inch piping all the way back. Any bigger will hurt the I4 as not enough backpressure is produced. ven a turbo'ed I4 will not benefit much from anything bigger than 2.5 unless your talking aout 10+ psi of boost.

And as I have discussed numerous times, FSZE is intended for NA application as FI is more suited to the FS03. No one has sucessfully turboed an FSZE...EVER.....not here and not in Japan. Theoretically it can be done, but most people have enough of a hard time getting the damn thing running let alone do anything to it.

Tuboin at any PSI is more recommended on a low compression engine than a higer compression one. There is no point having high compression if you are using FI. Kind of like having a big horse when you intend to buy a car. There is a reason why most FI from factories comes with 9:1 or less, no FI engine i know of from a factory ever comes with anything higer than 10:1 (excluding high price exotics or one off builder, i'm talking about regular joe cars here.)

As for adding Nitrous (yes you can call it a NOS, nitrous oxide system, an acronym, not just a company, like SCUBA. But it's "a NOS", not "NOS".) And a 50 shot is recommended. a 35 is sufficient but a 50 is way better. You don't really risk anything with a 50 as it is just as safe as a 35. And who doesn't want more power.

oh whats the fastest times all u I4's owners have gotten? just curious what the I4 potential can be. oh what are you mods with your I4 you had on during ur run?

[ssaiyan4m]

Thanx parisifal for explaining what I meant as to turboing and SC an FSZE! (can't be done but, only in theory) and yes you can call someone who has a Nitrous Oxide System in their car as "NOS"

Hey Brammer I never ran my car at the track cause it probably would be embarrassing for me to do that but, there is this guy named NooClue whos SC his I4 and claims that it runs 300+Hp and he even has a website which has pics of it. Ill post it when I find it

[noocluee]

Originally posted by ssaiyan4m
there is this guy named NooClue whos SC his I4 and claims that it runs 300+Hp and he even has a website which has pics of it. Ill post it when I find it

The Link is my page And I have never claimed 300hp its more like 250. MAybe Ill reach 300hp one day when I start running the nitrous to her.

[ssaiyan4m]

My bad NooClue! It was awhile back when you told me what you estimated your hp to be!

[noocluee]

No prob man I just didnt want any **** to get started you know how some people on here can be

[madthoughtz]

from what i hear its gonna cost alot to buy all the stuff to swap the v6 apsec engine in

[ssaiyan4m]

Its not worth it! If you want a V6 in then just get another MX6 LS cause if you do the swap then not only are you going to have to change out the engine and do all the rewiring but you have to change the whole suspension on your I4 b/c the suspension is meant to hold an I4 only

[rosecuvee]

parisifal, I don't like the way you saying. I dont' have to say much. Below is the quote from Maximum Boost by Corky Bell. PLEASE READ and do reseach about HIGH compression on engine. The book can't be wrong

And I repeat, HIGH compression engine, example FSZE, can be TURBO !!!!! Honda GSR turbo is an example !!

Quote:
" In outlining engine performance desired, the first decision is the compression ratio. Comperssion ratio affects a large number of performance and driveability factors. Throttle response, economy, bhp per psi of boost, and that intangible, sweet running condition associated with engines eager for action are some of the performance factors determined in large part by the COMPRESSION RATIO. DO NOT BE HASTY TO LOWER COMPRESSION RATIOS JUST BECAUSE MOST OEMs LIKE TO DO SO. The proper compression ratio for the job is determined by lengthy thermodynamic calculation and comprehensive testing. All that good technology has its place, BUT USABLE NUMBERS CAN BE GENERATED BY SOME EXPERIENCE and will hold for most general applications. The two largest influences on compression ratio are BOOST PRESSURE DESIRED and intercooler efficiency. Fuel octane certainly plays a big part, but we are usually limited to using commercially available pump gasoline."

And again, plz start with lower shot of Nitrous before you go for 50 and above. Good luck.

peace.

[parisifal]

I never said it couldn't be done, just that it has never been done.

And i never said you were incorrect in saying you could turbo the FS-ZE. I said that it would impractical and highly advised against. Corky Bell is an awesome source of information, but boosting a high compression engine requires some pretty extreme engine management and tuning. In fact i'm pretty sure it states that outright in his book on turbos.

It's like the same ole arguemnt...."It could be done!"

But the question is do you want to? You can put a jet turbine on the Mx6 also, but do you want to? By the same token, you can boost a 10:1 engine, but do you want to? The danger, the tuning, the engine management would drive you nuts. Imagine tuning a fuel map on a low compression engine, now multiply the difficulty level a few times and you have a high compression engine. Just to ward off knock and eventual detonation would require thousands in electronics, monitoring and manegement systems. I have seen turboed engines with compression as high as 12:1 and even more in drag engines. But they are super expensive and impracticla for anyone with a wallet of normal size.

And once again, like i have stated dozens of time if you would bother to read everything. If you wanted to rubot your better off sticking with the a-spec since it has lower compression pistons. Now nothing would stop you to get everything else but the pistons. But the FS-ZE itself was never meant to be boosted, heck look at the new mazda Protege with the 9.1:1 compression. And that is an FS series engine, which basically means Mazda believes that you shouldn't turbo an FS with anythign higer than 9.1:1 compression.

ok hello again fellow 6ers,

ive been looking around/searching for another place that sells the fs-ze engine other than corksport. so far no luck. i heard about this canadian shop that sells them for a cheaper price than cork sport, but so far i have been unsuccessful to find there website.any help would be great. thanks

brammer

[SPORTMX6]

Hey,
Geat writeup, with lots of specific parts listed. I have the i4 and I hear "no mods available" unless you have the v6. I'm still trying to figure out how to work the cia with the auto tranny in the way. Someone said to take off one of the radiator fans & take the cone to the front. Any ideas?
thanks