alright all, im in the process of talking to someone about a trade for a turbo kit. my question is how safe/reliable for the engine is it to boost without any internal mods. as far as i know stock internals on the 420a can only handle 8psi right? so run at 8psi 2.5inch exhaust, tuned from first start up. how safe is it? or should i just wait and do it once my spare 420 is built? i'd appreciate any input. thanks

The internals should be fine @ 8 psi, but it might be pushing it on the injectors. They are pretty close to being maxed out around 8 to 9 psi. I would never go any higher than 8 psi though, once you go past that then you have to worry about spinning a bearing. I boosted 10-12 psi on stock internals and spun a bearing in under a week. But, of course that was back when I was young and dumb.

its a 97 rs and im in the process of putting a used engine with 86,000. its from a mitsubishi dealership so its warranteed. so i know its in good shape. what do you recommend for fmu and fuel pump?

If you didn't want to go stand alone I would recommend a Vortech SFMU. Fuel pump I have a Walbro 255hp. Some people have had problems with Walbro; I havn't so far so I am sticking with it.

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EVO IX - just a really expensive boost gauge and a K&N air filter
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95 Eclipse GS - parts car
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its a 14b. star long route piping. and ya i know the dealership probably wouldnt cover the warranty for engine failure if i boosted. i just needed some opinions on whether its a good idea. and what the best way to go about it is. also what kind of hp gains am i looking at with a good tune? thanks

I contributed to the Wiki!
EVO IX - just a really expensive boost gauge and a K&N air filter
96 Eclipse RS -awaiting registration and inspection
95 Eclipse GS - parts car
Mods/Profile - http://www.2gnt.com/index.php?d=cs82685

been boosting 6-8 for over 2years now on stock block

LED tails : Done for now!
99 eclipse rst
cobalt blue met. paint,star stage 2 upgraded t3/t460trim turbo ceramic coated , polished compressor housing, ,optima yellow top, chrome i/c piping ,front mount ntercooler ,apexi turbo timer . zeitronix wb02 ,faze oil ,boost gauge,egt ,bosch 4x plugs,kyb agx struts, pro kit springs.17''adr venomous rims,Falken azenis ,brembo dilled/slotted rotors ,turbo xs bov ,oil catch can,manual shiftknob,autometer pyrometer egt , vortech sfmu,b&m fuel pressure gauge ,accel 310cc injectors ,gasketmatched and polished intake manifold ,58mm throttle body ,no egr,polished turbonetics wastegate,fuel pump rewire,homade fcd and a lot more .LED reverse lights ,sidemarkers and tails .atx to mtx swap . South bend tz clutch . Tons more
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Try to stay away from the FMU and go to the SFMU. You want to be able to adjust you fuel and with the FMU you can't unless you change the disks and the injectors. Also, I would say that you should change the injectors that way they are not being over worked and you will have less chance of messing them up. So up the injectors and get the SFMU and you should be in good shape, plus it will set you up in the future if you want more power, cause you will.