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420A Guess the HP. Give me an estimate.

Posted by BLACK'98DSM, Jan 9, 2020

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  1. BLACK'98DSM

    BLACK'98DSM Proven Member

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    I'm going to look at a turbo'd 420a car on Saturday. I know this is a long shot but I was just wondering if anybody would know how many horses this car might be pushing.

    Mods:
    - 63mm turbo
    - blow off valve
    - catback system
    - 550cc injectors
    - cai
    - Big Blox throttle body
     

    Road Race Build 3K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

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  2. Widgmaster

    Widgmaster Supporting VIP

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    Hey Black … Just wondering if you ever heard of a program called Desk-Top-Dyno. You can feed all your info into the program ( you can even estimate 1/4 mile times ) and it will kick out your HP curve . I had it once before when I was bracket racing and it does a pretty fine job . You need to add loads of info such as weight , tire size , your weight , temperature , altitude ECT . Gives a pretty accurate reading too .
     

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  3. lasthope05

    lasthope05 Proven Member

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    I'd say no more than 180-200whp.
     
  4. BLACK'98DSM

    BLACK'98DSM Proven Member

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    On a 63mm turbo? The stock 2g turbo for GS-T is a 41mm... And 550cc injectors can handle 315 hp @ crank, which is about ~290 whp.
    I'm just curious why you think these numbers are what you guessed they are. I'm not saying that you are wrong, just asking why you think you are right.

    And I guess it would help if I told how much psi of boost it was pushing...
     

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  5. red_devil

    red_devil Proven Member

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    With the lack of information you gave us 1-1000hp.
     

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    1995 Mitsubishi Eclipse GSX
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  6. BLACK'98DSM

    BLACK'98DSM Proven Member

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    That's all the info I have. I can probably get a detailed write-up from this guy, but it's not worth it. I'm probably going to end up buying this car anyway. And then I can do some tweaking and dyno it myself. :)
     

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  7. silvreclips

    silvreclips Proven Member

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    Is the motor built or stock? Either way the 550cc injectors will run out way before the turbo does.
     

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    1998 Mitsubishi Eclipse N/T
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  8. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    That'll give you a round about idea of what it's making/limitation.
     

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  9. Kai Hefner

    Kai Hefner Freelancer

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    Along with everyone else, it's hard to say without more info. Assuming the injectors are MAXED out, I'd say ~290hp.

    Again, it's hard to say.

    Edit: Also if it's not built, it'll be way less. Pretty sure stock, boosted 420a cars blow up under 300hp or something around that guideline.
     
    Last edited: Jan 9, 2020

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  10. lasthope05

    lasthope05 Proven Member

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    Because the car isn't built and most likely will be running low boost. 7-8 psi. It's also probably also isn't tuned. Those motors and transmissions dont handle power well stock.

    Doesn't matter what the turbos inducer is or what size injectors it has. It's irrelevant in this situation with a minimum effort build or lack of information. Don't automatically assume what the injectors and turbo is capable of is what the motor is actually putting out.

    Honda guys do the same thing. Huge turbos, small injectors, low boost, substandard results.

    Also stock the 420a only make around 100-120whp so it's not a far stretch.
     
  11. streetraceboi

    streetraceboi Proven Member

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    150hp
     
  12. BLACK'98DSM

    BLACK'98DSM Proven Member

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    I don't know, he doesn't give much info.

    I will post a link to the ad tonight so you guys can look at it.
     

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  13. Evolving_sti

    Evolving_sti Proven Member

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    I was gona say the same. It's not a stout motor and Its only 140 hp from factory. dont see anything crazy coming from it if it's not built. And I dont think many people even bother building these right? Could be wrong.
     

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  14. kenuwine4g63

    kenuwine4g63 Proven Member

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    If its tuned on low boost, 240-260hp.
    If its built head, block and more boost maybe 320-340. Just depends on a lot of variables.
    If its just turbo'd with no tune and a FCD then it probably makes around 180whp.
     
    kenuwine4g63

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    1995 Mitsubishi Eclipse GST
    000.0 whp · 000.0 lb/ft · 2G DSM
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  15. BLACK'98DSM

    BLACK'98DSM Proven Member

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    Thanks guys. Looks like the deal isn't going to work out anyway.
     

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  16. Evolving_sti

    Evolving_sti Proven Member

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    Wat happened?
     

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    320 whp · 315 lb/ft · 2G DSM
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  17. BLACK'98DSM

    BLACK'98DSM Proven Member

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    I got in contact with him. He said that the engine has never been rebuilt, stock rods, stock pistons, stock ecu. He said it idles high because of the ecu. He also said that the turbo was from Ebay. And from detailed pics the engine bay looks really nasty, possible corrosion and fluid leaks.

    Even if the car was magically great, it is 5 hours away, so It's not even worth my time to go and look at it.
     

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    1998 Mitsubishi Eclipse N/T
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  18. Evolving_sti

    Evolving_sti Proven Member

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    5 hours isnt to bad. But yea that sounds terrible. Running boost on a stock ecu? No thanks

    I drove 8 hours for my evo. If your willing to travel, theres a nice red gst I just saw in the classifieds. Guy wanted 3k for it. It looks pretty clean. Might be worth a look or get it shipped.
     

    571  6

    1999 Mitsubishi Eclipse GST
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  19. BLACK'98DSM

    BLACK'98DSM Proven Member

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    It's really not that bad, but it is not worth driving that much for a POS ROFL
     

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  20. techboy

    techboy Proven Member

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    I drove a turbo'd 420A with a forged bottom end and built head for a number of years before making the switch to the 63 platform. It was a lot of work and a lot of money for not a lot of result. Probably best the deal fell through.

    That said, there are a few guys around doing it, and I commend them. Definitely the harder way to go.
     

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  21. Evolving_sti

    Evolving_sti Proven Member

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    Curious but what was the turbo setup and hp on it? Was it reliable when it was all said and done?
     

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    1999 Mitsubishi Eclipse GST
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  22. silvreclips

    silvreclips Proven Member

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    @Evolving_sti there are still a few of us hanging around here. I put down 340whp on a 20g. Built bottom end, refreshed head, stock cams etc, megasquirt ECU.

    A well built system will be reliable.
     

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