Reply to Thread

Post a reply to the thread: 2.5 upgrade, does it is worth it ???

Your Message

Click here to log in

Please correctly re-type the phrase f o o t d o c t o r in the form box. Re-type it without the extra spaces and put the one space where it should be. We apologize for having to do this but this silliness helps slow the spammers.


Additional Options


Topic Review (Newest First)

  • 03-30-2006, 02:27 PM

    Re: This is not the issue, does it is worth it?

    Corrajem3, you know what you have to do here. Rebuild the engine to 2.3 or 2.5L( my choice) and add it an Alpha-N system with the CF plenum to wake-up those ponnies. Enjoy the life!

    Best, Jose.
  • 03-27-2006, 02:54 PM

    cost of a "2.5l"

    if youve never built an engine before, one may be suffering
    from delusions what a real build up costs. This is an attempt
    to explain a few issues.

    step 1: realize that a "2.5l" as such does not exist. There are
    quite a few variations of 2.5l out there, some even have the
    same specs/parts but they differ in build quality non the less.

    step 2: realize there is no "kit" per-se. you can buy a 2.5l crank
    at the dealer yourself.

    step 3: realize you first need to upgrade a lot of peripheral parts
    before you can call it a "real 2.5". e.g., things like
    TBs and header/exhaust system. If you stick with the AFM,
    then you should get an E3 AFM with the larger 300cc injectors.
    slapping on a stock head on to a 2.5l is about the worst way
    to build a 2.5.

    step 4: realize your engine actually needs a full rebuild before
    tuning/modding it. you know, things like timing chain gear needs
    replacing, or the head needs new valve guides, stuff like that.
    these are "base level costs" that are incurred on ANY engine
    rebuild, including stock engine rebuilds.

    most people that go with highly tuned engines end up with all
    new (or nearlz all new) parts. they just replace everything.
    on the "high hp" S14s, there is merit in using an EVO3 block
    e.g. there is also merit in using oil squirters.

    unfortunately, if you havent done this before you are going to
    go shopping and surfing catalogues. a big fat warning: dont
    go with someone just because they quote silly hp numbers, these
    are unrealistic for the hardware used. HP does not simply add up
    with the number of mods done. That is my advice.


  • 03-26-2006, 11:52 PM

    If it is within your means.......

    I've always said that if my motor ever goes, I will do the 2.5 upgrade. I know turner has a basic kit for about $2500. As long as you don't get to crazy, I think you could maybe get every thing you need for the bottem end, and leave the top as is. Maybe just add bigger injectors. Of course, these things do have a way of getting out of hand. If I had the money....
  • 03-02-2006, 04:02 PM

    here is a video of modified 2.5l

    video here (WMV format)

    click here

    on that setup gearing is as follows:
    1st gear goes to 45 mph
    2nd gear 67 mph
    3rd gear 94 mph
    5th gear rev limited at about 162 mph @ 8500 rpm

  • 02-28-2006, 06:28 PM

    Re: 2.5 upgrade, does it is worth it ???

    I finished my 2.5 last summer and have put 1900 miles on it so far. If you do it right, it is well worth it to me. The new motor ROCKS! VAC stage 3 head with stock valves, cams, 2.5 kit etc. For all required components expect to spend 7-10k to do it yourself(assembly) add 2.5k for somebody else to put it together. However, it puts a ridiculous grin on my face whenever I rip it sideways. It is all good to me.
  • 02-27-2006, 11:22 PM
    Bob Thomas

    I'm going to Knob Creek & may want to

    spend the money on another machine gun
  • 02-27-2006, 09:43 PM

    This is not the issue, does it is worth it?

    I have a 1989 Turbo, and performance is not the issue. M3 e30 are cars with a special suspension which are the envy of any high performance car, but spending 5-6 thousand in an overhaul with a gain of only 60 HP, is to be considered????

  • 02-27-2006, 07:47 PM

    if you got the money why are you asking?

  • 02-27-2006, 06:34 PM
    Bob Thomas

    I'm facing the same delimma & would like

    some input too. It'll be tempting "while you're in there" but I can see the costs rapidly escalating. Suggestions?
  • 02-25-2006, 11:09 PM

    2.5 upgrade, does it is worth it ???

    I need to repair the motor of my E30 M3. I want to go with the 2.5lt upgrade. Do you think that it is worth it pay so much $$$ for it, compared with the gain, or you understand that it is more practical to just repair my current motor?? Iused my car on a daily basis.

    What you think?


    1988 Henna Red M3

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
1e2 Forum