bmw m20 turbo in the 11 seconds???

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  • ForcedFirebird
    R3V OG
    • Feb 2007
    • 8300
    #31
    Originally posted by raudonis
    Eta crank is cast iron - no good, better of with forged crank from diesel m21d24. Stock rods - nothing good as well, better of with cheapest forged ebay rods from china. Pistons must be SuperEta (compound shape like b25) to work with 885 head properly.

    For strong rear end adapt e34 rear, you will be needing 210mm diff anyway.

    Sent from my GT-S5570 using Tapatalk 2
    The stock cast crank is fine. People have been making 500hp on them for a long time now.
    john@m20guru.com
    Links:
    Transaction feedback: Here, here and here. Thanks :D

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      • bmwgt123
        Noobie
        • Oct 2014
        • 20
        #32
        Originally posted by raudonis
        People do it all the time and always get mediocre results. Use 731 head if you insist on keeping flat top pistons.

        Sent from my GT-S5570 using Tapatalk 2
        maybe for NA is not a good combo, but for F/I im looking for a low cr

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          • ForcedFirebird
            R3V OG
            • Feb 2007
            • 8300
            #33
            Don't worry about CR. The m20b25 only has 8.8:1, seta has 8.5:1 and you will be at 8.4:1 with an eta/i hybrid. If anything the compression in an m20 should be raised, not lowered. I have had great success in boosting cars with as much as 9.7:1. You will make more power in boost, and more importantly, more power in low boost.
            john@m20guru.com
            Links:
            Transaction feedback: Here, here and here. Thanks :D

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              • einstein57
                R3V OG
                • Jun 2007
                • 10780
                #34
                Originally posted by raudonis
                Eta crank is cast iron - no good, better of with forged crank from diesel m21d24. Stock rods - nothing good as well, better of with cheapest forged ebay rods from china. Pistons must be SuperEta (compound shape like b25) to work with 885 head properly.

                For strong rear end adapt e34 rear, you will be needing 210mm diff anyway.

                Sent from my GT-S5570 using Tapatalk 2
                I have yet to hear of anyone breaking an m20 crank. I've read about a broken m21 crank once.
                Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.

                www.gecoils.com
                My euro 316 project Transaction Feedback

                  Comment

                  • OOMPH!
                    No R3VLimiter
                    • Oct 2003
                    • 3487
                    #35
                    Originally posted by IronFreak
                    Anyone that would suggest a forged Chinese rod over something stock holds no credibility in my book. At least with oem you know what your getting.
                    +1 My thoughts exactly.

                    SOLD: My feature http://www.stanceworks.com/2012/04/a...ss-bmw-e30-m3/

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                      • bmwgt123
                        Noobie
                        • Oct 2014
                        • 20
                        #36
                        Originally posted by einstein57
                        I have yet to hear of anyone breaking an m20 crank. I've read about a broken m21 crank once.
                        x2 i hear this too

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                          • bmwgt123
                            Noobie
                            • Oct 2014
                            • 20
                            #37
                            people, can i fit a 26x8.5 15" slick, without spacers?

                              Comment

                              • DER E30
                                R3VLimited
                                • Sep 2013
                                • 2343
                                #38
                                Originally posted by bmwgt123
                                people, can i fit a 26x8.5 15" slick, without spacers?
                                All in the wheel offset/height I'd imagine.
                                -Christian

                                '02 ///M3 CarbonSchwartz 6MT daily beast
                                08/91 Mtechnic II 325IC alpine/lotus
                                318iS, slow build/garage queen...
                                '37 Chevy pickup, the über project
                                Originally posted by roguetoaster
                                Be sure to remind them that the M42 is one of the best engines ever made, but be sure to not mention where it actually falls on that list.

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                                  • lcoleman
                                    Grease Monkey
                                    • Jan 2009
                                    • 331
                                    #39
                                    Ditch all the weight you can and really, really focus on the rear suspension and I think it's possible, even with ~350 horsepower.

                                    Wheel hop and broken parts will be your biggest issues IMO.

                                      Comment

                                      • AusScare
                                        Wrencher
                                        • Jun 2014
                                        • 220
                                        #40
                                        What sort of street tyres would put down 400whp in 2nd or 3rd gear?

                                        235/40/17 semi slicks?
                                        '90 318is

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