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  1. #76
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    Click here to enlarge Originally Posted by UK M3 Click here to enlarge
    OK, so with 95 pump gas here, what is the comp. ratio we should be aiming for, spinning the Ysi to max?
    I'd ask your tuner but I wouldn't advise less than 10.0:1

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  2. #77
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    I'd ask your tuner but I wouldn't advise less than 10.0:1
    I think i will question that ratio and here is why.

    The final compression ratio of 10:1 plus 25psi of boost would make it 27:1. Now on 91/93 us pump gas, i cant see that happening.

    Alot of cars using boost only seem to go to high 19's / low 20's in standard form. Example would be the 1M making 14.5psi on a 10.2:1 ratio comes in at 20.26.

    The 911 997 TT makes 14.5psi with 9.8:1 ratio is 19.47.

    Even an Ess 550 kit on the S54 is 9 psi on 11:0 and that is 17.13.

    All the above cars run on 93us pump gas and 2 of them are standard.

    I was looking at a ratio of 8:1 with 25psi which makes 21.61 final compression ratio. A little outside of the final ratio but we do have 99ron in the UK.

    Modded 997TT 9.8:1 with 17.4psi is 21.4.

    I understand that with meth / higher octane fuels you could run a high compression but these cars are going to be used mainly on 99ron so are being built around that fuel. Meth will also be used but im not sure if i would want to depend upon it.

    I know there will be a less response with 8:1 but with the charger setup it will be making boost of around 4psi @ 1k revs so with the added air there shouldnt be much of a problem, unless im missing something?

    Simon
    Last edited by Si83; 08-07-2013 at 02:07 PM. Reason: I should read what iwrite first of all :D

  3. #78
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    1 out of 1 members liked this post. Yes Reputation No
    Nice write up Si, some good examples there.
    Would rep ya but don't have enough points, so have a smiley face instead. Click here to enlarge

    Whilst I'm here - pics from todays visit to BMW
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  4. #79
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    9,5:1-10:1 and 22 -23 psi & pump gas is possible

    if you have

    good knock control
    good ignition mapping
    cold plugs.

    I was able to put down 865 whp on Dynamics dyno on pump gas, 25 psi. Neel from apexspeed was next to me and
    he called his friends in the States to tell about S54 pump gas 865 whp. Thats like 1000 whp on dyno jet.
    E36 M3 Euro TT 60-130 mph 4.49 s
    E46 M3 3.6L TT 60-130 mph 4.22 s
    All Wheel drive M3 Twin Turbo
    997 TT



  5. #80
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    Click here to enlarge Originally Posted by Si83 Click here to enlarge
    I think i will question that ratio and here is why.

    The final compression ratio of 10:1 plus 25psi of boost would make it 27:1. Now on 91/93 us pump gas, i cant see that happening.

    Alot of cars using boost only seem to go to high 19's / low 20's in standard form. Example would be the 1M making 14.5psi on a 10.2:1 ratio comes in at 20.26.

    The 911 997 TT makes 14.5psi with 9.8:1 ratio is 19.47.

    Even an Ess 550 kit on the S54 is 9 psi on 11:0 and that is 17.13.

    All the above cars run on 93us pump gas and 2 of them are standard.

    I was looking at a ratio of 8:1 with 25psi which makes 21.61 final compression ratio. A little outside of the final ratio but we do have 99ron in the UK.

    Modded 997TT 9.8:1 with 17.4psi is 21.4.

    I understand that with meth / higher octane fuels you could run a high compression but these cars are going to be used mainly on 99ron so are being built around that fuel. Meth will also be used but im not sure if i would want to depend upon it.

    I know there will be a less response with 8:1 but with the charger setup it will be making boost of around 4psi @ 1k revs so with the added air there shouldnt be much of a problem, unless im missing something?

    Simon
    Well what I'd say you are missing is that you also make less horsepower per pound of boost with less compression and off boost driving is worse. If it's a turbo setup higher compression will spool faster and on a centrifugal I personally hate how it feels down low as is and less compression would just make that worse.

    If you have strong internals and are managing the cylinder pressure I definitely say go higher than lower. Up to the tuner and him though I just wouldn't go lower than 10.0:1

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
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  6. #81
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    Click here to enlarge Originally Posted by Twinturbom3 Click here to enlarge
    9,5:1-10:1 and 22 -23 psi & pump gas is possible

    if you have

    good knock control
    good ignition mapping
    cold plugs.

    I was able to put down 865 whp on Dynamics dyno on pump gas, 25 psi. Neel from apexspeed was next to me and
    he called his friends in the States to tell about S54 pump gas 865 whp. Thats like 1000 whp on dyno jet.
    Am I right in thinking you was between 9.5-10:1 compression?

    im just trying to find a safe but decent power result.

    Thanks for the help guys btw. It's the reason why I'm here. I can throw up questions and actually get a proper response from people who have done the work. Click here to enlarge

    mr uk m3, the car is coming alone nicely. Can't wait to get home and look at the pics on a bigger screen.

  7. #82
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    ...cheers Si.

    Out of curiosity what comp. ratio are you running Sticky?

    Maybe time to get some Supra numbers together?

  8. #83
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    Click here to enlarge Originally Posted by UK M3 Click here to enlarge
    ...cheers Si.

    Out of curiosity what comp. ratio are you running Sticky?

    Maybe time to get some Supra numbers together?
    10.0:1

    I bought ToyotaBoost.com...

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
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  9. #84
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    2 out of 2 members liked this post. Yes Reputation No
    Got the car back last week. Not to every ones taste but I like it.
    Need to get the coilovers back on and get on with the engine build.
    Click here to enlargeClick here to enlargeClick here to enlargeClick here to enlarge

  10. #85
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    Looks wicked! Love VARIS Parts.
    Click here to enlarge



    EURO 04 M3 Current Mods:GC DAs, Eibach Sways, PF RTAB's, RE RCAs, INTRAVEE II, Black Roundels, ///MFEST Badges, Depo's, Screen protector for NAV display, VCSL Bumper + Race Lip & CF Trunk & CF Rear Diffusor, DIETZ TV in Motion, SS= V1 Headers + catless pipes + X-Pipe + SS Sport Exhaust, Z8 Starter Button, Lamin-X, OEM CSL interior, OEM CSL Steering, OEM CSL Intake, OEM CSL Roof, MSS54HP + OEM CSL Tune, BBS CH's, LIGHTWERKZ, 355mm ST40 BBK, BW Oil Cooler....

  11. #86
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    Thanks. The Varis parts are excellent with fitment like oem.

  12. #87
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    It's been a while but I/we've come up with a plan. The engine build will be going TT, (Tial).
    Currently the spare engine is away being built and will be ready for summer.
    My question is this; without having an adverse effect on 60-130 times, how lower final drive ratio I can get away with, on a 1000hp crank S54?

  13. #88
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    Click here to enlarge Originally Posted by UK M3 Click here to enlarge
    My question is this; without having an adverse effect on 60-130 times, how lower final drive ratio I can get away with, on a 1000hp crank S54?
    Well we need to take a look at the gearing. With that much power though going to longer gears isn't going to hurt you. If you can reduce your shifts even by 1 in that span it will help. You will have more than enough torque.

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
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  14. #89
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    Final drive ratios available for E46 are; 2.93, 3.07, 3.15, 3.23, 3.38, 3.46, 3.62.
    Need to confirm if they will all fit the M diff.
    Ratios 2.93 and 3.07 requires 2 shifts and the others require 3.

    I suppose I need to hear from guys with 800+whp E46 S54s, that have tried to achieve a competitive 60-130 time.
    What final drive where they using?
    When doing the run, how wary did they have to be, on the throttle pedal, to avoid wheel spin?

  15. #90
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    Well wheel spin is definitely going to be the biggest hurdle.

    I mean I'd just go the longest you can.

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
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  16. #91
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    So the lowest I've found is 2.81.

    Been looking into diffs. Can anyone suggest a quality Torsen type diff?

    Got some pics from the Tuner...
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    Last edited by UK M3; 03-04-2015 at 08:56 PM.

  17. #92
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    Click here to enlarge Originally Posted by UK M3 Click here to enlarge
    Been looking into diffs. Can anyone suggest a quality Torsen type diff?
    Where have you been looking? You may want to talk to Dan @ diffsonline

  18. #93
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  19. #94
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    Click here to enlarge Originally Posted by UK M3 Click here to enlarge
    Nothing wrong with that.

  20. #95
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    It looks like I will be using the Quaife diff mated to 2.81 final drive, when I get to that part. 2.81 as a starting point.

    Full ProEFI, clutch, flywheel now purchased.
    Custom oil cooler being fabricated.
    Intake, exhaust, turbo housing and all associated pipes to be ceramic coated.

    Need to talk to Drexler about axles.

    What I really want though is a Drenth DG500 or MPG sequential box. I know they are noisy but I think that there are more pros...
    Lighter,
    Stronger,
    Faster,
    Flat shift,
    Rev match.
    The car isn't going to be quiet running 900hp crank, hopefully, twin turbo top mount.

    I really can't wait.

  21. #96
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    Nothing major. These manifolds were designed to flow. And they do that very well.

  22. #97
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    Maybe so. What manifolds? Mine are custom fabricated.
    You do realise my car is RHD?

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