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Thread: BMW turbo street car Drag Racing 101

  1. #51
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    Finally read the whole thing. Great tips, very nice of you to write all of this up. Thanks!

    -Chris

  2. #52
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    Quote Originally Posted by MrBlonde View Post
    Drew's E36 M3 unmodified bodywork with Hoosier QuickTime Pro DOT in 26"x9.5"-16

    WHERE did you get those rear 16 inch replica contours? i have been lookin all over for them and cant find them. i need two, im doing the same thing
    This space for rent.

  3. #53
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    great tips

  4. #54
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    What fuel is what?

    To help people understand what fuels are what for a turbo BMW here are some facts. Note that it's not as simple as "the higher the octane the better". Many other factors come into it.

    Please take a look at the VP Racing Fuels site

    Unleaded Fuels

    MOTORSPORT 109
    Produces more power than any other unleaded fuel. Recommended for higher boost applications with CRs up to 11:1 or naturally aspirated engines up to 13:1.

    • Color: Clear
    • Motor Octane: 101
    • R+M/2: 105
    • Research Octane: 109
    • Oxygenated: Yes
    • Specific Gravity: .722 at 60 F

    Streetblaze 100
    Oxygenated with ethanol, this CARB-legal fuel is specifically engineered for high-performance street cars including sport compacts, muscle cars, street rods and more. It's environmentally friendly and street legal throughout the U.S. In applications with anything from 4- to 12-cyclinders or engines equipped with a turbocharger, supercharger or nitrous oxide system (NOS), StreetBlaze 100 will generate optimum power and performance. In turbocharged or supercharged applications, it allows an increase in boost without fear of detonation. NOS users can also leverage their higher octane ratings to step up to a more powerful nitrous oxide system. Dyno tests with a turbocharged application proved StreetBlaze100 generates up to 14% more horsepower compared to premium grade 91 octane unleaded gasoline. Designed for use in cast-iron head engines with CRs up to 13:1 and aluminum head engines up to 14:1. Works well on the latest generation of electronically-controlled turbo engines. Contains no metal compounds and won't harm catalytic converters or oxygen sensors.

    • Color: Orange
    • Oxygenated: Yes
    • Motor Octane: 96
    • R+M/2: 100
    • Specific Gravity: .746 at 60 F

    MOTORSPORT 101
    This 101 octane (R+M/2) fuel allows an increase in timing and more powerful nitrous oxide systems, with substantial power increases compared to premium pump gas. Designed for CRs up to 13:1 in cast-iron head engines and up to 14:1 with aluminum heads, MS101 is particularly effective in turbo- and supercharged applications. It contains no metal compounds and won't harm catalytic converters or oxygen sensors.

    • Color: Yellow
    • Motor Octane: 99
    • R+M/2: 101
    • Oxygenated: Yes
    • Specific Gravity: .800 at 60 F


    MOTORSPORT 103
    MS103 provides power and protection equal to some leaded racing fuels. Compared to Motorsport 101, it allows even more aggressive timing and higher compression-up to 14:1 in cast iron head engines and up to 15:1 with aluminum heads. Can allow doubling of stock boost - consult your engine builder. Also contains no metal compounds and won't harm catalytic converters or oxygen sensors. AMA legal for Supercross & Outdoor Nationals.

    • Color: Red
    • Motor Octane: 99
    • R+M/2: 103
    • Oxygenated: Yes
    • Specific Gravity: .743 at 60 F


    Leaded Fuels

    C16
    Used in turbocharged engines, blown engines and nitrous applications with CRs up to 17:1. Recommended by the top nitrous oxide companies. Spec Fuel for NHRA Comp Eliminator.

    • Color: Blue
    • Motor Octane: 117
    • Specific gravity: .735 at 60 F


    VP Import
    Maximum power and torque in small displacement, high RPM, all motor, turbocharged or nitrous sport compact applications. Makes 5% more power than C16 and similar nonoxygenated fuels. Works well under high temperatures due to mechanical heat.

    • Color: Clear
    • Motor Octane: 120+
    • Specific Gravity: .744 at 60 F
    .-=[ Kenny ]=-. See the BFc Drag Racing Standings List for BMW street cars. Watch my drag racing movies on YouTube. Some info on
    BMW turbo street car Drag Racing 101

  5. #55
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    way to go on the write up man.

  6. #56
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    Gearing for drag racing 101

    Gearing Basics
    To determine your optimum gearing you need to know the following:

    + The rubber under your rear guards
    + Your engine's redline
    + Your gearbox ratios
    + Your diff ratio
    + Your car's trap speed on it's best ever pass

    Given that the optimum rubber you can fit under your BMW street car for drag racing purposes is the tallest and widest rubber that will fit, click on the link in my sig to find the optimum rubber for your car (or look for the post near the top of this thread).

    You must work out what gearbox you are running and what the gearing is for each gear. It's also important to note whoch gear is your 1:1 gear. Optimally you want to be one car length past the finish line when you hit redline in your 1:1 gear.

    Once you know your engne redline, optimum rubber and your gearbox ratios, you can then calculate the best diff ratio, given that you know the best trap speed you've ever hit. If you expect to make mods to improve your trap speed, then go test it before changing your diff rato.

    Your objective is to calculate what diff ratio will give you 1-2 MPH higher than your best ever trap speed at redline in your 1:1 gear. There are a limited choice of diff ratios available depending on what BMW model you have. You may end up finding a great match in the gear lower than your 1:1 gear (for example 4th rather than 5th). Or you may end up more than 1-2 MPH under your best trap speed. That's OK, you are working towatrds your optimum setup and doing the best you can.

    For specific examples or calculations just post a request thread and I will help.
    .-=[ Kenny ]=-. See the BFc Drag Racing Standings List for BMW street cars. Watch my drag racing movies on YouTube. Some info on
    BMW turbo street car Drag Racing 101

  7. #57
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    Guys, last night I fit a set of Hoosier slicks on my car(Kenny, I'll post pictures and sizes for your thread) but, the car got crazy.

    It felt unstable even at 80mph.

    I was running 20psi in the slicks and street radials up front.

    Do I have to run skinnies? If not, what are other people using?

    -Dave
    TEC-3R, T4 GT40 "Blowzilla"

    426whp/405tq....93 octane 14psi
    528whp/482tq....93 octane+Meth 19psi
    542whp/513tq....110 octane+Meth 22psi

    Stock motor + Turbo = 11.094 @ 130mph


  8. #58
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    Quote Originally Posted by trthrrt489 View Post
    Guys, last night I fit a set of Hoosier slicks on my car(Kenny, I'll post pictures and sizes for your thread) but, the car got crazy.

    It felt unstable even at 80mph.

    I was running 20psi in the slicks and street radials up front.

    Do I have to run skinnies? If not, what are other people using?

    -Dave
    What you need to do is grab a bicycle pump with a needle on the other end of the tube...stick the needle into your scrotum and start pumping.

    I kid...but yeah, skinnies needed or just hold on at WOT and hope you don't die.
    Where have I been? Astral projecting.

    Quote Originally Posted by jszy25 View Post
    Get drunk with Mike Radowski they said, it'll be fun they said...A broken toe, the worst hangover known to man, and bite marks in my arm said otherwise

  9. #59
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    Quote Originally Posted by highboostingm3 View Post
    What you need to do is grab a bicycle pump with a needle on the other end of the tube...stick the needle into your scrotum and start pumping.

    I kid...but yeah, skinnies needed or just hold on at WOT and hope you don't die.


    I might need to stick with DR's

    -Dave
    TEC-3R, T4 GT40 "Blowzilla"

    426whp/405tq....93 octane 14psi
    528whp/482tq....93 octane+Meth 19psi
    542whp/513tq....110 octane+Meth 22psi

    Stock motor + Turbo = 11.094 @ 130mph


  10. #60
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    Quote Originally Posted by trthrrt489 View Post


    I might need to stick with DR's

    -Dave
    General consensus says to not mix bias ply tires with radials. I've seen ti work without a problem, but I've seen video's of it being a problem too.

    Also, did you get them hot first? I've noticed that if I don't heat up my DR's then my back end is all over the place.
    Kurt for Congress in 2020


  11. #61
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    Quote Originally Posted by ParadigmGuy View Post
    General consensus says to not mix bias ply tires with radials. I've seen ti work without a problem, but I've seen video's of it being a problem too.

    Also, did you get them hot first? I've noticed that if I don't heat up my DR's then my back end is all over the place.
    The slicks were cold. I was crusing to check for rubbing.

    I stood on them a few times and lost grip. I tried to hold the throttle down to see what they would be like at 120+, but, I didn't make it past 80 mph.

    I used DR's once and they seemed "fine" not squirrley at all.

    Should I try to let air out of the fronts?

    -Dave
    TEC-3R, T4 GT40 "Blowzilla"

    426whp/405tq....93 octane 14psi
    528whp/482tq....93 octane+Meth 19psi
    542whp/513tq....110 octane+Meth 22psi

    Stock motor + Turbo = 11.094 @ 130mph


  12. #62
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    Don't mix slicks with radials. Your front runners should be at a high pressure, and your slicks should start out at a fairly high pressure and gradually reduced.

    On our cars we have relatively very small slicks with relatively very heavy cars. Racing slicks were designed for much lighter race cars that can fit much larger slicks.

    So start with 24 or 26 psi in your slicks and reduce by 1 psi until your short time gets worse. Do not listen to those who tell you they run 6 psi in their car ... their car probably weighs 2100 lbs.
    .-=[ Kenny ]=-. See the BFc Drag Racing Standings List for BMW street cars. Watch my drag racing movies on YouTube. Some info on
    BMW turbo street car Drag Racing 101

  13. #63
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    Quote Originally Posted by trthrrt489 View Post
    The slicks were cold. I was crusing to check for rubbing.

    I stood on them a few times and lost grip. I tried to hold the throttle down to see what they would be like at 120+, but, I didn't make it past 80 mph.

    I used DR's once and they seemed "fine" not squirrley at all.

    Should I try to let air out of the fronts?

    -Dave
    I wouldn't recommend letting air out of your fronts. The problem is that they were probably cold. They need a lot of heat to have traction.
    Kurt for Congress in 2020


  14. #64
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    Kenny, here are some pics of the 26x8x15 Hoosier slick fitted under stock M3 bodywork. My fenders are not rolled, but, could use it.









    -Dave
    TEC-3R, T4 GT40 "Blowzilla"

    426whp/405tq....93 octane 14psi
    528whp/482tq....93 octane+Meth 19psi
    542whp/513tq....110 octane+Meth 22psi

    Stock motor + Turbo = 11.094 @ 130mph


  15. #65
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    OK, so what rims are you running and did they fit over the stock calipers or did you have to do some sort of surgery to them?
    1999 M3
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    RIP --- 98 ///M3 Mods:- Eurosport TS - (EVO)Euro 6-speed

  16. #66
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    Quote Originally Posted by trthrrt489 View Post
    Kenny, here are some pics of the 26x8x15 Hoosier slick fitted under stock M3 bodywork. My fenders are not rolled, but, could use it.
    ..
    -Dave
    Dave,

    Can you confirm you are using Hoosier Drag slicks part # 18110 in 26.0/8.0-15
    Tread width: 8.0"
    Diameter: 26.1"
    Circumference: 82"
    Recommended rim: 7-8"
    Section width: 9.7"
    .-=[ Kenny ]=-. See the BFc Drag Racing Standings List for BMW street cars. Watch my drag racing movies on YouTube. Some info on
    BMW turbo street car Drag Racing 101

  17. #67
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    Quote Originally Posted by MrBlonde View Post
    Dave,

    Can you confirm you are using Hoosier Drag slicks part # 18110 in 26.0/8.0-15
    Tread width: 8.0"
    Diameter: 26.1"
    Circumference: 82"
    Recommended rim: 7-8"
    Section width: 9.7"
    Yep!

    -Dave
    TEC-3R, T4 GT40 "Blowzilla"

    426whp/405tq....93 octane 14psi
    528whp/482tq....93 octane+Meth 19psi
    542whp/513tq....110 octane+Meth 22psi

    Stock motor + Turbo = 11.094 @ 130mph


  18. #68
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    Quote Originally Posted by MoeMuny View Post
    OK, so what rims are you running and did they fit over the stock calipers or did you have to do some sort of surgery to them?
    E30 M3 rims, yes grind the heck out of the caliper then run 5mm spacers.

    -Dave
    TEC-3R, T4 GT40 "Blowzilla"

    426whp/405tq....93 octane 14psi
    528whp/482tq....93 octane+Meth 19psi
    542whp/513tq....110 octane+Meth 22psi

    Stock motor + Turbo = 11.094 @ 130mph


  19. #69
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    Unfortunately I've lost the permissions to edit my previous posts .. not sure if this is temporary or not. I cannot update the rubber fitment post with this new information Dave.
    .-=[ Kenny ]=-. See the BFc Drag Racing Standings List for BMW street cars. Watch my drag racing movies on YouTube. Some info on
    BMW turbo street car Drag Racing 101

  20. #70
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    Quote Originally Posted by MrBlonde View Post
    Unfortunately I've lost the permissions to edit my previous posts .. not sure if this is temporary or not. I cannot update the rubber fitment post with this new information Dave.
    PM a mod, maybe they can either go in and edit it for you, or can make it so you can still edit it.
    Kurt for Congress in 2020


  21. #71
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    Quote Originally Posted by trthrrt489 View Post
    Kenny, here are some pics of the 26x8x15 Hoosier slick fitted under stock M3 bodywork. My fenders are not rolled, but, could use it.
    -Dave
    Thanks a ton for being the first to show a slick that fits under stock e36 bodywork!
    Where have I been? Astral projecting.

    Quote Originally Posted by jszy25 View Post
    Get drunk with Mike Radowski they said, it'll be fun they said...A broken toe, the worst hangover known to man, and bite marks in my arm said otherwise

  22. #72
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    Quote Originally Posted by ParadigmGuy View Post
    PM a mod, maybe they can either go in and edit it for you, or can make it so you can still edit it.
    Not sure if you've noticed but the BFc moderators and I aren't best pals.
    .-=[ Kenny ]=-. See the BFc Drag Racing Standings List for BMW street cars. Watch my drag racing movies on YouTube. Some info on
    BMW turbo street car Drag Racing 101

  23. #73
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    Quote Originally Posted by MrBlonde View Post
    Not sure if you've noticed but the BFc moderators and I aren't best pals.
    I think that with time we lose the ability to edit posts. They'll probably come through for the good of the forum.

    Edit: I PM'd an FI for ya.
    Last edited by ParadigmGuy; 09-18-2007 at 04:16 AM.
    Kurt for Congress in 2020


  24. #74
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    great writeup

  25. #75
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    Quote Originally Posted by MrBlonde View Post
    Not sure if you've noticed but the BFc moderators and I aren't best pals.




    sounds like our Government
    This space for rent.

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