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Thread: How much overdrive should I run??

  1. #1
    Join Date
    Apr 2012
    Location
    Michie, TN
    Posts
    133

    How much overdrive should I run??

    Hey guys, this is my first technical thread, so bare with me please. I am finishing up a motor build for my 90 sc 5 speed and I am wondering what would anyone's recommendation be on how much over drive would be good for my car. Here are my modifications:

    .30 over Wiseco pistons with 94 rods
    stock crank
    custom grind cam, springs, and pushrods from DD
    home port and polished heads
    5 angle valve job
    75MM tb
    port matched intake to 75MM tb
    76MM MAF
    42 pound injectors
    255lph walbro fuel pump
    chip from DD
    gasket set and arp head studs from DD
    3" cai
    front mount intercooler w/2.75" piping
    ported exhaust manifolds
    full 2.5 catless exhaust w/megan racing mufflers
    Sniper wet nitrous system (not sure on what shot yet, or if I'm even going to spray it or not)

    Stock blower for now with 5% pulley and some port work, I don't have the money right now for a better blower, so for now, I'll have to run this blower. I was thinking maybe a 10% jackshaft pulley with my 5% sc pulley? I'd love to hear some opinions from some guys that have the similar set up! any input on what else I should or anything would be great, thanks in advance!

  2. #2
    Join Date
    Feb 2003
    Location
    Tinton Falls, NJ
    Posts
    1,490
    With a stock blower, there is definitely no need to run more than 10%, and there may not be any benefit running more than 5%. I would say put it back together with the 5% pulley, and see how it runs, then if you want to try more OD, get the 10% jackshaft pulley and put the stock blower pulley back on, and see which one performs better.

  3. #3
    Join Date
    Oct 2012
    Location
    columbus ohio
    Posts
    113
    Quote Originally Posted by smith181992 View Post
    Hey guys, this is my first technical thread, so bare with me please. I am finishing up a motor build for my 90 sc 5 speed and I am wondering what would anyone's recommendation be on how much over drive would be good for my car. Here are my modifications:

    .30 over Wiseco pistons with 94 rods
    stock crank
    custom grind cam, springs, and pushrods from DD
    home port and polished heads
    5 angle valve job
    75MM tb
    port matched intake to 75MM tb
    76MM MAF
    42 pound injectors
    255lph walbro fuel pump
    chip from DD
    gasket set and arp head studs from DD
    3" cai
    front mount intercooler w/2.75" piping
    ported exhaust manifolds
    full 2.5 catless exhaust w/megan racing mufflers
    Sniper wet nitrous system (not sure on what shot yet, or if I'm even going to spray it or not)

    Stock blower for now with 5% pulley and some port work, I don't have the money right now for a better blower, so for now, I'll have to run this blower. I was thinking maybe a 10% jackshaft pulley with my 5% sc pulley? I'd love to hear some opinions from some guys that have the similar set up! any input on what else I should or anything would be great, thanks in advance!
    i suggest a 5% jackshaft pulley, But i wouldnt go no more then 10% od overall, i have been told 10 is to much for some cars, but you have that fmic, so i think a 5% jackshaft pulley would be perfect instead of the 10.

  4. #4
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    Apr 2012
    Location
    Michie, TN
    Posts
    133
    Ok, so no real benefit from more than 10% on a stock blower. That's good to know, I'll try that and see how it works. Would you have an estimation on hp and torque with what I have? I'm really excited to get it going again

  5. #5
    Join Date
    Mar 2010
    Location
    Grafton, OHIO
    Posts
    618
    If cash is tight, a late model blower is a nice upgrade for early cars if you watch for a good deal. Couple hundered at most, and a double intercooler (with a fan) also helps greatly with heat, which may alow you to step to 10% from 5, or even 15 (with the late model) from 10.

    Adam

  6. #6
    Join Date
    Mar 2006
    Location
    San Jose, Ca
    Posts
    1,806
    He won't need a double IC cause he has a FMIC

    Late model blower isn't a bad idea though...10% with a late model is better

  7. #7
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    Mar 2010
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    Grafton, OHIO
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    [QUOTE=91BLOWNBIRD;1019487]He won't need a double IC cause he has a FMIC

    DOH!!!! Missed that. With a good fmic 15% on the late model blower would work, especially if used with a MP inlet

    Adam

  8. #8
    Join Date
    Jun 2002
    Location
    Orem, UT
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    I'd leave the stock blower at 5% its currently at, and save up for a late model. Then add the 10% jackshaft to the 5% pulley you have tranfer over to late model, and port the late model. Of course it'd make more power on an MP inlet but those are hard to find and from what I hear may not be made anymore after this last group buy.
    Scott Long
    1992 SC 5-speed
    Black on black leather, lowered, 18x9 Chrome Saleens...

  9. #9
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    Apr 2012
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    Michie, TN
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    Yea, I know about the late model blowers, but all the ones I've seen are going for like $400, and for that amount of cash, I just see save up for a whipple So I think I'm gonna do what you guys are saying and run the 5% for now until I save up the cash an upgraded one....of course, then I'm sure ill have to upgrade my MAF, tb, fuel injectors, and tune again...so it'll be a while before I can upgrade further!

  10. #10
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    Mar 2006
    Location
    San Jose, Ca
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    Quote Originally Posted by smith181992 View Post
    Yea, I know about the late model blowers, but all the ones I've seen are going for like $400, and for that amount of cash, I just see save up for a whipple
    Lol that's funny

  11. #11
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    Jun 2002
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    Orem, UT
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    $400 vs $2200+ mounting, fuel rail, injectors, maf, tb, fmic, tune...

    I'd say the late model is great bang for the buck.
    Scott Long
    1992 SC 5-speed
    Black on black leather, lowered, 18x9 Chrome Saleens...

  12. #12
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    Apr 2012
    Location
    Michie, TN
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    Well...if your gonna upgrade, why not go big, right? Are you saying that a late model blower can give me just as much performance as a whipple? Cause I wouldn't think so.

  13. #13
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    Orem, UT
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    Well no, it will not, however you can bolt it on for a minimal investment. All you'd need is the late model blower and inlet plenum, some slightly larger injectors like 36's or 42's, and a maf w/ the right sampling tube and/or preferably a tune.

    Or you could get a whipple for $2000+, have to fab up a support bracket to mount it, custom fuel rails and lines, huge injectors, throttle body, maf, intercooler, tune, no sense putting it on a stock motor so at a minimum i'd recommend cam and ported big valve heads and roller rockers, then you'd need headers and exhaust system to let it breathe. So after dumping $5000-6000 you can have that, or you could spend like $600 and get the late model and be driving it with more horsepower and enjoy it sooner.

    So for 1/10th the cost you can have more fun with that car sooner.

    It's all about priorities though.

    You can then get the late model ported, and build a front mount kit, get the exhaust upgraded and then later on do a whipple (if you can even find one).

    You don't just swap an m90 for a whipple and get 500 hp. Not that simple
    Scott Long
    1992 SC 5-speed
    Black on black leather, lowered, 18x9 Chrome Saleens...

  14. #14
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    Apr 2012
    Location
    Michie, TN
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    I definitely see where your coming from. I know you don't just bolt it on that easy, I've built my car from the ground up, so I'm not stupid. I know I'll have to fabricate a lot of stuff and have already planned to send one of my extra set of heads to DD and let him do his magic with them and send me a bigger cam etc, etc...of course, I'm sure by the time I do have the money to spend for one...I won't be able to find one, lol

  15. #15
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    Rebuilt and ported late model just sold on e-bay for $310 shipped. If you r not doing injectors, its a 1/2 hr swap. Then you can drive it till you get all your pcs for the whipple, sell it and just about break even. For me, I'm cheep (used to call it thrifty, and it was a good thing when I was in boy scouts), it's a no brainer.

    Adam

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