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Thread: 75mm MAF and 30lb injectors installed

  1. #1
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    Default 75mm MAF and 30lb injectors installed

    thumper392 on www.performance-shop.com did the install for me.
    he drives a novi2000 blown 392ci convertable.





    I didn' know if he wanted his face on teh intranet.





    My weird strut brace with included camber plates. We realigned the camber by refering to the original plate marks when wwe reinstalled the brace.



    It idled perfectly right away.


    One issue that maybe someone can help me with.
    I took if for a spin after the install and after a short burst of throttle I came to a stop and found a fluid causing smoke on the driver side header. There's quite a bit of fluid. I don't think it's the head gasket because I still have full power, and the fluid seems to spray out only at WOT. I think it might be oil, the smoke is white. I just had an oil change earlier but this was not happening.
    I can't see where it's coming from.
    edit: I'm pretty sure it's oil now.
    Current Cars:
    1970 Chevy Blazer, 2wd
    1972 Chevy Super Cheyenne C10 Pickup 402 big block, 700R4
    2003 BMW X5 4.6IS Doushmobile
    2004 GMC 2500HD 8.1L Snow plow, dog hauler

    Past Cars:
    2015 Ford Fiesta ST | Cobb Stage 1, catless downpipe
    2008 Corvette Z06 - 11.39 at 123.8mph
    2002 Corvette Z06 - 12.10 at 116.5mph
    2005 Jeep Wrangler LJ
    1993 5L Mustang - 12.59 at 108
    1989 5L Mustang
    1990 Jeep Cherokee
    1991 Acura Integra RS 403Honda

  2. #2
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    i have no clue about mustang engines and where everything is located so i cant help you there, but you should talk to the guy who did the install....isn't burning oil usually a bluish color? or is it not burning?
    Built not Bought.
    Originally posted by mitsumirage
    the civic will always be just a basic car , poor people will always buy them , its sad but its true

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    You'd smell it I think if it was oil..sounds like more like coolant, does it smell "sweet" or like one one of those worn out oil burning checker taxi cabs?...
    Are you sure you have enough injector for the supercharger and the MAf?.. you have 8 30 lbs right.. thats 240 lb/s of injector total..
    I am running 430 lb's of worth injector right now, and sometime I see some pretty high duty cycles...
    I ran some of the injector calcs, and 30 lbs injectors in your application are tapped out around 325-350 flywheel hp which is where an s/c 302 should be around..
    Is one of your heads lifting? Are you detonating.. Oil should leave a carbon build up on the header where its burning..maxt
    1987 T62R 20b FC Quaife seq 6sp Motec m800
    1988 20B Peripheral port FC3S
    1994 T51r Kai BB Peripheral port FD

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    Originally posted by Maxt

    I ran some of the injector calcs, and 30 lbs injectors in your application are tapped out around 325-350 flywheel hp
    He's running an fmu. 320cc injectors should be good for more power than that

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    Depends on the static fuel pressure, and then the capabilties of his fuel pump at and above those pressures, fuel pump delivery falls as pressure is increased, thus the FMU patch for the small injectors, maybe making his fuel pump max out as well...
    I ran it through a couple of the calculators, and thats all it came out to...
    If the FMU is 1:1 though, the differential pressure remains the same, so even though the fuel pressure is going up the flow rate of the injector at a given duty cycle will remain the same, since the manifold pressure is increasing as well..
    For instance:
    Manifold pressure fuel psi Differential
    0 psi 43.5 43.5
    1 44.5 43.5
    2 45.5 43.5
    etc etc
    at .6 bsfc(supercharged). The peak rating for those injectors is 38.7 hp/injector at 80% duty cycle which equates to 309.6 hp in an 8 cyl app..
    Now what about the fuel pump, stock mustang or is it a walbro and which one?
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    1987 T62R 20b FC Quaife seq 6sp Motec m800
    1988 20B Peripheral port FC3S
    1994 T51r Kai BB Peripheral port FD

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    Thanks for the input ppl.

    I discovered that the ppl who did my oil yesterday put too much in. The oil was coming out of the top of the dipstick and the wind was throwing it around. I drained a ~.75L and it's not happening anymore.

    I'm losing the FMU soon and will be using a TwEECER ECU programmer.
    Current Cars:
    1970 Chevy Blazer, 2wd
    1972 Chevy Super Cheyenne C10 Pickup 402 big block, 700R4
    2003 BMW X5 4.6IS Doushmobile
    2004 GMC 2500HD 8.1L Snow plow, dog hauler

    Past Cars:
    2015 Ford Fiesta ST | Cobb Stage 1, catless downpipe
    2008 Corvette Z06 - 11.39 at 123.8mph
    2002 Corvette Z06 - 12.10 at 116.5mph
    2005 Jeep Wrangler LJ
    1993 5L Mustang - 12.59 at 108
    1989 5L Mustang
    1990 Jeep Cherokee
    1991 Acura Integra RS 403Honda

  7. #7
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    I'm using a 190lph fuel pump
    Current Cars:
    1970 Chevy Blazer, 2wd
    1972 Chevy Super Cheyenne C10 Pickup 402 big block, 700R4
    2003 BMW X5 4.6IS Doushmobile
    2004 GMC 2500HD 8.1L Snow plow, dog hauler

    Past Cars:
    2015 Ford Fiesta ST | Cobb Stage 1, catless downpipe
    2008 Corvette Z06 - 11.39 at 123.8mph
    2002 Corvette Z06 - 12.10 at 116.5mph
    2005 Jeep Wrangler LJ
    1993 5L Mustang - 12.59 at 108
    1989 5L Mustang
    1990 Jeep Cherokee
    1991 Acura Integra RS 403Honda

  8. #8
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    Im looking at getting the exact same pro M for my Bird. What do you think of it? Quality and fit?
    Originally posted by Ridelikeme

    preludes are definately not slow.. they are the corvettes of the honda 4cylinder world..they float

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    Good plan on getting the ecu change.. the n/a maps can be added to , to get the enough fuel, but you can never get the curve right for the boost, also having timing control does wonders for tuning...
    .75 of a litre on a v-8 is nothing by the way, we took 4-5 litres of extra oil out of rotary once, it still ran, but smoked alot till we got it down to about 2 litres above full( the moral here is always change your own oil), on big block dodges, its not uncommon to run an extra 2 quarts above full in HP applications with rear sump pan....... It may be time to have a leak down test done on your motor, that sounds like non functioning pcv system/cylinder blow by problems than excessive oil, you may have stopped it from coming out the stick, but the problem may be still be there..Maxt
    Last edited by Maxt; 07-27-2003 at 03:26 PM.
    1987 T62R 20b FC Quaife seq 6sp Motec m800
    1988 20B Peripheral port FC3S
    1994 T51r Kai BB Peripheral port FD

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    The quality is said to beat OEM.

    It seems fine. The mustang shop sold it for $290 which is pretty good.
    The C&L are cheaper but I've heard that they cause problems.
    Current Cars:
    1970 Chevy Blazer, 2wd
    1972 Chevy Super Cheyenne C10 Pickup 402 big block, 700R4
    2003 BMW X5 4.6IS Doushmobile
    2004 GMC 2500HD 8.1L Snow plow, dog hauler

    Past Cars:
    2015 Ford Fiesta ST | Cobb Stage 1, catless downpipe
    2008 Corvette Z06 - 11.39 at 123.8mph
    2002 Corvette Z06 - 12.10 at 116.5mph
    2005 Jeep Wrangler LJ
    1993 5L Mustang - 12.59 at 108
    1989 5L Mustang
    1990 Jeep Cherokee
    1991 Acura Integra RS 403Honda

  11. #11
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    Originally posted by Maxt
    Good plan on getting the ecu change.. the n/a maps can be added to , to get the enough fuel, but you can never get the curve right for the boost, also having timing control does wonders for tuning..Maxt
    The guy whos doing the dyno tuning said that he's never gained less then 25whp on a blown car using TwEECcer, so it'll be worth it plus I might get a little better mpg.

    I've been told that a bigger TB and intake, even a GT40, will free up a ton of flow.

    Right not I'm thinking of picking up a used 3 core rad because I don't like running between 200-220.
    Current Cars:
    1970 Chevy Blazer, 2wd
    1972 Chevy Super Cheyenne C10 Pickup 402 big block, 700R4
    2003 BMW X5 4.6IS Doushmobile
    2004 GMC 2500HD 8.1L Snow plow, dog hauler

    Past Cars:
    2015 Ford Fiesta ST | Cobb Stage 1, catless downpipe
    2008 Corvette Z06 - 11.39 at 123.8mph
    2002 Corvette Z06 - 12.10 at 116.5mph
    2005 Jeep Wrangler LJ
    1993 5L Mustang - 12.59 at 108
    1989 5L Mustang
    1990 Jeep Cherokee
    1991 Acura Integra RS 403Honda

  12. #12
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    I agree with max, 30/lb is small, the 50's would only have been around $10 more per injector, just as an FYI, I use the 72lb injectors for a 4cyl, and use a 80mm maf on my car.

  13. #13
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    and you also trap 10mph faster then me.

    This car (the owner did my injector install) can push 15lbs of boost and lay down ~550rwhp.
    http://streetchallenge.com/uploadpix/up/MD10.JPG

    here's the specs:
    http://streetchallenge.com/uploadpix/up/MD25.JPG

    he uses 50lb injectors in an untuned state.

    I'm not boosting past 7psi so I should be fine.
    Current Cars:
    1970 Chevy Blazer, 2wd
    1972 Chevy Super Cheyenne C10 Pickup 402 big block, 700R4
    2003 BMW X5 4.6IS Doushmobile
    2004 GMC 2500HD 8.1L Snow plow, dog hauler

    Past Cars:
    2015 Ford Fiesta ST | Cobb Stage 1, catless downpipe
    2008 Corvette Z06 - 11.39 at 123.8mph
    2002 Corvette Z06 - 12.10 at 116.5mph
    2005 Jeep Wrangler LJ
    1993 5L Mustang - 12.59 at 108
    1989 5L Mustang
    1990 Jeep Cherokee
    1991 Acura Integra RS 403Honda

  14. #14
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    is that mustang a convertible?

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    the blue one is.
    Current Cars:
    1970 Chevy Blazer, 2wd
    1972 Chevy Super Cheyenne C10 Pickup 402 big block, 700R4
    2003 BMW X5 4.6IS Doushmobile
    2004 GMC 2500HD 8.1L Snow plow, dog hauler

    Past Cars:
    2015 Ford Fiesta ST | Cobb Stage 1, catless downpipe
    2008 Corvette Z06 - 11.39 at 123.8mph
    2002 Corvette Z06 - 12.10 at 116.5mph
    2005 Jeep Wrangler LJ
    1993 5L Mustang - 12.59 at 108
    1989 5L Mustang
    1990 Jeep Cherokee
    1991 Acura Integra RS 403Honda

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    kool. i think i have see it in the royal oak area.

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    30lbers are fine without the FMU. I've used them MANY times on combo's like ekliptix', and far beyond. My own car has 30's, and im at 340rwhp on toma's dyno.
    The stock fuel pressure regulator will increase fuel pressure at a 1:1 ratio in relation to boost.
    50lb injectors are WAY more money than the 30's, and way too much injector for the proposed combo.
    Last edited by THREE40SEVEN; 07-29-2003 at 10:36 AM.
    Ford tuning guy...

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  18. #18
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    I've got to get some injectors and the fuel pump for the Bird if I boost the thing up.
    Thinking of a 255 LPH and a set of 6; 30 or 38lb/hr injectors.
    Originally posted by Ridelikeme

    preludes are definately not slow.. they are the corvettes of the honda 4cylinder world..they float

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    Originally posted by THREE40SEVEN
    30lbers are fine without the FMU. I've used them MANY times on combo's like ekliptix', and far beyond. My own car has 30's, and im at 340rwhp on toma's dyno.
    The stock fuel pressure regulator will increase fuel pressure at a 1:1 ratio in relation to boost.
    50lb injectors are WAY more money than the 30's, and way too much injector for the proposed combo.
    Do you know what your injector pulse width was at when you did the run.. I would bet your injectors are at 100% duty cycle or very close to...
    I ran your setup through every calculator I have, and I come up with a a flywheel horspower rating of around 365 at 95% duty cycle, so I would say you are on the ragged edge of your fuel system, or Toma's dyno is out to lunch and your car has only 7% drivetrain losses, the math doesn't lie, you can only make so much HP out of so much fuel...
    It sounds to me like Ekliptix may have a broken top ring on one or two cylinders, thats why he's pushing oil...Detonation perhaps?
    I am currently running 430 lbs/hr of fuel injector, and I see duty cycles as high as 75% so far under boost at 11:1...

    If you are after cheap big injectors, the RX-7 non turbo injectors are about 45 lbs/hr, and can be found on 86-88 rx-7's(low impedence)..
    Also on the stock fuel pressure regulator, assuming a static pressure setting of 43 psi , with a 1:1 ratio , at 15 psi of boost, the injector flow rate stays the same as it was off boost, as the differential stays the same. Even with a 2:1 ratio, and raising the Fuel pressure to 78 psi, your flow rate of you injector only increases to 38 lb/s hr, and thats if your fuel pump is happy with those flow rates at 78 psi, which its probably not..
    I am not trying to pick on you guys, just trying to tell you that you might be shopping for pistons soon..Maxt
    1987 T62R 20b FC Quaife seq 6sp Motec m800
    1988 20B Peripheral port FC3S
    1994 T51r Kai BB Peripheral port FD

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    I actually think it was a out of place PCV valve.
    Current Cars:
    1970 Chevy Blazer, 2wd
    1972 Chevy Super Cheyenne C10 Pickup 402 big block, 700R4
    2003 BMW X5 4.6IS Doushmobile
    2004 GMC 2500HD 8.1L Snow plow, dog hauler

    Past Cars:
    2015 Ford Fiesta ST | Cobb Stage 1, catless downpipe
    2008 Corvette Z06 - 11.39 at 123.8mph
    2002 Corvette Z06 - 12.10 at 116.5mph
    2005 Jeep Wrangler LJ
    1993 5L Mustang - 12.59 at 108
    1989 5L Mustang
    1990 Jeep Cherokee
    1991 Acura Integra RS 403Honda

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