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  1. GN7 On the Dyno
    the carb is a Holley 4150 So new to me boat, I've had it out a couple times at the local lakes. The previous owner mentioned he recently went up in size and was thinking it might have been too much. Any seat of the pants tests I can run to figure out if its should be rolled back to the old...
  2. GN7 On the Dyno
    I have a 496 BBC with a Holley HP 950, single plane intake, Dart Pro 1 335 aluminum heads, 10.5:1, nitrous/blower solid roller cam... 114LSA... 110CL...255/262 duration @ .050"... .652 intake/exhaust, MSD 85551 dizzy, MSD 6ALN and a Blaster 2 coil. I'm looking for some base points to start...
  3. Propellers
    I have a GN style boat with a left hand 2 blade prop that needs some attention. Where are you guy sending yours, Menkins, Hill?? Thanks
  4. Parts for Sale
    The AFX system uses the ntk o2 sensor. I only used it one time . Now using 02 monitoring in the efi comp.- $195 with sensor New edelbrock fuel pump- pt number 1722- $100 Nice polished driveline cover for jet boat- $85 in shreveport, louisiana 318-687-9088 318-470-1482
  5. GN7 On the Dyno
    Pretty nice/cheap kit, and alternative to the LM2 . FiTech Go Tune AFR Basic and Power Adder Systems | FITech Fuel Injection
  6. Jet Boats
    Posted this in the V-drive forum as well, lots of jet boats with wet stacks, so hopefully my issue has already been resolved by someone: Has anybody successfully done a temporary installation of a wide band O2 sensor and AFR gauge to dial in a carb? I'm able to set up the sensors no sweat, my...
  7. V-Drives
    Has anybody successfully done a temporary installation of a wide band O2 sensor and AFR gauge to dial in a carb? I'm able to set up the sensors no sweat, my concern is how to keep it dry since I have wet stacks. My thought is to setup a temporary inline tube where the rubber hose interconnects...
  8. GN7 On the Dyno
    Does anyone on here tune or know a good tuner for MEFI 1 ECU? I had Arizona Speed and Marine throw a "best guess" tune on it by sending the ECU to them through the mail but it's still off from what I know the motor can do. There is a flat spot in acceleration at about 3/4 throttle where it...
  9. GN7 On the Dyno
    I am looking for marine shops that also do Dyno Tuning. I need a shop that I can just drop the boat off and they can pull the engine dyno it and then put it back into the boat. I know Boost Power has a dyno and I haven't crossed them off the list but they are a little far from me. I am looking...
  10. GN7 On the Dyno
    When jetting and such do you go fatter on pump gas , or fatter on race gas? I know race gas has a slower burn rate
  11. GN7 On the Dyno
    I have a relatively stock 302 out of a 1990 GT mustang installed in my 65 falcon. The stock heads have a little port work, with 1.7 roller rockers and a free flowing exhaust. Other than that it's pretty stock. I'm running a T5 5spd and an 8.8 rear end w/ 373. I recently installed a Ultra...
  12. Parts for Sale
    I bought this brand new from summit and then i decided to run an efi system so this is for sale. I never used it . I paid $479 and will take $350 for it. shreveport, louisiana 318-687-9088 or 318-470-1482
  13. GN7 On the Dyno
    I installed a Innovate wideband O2 gauge and it did not come with any "tuning" suggestions. I Got some good info from my old thread "Teague 509 blower motor jetting. Where to start suggestions? I'm real lean"...
  14. GN7 On the Dyno
    Me n uncle went out after work to tune our deals to run alil cleaner.last time out my turbo 5.3 was alil fat on secondaries and high boost so i wanted to clean it up, jetted down couple sizes made a nice hard pass watchn afr. and i had taking away alil too much and was seeing 11.7-11.8 at 19lbs...
  15. GN7 On the Dyno
    Hi there guys I am writing this because I am at a loss. I would like to preface this by saying I am NOT a mechanic but do have some average knowledge of how a motor works and the mechanics involved. My father in law helped me build this and he was an old gear head from way back, but he has...
  16. Jet Boats
    well played hooky from work with chuck787 and we both went out to tweak on hardware and tune a bit :))THumbsUp heres some vids of chucks miller.gettting pretty close to being dialed in for his son charles to run the njba soon Chuck787 - YouTube Chuck787 - YouTube Chuck787 - YouTube
  17. GN7 On the Dyno
    anyone using water/meth injection with a boosted engine, what a/f ratio to shoot for when in use. i am at 11.5-1 off the injection, when it comes on it goes to 10.0-1 seems too rich, turning up the boost a few lbs seems to do little to the rich condition, motor is pump gas small block chevy...
  18. GN7 On the Dyno
    Ok boys I have a 477 BBC with cast iron rectangle port hi-performance gm heads. Pretty mild motor 4" stroke, 6.135 rods with flat top forged pistons. The compression ratio comes up to about 8.25:1 on the engine. The cam is a crane 168731. So it has a b&m 250 blower and super chiller intercooler...
  19. Jet Boats
    I have a GPS gauge for top speed but how can I measure acceleration? Is there a device I could buy (within reason) to help?
1-20 of 40 Results