question on apba 5psi boost regulator

region6727 · 11-06-2009, 05:16 PM

can somebody explain to me what happens exactly to a hydro motor when the regulator blows off at 5psi? does it mess with the ecu.. turbo.. fuel mapping... ??? does it blow off (while you are hooked up, or not hooked up)??? what kind of damage or extra wear does it do to the motors? im just curious.

97 · 11-06-2009, 07:20 PM

stock is 7# and unplug is 4# i was told. like anything running it unplug is not good.

i have one, notice not much difference but might be me or my set-up is not right

ask momar

riverratdad · 11-07-2009, 09:58 AM

Quote:

Originally Posted by region6727

can somebody explain to me what happens exactly to a hydro motor when the regulator blows off at 5psi? does it mess with the ecu.. turbo.. fuel mapping... ??? does it blow off (while you are hooked up, or not hooked up)??? what kind of damage or extra wear does it do to the motors? im just curious.

It causes all kinds of issues with your fuel mapping which causes fuel blowing by the rings, motor issues, fuel in the oil, your turbo blowing oil into your intercooler fouling sensors, ecu issues and many more problems....plus the $ 10 - $50 valve item does not work sometimes or is not accurate. This is one of the worst rules that the APBA has ever come up with and is one of the reasons that we are out of stock and limited ski racing at APBA events. The S4 was designed to run 7 and 14 lbs of boost for a reason. Also for the 100th time for the record Hydrospace should not even be in stock or limited class at APBA events any more. How many S4 Hydrospace racers do we have in the USA? 10-15 total?....All the Hydros need to be running in Open or GP classes at APBA events....at the World Finals IJSBA events that is a different story....they have different rules and there are 300 + S4's racing at IJSBA events World wide...Dad

momarski · 11-07-2009, 11:35 AM

its also the reason we lost our contingency payments which offset the cost of racing which is the biggest blunders the apba ever did, instead of taking bribe money from the oems and factory pipe he should have suggested that the oems and factory pipe offer contingency money to use there brands or products, this would have helped the sport, it would have not helped his pocket so much but it would have helped the sport

DZRacing1 · 11-07-2009, 02:05 PM

Iam in favor of the HS in Limited and Open classes! However the BS Stock spec rules need to go. And Why do we need a pro stock class?

region6727 · 11-07-2009, 02:49 PM

thanks for the info rrdad, that is the kind of info i was looking for. if you were to run an aftermarket ecu (which is allowed in ijsba ski stock class) can you adjust the ecu to run at lets say 5psi without causing damage to the motor or sensors? do these aftermarket ignitions allow you to run at any boost pressure that you specify ex 5 to20 psi and have a specific fuel/air/timing mapping for each setting? if so i would think that the ecu could solve alot of those problems in stock class for the hydro, but i would be a hard thing to police, especially if you can play with the timing and fuel however you want... just trying to generate some options. the thing that sucks for the hydro guys is that now you are forcing them to spend another $3000 or so to get set up for a limited, but i guess thats what some of these new ecus cost anyways which are allowed in stock.... all you are doing is forcing people to spend more money if they want one of those things i guess it kinda a lose lose situation for stock class. there were 14 individual hydrospace riders that entered in an apba stock class in 2009 (i dont have the limted or open numbers), and according to scott fraiser there are roughly 243 s4's on the water world wide.

region6727 · 11-07-2009, 02:59 PM

dave im not sure what you guys are getting for hp/ mph numbers, but the hydro seems to have almost the same advantage in limited class as it does in stock class over the 2strokes... not to start another $hit storm of a thread like my other one, but i would think that you should be getting close to 150hp out of your hydro limiteds? is that an accurate guess? other than gp were the 2 strokes can switch to larger displacement 2 strokes, when is a 800cc 2 stroke (yamaha or kawi) ever going to make 180-200hp without blowing to a million pieces in open/ss.. if your going to spend the coin on an open boat, usually it isnt a budget build, so a hydro would be the way to go i guess...

momarski · 11-07-2009, 03:20 PM

well as far as the finals go, the pros need as many classes as they can get, so a pro-am stock class is good, when you come from another country you would like to get as many races as you can, and a hydro with a autronics can run all 4 pro classes at the finals with the same boat and actually you can run all four classes without a autronics, thursday and friday just switch from your black to your yellow to run stock and limited then just run your yellow, a pump cone, a different prop and a afternarket intercooler and turn your boost up some and run on the weekend, klipper showed you can be competitive that way, one boat, 4 classes, really saves you money

I spent many a years having to run two boats for two classes, that time is no more

riverratdad · 11-07-2009, 04:10 PM

....running an Autronics, V-Pec or Motec does solve most of the problems when you run 5 lbs of boost....or changing any boost figures....at APBA events...the stock OEM orange inter cooler is XXit at best....especially if you are running more than 7 lbs. of boost.....Dad

Yamahaman3 · 11-07-2009, 05:02 PM

My Open boat has more oil in the gas than my stock / ltd . No issues with sensors any more or less between the two , and I ride the open boat less than the stock / ltd . As long as APBA says I can race in the stock class I will . But I agree it doesnt belong there . Neither do all the mods you can do to the 2 smokes .