!!!!!LESS BOOST!!!!!

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74RogersBubbledeck

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« on: October 26, 2012, 08:29:44 AM »
Sometimes less is more.

Woke up at 4:30am Saturday and headed for the river to try out the 13psi pulley. Got on the river about 11 and I didn't like the way it was running. Didn't sound right and didn't feel right. Jesse was right in that I would probably need a surge valve with this much boost. Several other thoughts came to mind as I experimented. I put the 9psi pulley back on and started the tuning process again. This is all trial and error to find what we're looking for here. I believe I am at the best place I can be with my current set up. I run quick and hard to a max speed of 86mph in about 6 seconds. My pump is pushing as much water as it can. My intake is stock and yes my next step will be to change this. Need Cash  :screwy:

My engine is set up strong, but with the iron square ports heads (mildly ported and polished) I think they are only going to flow so much. AFR heads are on my wish list, but again it's about the cash flow.

I'm bummed I didn't take the time to stop and meet you guys at Buckskin for the 21' boat race, but at the time I was tired and in a place to get my Rogers running right.

Lots of time this off season to do stuff, hopefully business will pick up and the cash flow will allow some big changes sooner than later.



UltraRed

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« Reply #1 on: October 26, 2012, 11:52:10 AM »
  8) as hell. Maybe one day i will be able to go fast...
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propless

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« Reply #2 on: October 26, 2012, 12:05:18 PM »
 Interesting.   When you say it didnt sound right or run right,  what was it doing ?   
Welcome to the club of broken boats :o  Pay here$ bend over and move along.

JetBoatJesse

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« Reply #3 on: October 26, 2012, 12:24:04 PM »
Well I still have that valve you can try out, just don't give up on it. But 86 isn't bad at all.

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ka0tyk

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« Reply #4 on: October 26, 2012, 01:28:13 PM »
LOTS MORE BOOST!


74RogersBubbledeck

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« Reply #5 on: October 27, 2012, 08:10:49 AM »
Interesting.   When you say it didnt sound right or run right,  what was it doing ?   

The sound that was different was more than the ear numbing exhaust. It was like I could here the blow back of the pump. It was quite different than what I'm used too. I'm very in tune with my ears to catch trouble before it's too destructive. Maybe I over reacted on the safe side.

The way it ran was much less giddy up and max speed of 72mph on my gps.

My jetting should have been close enough based on my conversations with the Procharger tech I had before I attempted this. I haven't called them back yet to get their opinion.

I felt maybe my system won't allow this much air flow. Am I wrong? It would be great if I was, that way I could get more out this as it sits.

I would like to try again. If it's warm Thankgiving weekend I'll take it to the river with me. If it's cold I'll play golf and hang out watching the water go by  8) :beer: :beer: :beer:

propless

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« Reply #6 on: October 27, 2012, 01:11:35 PM »
The sound that was different was more than the ear numbing exhaust. It was like I could here the blow back of the pump. It was quite different than what I'm used too. I'm very in tune with my ears to catch trouble before it's too destructive. Maybe I over reacted on the safe side.

The way it ran was much less giddy up and max speed of 72mph on my gps.

My jetting should have been close enough based on my conversations with the Procharger tech I had before I attempted this. I haven't called them back yet to get their opinion.

I felt maybe my system won't allow this much air flow. Am I wrong? It would be great if I was, that way I could get more out this as it sits.

I would like to try again. If it's warm Thankgiving weekend I'll take it to the river with me. If it's cold I'll play golf and hang out watching the water go by  8) :beer: :beer: :beer:

 WOW, with a speed drop from 86 down to 72 it was definitely not happy.  You made a good choice to go back to the old set up till you can figure out what the problem might have been.   I'm sure you'll figure it out.  Soon you'll be teaching us all how to deal with these these things.  ;)
Welcome to the club of broken boats :o  Pay here$ bend over and move along.

74RogersBubbledeck

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« Reply #7 on: October 27, 2012, 01:27:11 PM »
Hey Jesse, Have you run into this type of issue when bumping up the boost in any of your cars?

JetBoatJesse

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« Reply #8 on: October 27, 2012, 09:33:04 PM »
LOTS MORE BOOST!


yea that's about right:D

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JetBoatJesse

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« Reply #9 on: October 27, 2012, 09:53:13 PM »
We have.  When we go from a SI to a YSI and the bov is too small they need a lot more tunnig because they don't blow off the extra air its not using, but I would think that a 9 psi pulley to a 11 psi pulley change at lower speed u have to think its making the same air at lets say 3500- (old pulley) now at 2700-3300 RPM. And the IAT will go up, drop me a p.m you can take this bov I have to use.  If it works good, bring some cold ones my way, I sold all the stuff I had it the last thing I had so.I really don't need it. The people I have talked too say 9-11-18-26 psi under no boost and under high vacuum they should a do run like they don't have a blower. So if it ran and sounded funny even at low speeds maybe it was stacking up air at the blades or something, they might run the impeller to valuate clearance loose to pass air by it at low boost. Not sure but don't give up. Still never seen a setup without one.:-X
 
 

 
 

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JetBoatJesse

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« Reply #10 on: October 27, 2012, 10:01:06 PM »
And people are messing around with waste gates to ramp the boost up. Run a small pulley spin the crap out of a blower then bleed it off at the boost level they want. Ill get a video of the boss"s car we just finished Friday,  when we dyno it Tuesday,  it should make 675-700 at the tire. 750-800 at the motor. Last week we finished one that made 800+ .

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JetBoatJesse

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« Reply #11 on: October 27, 2012, 10:16:56 PM »
That's our system installed on a LS7.  Yeeha

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