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Power falls off bad around 720 HP

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Old Oct 4, 2011 | 02:05 PM
  #16  
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From: WAR EAGLE!
Josh,
How long have the valvesprings been in the car? Could they be losing spring rate overtime?

Are you running Kiggly's?
Old Oct 4, 2011 | 02:16 PM
  #17  
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Originally Posted by TwStDeVo
honestly man, i think its the twinscroll set up. all the cars with singlescroll kits made crazy power and held all the way. id be willing to bet that if you swapped to singlescroll it would solve your issue.
i was going to say, that turbine housing sounds kinda small. maybe the 1.15 would be a better choice.
Old Oct 4, 2011 | 02:41 PM
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Originally Posted by R/TErnie
Josh,
How long have the valvesprings been in the car? Could they be losing spring rate overtime?

Are you running Kiggly's?
Ever since I got the head. That's what we first thought maybe we are getting some kind of weird spring issue or maybe valve float. Maybe mike at AWD can chime in if he sees this and could answer it. I'm no mechanic.

It has the standard springs that come with the BR Stage III head. So whatever come with them is what I've had on there for a while. I got the head in Feb 2009.

What I can tell you is that my sweet driving skills has made the car rap put and bounce off the rev limiter a few times so maybe it damaged them then. Again this is due to my awesome (see crappy) driving skills.
Old Oct 4, 2011 | 02:54 PM
  #19  
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Originally Posted by n2oiroc
i was going to say, that turbine housing sounds kinda small. maybe the 1.15 would be a better choice.
Have you ever seen the 1.15>>> LOL it's huge and won't fit. I know because when I ordered the 3794 HTA I got it with the 1.15. Since my manifold was made to fit the 4088 from ETS there is no room for that housing. The 1.00 is big also and it took around a full day to get it to work as there were numerous problems due to fitment and how large it was.
I've been told (if you look here #23 https://www.evolutionm.net/forums/ev...o-sheet-2.html) that smaller one would be better.

I am hitting like 6000-62000 full boost so putting the 1.15 would move that to around 9000 rpms...
Old Oct 4, 2011 | 02:54 PM
  #20  
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From: Colorado
Josh, I hope you find the solution. I'd start with the larger housing.

Meanwhile, that's not a bad problem to have -- power falling off at 720 HP
Old Oct 4, 2011 | 02:56 PM
  #21  
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Originally Posted by CO_VR4
Josh, I hope you find the solution. I'd start with the larger housing.

Meanwhile, that's not a bad problem to have -- power falling off at 720 HP
Ya I know that's what everyone says. Thanks buddy.
Old Oct 4, 2011 | 03:15 PM
  #22  
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Yeah Josh. Why can't you just be happy with 720whp. Really...

I was wondering why your car was there when we were tuning mine on E98.
Old Oct 4, 2011 | 03:15 PM
  #23  
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From: milwaukee, wi
whats the boost doing when the power is dropping?
Old Oct 4, 2011 | 03:22 PM
  #24  
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From: Thornton, CO & Pasadena, MD
Originally Posted by n2oiroc
whats the boost doing when the power is dropping?
If I recall boost stays around 35 and doesn't move. It stays on strong.

I had a similar problem with my 4088 and changed the housing to a larger one. Added more fuel. Did this, did that. Cost me a ton of money and ya know what it was..old turbo technology and I maxed the 4088 out at 674 HP. As soon as we bolted the 3794HTA on it shot straight up (HP wise that is) to where we are at now on the first pull.
Old Oct 4, 2011 | 03:23 PM
  #25  
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From: Thornton, CO & Pasadena, MD
Originally Posted by rodent
Yeah Josh. Why can't you just be happy with 720whp. Really...

I was wondering why your car was there when we were tuning mine on E98.
I suppose it's cause I 'm retarded and want to reach the full potential of everything.
Old Oct 4, 2011 | 04:06 PM
  #26  
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From: WAR EAGLE!
I'd throw a new set of Kiggly's at it for a cheap test.

After that I'd try a BW EFR 9180 with the big T4 TS hsg.
Old Oct 4, 2011 | 04:16 PM
  #27  
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From: COLORADO
Sounds like a possible valve float issue to me.

Aaron
Old Oct 4, 2011 | 04:18 PM
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720whp corrected or uncorrected, Mustang or DJ, and you can see valve float in the dyno sheet in the event you cant hear it. I just recieved a 1.15 this morning and it doesnt look that big

Aaron
Old Oct 4, 2011 | 04:20 PM
  #29  
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Originally Posted by TwStDeVo
honestly man, i think its the twinscroll set up. all the cars with singlescroll kits made crazy power and held all the way. id be willing to bet that if you swapped to singlescroll it would solve your issue.
I have a twin scroll kit and it holds to 9k and wants to keep going. Unfortunately i haven't had a chance to re-tune for more boost and higher rpm's. But i wouldn't say twin scroll kits don't make the power and hold all the way. I am in Colorado as well.

Aaron
Old Oct 4, 2011 | 04:28 PM
  #30  
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From: WAR EAGLE!
Originally Posted by JohnBradley
720whp corrected or uncorrected, Mustang or DJ, and you can see valve float in the dyno sheet in the event you cant hear it. I just recieved a 1.15 this morning and it doesnt look that big

Aaron
I haven't heard Josh's car or seen the dyno sheet So there is hope


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