Josh,
How long have the valvesprings been in the car? Could they be losing spring rate overtime?

Are you running Kiggly's?

i was going to say, that turbine housing sounds kinda small. maybe the 1.15 would be a better choice.

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.

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...

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.

Yeah Josh. Why can't you just be happy with 720whp. Really... :D

I was wondering why your car was there when we were tuning mine on E98.

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.

I suppose it's cause I 'm retarded and want to reach the full potential of everything.

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.

Sounds like a possible valve float issue to me.

Aaron

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 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

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