Josh - Hog out the current housing

 

1.15 a/r twin doesnt look too big to me. We compared it to Jeff's 1.44 which is definitely size huge (like 50% wider, has to have bolt reliefs).

 

Ya the problem with the 1.15 is that it's too close to the turbo housing and the bolts and such were too hard ot get in. I know it's crazy and doesn't seem right. But that's what we tried for hours on end.

I called FP and they said nobody has done the 3794HTA in TS configuration yet and I was the first and they really had no tech support for the issues. They also sent wrong fittings thinking they would fit. This was such a pain in the *** to get to work.

 

I will go with R/T Ernie. I had a similar issue with my car falling on it's face after 7000rpms. I'm not talking about the powerband nosing over, I'm talking about the curve falling off of a cliff. It was audible through the exhaust note on the dyno. After troubleshooting a few things I found it to be valve float. I switched to GSC Beehives (had BC springs) and this eliminated it.

I'm pretty sure Buschur heads come with Supertech Duals standard which should be plenty of spring, unless they are just worn out due to fatigue.

 

sounds like a valve float issue, have you tried to dyno on less boost to see if the power drops off yet. but if you want help from the pros you should really post a dyno graph it will keep everyone from guessing. and you will find your answer quick.

 

It defenatly not the cams ive seen kelford 272 make 814 awhp with supporting mods of course

 

I have used: Crowers, HKS, Manley, Kiggly's, Supertech, Ferrea and I am sure others I can't recall. Supertech duals have changed rates, unknown to use multiple times. It has, in the past, left me in some pretty **** poor situations. They offer MULTIPLE sets of dual springs, even today. With all that said, the customer service from them has been exceptional AND we currently use Supertech's.

Without a dyno chart/ignition map it's hard for me to actually help. Valve float is for sure an issue in EVO's and is fixed with a good quality spring. Since that is our head on the car and I believe it's been said it's from 2009, I'd say there is a good chance it's springs, I'd replace them with the new Supertech duals we are using, I believe their current spring is the BEST ON THE MARKET.

I have nothing else to give to this thread.

 

Thanks Dave.

 

English uses kiggly and they run 8s every weekend.

 

<- Has a set of Kiggly Springs in stock& located in Lakewood in case you forgot.

Shawn's Evo had the same problem before we installed our CNC head with Kiggly's & Kelford 280's.

 

Thanks Lucas. I will talk to Tobz to see what he wants to do and I will keep you in mind and the offer you gave me. It would be nice to have them local for a quick turn around.

 

Here is a graph from Shawn's car last year. Only changes we made was our CNC head, kiggly springs, kiggly hla, +1mm ferrea valves, kelford cams, 3" upper I/C & ETS 4" core.



Hope this helps

 

Kiggly did a nice video of his valve springs in action. They are the best out there, IMHO.

 

Only changes? You added lots of power changing parts.

And to be honest as little as josh's car has spent actually running and driving the last few years I highly doubt his springs are already worn out. But if the supertech duels have been redesigned or changed in 2 years already maybe its the cheapest thing to try first.

 

True, I have not driven it much really. Maybe 3000 miles but I doubt that. But I have wrapped it out to the redline so that may damage them and if they are already bad then it would add to the damage that is already there.