MY99TAWS6

iTrader: (3)

You are running hptuners..how did you log misfires..aren't you running speed density 2 or 3 bar? In speed density the misfire testing don't work? To get it to work had to put maf back on and unfail maf then could check misfire. You can also do powerbalance test with hptuners..version 2.22 version 2.23 beta don't work for me.

I had machine gun problems on my 99TT. It was burnt wires. Fixed the wires and car ran great.It was running on less than 8 for sure with the wires cooked up.
Plugs are important.Too cold and you will load up. Iridium can run colder heat ranges and not load up like non iridium. And you do need the gap down enough to not blow out the spark. .028 or so should be sufficient. You can up the dwell with hptuners also ,some guys have gone to the more powerful truck coils.
For sure you need to not lean out too much at higher boost levels. And timing can make a huge difference in power more I think then a half point or so of afr.

I would think your car should be easily putting out 700rwhp even at like 8 or 10psi.
What is the max airflow of your turbos?

And what about exhaust..cutouts? two restrictive exhaust can really hurt too.

HUNTER02SS

iTrader: (24)

Is the motor a newly built motor? If so, the problem you are having sound's similar to my problem I had. Have you confirmed your timing with the motor and the ecu, by using a timing light on the motor , making sure that what timing you are commanding in the ecu is actually what the timing in the motor motor is.

ayousef

I wont loose anything, so I might as well try that, but Im thinking yes its running whatver is being commanded

HUNTER02SS

iTrader: (24)

So did I, and mine was 14deg. off retarded. 10deg. of it was my fault by the wrong value entered in the crank reference table, and after that the motor itself was 4deg. off. needless to say I was 100rwhp off on the dyno until I fixed the timing issue. Now she is a new animal!

mwatson185

What are the specs of your cam? Back pressure and high overlap can really kill power, and make your car build boost the way you described.

qqwqeqwrqwqtq

If I recall correctly its around 226/230 117lsa. The cam selection is not the culprit here, I think there is a mechanical problem for it to be down this much power.

cullen

iTrader: (3)

downpipes are too small

route your wastegates externally

turbonetics turbos are usually a let-down

ForcfedGN

iIs the car auto or sticK? Ive seen torque converters start to balloon and cause this.

ayousef

That would be one of the first things ill do.

stick here.

ayousef

quite right on the cam specs jim.

hellbents10

iTrader: (10)

With the IATs that high and the boost coming on slow I would point to a boost leak. Did you pressure check it yet?

FastKat

iTrader: (10)

Is everything grounded properly - including all the appropriate leads on your engine harness, the fuel pump, and especially the block?

ayousef

Id love to beleive its a boost leak, but I cant get that in my mind because a visual inspection doesnt seem to show any signs of a boost leak, and im assuming for what happened to happen the boost leak should be quite big and obvious.

I will still however check for boost leaks, and well see what turns out.

ayousef

Guys, I mentioned in the initial post that the car was running with no air cleaners, I didnt mention however that the car was not running any inlet pipe on the turbo itself, so this is how the car looked like:

http://www.turbotechnologyinc.com/c6...e_manifold.jpg

http://www.turbotechnologyinc.com/c6...e_manifold.jpg

Is that part of my IAT problem right there, the fact that the turbo inlet surrounding was being heated up by the manifolds as well?

I took the previous pics from turbo technology's website.

crashly

get bigger turbos

or

make the engine cubes smaller

ayousef

possible.


yet second option is too late to do. Now even with the suggested solution, there still is something definitely wrong which I want to figure out at least before I even think of bigger turbos. The next culprilt would be the 2.5inch downpipes on a 427

MIGHTYMOUSE

iTrader: (59)

leakdown test the engine

crashly

i still cannot see where u listed the actual compressor wheel size???
i know there are t3/t4

at a guess u have 57mm comps, and stg3 turbine wheels...which u will probaly never get it any better..

find out what comp wheel size ......

qqwqeqwrqwqtq

It's a TTIX system and is capable of ALOT more power than it's currently producing.

BLOWNBLUEZ06

iTrader: (17)

Doubtful, but one locked up turbo would cause a problem and the other turbo would over spin to compensate. I would expect that to raise your IAT's. The bottom line is we can only provide ideas. You're eventually going to have to get in there and start testing everything. Just passing a visual inspection doesn't cut it. I had a boost leak from a bypass valve stuck slightly open. Make sure your turbos spin freely and there is no shaft play. Then make sure all of the fins are on the turbine and compressor wheels with no signs on engagement with the housings.