Turbo Guy's! I Need Your Help!!!!!!!
 

Here is the deal. At 12lbs of boost,everything is good. At 15/16lbs of boost it start's to push water.My question is this.I have no cutout's and running through a magnaflow catback without cat's. Without cutout's can I be producing enough back pressure to help with the lifting of the head's. I read about alot of people and there setup's and most do not seem to be having head lifting issue's until a little more boost is achieved?Or are the dart head's just not up to the task! Thank's guy's.

Anybody?

Yes through the catback you can produce enough back pressure to push water. Also since you have an iron block you are suppost to ad 10 foot pounds to each head stud which could be the problem. Not sure if rob put then on or not or another local shop. Also what type of venting system do you have on the car???? A great way to vent is to run a line from the valley cover down to the intake sides of the turbos and let it suck air out.

My venting system is vented to atmosphere.If you put a hose to the intake of the turbo's, then you risk sucking in oil residue. Rob assembled the motor,but not sure what the torque is on the head's. I am thinking that the single pipe back to the muffler is causing alot of back pressure with that much boost.Anybody else?

What is the hot side of the turbos?? Are they p-trim and what housing and A/R's are you using. I have seen this problem quite a bit with full effort engines running to small of turbos. They cause lots of backpressure and cause the heads to lift and power falls off very early.

Yes I think they are the p-trim with the .89 a/r housing's.
Turbonetic's said they are good for 650hp each. I am not quite there yet.

Yes I meant put a catch can in between the valley cover to the turbo so that way no oil. Venting to atmosphere will not get it done through that catback. I had the same prblem with mine and used a elctric cut out when I raced and shut it all other times. If Rob put the heads on then he is awre of the torq specs. There are boost operated cutouts but when I went to order them they were on back order here is the site for them

http://www.atpturbo.com/Merchant2/me...egory_Code=BCS

They will either be .69 or .85 if on-center. No .89's available. Are they on-center housings?? Also 650 rating is the comp side. The turbine side if not correct won't allow the compressor to make its power. Many overlook the turbine side...

It has a standard housing.Not sure if standard is on center or not.The turbo's look just like the one's in the pic's on the turbonetic's website for the t60-1. Hope this helps.

Maybe switch over the exhaust a see. Myabe go to a true dual set up, run the downpipes into a X, threw mufflers then out the back. Should be less restrictive than the catback and wont have to hassle with a cutout. Just a thought....

IMO you are running a lot of cubes for a dual 60mm kit. 67's would seem ideal with your displacement.

Marty

They are 60-1. They are supposed to be good for 650hp each.Not sure how different they are from the 60's though.

What is your exhaust setup?

But it seems like your problems are upstream, no? Like you have backpressure at the turbos... Or you are hitting it with too much timing and the gaskets can't take the cylinder pressure?

They may be good to 650 on a smaller motor with a higher PR. I don't know if you happen to have a compressor map to look at? They could be a little undersized on a motor your size with much more exhaust flow and getting choked by the turbine trying to move all that air. That would create quite a bit of backpressure and push water.

What size downpipes/exhaust setup are you running?

The comp side is fine. The turbine side seems to be a little small. Like I said before. You could have twin 88's on the compressor side, but if the turbine side is to small, it will not make any power.

My downpipe's are 3in. and run into a 3in. y pipe and into a magnaflow catback wich is not quite 3 in.

How much water are you pushing?

Well the first time it didi it it was about a gallon. But then we realized that I added about a gallon and maybe overfilled it.Then the other day it pushed about a half a gallon.It dosn't do it on the street,but i only run 12lbs on the street and not 15.It never did either on the dyno until i installed the 6 speed. I guess it has more load with the 6 speed.

Get a cutout right at the y. It will cure a lot of issues.

Marty

Are you 100% sure there is no detonation occurring? Detonation = huge spike in cyl pressure, even light detonation that you couldn't hear will cause big spikes in pressure.