Just want to get some opinions on this manifold and see if anybody can spot something out of the ordinary. I just installed a brand new Precision PW46 gate, 9psi spring, take it out for it's first run and I'm seeing around 12-13psi steady untill around 6k when it starts to creep and finally around 7k it just shoot right up to 20+psi.. Tried 3 different wastegates, various springs, running it right off the comrpessor housing to the bottom port etc.. at this point, the only thing I can think of is that there is something wrong or altering exahust flow to the wastegate outlet, which is why I'm posting these shots up. LMK!

 

The wastegate placement is not that bad I think.

 

the wastegate may not be opening, that the top off the wastegate and confirm you have only a 7 psi spring in there. Someone recently was having similar issue witha tial wg that supposed to come with 9 psi spring and when he opening it up there was two springs inside that equaled over 20 psi

 

Its tough with such a short collector.

 

I opened it up, installed the 9psi spring and ran it on that so according to Precision, that's the right spring.

 

Bench test the wastegate.. Supply it with an air source and an inline pressure gauge, and test it for valve movement. You'll be able to discover that it is the wastegate's fault or the manifold.

Don't keep using your engine for testing, because it's not wise to keep hitting that unintented boost.

 

Actually I did, starting opening around 12psi, fully open at about 14psi. Bench tested the TiAL's and they perofrmed accordingly, still has the problem with runaway boost at higher rpm though..

 

where are you hooking the vacuume line for the waste gate?

 

If the wastegate is opening, and is opening fully, then I would look at the boost signal source for the wastegate (kinks, line blockage, etc..) as the next potential problem.

Over retarted ignition timing and rich AFR's can also cause boost creep.. I had cases which boost creep was present (15 PSI creeps to 20+ PSI), but simply dialing up the timing have brought it down to acceptable levels (15 PSI creeps to 17 PSI). The amount of timing you can run will depend on your setup though, so an hour at the dyno can help you further troubleshoot.

 

This is what Im thinking as well thats why I asked. A buddy of mine ran his vacumme source for his waste Gate off his compressor housing for some dumb *** reason and it creeped like a mother fvuker until her ran the line all the way to the intake manifoild and it solved the problem.

 

What size is the turbo?

 

Thanks Tony, I'm going to look into that. I've removed the Ramhorn and am installing an old Revhard log just to see what happens with the swtich, if nothing esle it should confirm if it was a manifold issue in the first place.

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Since I removed the manifold I took some shot of the collector and the wastegate exit. This manifold was sold to me as a 'Full Race' unit, i've never seen another one but maybe somebody can take a look at the pics and tell me if everything looks as expected:

 

not to be a jerk but the manifold doesnt look to be of the best quality. there are cracks, the collector isnt done very well and the w/g opening is severely restricted. fix the issues with the manifold or find a suitable replacement. The short collector and the blocked wg opening is really going to hinder boost control with a manifold that doesnt have a priority design

 

Yeah I would ditch the manifold It has cracks and shitty welds and the exit to the waste gate is a horrible design and it alone could be causing boost creep.

 

did you ever find out the problem

 

no question... its the entrance on that wastegate elbow...

if exhaust gas is equal to an elephants d*** the entrance for exhaust gas to reach the wastegate is an ants p****....

either fix that manifold or get a new one...

 

have a nice day

 

yeah thats the issue. manifold is pretty shitty on the inside.

i was hitting 25psi on a 38mm mvs with a 7psi spring on my ramhorn. i had a 44/46mm flanged put on and it would only go 2-3psi above spring pressure.

check the drag racing forum classifieds, my manifold/downpipe is for sale if youre interested

 

Apprieciate the feeback folks, justed ordered up a new Blueridge Motorsports Ram & DP combo now.. do it right or don't do it at all eh?

Thanks!

 

that manifold will work just fine. anyone who thinks thats bad is either a gifted fabricator with high standards or a rich kid.

im thinking installer error with the WG.

 

A V-band clamp and a vacuum line.. nah I think I got it.

 

Take the wastegate OFF and if it still creeps ( probably will) then you know the manifold is your issue...

 

I've seen manifold that are leaps and bounds better than this one still cause boost creep.

The WG port looks very inefficient. You could attempt to hog it out and try to make it better but honestly it might not get any better. A lot of people teardrop the WG runner to give maximum flow and sometimes this doesn't even stop boost creep.

 

He has a huge crack on the elbow of the wastegate!! That's his problem! Look in the second picture in the second set he posted.

 

Crack in wg elbow won't cause boost creep. Any cracks would cause poor turbo operation ie spooling. And hus problem is boost spike