If I were you I would dump to atmosphere on the dyno as it will be the absolute confirmation of the problem if it is the wastegate. A new design may still have problems. Food for thought.

 

good stuff!! I love pictures!

 

I will resolve this before the next dyno. That is the nice thing about Haltech, I can log everything, pull over check it out and go on from there.

Hi have some good straight roads very close to my hous, so I can just pull in to the garage make changes and get back to it.

 

If you are going to adjust the W/G dump back into the exhaust, in addition to changing the angle, I would move it further downstream, if possible to minimize any turbulence as stated above.

 

Greddy TT kits just to compare had a similar problem with W/G location and turbulence that was resolved with an open dump kit that was fabbed up by 2 companies. AAM made one of them and the other was SGP. Both companies raped everyone ($600 per kit) that owned a Greddy kit, but in the end, we ended up performing much better than those that didn't relocate the W/G's.

 

Sounds like a number of kits had issues with this. I don't feel all that "dumb" any more knowing that the big names didn't get it the first time..lol


I can move the dump a bit down stream, but not much as my down pipe is short. The angle that I am going with is very low, basically going in line with exhaust flow. I think it will work fine.

The kit will come with the option of open dump, and will actually be $50 cheaper vs recirculated setups.

 

 

i have found this thread just 3 days before purchasing a turbo kit from "big name". I am waiting on the boost solution to be rectified. I am inline to purchase this kit for my Z. I too have a 06 rev up and this seems to a problem when looking for a turbokit. damn 03-05 then 07-08. Im like "WTF?" I have an 06. where is the love ? lol Any way. Please PM me with a qoute for a 06 smaller version intercooler. Is there a ball bearing option? Has the keeping of the bumper support thing been addressed for the smaller intercooler? im not looking for ungodly power just more and quick turbo response. thanks.

 

Here is the full build, detailed: https://my350z.com/forum/forced-indu...rbo-build.html

Turbo kit with 550cc injectors and fuel pump (no EMS) : $4750 + shipping

This is with the large FMIC. I only have two smaller intercoolers in stock, and once they are gone I will only offer the large one with the kit. Bumper support will have to be removed with the large FMIC.

BB turbos ara available at extra cost.

 

No. No. No. (Shakes head) You can't charge less for open dumbs because they are so bada$$. It just can't work like that.

 

Hahaha, I saw NO. No. NO and thought wth did I do now...


Yes they are bada$$, and a whole lot easier to do than recirculating the ehxaust gas. So yes it is cheaper, because it saves me time when fabricating.


BTW the car is back on the ground with w/g venting to atmosphere. I would like to go out for a sping right now but it's a bit frosty, and I'd rather not use my life insurance at 29.

I am very confident that this is the fix, as I have been thinking about it a lot and this one makes most sense.

 

Good news. I could not sit here knowing that the problems may be solved....sooooooo I went out, found a good stretch of road and punched it.

Boost log from Haltech:


RPM/ Boost

3.5k/ 5.5psi
4.0k/ 8.9psi
4.5k/ 8.9psi
5.0k/ 8.3psi
5.5k/ 8.4psi
6.0k/ 8.3psi
6.5k/ 8.0psi (letting off)

Something to note here. The w/g vacuum signal is taken right at the compressor housing, and the Haltech log is taken at the manifold. This tells me that I have a .4psi (3.5%) drop across the entire system. I am sure that this is a good indicator that the system flows very well.


So, problem solved I guess. Looks like the 8.7psi spring in the MV-S w/g is doing a very good job. I had to add 7% fuel my 8.7psi colum to stay at 11.5:1, so I am definetly making more power up top.

Thanks a bunch for all the input. I will recircualate the w/g tomorrow, and see if there is any changes.

 

thats awesome!!! Did you feel alot more power in the upper rpm range???

 

Frosty +15 in Sylvan lake today glad to hear you got your issues worked out, hopefully plumbing the WG in at a sharper angle will work as well.

 

So you did this test with the WG dumped to atmosphere?

 

Yes I sure did, it pulled hard all the way to red line. I am very happy with it


Yes, tomorrow I will route it back to the down pipe at a very sharp angle (with the exhaust flow) and see if the boost stays the same. I am sure it will.



That is camping weather Gord, when I went out for the drive it was 0 deg C

 

good deal. knew it had nothing to do with flanges, intakes or exhaust. You can tell thats a pretty big turbo if it takes til 4000 rpms to full spool.

 

Congrats. I think recirculating back at a sharp angle parallel to exhaust gas flow will fix things right up... Great experiment - thanks for sharing with everyone! FWIW, my internal wastegates dump right into the exhaust stream immediately adjacent to the turbine exhaust (using APS 3.5" down pipes) and so far no trouble holding boost to redline on spring pressure (9.3 psi) or with a bc up to 15 psi. Of course the gases come out parallel to one another and dump into dual 3.5" downpipes.

 

Full boost by 3700rpm, and when it comes on it really puts you back in the seat. Love it.

I will know tonight or tomorrow at the latest how recirculation works out. The way I have the new merge tube welded up, I am certain that it will work just fine. It should actually work as a venture, sucking the exhaust out of the turbine.

It is nice to see good people here willing to help. Many withhold information to make themselves feel like "turbo/FI gods". I have no problem sharing what I learn, we all start at the same point, not knowing anything.


This entire build has been here for all to see, comment and learn from.

 

Awesome Sasha!!! I am happy for you!! Good troubleshooting help from the community!!! Now get it on a dyno ASAP with vids, and pics or ban!!! haha..