Well welding the WG on the turbine housing helped but didn't totaly get rid of the problem believe it or not Instead of spiking to 17 psi at 6900 it now only goes to a MAX of 13psi with the 7.25psi spring.

Here is some info (rpm, boost pressure, ign advance) from last year datalog compared to this years.
Last year: Air temp 80-84 deg F
6020-10.5-14
6220-12.3-14
6340-12.8-13
6520-14.3-13
6660-15.0-12
6780-15.4-12
6900-17.0-10

This year: Air temp 67-70 deg F
6340-10.7-20
6400-11.2-18
6580-11.6-18
6840-11.6-17
6960-11.9-16
7160-11.9-16
7280-13.0-15
7460-13.0-15

Some more notes:
- As you can see this year I have a tad more igniton advance.
- The air was ~12deg colder this year.
- This year I have tied the WG dump back into the DP witch I would think would aid in boost creep.
- I am running a tad richer this year at high 10's- low11's vs low 12's of last year.

What ign advance should I be running for a stock ported 13B-RE anyways? I'm assuming I can get away with more than a ported engine??

Can any of you guys give me an idea what I should look for or change?
Thanks!
-Cam

 

heres my 2 yen on boost creep.
When you put the waste gate exhaust back in the your down pipe you created a restiction there so more exhaust will be forced through you turbo causeing more boost. Undo that. How far is your waste gate from the exhaust manifold? Next, your down pipe is to big. Go with a 2.5 down pipe. This will cause a restriction at the turbo and make the exhaust go through your waste gate more. Another thing to do with your down pipe is put a exhaust restriction valve in your 3 inch down pipe. Then you can adjust the amount of exhaust that passes through your turbo. Controlling boost creep starts with resticting the amout of exhaust that passes through your tubine.

I have to agree with what RiceRacing said, "Make 15psi your low boost level" and let it go. sounds like you have all the mods to run 15psi with good results.

The last few weeks I adjusted the EBC down to 10psi and the highest psi I got was 13psi in third gear at 6500rpm's. My 35mm waste gate is 3-4 inches from my manifold and it is conected to the manifold right before the turbo. This is with a .96 a/r p-trim T66.

Turn that thing up to 20psi, thats when the fun starts.
chuck

 

What kind of porting?
What is your turbo exhaust manifold design?
What kinda turbo?
What size pipes for downpipe?
What size pipes for wastegate?
What size pipes for exhaust?

Sorry, I can't recall if you posted all of this info previously.


-Ted

 

Get a bigger Wastegate.

 

Dont know what size wastegate you have but , I would think an additional one or even a larger one would cost less than a rebuild.
I use a pair of 35mm Tials , together they control boost quite well at the 12psi spring pressure , I have hit 9500rpms with my bigass (TA51) turbo and the boost is rock solid , but after selling my boost controller (to get an e boost) I set it up so that only one WG would operate and guess what , 15psi by 6500rpm !!! in third gear . By the way my WG's are plummed back into my DP, what you need is a large enough "hole" (WG)around the turbine so that enough exhaust gasses can pass without having to go through the turbine.

 

https://www.rx7club.com/showthread.p...hreadid=246945

This is kinda confounding, setzep :P

 

How about trying a heavier spring in the gate, maybe the 7.25 is to light.

mike

 

chuck- I'd rather not make a 2.5" dp, last year I made a restrictor for the exhaust that had a 2.0625" hole in it and it didn't help. That was with a open WG.

I know that I shoulden't be messing around with such low boost but it just gets at me knowing that I can't run 10 psi if I want. I wanted 10 to be my low and 15 to be my high setting. 20psi isn't really worth it to me. I like to feed my car pump gas and drive it. I'd rather not have a busted engine and drive my stinkin Acura.

ReTed-
- I said stock porting
- it's totaly divided, equal length, 13" long and 1.69"ID
- TD07
- 3"
- 1.625"
- 3"

Directfreak- That is a option that would probably work for me but I'm not ready to fork over that kind of dough. I guess I'd rather just live with 13psi before having to go through putting in a new one and trying to sell mine to recoup the cost.

Marcel- I use a single 46mm tial Y'ed off the turbine housing at about the best angle you can get. Now I'm thinking my main header runners are too small in diameter causing to high of velocity above 6300rpm. Below that rpm you can see in the datalog how the WG actually hunts a bit but after 6300 it will steady out and slowly start to climb.

$150- ?

LTProject- I have a 13psi spring I should throw in there to see if it will hold 13 solid to 7500. Maybe I'll just have to live with a low setting of 13psi.

Tomorrow I'm going to do a bit of porting to the turbine housing and where the WG dumps back into the DP. There are a few ledges that can be taken out yet. I'll let you know how it goes.

Does anyone know what would be good timing for my engine?? Am I running too much timing durring boost or is it ok??
Thanks
Cam

 

Setzep this week I will get off my *** and measure the Two Tdo7's that are now here...one is a 25a and the other is a 25g(and both for sale! shameless plug)...
If it wasn't getting into the driving season here, i would take the time to fit them to my car to test, however with the limited amount of time I have, I plan on only swapping to the TV-51 this year..
It still has to lead back the turbine that you have I think... I am running a partial bridge now on my manifold t04e setup, the engine moves a ton more air, and fuel over the streetport, but creep is still not an issue for me with the p trim...
The 25g, turbine wheel itself looks very close to the p-trim wheel of the garrett, however the turbine housings are alot smaller on the mitsu's than the my t04e....
Can you PM an email address , I will send you my current haltech map....Max

 

http://www.nopistons.com/forums/inde...0&#entry511448

Cam check out the link. It is a dyno sheet of Ranzo's 5th gear dyno pull. The black line in the middle is his boost. Never went over 15psi. His waste gate is small, maybe a 30mm. I know it is allot smaller then my 35mm one. He uses a hks cast manifold with a TDo6, T3 flange. 3 inch exhaust. Intake ports are up 5mm and out 2.5mm. Exhaust ports were ported down and out to the difuser. This is why I don't think you need a bigger waste gate.
Max may have hit it right on the nose. Your turbine will not boost less then 13psi with your set up.

Have you thought about water injection? A good set up is a few dollars more then a bigger waste gate but it will allow you to run the boost levels your getting, safely. Also the water injection will allow you to run pump gas. The reason why I said to just run what you have is I know your craftsmen ship level and your attention to details is better then most. So your tuning abilities should allow you to run 15psi safely.

The 2 inch restriction has me confused. I guess all the hipe about upgrading a stock exhaust to a 3inch one is a waste of time and money. If power levels can be obtained with the stock exhaust, why go bigger for boost levels under 15psi.
chuck

 

I did it! I took the turbo off today and did some more porting to the turbine housing and also to the DP and now it holds 9psi till 7200 I don't know if I'm going to sleep tonight I'm so happy with the results. I also added a few shims to my BOV so it woulden't open so easy and now for some reason I can hear compressor whine a lot more than I could ever before.... strange... I like it! Now I have turbine noise out the tail and compressor whine under the hood I also messed around with the throttle pump and throttle pump deadband a bit and I gained a ton of responce. Before If I gave the gas a quick jab it would almost die then rev. I took all the throttle pump deadband out of it and added a bit in the 1500 map and it's awsome now. I've never had such a successful day
While I had the turbo and manifold out of the car I took a pic to show how everything is run. I'll post it in a min.

 

well it won't let me upload a pic...

 

Glad to hear everything worked out for you!!!

 

GREAT news Cam, now dyno her!

 

CONGRATS!!!!!!

 

Please don't say this is what you did.

http://groups.msn.com/ChucksRX7/1983...to&PhotoID=542

This is a T3 60-1 turbo I use to run on my n/a motor a while back, ported the turbine housing to increase the space between the exducer part of the wheel and housing. This turbo pushed my first gen to 123mph in the 1/4 when everyone was telling me it was to small.
chuck

 

i have followed your problems, i was just crossthreading for info. I was as confused as you.

Glad to hear you fixed it. That's all.

 

enzo- thanks again! I owe you.
88fc3s- so am I! Once I get the car how I want it may see the dyno just so I know what power it has.
DF-
Chuck- I ported the area where the pipe meets the turbine housing, not near the wheel. When putting it together the first time I didn't think it would matter much to have a nice even radius from the turbine housing to the pipe but I guess it did. I didn't remove a whole lot of material, I spent more time making everything "rounder".
Sounds like you proved a few people wrong with your old turbo
To answer your question a couple days ago about the restrictor in the exhaust... It was a plate with the hole in it I tack welded to the tip of my exhaust. I would still get creep but it would happen later in the revs. I'm guessing it had to drain a little power but I coulden't tell from the seat of the pants.

$150FC- ahh... IC now thanks, it's been a long journey.

One thing I noticed with my new WG location is boost responce, it's a lot better (wasn't bad before). I can get pos mani presure at 2300rpm vs ~2800 with the old WG location. It hasn't lost any top end either. Today going home from work I went ot pass a S-10 blazer in 3rd and at ~6000rpm the tires started to spin I'm a happy camper right now

 

get those pics up of what you did

 

Right on. Glad to see that it has worked out. I'd like to see the pics also. I might need to apply some of your techniques to my new mani

-Chris

 

congads good work

 

Thanks guys but the forum still won't let me upload the pics

 

Damnit I wanted a ride at 20psi!
Cam I can post the pixs for you.

 

where's the pics ?

this is old as heck