iceblue

Just looking for some opinions. Ben test driving the TII project for the past few days. I only had a down pipe on it and I tryd not to boost during thows test drives I hit 5psi twice. I put the exhoust together today. It was the catback assembly came with car with 2.5 in pipe. I used a 2in flange bolted up to the 2.5in down pipe. This is a quite leaky setup. This was to quit the car down for the day and I could pull it down and take to exhoust shop and say make me this pipe bent all like this since they will not work on it with no cats. So I am driving it today like this making sure evrything is going well took for several decent length runs to watch the cooling system closly get all kinks out of car. Stop and titen IC clamps a bunch and im boosting 8 and 9 psi very well. The car hangs up just as if you had bad cats so I am setain the exhosut mufflers are all cloged up or just trashed period. I noticed one of the nipple caps came off the top nipple VAC source on the TB. So I am driving to the auto part store hit 8psi twice and all of sudden car wont boost over 4psi. I get to store put cap on no more vac leak. I test run it 4psi is all I get. I check for leaks or lose IC clamps I look and see down pipe bolt has rattle a lil lose. I baby home I titen this all up and run again. 4psi is what I get. I pulld over playd with MBC get back in 4psi.

So anyone know of some kinks here or is it probly exhoust just got to cloged up now and wont allow enugh flow to boost.

Mx6-Rx7 Addict

My head hurts.



Check for all vaccum/boost leaks.

-Justin

Impreza2RX7

Look around for Vac leaks, I doubt its the mufflers. If you want, take them off and drive with an open dp to make sure.. You sure you didnt blow off the FPR vac line?

iceblue

Eww good point see thats why you ask for other input I didnt even check the FPR.

I was runing on a DP during first test runs. The car semd hesitant and then come alive but I did not drive it hard. When I put the exhoust together car run much bettor but just had that feel of cloged cats thow I only have 2 mufflers on it. I have not brought the car over 5 grand yet.

does it matter if if the FPR, TS and TS silinoid are hooked up to a nipple that read both VAC and boost or only VAC?

Impreza2RX7

FPR is the angle nipple to the firewall, should read vac and boost. Whats TS?

iceblue

twin scroll

iceblue

Ok I pulld the UIM off today found the leak. It was the angeld nipple on the inside of the LIM. The cap blew off I guss. I moved the FPR to this nipple and caped the one in the TB I had it originaly going to. I reseald the ACV plate it was leaking some. And removed the TPS it went bad untill I can put another one on it.

Man the car runs so much smoother now! A bad TPS will fubar your ride all up.

But my boost still isnt boosting as much anymore. I am only geting 5PSI of boost. No matter what way I turn the MBC, all the way out or in I still push 5psi. I was pushing 8/9 all day long for 2 days and I can noticably tell a HP differeance from 5 to 8. This asures me guage is not off.

The exhaust hasent changed. 2.5in DP to a 2in flange with 2.5in pipe the rest of way. 2 gay *** mufflers and thast it. I was pushing 8psi on it 3 days ago. Does anyone have a clue?

Impreza2RX7

Did you check to see if the turbo was on the way out while you were messing around with it? Also, if it was cold when you tested it, and hot as ***** now, you'll see a loss of boost..

iceblue

Turbo had very very little shaft play when I installd it. No I drove it for around 8min and boosting 8. parked for 15 drove 10 more boosting 8. parked. went to oreilys let warm up first boosting 8 for first 4 miles then 4/5 since then and was driving when it stoped pushing 8. Like 8 shift 4.. hmm stop go 4 shift 4 shift 4 and now thats hwere its at.

MARTIN

disconnect the line to wastegate and build up boost very slowly.. see if it gets to where you want. If it doesnt make a move towards more boost, then either your wastegate flapper is disconnected from the rod, the actuator is faulty, or the turbo is just gone....

iceblue

thx MARTIN. I will go with " wastegate flapper is disconnected from the rod, the actuator is faulty" lets say this is it what do you do to fix that or asses it? the turbo has 55k miles on it.

MARTIN

There is a pin that holds the rod to the flap, if its missing the rod could detach and allow the flap to just stay open. If that is the case then the boost that you are seeing is just basically boost creep. I would suggest just checking the rod cause I have never heard of a faulty actuator to be honest. IF it is connected then you need to see if its your turbo, do what I said in my previous post and disconnect the boost line going to the WG. If you still cant get boost up then its prolly a faulty turbo.

iceblue

I finally found the issue. I had no spark from my L coil pack and car was running on the T only. When tested the car for spark everything was fine. I didn’t figure this out until I was trying to time the engine further. The light pulled no signal from L but did from T. I checked for spark and nothing on L. Car just didn’t seem to idle right and L plugs were burning as car was super rich. I disconnected and cleaned the connector on the L coil pack and stuck it back in and I got spark. I timed it then and everything showed up perfect and 3ATD retard. Drove car and had an intermitted hesitation. I played with L coils and seemed when I moved the wire harness it cleared up and come back. I took it back to my garage and cut the harness open. I cut a splice into the L coil wires as fare down as I could go. I checked the OHM resistance of the wires. I received 0ohm and moved the wire around and pulled 27ohm resistance on it. So bad wire. I cut them at the end of the harness and took new wire spliced and wrapped together and soldered them up and test again. 0ohm on all wires no matter what. Re taped and loomed the harness. Timing on idle smooth as a baby’s butt and boost is back.