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Old 07-11-2016, 04:33 PM   #1
SL1
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Default 02 WRX with stock TD04- spooling very slow

Hey guys- I have been around NASIOC and looking for posts regarding the issue I am having with my turbo and I can't find a clear culprit. I have a 2002 WRX with 180K miles, I use it to daily for now and RallyX. I have a full catless exhuast, catless downpipe, JDM catless up pipe, Aeromotive 340 lph fuel pump, Hallman Pro Manual boost controller. I went to get a tune and they found some vacuum leaks, which makes sense since I though my car felt like a dog. I fixed all the vacuum leaks, built my own tester, and ensured no more leaks. I did the timing belt when I rebuilt the top end in January due to a burnt exhaust valve. My turbo even with the MBC will not build more than 16psi. In 5th gear at WOT, it takes forever for the turbo to build boost. I don't hit max boost in 4th gear until like 5000-5500 rpm. From what I have read on here, I should hit max boost at 3k. I know there aren't anymore boost leaks, and I am 99% sure the timing is correct. I have a stock airbox with a K&N filter in it, no hot air intake . I have been told that it's either my wastegate actuator or my turbo going bad. What do you guys think? I have no smoke out my tailpipe from turbo, and there was very minimal oil in my intercooler. The shaft play on turbo was small as well. I don't know what it is. HELP please!
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Old 07-12-2016, 10:21 AM   #2
Fast03Wagon
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Checked for any pre-turbo exhaust leaks?
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Old 07-12-2016, 12:19 PM   #3
Brother EddieJ.
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5th is a cruising gear. It will take forever to build boost.

Some 4th gear logs would be ideal. I find it very hard to believe boost is coming on that slow even after you fixed all the leaks.
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Old 07-12-2016, 02:19 PM   #4
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Its not letting me post attachments.... I have the excel file of a 4th gear pull from 2k-6500 RPM. How can I show it to you guys? I checked for exhuast leaks and there are all new gaskets on that I put on in January. Up pipe is new but its just a catless subaru one. New gaskets as well. Problem was happening before the up pipe install.
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Old 07-12-2016, 02:54 PM   #5
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Use google sheets. Excel is a thing of the past
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Old 07-12-2016, 03:28 PM   #6
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It won't let me post any attachments regardless of the format.
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Old 07-12-2016, 09:03 PM   #7
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See if this works.
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Old 07-12-2016, 09:03 PM   #8
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Old 07-13-2016, 04:43 PM   #9
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Wastegate stuck open? Have you tried bypassing the MBC and seeing if you hit wastegate pressure?

Set your google doc permissions to public so we can see it
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Old 07-13-2016, 04:47 PM   #10
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my bad, here is the link https://docs.google.com/spreadsheets...it?usp=sharing

The wastegate is not stuck open. I checked it last night and made sure it had proper alignment. This link should be public now. I haven't bypassed the mbc yet but I don't think it would slow the spool down. If i crank it all the way up it won't go past 17psi anyways. let me know what you guys think. Going to swap a wastegate Saturday and possibly the turbo.
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Old 07-13-2016, 04:56 PM   #11
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The MBC T's in and bleeds boost to "trick" the BCS. Bypass the MBC and/or log BCS duty cycle and report back.

You can build boost to around 13-14, is that the target boost that it's tuned for right now?

Has the car ever been tuned for the mods you listed? If not there's a chance it is running pig rich keeping EGTs very low and contributing to the slow boost.
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Old 07-13-2016, 05:02 PM   #12
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I went to have the car tuned when the tuner said that he couldn't do it because there were vacuum leaks and it was spooling too slow. I fixed all the leaks but it's still spooling slow. Right now I'm on the factory map, I am supposed to get it tuned for 19-20 PSI when everything looks proper. I borrowed a friends Tactrix cable so I won't be able to log with the mbc disconnected until this weekend. Did it seem very slow to you? I haven't driven any other WRX's.
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Old 07-13-2016, 10:49 PM   #13
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Tonight I disconnected the vacuum line from the waste gate and it didn't do anything. I still couldn't build more than 16psi and it didn't spool any faster. WTF?? Any expertise is appreciated. The RR log is public now so anyone can observe it. Thanks guys.
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Old 07-14-2016, 08:30 AM   #14
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When did this problem start? You list all your mods but it' not clear if you slapped them all on at the same time and now you have the problem or if you changed something recently and now have the problem.

There are also different ways an MBC can be hooked up and that's not clear either. Did you install it per the instructions? If so then logging disregard my earlier post about logging EBCS duty cycles.

If you have no boost leaks then it sounds like something is installed wrong and leaving your wastegate open. I could have been more clear about bypassing the MBC for testing...hook the vacuum line from the turbo directly to the wastegate. Boost should not build more than 7-8psi. If it is able to quickly build and hold boost then you have a boost control problem.

Indeed you have some problem as you should be reaching target boost by at least 3500 rpm.
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Old 07-14-2016, 02:25 PM   #15
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Thanks for the clarification. The MBC was installed by a tuning shop when I went in for the tune. The turbo has been spooling like this since I bought the car in October. I had a burnt exhaust valve so I rebuilt the top end of the engine over the winter, then went full catless, fuel pump, etc. I though that was just the way these cars are, and hoped that a tune and a catless up pipe would help it. It will help but something is still wrong. The MBC is a Hallman Pro and it is hooked up correctly I believe. the side angled nipple has a hose to the wastegate actuator, and the bottom nipple goes to the input line on the intake manifold. It corresponds to the instructions from Hallman. I will try what you said about hooking the wastegate up and see. Do you think it is definitely either the turbo or wastegate? Timing being off could affect boost but I feel like I would notice other problems if the timing was off....
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Old 07-14-2016, 02:54 PM   #16
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I mean the other end of the MBC goes to the compressor housing nipple. Where it is supposed to.
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Old 07-17-2016, 07:55 PM   #17
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Update: I swapped the wastegate actuator with a known good one and it did absolutely nothing..... Now I guess I am moving on to the turbo. I will put a different one on this weekend. Side note, this morning on cold start the idle was a little rough and if i gave it some gas it hesitated and sputtered. Not sure what's up with that but once it warmed up it was fine. Maybe the plugs are fouling. I had a rally race yesterday and was pretty hard on it but the plugs were new NGK in January. Any other suggestions???
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Old 07-18-2016, 08:02 AM   #18
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Did you try to hook the vac line from turbo directly to wastegate?
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Old 07-18-2016, 08:29 AM   #19
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yes. It spooled pretty quickly but not any quicker than normal. The boost seems to come on pretty quick until like 8-9 PSI and then slowly build more but still never build more than 16. The new wastegate didn't make a difference either. I also double checked the proper install of the mbc and zip-tied the connections to make sure no air leaking.
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Old 08-24-2016, 11:30 PM   #20
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Any solutions to this?

While I don't have a 02 WRX, I have similar symptoms with my stroked v5 EJ207.

The last couple weeks, cold idle has been weird (seems to go into closed loop too soon) but once it's warm, it idles fine.

Today right after doing a few hard highway pulls, boost became very sluggish.

6th gear wot - 3-5psi max
5th gear wot - hits target boost around 5-6k RPM's. Pulls hard and boost holds steady after 5k though
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Old 08-25-2016, 11:23 PM   #21
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55 cents later and I'm building boost again. E-clip somehow removed itself allowing the wastegate actuator arm to disconnect from the gate itself. Wastegate was wide open.
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Old 04-30-2023, 09:49 PM   #22
Smash3337
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Quote:
Originally Posted by SL1 View Post
Hey guys- I have been around NASIOC and looking for posts regarding the issue I am having with my turbo and I can't find a clear culprit. I have a 2002 WRX with 180K miles, I use it to daily for now and RallyX. I have a full catless exhuast, catless downpipe, JDM catless up pipe, Aeromotive 340 lph fuel pump, Hallman Pro Manual boost controller. I went to get a tune and they found some vacuum leaks, which makes sense since I though my car felt like a dog. I fixed all the vacuum leaks, built my own tester, and ensured no more leaks. I did the timing belt when I rebuilt the top end in January due to a burnt exhaust valve. My turbo even with the MBC will not build more than 16psi. In 5th gear at WOT, it takes forever for the turbo to build boost. I don't hit max boost in 4th gear until like 5000-5500 rpm. From what I have read on here, I should hit max boost at 3k. I know there aren't anymore boost leaks, and I am 99% sure the timing is correct. I have a stock airbox with a K&N filter in it, no hot air intake . I have been told that it's either my wastegate actuator or my turbo going bad. What do you guys think? I have no smoke out my tailpipe from turbo, and there was very minimal oil in my intercooler. The shaft play on turbo was small as well. I don't know what it is. HELP please!

Hello friend, i know this is and old post but i dont have anyone experienced to ask.
I own ej20 same generation, same problem
Fixed intake and exhaust leaks, up pipe leak, new turbo, good engine valves, good wastegate, fine MBC, engine rebuild and strocker. (Fueltech Ft350 ecu), timming is good and everything else works nice.

Turbo initial spool at 3k rpm 3-5psi but stays there up to 4500rpm where full boost hit. (+15psi), this happened to me last time with td04 (same symptoms) and fixed when installed MBC, i don’t have idea why but it fixed. Full boost at 2900-3000rpm (17psi)
One time ecu lost energy and erase everything, when i loaded the same map the full boost where in 4500rpm area again, but maps are the same.

I installed td05 and the same symptom, full boost at 4500rpm but 3000-4500rpm at 4-5psi.
I installed MBC AGAIN, not fixed.
The car don’t have many components to fail and everything is OK.

Can’t find the culprit of this late boost, fixed everything and same symptom.

I hope you could help me or guide me to find what is retarding boost.
I don’t know where to look after all.

Pd: NO AIR PUMPS, NO AIR CONDITIONER, FORGED ENGINE.
NO ACCESORIES, Working flawless. Less than 10.000km since rebuild.

I think a lot of ej20 users are experiencing this situation, will be glad to find a solution.
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