Running lean since turbo change

[biker_joe89]

Ok so I changed the turbo on my car. l Put a Evo 3 big 16g on it. Still have stock injectors on it. But I did remove the injectors the other day when I changed turbo because I had planned on trading them with a guy. Change of plan so I put them back in so I can daily drive it. Every since that project I have been running leaner when I'm not in boost. When the turbo spools I am running richer than before when I had the stock 14b. I have the boost controller at 15 PSI now with the Evo 3 16g. I was running 16 PSI when I had the 14b on it. Does anyone have any ideas Why its running leaner now when im not in boost? Why I'm richer when boosting(My thoughts turn up the boost a hair possibly)? It also doesn't seem to have as much power as before.

 

[JayRolla]

How do you know you are lean?? WBo2? I would turn boost down to say 12psi to be safe unless you have zero knock on your logger. Also do some boost leak tests.

 

[kqodprez]

Wow. I was going to flame you but I don't think it's in my nature right now. First off you aren't running RICH you are running WAY LEAN. Here is a chart that I found.

Flow Rates @ 15psi:
TDO4-9B-6CM2 265 CFM
TDO5-12A-8CM2 320 CFM
TDO4-13G-5CM2 360 CFM
TEO4-13C-6CM2 360 CFM
TDO4L-13G-6CM2 360 CFM
TDO4L-15C-8.5CM2 390 CFM
TDO5H-14B-6CM2 405 CFM
TDO5H-14G-8CM2 465 CFM
TDO5H-16G-7CM2 505 CFM
TDO5H-16G-10CM2 505 CFM
TDO6-17C-8CM2 550 CFM
TDO6H-20G-14CM2 650 CFM
TDO7S-25G-17CM2 850 CFM
TFO8L-30V-18CM2 1200 CFM

If I were you I'd turn the boost down before you blow up something and hurt the motor. Run off of the wastgate until you get supporting mods, more fuel and a way to moniter knock and timing.

 

[biker_joe89]

sorry that I forgot to mention those things I have a air fuel gauge that is reading this. For some reason my logger isn't working right this moment I'm trying to figure it out. I know its the wiring connection. But anyways I did check when I first put it on my logger was working unfortunately I forgot to log it. But at the time I didn't get bad knock. It hit 7 at about 4800 rpm if I remember correctly. I do remember for a fact little knock though at that time. (I need to get this logger back working to figure this out). But I have been taking an easy on it though. I have been avoiding letting the turbo spool much to be safe. I will be getting the fuel support next week. But I would really like to figure this out so I'm not buying a rebuild next week instead of fuel support.

 

[95talongirl]

Wideband A/F gauge... i hope. Narrowband is pretty much useless...
Was 7 the A/F ratio you were seeing.. cause that seems way odd.

I'm with the above comments... DO NOT add more boost.... if anything take some away until you have supporting mods.

 

[biker_joe89]

7 was the knock I had at 4800ish but yes its a wideband. Even though I haven't been allowing the turbo to spool much since I realized the problem I will do as you's say and turn it down. I'm so confused on this problem maybe My gauge is bad and its just a coincidence that it happend when I switched turbos

 

[wolf0573]

Do a boost leak test. Sounds like a boost/vacuum leak.

 

[biker_joe89]

Yea I will do that I been meaning to. I turned the boost down and today still the same problem.

 

[TURBD]

+1 on boost leak. I don't know how anyone can change turbo's or IC pipes without doing one after. Takes 10 min and is so well worth it. Hope you get it figured out.

 

[tenn-gsx]

Your problem is definately a boost leak. Your sucking in unmetered air probably arround one of the injectors at idle. This causes it to be lean. Then under boost that same leak is allowing metered air to escape causing the car to run rich.(the ecu expects more air to get to the cylinder than there is because of the leak)

 

[biker_joe89]

well do you think it could have to do with the injectors or fuel rail I had it all removed when i did the turbo because I was going to trade injectors but didn't.

 

[tenn-gsx]

Your symptoms make me think its the injector seals at the manifold. Were they hard and brittle when you removed the injectors? However it still could be any one of the lines or couplers that you disconnected during the turbo swap.

 

[wolf0573]

It's possible that the injectors didn't seal to the intake manifold after the re-install. I know I've replaced plenty of injector seals myself. You wont know anything until you complete the leak test though.

 

[abaum565]

Your symptoms make me think its the injector seals at the manifold. Were they hard and brittle when you removed the injectors? However it still could be any one of the lines or couplers that you disconnected during the turbo swap.

I've had this happen before and the car would barely run, but it was a bad tear. I agree on the BLT. Also check your fpr vacuum lines. Also check the fuel pump, and that pressure is raising with boost. You can use a compressor and blow in the vacuum line going to the fpr to test the pump. Check the small oring that is on the outlet of the fuel pump also.

 

[biker_joe89]

I will be doing a leak test tomorrow for sure. And yes the seals were a bit hard but they seemed tight I had to through a little oil on them to slide back in. I'm going to be checking this thing over hardcore tomorrow.

Ok So I did a boost leak test today(made my tester and the the thing worked cherry). I had a leak on the upper hose on the inter cooler. Fixed that holds pretty solid now. So I took it for a ride and it seemed to help a little bit, not much though still running lean and then rich. I am ordering injector seals tomorrow to see if that might be the problem.