Datalog review?

[Jay159866]

Hey guys, still chasing down my boost issue. I was running the 101 5/8 gates on the 4th hole to the passenger side and was making 10-15lbs of boost. It was very inconsistent so I switched to a 100 1/2 gates and it made it worse. It only made 5-7lbs. I swapped back to the 101 5/8 on the 4th hole and now I'm making 11-13lbs.

I bought an ARS tensioner but it didn't solve the problem.

Can anyone here review my log and see if something isn't right? I've watched a video or two on reviewing them but really not sure if something is wrong.

I did 3 pulls and paused it in between.

https://ufile.io/chusw

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[markmurfie]

https://datazap.me/u/markmurfe/log-1509939612?log=0&data=5-7-10-15&solo=4-5-7-12-15

86.68LB/min is a PID maximum. I like it cause it gives a nice onscreen flat reference line in datazap. Looking at your load and MAF frequency, I don't see belt slip as they climb right to peak RPM to about the same point in each gear and each pull. If your missing boost, its leaking or your measuring tool is malfunctioning.

 

[Jay159866]

https://datazap.me/u/markmurfe/log-1509939612?log=0&data=5-7-10-15&solo=4-5-7-12-15

86.68LB/min is a PID maximum. I like it cause it gives a nice onscreen flat reference line in datazap. Looking at your load and MAF frequency, I don't see belt slip as they climb right to peak RPM to about the same point in each gear and each pull. If your missing boost, its leaking or your measuring tool is malfunctioning.

Thanks! I'll try a different gauge again and check for leaks.

 

[dubster99]

I doubt you're getting belt slip with that tensioner too. It's gotta be leaking somewhere. What are you using to measure boost? I've seen boost boxes that were not accurate. More importantly, how does the car feel? Does it feel down on power?

 

[Jay159866]

I doubt you're getting belt slip with that tensioner too. It's gotta be leaking somewhere. What are you using to measure boost? I've seen boost boxes that were not accurate. More importantly, how does the car feel? Does it feel down on power?

It doesn't put you back in the seat like it did before. It won't build 10+lbs of boost in any gear except 1st or 2nd.. I'm using a AEM x-series boost gauge. I brought the car to a shop to have it looked at, they wanted to charge 2 hours to do a leak test ($200) but they were nice enough to hook up a brand new gauge and dyno the car, which only dynoed 550 at like 6 lbs. You can feel the difference when doing run after run after run. Some feel strong, some feel N/A.

It all started when I broke the DS, the car hasn't felt right since then. I noticed the shaft seal on the paxton was leaking, I took it apart and put a new seal in it which fixed the leak. Everything inside of the SC looked good.

I took the piping system apart and noticed all the pipes smell like raw e85 and there was some oily liquid coming from the pipe that connects the SC to the BOV pipe.

JPR is going to look at the car after they come back from Mod Nationals but I'd like to figure it out before then. I'll see if I can find another shop to leak test it.

 

[markmurfie]

.87g in second
.53g in third
.39g in fourth

Calculated average g's from your logs. Tire slip aside, I would say thats putting you in the seat pretty well.

2.3-2.4 peak load I would not have guess you were only seeing 13 PSI or even 15 PSI. I would have thought low 20's.

Fuel trims are not indicating any un-metered air leaks. Do you have any log from a pull you say feels NA?

 

[Phil@JDM]

Have you checked for any vacuum leaks? At the base of the supercharger, the throttle body connection, or vacuum lines? If you can feel a difference then it most definitely would be a vacuum leak. Is it idling any differently? If the belt was slipping you would see some fraying on one of the edges usually and you can hear the belt slipping because the rpms and boost can spike and then come back down

 

[Jay159866]

.87g in second
.53g in third
.39g in fourth

Calculated average g's from your logs. Tire slip aside, I would say thats putting you in the seat pretty well.

2.3-2.4 peak load I would not have guess you were only seeing 13 PSI or even 15 PSI. I would have thought low 20's.

Fuel trims are not indicating any un-metered air leaks. Do you have any log from a pull you say feels NA?

I can go log some more tonight. I am running the Tial 50mm BOV with a -2 psi spring, if that makes a difference with the logs.

Any idea why the pipes smell of raw fuel now? They didn't before. When I had the bov flange welded on, the guy said there was a build up of fuel / carbon.

 

[Jay159866]

Have you checked for any vacuum leaks? At the base of the supercharger, the throttle body connection, or vacuum lines? If you can feel a difference then it most definitely would be a vacuum leak. Is it idling any differently? If the belt was slipping you would see some fraying on one of the edges usually and you can hear the belt slipping because the rpms and boost can spike and then come back down

I have checked and replaced one line that was collapsed a few weeks ago. The idle is fine but sometimes the engine will start up, idle down and stall. It did die on me twice last week while I had the brake on, clutch in and steering turned.
I'm not seeing any fraying but the belt is getting black marks on it. The pulleys are starting to lose their black coating.

 

[Jay159866]

.87g in second
.53g in third
.39g in fourth

Calculated average g's from your logs. Tire slip aside, I would say thats putting you in the seat pretty well.

2.3-2.4 peak load I would not have guess you were only seeing 13 PSI or even 15 PSI. I would have thought low 20's.

Fuel trims are not indicating any un-metered air leaks. Do you have any log from a pull you say feels NA?

Here's tonight's datalog. The very last pull was in 3rd gear, only made 9.5lbs of boost.

https://ufile.io/g273g

It won't let me load to datazap due to the file size. :headbonk:

 

[markmurfie]

It doesnt look any different from all the other pulls.

https://datazap.me/u/markmurfe/log-1510117647?log=1

I broke the log into three parts and uploaded it.

Your short trims, Very rarely, show a lean condition. There is just always too much fuel.
They are maintaining your actual AFR ok, but it could be the cause of the smell in your pipes.

During the pulls its rich but not nearly as much while you are idling/ cruising. You may have a stuck/ bad injector, injector connector wiring, or fuel pressure regulation problems. The closer you get to peak fuel demand the better the trims get. Not sure how you would have fuel problems and boost problems with out a MAP reference line for your fuel regulator dangling leaving a hole in your manifold and excessive fuel pressure in low MAP conditions.

 

[Jay159866]

It doesnt look any different from all the other pulls.

https://datazap.me/u/markmurfe/log-1510117647?log=1

I broke the log into three parts and uploaded it.

Your short trims, Very rarely, show a lean condition. There is just always too much fuel.
They are maintaining your actual AFR ok, but it could be the cause of the smell in your pipes.

During the pulls its rich but not nearly as much while you are idling/ cruising. You may have a stuck/ bad injector, injector connector wiring, or fuel pressure regulation problems. The closer you get to peak fuel demand the better the trims get. Not sure how you would have fuel problems and boost problems with out a MAP reference line for your fuel regulator dangling leaving a hole in your manifold and excessive fuel pressure in low MAP conditions.

Thanks! :cheers: I'll take my injectors out and take a look at them and recheck all the wiring. The vacuum to the FPR is unplugged, as lund requested but other people that have looked at me car say they like it plugged in. Not sure how other people have it done.

Thanks again.

 

[Tommy V]

Leaving the regulator unplugged may be why u are rich at idle and cruise.The vacuum lowers your fuel pressure at idle and cruise and when u go wot the regulator gives u full pressurs.I don't see why they would have u keep it unplugged.Plug it back up and see if it helps your fuel trims at idle and cruise.

 

[Jay159866]

Leaving the regulator unplugged may be why u are rich at idle and cruise.The vacuum lowers your fuel pressure at idle and cruise and when u go wot the regulator gives u full pressurs.I don't see why they would have u keep it unplugged.Plug it back up and see if it helps your fuel trims at idle and cruise.

I'll plug it in and do a quick log tonight.

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