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Nate355RS

Proven Member
446
50
Oct 25, 2012
Salem, Virginia
According to my butt dyno and my log it doesn't look like my car gains any HP after I rev past about 4000rpm. It's just a flat consistent pull.

I should also note that this isn't my Talon. This is on a Galant VR4 with stock longblock with Cyclone intake, 2g exhaust manifold, Evo3 16g, FMIC, 673cc injectors, and an Evo8 MAF. The turbo spools great and spikes to 20psi almost instantly and then comes back down to 18psi for the rest of the pull.

Also my Cyclone intake's actuator is unhooked so the butterflies are open all the time. Apparently I need ECMLink v3Full to control the butterflies so for now it's unhooked and uses both the short and long runners at all time so it should flow similar to a 1g intake from what I've read on here. I wouldn't think it would be a restriction but I'll mention it anyway.

Is there something in the tune I'm missing that's causing this?
 

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Your airflow and fuel flow are both completely constant from the moment you hit 100% throttle at 4200 until you let off at 6000. And since your AFREst matches your LC1 perfectly and they both reflect the tune, I can't imagine that it's something in the tune.

BoostEst drops off steadily during your short pull all the way to 12.5psi. That would definitely explain the lack of power. Is there any way that there's a problem with the boost controller or an exhaust leak? The rest of the log looks beautiful, so I'm thinking that you might actually be out of boost. I once saw a guy with similar problems and it turned out that he ran over something that kinked his exhaust and gave him a massive restriction at higher RPMs.

When you post logs, please trim them down to a relevant section. You have 500 seconds of log for a 5 second pull.
 
Sorry about the long log, I'll keep it short and to the point in the future. I've done a boost leak test and it holds 30psi easily, MBC also held boost as it should. And when I go WOT I'm not seeing much of any timing being pulled.

The BoostEST being low is confusing because my boost gauge says it's hitting and holding 18psi. I'll check my exhaust for leaks and dents. It almost looks like there is an intake or exhaust restriction that won't allow more airflow after about 4000rpm.
 
IDC is right arount 60% at the top end.

I was able to put it on a lift for the first time since I bought it last night. I think randman was onto something, here's a few pics of the exhaust. There are a few things that need to be addressed, and I think I've found my bottleneck(s).

It has a 2.5" turbo back on it, and a 3" cat. Not bad, but it has a dent in the down pipe and two mufflers on the back. And if you look close you can see the two mufflers are connected with 2.25" pipe. So I have an older cat, dented downpipe, small section of 2.25" ID pipe, and two mufflers. I think it's safe to say flow is being hindered.

Before I start replacing exhaust pieces I'm going to take the cat off so it's just an open downpipe. Even with the dented downpipe I think it would make a huge difference, and should tell me if that's my only problem.

I'll post an log up tonight. Hopefully I'll see some big airflow improvements.
 

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Bumping this back up, I ran the car open downpipe for a while and it spooled faster but flatlined just like before except the plateau was a little higher so I don't think it's an exhaust restriction. I did a few more boost leak tests and exhaust leak tests for my own sanity but didn't find any leaks.

I also replaced the MBC with a known working one from my Talon. While I was at it I replaced the fuel filter, put in new BR7ES gapped at .028", cleaned my 4" cone air filter but it still doesn't gain any power after it hits full boost at WOT. Compression was also 150 on all 4 cylinders and the turbo doesn't have any shaft play or signs of abnormal wear.

My FMIC core isn't gigantic at 18"x6"x3.5" but with my ported EVOIII 16g I think it should support more than 190whp. My boost gauge holds steady at 18psi so the air is there and the fuel is there but power just isn't and the car feels just like the ECMLink dyno graph reads, slow. Anything else I'm missing that I should check?
 
Closest awd dyno is a long way from me, but there is a track right down the road. I think your right, seeing how it actually performs would be interesting. I've been racking my brain trying to figure this out for a long time now
 
1. You need to clip the log to only the part you are wanting people to look at
2. You're running pig rich
3. You're running hot
4. You're losing air somewhere...quite a bit of it if you are on an 18G and airflow is even close to calibrated.
5. Your pull is in second gear instead of third, and starts at too high of an RPM. You need to do a third gear WOT pull on flat ground, starting at around 2500 RPM
6. It's really hard to see what the turbo is doing, since you aren't logging boost and only took it to 5800 rpms.
 
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Sorry, this is on my Galant with and EVO8 maf and a 16g not my Talon with the 18g. I just created a profile for my VR4 so hopefully it will show in my signature.

I'm running a rich map because I wanted to be safe while I dialed it in, would running closer to 11.0:1 be a better idea?

The fans on my the Galant seem to turn on at 210* and the car normally runs between 200*-210*. From searching on here it seems like that's fairly common operating temp. Car has a new radiator, fresh coolant, good compression and doesn't look like Link can control fan settings on a 1g. I'm not sure how to make it run any cooler.

I'll lean out the DA tables and make a pull from 2500 in 3rd and post it.
 
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