2.1 KR, Should I Worry?

[badams118]

Well, I tightened the clamps & took another run today. I let it warm up. Outside temps were 46 degrees. KR is now down to .4, on my first 4th gear run. I followed with a 3rd gear run showing 2.5 KR & another 4th showing 1.8.

I am not sure what more I can do to reduce KR at this point. I am going to try a v103c & give it 50 miles to settle in before logging.

[Lex]

Originally Posted by badams118 Well, I tightened the clamps & took another run today. I let it warm up. Outside temps were 46 degrees. KR is now down to .4, on my first 4th gear run. I followed with a 3rd gear run showing 2.5 KR & another 4th showing 1.8. I am not sure what more I can do to reduce KR at this point. I am going to try a v103c & give it 50 miles to settle in before logging.

what are your LTFTs at this point?

[badams118]

I'll get a log of that. I just tested a v103 map, and it isn't helping. I'm going to go back to v102 & give it some miles.

The thing that pisses me off is that I know of another guy with the same mods testing the same v103 maps & seeing way less KR than me. I am seriously close to selling this POS car before I throw a rod.

[badams118]

Originally Posted by Lex what are your LTFTs at this point?

Here are some 4th gear logs showing KR & fuel trims respectively on v102. Outside temps were low 50s & I have 30+ miles since flashing back to v102.

[badams118]

Here are a couple of 3rd gear logs of the same. KR is significantly worse (4.9) in 3rd. I also notice boost hitting 20 psi.

[badams118]

Fuel pressure looks good. Here's a log of 3rd & 4th, respectively.

[FreeFlyFreak]

Originally Posted by badams118 Well, I tightened the clamps & took another run today. I let it warm up. Outside temps were 46 degrees. KR is now down to .4, on my first 4th gear run. I followed with a 3rd gear run showing 2.5 KR & another 4th showing 1.8. I am not sure what more I can do to reduce KR at this point. I am going to try a v103c & give it 50 miles to settle in before logging.

You did all the clamps between the airbox and the turbo as well right?

[Lex]

Reseat the gasket from the stock plastic inlet pipe to the turbo inlet and then tighten it up good. I have a good feeling you will see a good improvement on knock.

[badams118]

I tightened all the clamps i could find.

The ones on both ends of the blue Cobb intake hose, on both ends of the hose from the turbo to the intercooler, on both ends of the hose between the intercooler & the intake...

I'll try to find where the stock plastic inlet pipe connects to the turbo inlet & check that next if I can find it.

[FreeFlyFreak]

Originally Posted by badams118 I tightened all the clamps i could find. The ones on both ends of the blue Cobb intake hose, on both ends of the hose from the turbo to the intercooler, on both ends of the hose between the intercooler & the intake... I'll try to find where the stock plastic inlet pipe connects to the turbo inlet & check that next if I can find it.

Yes that is the one that I have read causing knock. Inlet side of turbo clamp loose. If you can find the turbo you can find the inlet clamp.

[badams118]

Well, I finally ripped the intercooler & battery out to get to the turbo inlet clamp. I tightened it down as far as I dare without stripping it. I didn't give it any miles, but I decided to take it for a run since this has helped so many others. Well, I'm still getting 1.4 KR in 4th & 4.9 KR in 3rd.

[badams118]

Fucking a, I think I found the problem...

[MZRDISI4]

Originally Posted by badams118 Fucking a, I think I found the problem...

[AutoXRacer]

Originally Posted by badams118 Fucking a, I think I found the problem...

[badams118]

Its the fuel pump. If you see the fuel pressure line, it falls on its face just as the boost passes 15 psi & KR kicks up. Its the engine trying to keep AF in line. It is classic fuel pump failure. I should have figured it out much earlier in hindsight.

[badams118]

One more thing. I believe this is also related to the P0421 CEL I have been seeing. It popped up again on that fuel cut run. I bet the exhaust is throwing the CEL because the AF is out of line going in. Id put money on it.

[AutoXRacer]

So what are you going to do?

[badams118]

I have a CP-E unit on order.

[badams118]

Well, I got the CP-E pump installed. I am paranoid shitless about it. The engine sounds like it has a slight tick (I only notice it with the hood up). It is also putting out a fair bit of white smoke (water vapor). There was a little water on the ground behind the exhaust. I took a log at idle & blipped the throttle (attached). There was no CEL. I am thinking about bringing it by the local shop just to make sure everything is a-ok. So many hoses & shit removing the intake & intercooler that I probably fucking forgot something... who knows.

Updates to follow...

[badams118]

Took it for a little drive around the neighborhood. Pressure is there & there is no KR. It seems to run normal, but A/F is not making me feel comfy.

[badams118]

Took another drive, went WOT in 3rd from 3k to 4k. AFR dropped nicely to ~10 & fuel pressure held, but KR jumped to 3.2. Definitely not the results I was looking for.

A closer listen to the engine ticking definitely sounds like it is coming from where the FP is. Probably due to not oiling the spring before I put it it. I think it is safe enough to drive to work, though. I'm gonna give it about 50 miles, then run another log.

[AutoXRacer]

These engines tick normally...the fuel injectors and the FP tick...

[badams118]

I think you're right. I am just so paranoid with all these blown engines. Right now I am just hoping that the KR will drop with some miles.

[AutoXRacer]

Yeah, me too... Everytime I drive my car, I'm expecting the engine to blow...
I want to get rid of this car just for that reason...this sucks...

Regarding your knock, make sure you put 93 octane in there, if not, add some octane booster; I've used NOS Octane Boost Racing Formula. Works pretty good.

[badams118]

That's a good idea. I am going to do that on my next tank.

[badams118]

Well, I threw some oct booster in the tank & filled it up. I drove around until I had over 50 miles since I bolted on the pump. I did a 3k - 4k in 4th, and it showed 1700+ FP, dropped to below 11 AFR & had 0.0 KR. So far, so good, even if the pump hasn't quieted down in the slightest...

I'll venture a 3-6k run after lunch.

[Lex]

Watch for knock as it usually comes on between 4.5-5.5K RPM.

[badams118]

So... I'm still getting KR as high as 3.5. So much for the fuel pump solution.

Attached is a log of 3rd & 4th, respectively.

[Lex]

Originally Posted by badams118 So... I'm still getting KR as high as 3.5. So much for the fuel pump solution. Attached is a log of 3rd & 4th, respectively.

Very similar to how my logs look. Here's a 94 octane 4th gear pull. Mods: ETS TMIC, Test pipe, COBB SRI. Stock tune.

But you have the AP. Can you do a log showing timing advance, 4th gear pull just like you did it here?

[badams118]

Originally Posted by Lex Very similar to how my logs look. Here's a 94 octane 4th gear pull. Mods: ETS TMIC, Test pipe, COBB SRI. Stock tune. But you have the AP. Can you do a log showing timing advance, 4th gear pull just like you did it here?

That does look a lot like my log. Just for shits, I decided to throw v103c on. It's not helping. I am trying to decide if I want to run the logs Christian wants to look at after I get 50+ miles on the reflash, or go back to the (safer) v102.

Either way, I'll get another v102 log showing timing adv for you after.

[Lex]

Originally Posted by badams118 That does look a lot like my log. Just for shits, I decided to throw v103c on. It's not helping. I am trying to decide if I want to run the logs Christian wants to look at after I get 50+ miles on the reflash, or go back to the (safer) v102. Either way, I'll get another v102 log showing timing adv for you after.

Is 103 knocking lots too? I just want to see how much advance you are running compared to stock. I know the v103 maps have quite a bit less timing than the stock tune.

[badams118]

Yeah, I get more KR on v103. It would make sense assuming I have an air leak between the maf & the turbo, and that v103 is giving me more sustained boost.

I decided to play it save & flash back to v102 for now. Once Cobb releases their turbo inlet, I'm gonna bolt it on & put t-bolt clamps everywhere from the filter to the intake. If that doesn't fix it, I give up...

[badams118]

I've begun wondering if it isn't possible that this could be a leak coming from my BOV? The only hoses without worm clamps are the ones from the BOV to the inlet. Maybe the BOV itself is leaking?

I need to find a way to test this theory out.

[Lex]

A leak from the BOV won't cause it since it would mean less boost that you are running and the air would return to the intake of the turbo anyways.

[badams118]

Originally Posted by Lex A leak from the BOV won't cause it since it would mean less boost that you are running and the air would return to the intake of the turbo anyways.

But it is unmetered air, right?

[Lex]

It is you LOSING metered air - not you taking in unmetered air.

[badams118]

Here's a log of 3rd & 4th respectively including spark adv.

[badams118]

So I had a mechanic look at the car yesterday. The only thing he suggested was a thermostat that opened at a lower temp...

[slo4now]

Man these cars are a bitch.

[AutoXRacer]

Originally Posted by badams118 So I had a mechanic look at the car yesterday. The only thing he suggested was a thermostat that opened at a lower temp...

Thats a bad suggestion in my opinion...

These engines run with pretty tight tolerances, putting in a cooler thermostat will induce premature engine wear.