That's not a major pinch and I wouldn't think it'd block that much flow, if any. And same for the HE's bent fins and bugs; it's a lot, but nothing that would destroy your top end quite like what is happening.

And engine coolant temps really don't matter all that much, as long as they're above 60°C or so.

This makes me think that it's either the tune or the intercooler.

I think my timing was low 20's, but I can't remember exactly. Do you have an interceptor to see KR and actual timing?

 

I have interceptors was watching timing at top of 2nd and into 3rd had full spark. But my timing is really low in 3rd, about 8 I’m pretty sure. It was 4.5-5 before meth till 5000rpm (found log)

 

Do you have a way to monitor your IAT post laminova coils?

If you tune has a safety feature to remove timing with high IAT as monitored at the MAF that could be reducing the timing. I haven't had a LAP hptuners file open for a long time to remember if you have that option.

 

currently no. I’ve thought about it, didn’t want to replace IAT and couldn’t find a stand-alone device that I could easily install/ pair with a display. Would a water temp sensor be beneficial, could do in / out on the manifold?

I do have IAT spark advance correction tables though they don’t come into affect until 60C or 140F.

 

My pump is a year and a half old and does sound like a 90s dishwasher on its final cycle..

I just checked it’s fuse and it’s good.. idk could try a new pump?

 

Assuming you have a stock pump it's a mag drive pump so it shouldnt be loud. It should be relatively quiet, the moving fluid should make some noise but not a lot. Have you tried putting a light vacuum on the system? (Like 5inHg)

 

It’s a lot louder than it use to be. I’ll try to see if I can get a recording of it later.
No I have not, would I just apply it at the option b cap?

 

 

Okay, that's not a lot of timing at all. That's very likely your issue. Does the LAP have spark by gear tables? I know my LSJ doesn't. Are you getting into KR with anything above that?

What fuel are you running? 91? Access to E85? If that's all the timing you can run in 3rd, E85 would make your car soooooo much faster.

Your IAT2 will come from the MAP sensor. I'm guessing the 2.2L MAP doesn't have that capability. I'd be interested to know if an LSJ sensor could be retrofitted (guessing not). It's kind of an important sensor on LSJ's, because once your intake temps get to a certain temp, it'll start pulling timing.

If you have an IAT spark correction table... I'd have to assume it's based off of the IAT1, which comes from your MAF sensor. Not really all that pertinent in the grand scheme.

As far as putting in a specific IAT sensor, it can be done... just not sure if you could use your PCM to read it. I wouldn't use a water temp sensor though, as they'll be a solid metal element, and won't register the quick temp changes that your intake tract goes through.

Aeroforce has air specific temp sensors that can be added to the Interceptor. Aeroforce Temp Sensors

There are other options too; you'll just have to search them out. For instance, early 2000's VW's with the 1.8t had open air element IAT sensors, just a matter of wiring it in. It'll still be a 5v signal, so you can probably just plug it right into the Interceptor or HPT Pro Cable, if you had one.

I'd try to look into being able to integrate a GM MAP with a temp sensor already in it though.

My questions would be:

• Where is it getting its signal/power?
• What gauge wire did you wire it in with?

 

it gets power from the PDC, I’ll check what fuse and gauge later tonight. Yeah my car only supports IAT I could switch the feed (If I had a pigtail) but it’s one or the other.
91 no E85 in Canada.
I’ll have to ask my tuner see what’s up with low timing in 3rd maybe he’s trying to keep it safe. I could not find any timing by gear tables yesterday.
no Kr with 20 degrees in 2nd, no Kr in 3rd either.. don’t know how it could be dropped like that though without a timing by gear table...

 

PDC? That one escapes me. Sharing load and small wire can drop the voltage that the pump is seeing. I no longer think your cooling system is your issue though, since you and the car don't have a way to see post-IC temps. If timing is 20° in 2nd, then something is certainly pulling timing in 3rd - just have to figure out what/why.

And it'd likely be worth switching the IAT wire to something post-intercooler (MAP sensor, for example), if you could. It's a safety net and it can likely allow your tuner to better fine tune your timing tables based on temperature. Pre-turbo/SC MAF IAT's are essentially useless aside from being an FYI.

91 and no E85 sucks. Makes sense though; ethanol in our fuel is a result of our massive corn industry - as is High Fructose Corn Syrup being in everything we eat.

 

PDC is Chrysler talk, power distribution center or ‘fuse block’ as gm would say.

 

I’ll check what fuse tonight maybe move it straight to the battery as a source.. and I’ll do a bit more research on re-wiring the IAT2 with IAT pcm signal.
i agrée low timing in third is Very weird..

 

Husky also sells 93 here with 10% ethanol but I don’t believe.. and it’s not enough places that I would tune using that fuel.

 

Gotcha. Your current location is probably fine for the pump. You could always hit it with a multimeter just to ensure it's getting full voltage. Could POTENTIALLY be worth bumping up the wire size. I bumped the wire on my GTI's fuel pump from 18ga to 14ga and there was an audible difference. The "fuel pump rewire" kits that ZZP used to sell essentially did the same thing, and relayed it with the battery in the trunk - shorter route and larger wire. I'm not sure they still sell them, or that they were all that worth it on a Cobalt. They'd be easy enough to make if you're competent with wiring (not trying to imply that you NEED one).

 

Looks like a 14 to me and I think it’s good Too it’s taking power Right from the slot labeled PCM on my PDC and it is using the proper ‘add a fuse’ not just a power wire slipped under the fuse lol..

Ive asked the tuner about low timing, he thinks it’s possible cells need to be adjusted. Next step would be going out get a log see what we can see

 

Appreciate all the advice and info tho guys! I’ll let you know what I find next couple days.

anyone know if Jdbaugh1 is alive? He’s been mia for a while I’m pretty sure

 

You should not be anywhere near 20* of timing in any gear. That’s a lot for regular fuel

 

I’m tuned with lots of meth, 20 degrees top end.
On my DD tune its around 12-15 straight 91

 

Confirmed today for the tuner with a fresh log, 3rd gear is commanding 5 degrees (Not even 8) with no KR.

Took a look at my files last night..Can’t see anything wrong with spark by IAT tables so my theory is, perhaps through conflicting values between certain parameters (I’m not a tuner lol) A torque management event is being forced specifically in 3rd lowering timing to the minimum allowed value.

 

First thing to do would be to log and check the timing table to see which cells you're actually hitting in 3rd gear. You SHOULD be hitting approximately the same cells in all gears - that shouldn't be the problem, but it still needs to be ruled out first.

From there, you can move on to figure out if it is your torque management or TCU that is creating the condition that pulls your timing. Transmission settings seem like they'd be the most likely, in my opinion, but I have never messed with tuning a GM auto, so I have no idea how sophisticated the settings can be.

 

I have two fresh logs in 3rd already, tuner has them as-well. Pretty sure he looked at cells last night and is now thinking its a form of torque management today. He's going to look at things again tonight. I got nothing to do so I kinda am too...

Both logs confirm 2nd is getting full 'high octane' tables and 3rd is hitting the base spark value (5 degrees), reduced power spark value (5 degrees) and minimum final spark for any torque management event (5 degrees).
Sorry not exactly certain what 'cells' mean I'm thinking like tables/ charts.. But yeah nowhere in my High/ low octane spark tables, IAT spark tables, etc does 5 degrees get commanded.. I added all the torque managment channels last night and got a log this morning, there is definetly some activity going on between spark/ trans TM. Not sure what to make of it just yet..

edit: logs confirm third gear flat lines at 5 degrees and currently using a stock 4t45e trans file.... but when I was at the drag strip I swore I saw 8 degrees in 3rd but I was using a fairly aggressive trans file.. interesting

 

Have real timing in 3rd now! 18 degrees

 

What did it end up being? Trans TqMan?

And I bet the car feels SOOOOO much faster now. The difference between 5° to 18° of timing is huge.

 

Well my tuner changed a few things, I kinda chuckled last night reading the file, "saying yeah that should do it lmao".. Turned off 'diff score,' Turned all torque reductions to zero, set the torque management base final spark value to 15 degrees, pretty sure he removed some torque management fields under engine: spark possibly something to do with IAT as-well maybe...

Oh definitely felt a lot faster mohaha! Could tell right away started to lift lol (don't need no speeding tickets lol)