im dropping to a 2.8 personally

 

I has a 2.9" ready to go on.. I also have a stage 2, if the 2.9" is to much ill have to go up too.. ..

well, sweet! at least someone is going to do it.. lol. jk, hope all goes well, how much boost are you seeing?

 

Yeah - but you don't have winter.

 

haha! very true.
I'm seeing about 13psi (less than most for some reason) right now, so we'll see what i get with the 2.8

 

The way I understand it, boost is just a measure of restriction. Colder air is more dense and just plain harder to move than warm air. So it essentially acts as a restriction and you see psi increase on your gauge.

The opposite of this is true when any head porting/exhaust work is done. Anytime these mods are done a decrease in boost psi will be seen as there now is less restriction in the system.

 

this is what alot of SS/SC guys should be doing if they dont have the ability to be retuned

I'm thinkin for us it might be necessary considering the AFRs our cars are tuned for as it is...I may consider getting re-tuned in the winter and just sticking with that tune from there on out.

 

I don't know if it is my location or simply because it is the LAP engine, but 16 isn't normal for a 2.9 pulley on the 2.2. You should be getting around 14.

Ha-ha, I agree. I believe 2.8 would make my car go boom!

This is a very good and reasonable explanation, thank you.

I agree. I'll be tuned for a little colder weather. I sent Vince my stuff on Sunday and haven't heard back yet, but if I get tuned now it should be where it is in the middle of summer and winter temps and should be just right.

But if Vince doesn't get back to me for a couple of weeks, lol, then I will be tuned for winter.

That is the problem with him being gone for so long. Now I have to wait until he actually gets back to me. This will be going on waiting 2 weeks now.

 

yes the waiting game sucks, especially when your car doesn't run right...believe me i know.

2 days felt like 2 weeks when i was going through tuning so i can only imagine...

the joys of remote tuning

 

So I send Vince an email this evening telling him I also need to talk to him about an emissions thing on my ECU. He tells me, will be a few more days. LOL. I mean seriously... a few more days since I've waited over 2 weeks now? It is getting to the point where I do not feel like being nice about it any longer. I just said I guess I didn't have a choice in the matter.

Right now, I'm also having an emissions issue. I removed the AIR pump. Ok no big deal. Now I'm trying to get my PA emissions done and it has 5 flags in the ECU that must set before the test can be done. 1 flag is ok to have not run.. and one of those is the air pump. But.. I still have an EVAP flag that won't set... and I have all of my evap stuff hooked up. So until that EVAP flag sets or the air pump flag is gone, I'm fugged.

So my inspection and emissions stickers expired in August and I'm driving a car around with no inspection, emissions or updated tune. WTF.

 

I've got an evap "flag" in my ECU that I haven't figured out yet too. I have the system hooked up properly and think I just have either a bad vent or purge valve. If you are hooked up properly, it can really only be vent valve , purge valve, or gas cap. That is assuming no cracks or splits in the tubing, which I would imagine you wouldnt have with the low miles on your car.

 

Well, I spent a good part of the day trying to figure out my flag with the Tech 2. The Tech 2 states that the test hasn't been run yet. The techs at work said it is a bitch to get it to run within a couple of days and that all you can do is drive it.

I talked to Vince and he said he could probably get a tune from an LAP that doesn't have SAI and then at least the air pump flag would be removed so then I would only have the EVAP flag that didn't run and I could run my emissions test since I can have 1 flag that isn't working yet.

Then... on the way home... I am at the light and it goes into reduced engine power mode and I was like WTF. The car didn't want to run right. I checked the code, P2135, and then cleared it with the Interceptor. Luckily I had the Interceptor or I would have been screwed. It hit again on the freeway on the way home and I cleared it and I was able to continue.

There are 2 modules in the throttle actuator control (throttle body) and 2 modules in the ECU that monitor the throttle position. Each module in the ECU monitors its own voltage from each signal in the throttle body. If there is too much of a variance in the voltage the P2135 code comes up.

There is a bulletin about wiring rubbing against the evap solenoid and causing this code, but my wires there are in tubing and there is no open or damaged wires.

So, it states either wiring, a bad throttle body or bad PCM. For it to be a PCM people say and the GM manual says that you should have other codes to go with it. So it is either wiring or my used LSJ TB.

Hopefully it doesn't rear its ugly head again tomorrow!

 

im betting on the TB, but it doesnt hurt to check the wiring first of course

 

I agree. My new TB arrived today so I'll have to install it tonight and see what happens.

Today was terrible. When I started the car this morning it was acting like it does when the engine power is reduced, but didn't get the code. Then about 2 miles down the road it acted up and I got the code. I cleared the code like 3 or 4 times before it would run ok. It then came on again right as I pulled into work.

On the way home it was worse. I had to clear it probably 20+ times to make it home. I sure hope the TB is finished.

Vince has been back a week and a half from vacation and I still haven't gotten an updated tune. I'm also still driving around with no current inspection or emissions stickers.

Good days for me.

 

Still no tune from Vince even though I paid him for an updated tune. I am starting to think he could care less. He must have bigger fish to fry right now.

I brought the Tech 2 home tonight to look at some data and try and get it to duplicate the condition before I install the TB.

The Tech 2 wouldn't work right so I have to go to work tomorrow to see if it works on anything else.

I'm getting pissed.

 

Ok, good night so far.

Vince sent me an updated tune.

It is getting power enrichment now again and it also seems slightly rich 10.9 to 11.3 at WOT. That is ok for the moment as I only did a 5 mile or so test drive.

Vince also helped me out with the emissions thing. I gave him an exact copy of my car, a VIN without the SAI and he took that as the base tune and then added my custom tune with the 2.5 bar MAP into it.

Now when I log in with the Tech 2 there is no AIR emissions flag, so once I put some miles on it the next couple of days I should have my flags set for getting my inspection and emissions done.

The nice thing about that is no techs will be looking for an AIR pump or anything anymore either. It also probably eliminated all of the AIR related engine codes that could possibly come up.

The only other thing that is a problem is that the non SAI car has a smaller fuel tank (also verified in the service manual) so I had 3/4 tank and after the tune it said I had 1/2 tank.

I mentioned this in my email to Vince thinking he couldn't do anything for me and he said he could take the fuel segment of my tune and add it to the non SAI tune. He sent it back to me a few minutes ago fixed already. I haven't had a chance to load it yet.

I will say, when Vince does get to you, he doesn't screw around, he fixes stuff. I am currently pleased as it also seemed as if my 100 HP that was missing is back.

Since I had the Tech 2 installed looking at the data, I didn't have the Interceptor hooked up to see how much HP I have.

 

Thats good to hear! Glad its working out.

 

Thanks for posting that Gene, reminded me to email Vince about mine, haha.

But glad to hear it's running correctly now!

 

Thanks guys.

Installed the updated tune to fix the fuel gauge last night and my fuel gauge went back to normal.

I didn't drive it to work today since it was like a major flood type of rain outside. I still have to do some data logging and see how much HP I'm supposed to have now.

 

It is still raining out today. I took it out to do some data logging for Vince and I could barely get on it before the tires would spin.

I tried to do some 3rd gear runs but there is too much water on the road so it is unsafe. I did the logs and put her away for today. Tomorrow is supposed to be bright and sunny so I'll try it again.

I am getting some slight popping on decel through the exhaust, like a turbo car. I am running a bit rich... 10.8 to 11.1 at WOT so maybe it has something to do with that.

 

I got a chance to take it out today. I was looking at LT fuel trim and ST fuel trim and they are messed up and high.

I did a 1st through 3rd gear blast and I'm only getting 268HP right now. It is running rich.

I have a P0171 history code that is lean so the ECU is trying to compensate for being lean.

Hopefully Vince can take a look at my issues and fix them lol.

Oh yeah, I am seeing 15+ PSI now, but I haven't been able to pay attention to see if it is 15.5 or 16 as I saw previously.

I did have 285 HP shown before I did the MAP conversion so hopefully I get it back!

 

does it feel slower though? it might just calculate airlow differently now since your IAT2 is actually factored in this time

 

Yes, it doesn't drive anything like it did before I did this, lol. It is jerky... not as responsive, not as much ***** up top.

My fuel trims are messed up I see. LTFT is anywhere from +18 to +29 and STFT has seen as high as +20.

And I did get a CEL tonight for the P0171 so that adds up by looking at my fuel trims.

To setup the tune for the 2.5 bar MAP Vince had to do some estimating of MAP tables so hopefully the next tune is closer.

 

I sent Vince datalogs on Saturday and still haven't heard back. I told him I am having a P0171 lean condition last night. I still didn't hear back from him. Since I keep popping the lean code I am getting the CEL so I can't inspect my car. This is nuts.

 

Have you considered just going back to the tune and set up you had before you had all these issues. I believe it was just the basic stage 2 set up with your map sensor.

 

Yes, but since I paid for an updated tune I should get it. It seems as if Vince wants to be a *****. I've gotten 1 tune update in 4 weeks. **** that ****.