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Discussion Starter #1
Sorry for the longest delay, I have been at school full time at UTi, now finishing NATT3 (Nissan Advanced Technical Training), then about to graduate, yay! So here is what I have learned so far from car tuning....

1. Upgrading intake, exhaust will cause your engine to pull in and exhaust more air in your engine...remember, your car is nothing more than a vacuum pump working efficiently ;)

2. Engine displacement size (2.0, 2.2) is the amount of air flow that engine can deliver per cylinder, not size of the engine itself.

3. Installing these bolt ons will create more air flow, thus a tune (more of long term fuel trim adjustment is needed to prevent your engine from going too lean) will be needed to get the "claimed" hp and tq these aftermarket companies scream about. Otherwise, your PCM on these cobalts has your long term fuel trim increased above 10% on a duty cycle (running) constantly, remember...your fuel injectors will go to adaptive strategy when needed...a tune will balance it back to 0%, that's all a tune these days really is, fuel trim adjustment on long term with obdII PCM's.

4. If your car has a Mass Air Flow Sensor (not speed density) and 02 sensor, a wideband is required by law for evap emissions control systems. Regardless what people tell you, if it has a MAF and 02, the 02 is wideband, otherwise (i.e. Honda Civics) have a Manifold Absolute Pressure sensor built into the throttle body and 02 to where a narrowband 02 sensor galvanic battery type is required. If you doubt me on this one, research your work, I test you.

5. For basic bolt ons, no need for upgrading your fuel system, unless you have upgraded internals or gone forced induction is required. Your fuel injectors work with the MAF and MAP sensors to self adjust based on environment and altitude outside of the vehicle. Upgrading your CC injectors will do nothing more than embarrass you on a n/a car with OEM internals.

I have more, but I hope this will aide you into your car building/tuning future. I want to make these clear for the average tuner to understand and also the newbies to see the real works. Most technicians at the dealerships are fixing the beginning and "know it alls" mistakes to correct the issue. HOpe this helps you guys/gals learn where the industry is as of now :)

---------- Post added at 04:19 PM ---------- Previous post was at 04:07 PM ----------

*bump* sorry to add this now...Honda Civic (DOHC VTEC) engines have the IAT (intake air temperature sensor) and MAP (manifold absolute pressure sensor) located between the filter to intake manifold, I apologize about that.
 

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And most hondas dont have the IAT sensor attached. tisk tisk**

Welcome back and congrats!
 

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Discussion Starter #3 (Edited)
And most hondas dont have the IAT sensor attached. tisk tisk**

Welcome back and congrats!
yeah, sucks for Honda lol...thanks for mentioning that...our school's last drag race, my cobalt beat a Civic Si with intake, header, exhaust, and hondata tune, he just didn't know his shift points ;)
my balt ran in the 1.8th 10.625, his Si=10.996

I have learned so much about Nissan's, I have lost track on my cobalt :( but Nissan's VVEL system is freakin awesome!
 

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What year? From 2000 to recently those Si's absolutely sucked. I think I was at about 8sec in the 1/8 :)
 

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Discussion Starter #5
What year? From 2000 to recently those Si's absolutely sucked. I think I was at about 8sec in the 1/8 :)
His was the 08 SI coupe, the Intelligent VTEC

Thank you BTW for welcoming back, I felt so bad about how my instructor was claiming my car was DI, when its MPI, :(

---------- Post added at 04:29 PM ---------- Previous post was at 04:26 PM ----------

Look at what issue I ran across using Brad Mabry's header, fixed it now though and running smoother :)
 

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Well it had an exhaust leak coming from the optional sensor I added for UEGO setup...I forgot to tighten that bolt down (18mm is standard for 02 sensors/a.f sensors), works well now, but had that opted for a UEGO AEM air/fuel gauge sensor plug in. Like I said before, works now with no issues :)
 

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2. Engine displacement size (2.0, 2.2) is the amount of air flow that engine can deliver per cylinder, not size of the engine itself.
Not per cylinder but per 4 cylinder. 2.0L engine has .5 litre per cylinder times 4.

Welcome back
 

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Well it had an exhaust leak coming from the optional sensor I added for UEGO setup...I forgot to tighten that bolt down (18mm is standard for 02 sensors/a.f sensors), works well now, but had that opted for a UEGO AEM air/fuel gauge sensor plug in. Like I said before, works now with no issues :)
happened to me too with badmab header forgot to tighten that bad boy down. welcome back
 
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