[Official] "Do I need a tune with bolt-ons?" thread

[dc3843]

So, I just bought my 2012 370z, and I'm already buying stuff to mod it somewhat. Now, I put an intake on my boss mustang and needed a damn tune for the thing to run right. Do I need that if I put an exhaust on my Z and add an intake later?

[DEpointfive0]

You never NEED a tune, I don't have a tune and my car works fine

[Trips]

Originally Posted by dc3843

So, I just bought my 2012 370z, and I'm already buying stuff to mod it somewhat. Now, I put an intake on my boss mustang and needed a damn tune for the thing to run right. Do I need that if I put an exhaust on my Z and add an intake later?

Only IF you want the optimal performance out of the mods you added.

[gbrettin]

I have a Fast Intentions cat back exhaust system on my car w/o a tune. It's been running this way for the last 3 years just fine.

So you don't NEED to. ... but I'd imagine you would want to once you do CAI and exhaust.

[Baer383]

Here we go again about no tune with mods.

If you haven't checked your car after you modded it then you have NO way of knowing how it is running,and if you can tell just by driving it around then you must have psychic powers or are using the force.

[arnoldas]

i got test pipes, stillens gen 3, no tune, my cpu got used to the mods that my cel light isnt even on anymore

[Baer383]

Originally Posted by arnoldas

i got test pipes, stillens gen 3, no tune, my cpu got used to the mods that my cel light isnt even on anymore

Read my post above

You guys buy 30k+ cars buy all these mods and don't get it checked,sounds like allot of people being cheap,or you guys don't know nothing about cars.

[dc3843]

Baer383, who do you go through for tuning? They use an EPROM or you have an aftermarket ecu? The only experience I have with tuning cars is my 300zx tt and that's 20 years old

[1st]

So just as an fyi for myself. If I run a Stillen cbe, keep the cats and install a Stillen G3 cai with no tune. Will I throw a cell? I know I shouldn’t be due to having the cats and have had other cars with this type of set up(cai/cbe). But I’m reading a lot on the Z getting cells after G3's with only having cbe/cai? and per Stillens web sight the discription says it might throw one. Any insight would help.

[DEpointfive0]

Originally Posted by 1st

So just as an fyi for myself. If I run a Stillen cbe, keep the cats and install a Stillen G3 cai with no tune. Will I throw a cell? I know I shouldn’t be due to having the cats and have had other cars with this type of set up(cai/cbe). But I’m reading a lot on the Z getting cells after G3's with only having cbe/cai? and per Stillens web sight the discription says it might throw one. Any insight would help.

... You shouldn't get a CEL with HFCs, CAIs, and a CBE if your installs went correctly.

[1st]

Originally Posted by DEpointfive0

... You shouldn't get a CEL with HFCs, CAIs, and a CBE if your installs went correctly.

........Really come on now pal. HFC I’m not talking about. I know the HFC will throw a cell unless you have the bung or tune. I’m talking about just CBE/CAI and KEEPING THE CATS. There are threads on this forum that people are stating they are throwing a cell with just 2 breather mods with no vacuum leaks and having the mass air flow sensors cleaned with cleaner. So this is why I’m asking in theory there shouldn’t be a cell thrown. Also I have read a lot of threads stating you didn’t tune. What are your mods?

[Baer383]

Originally Posted by dc3843

Baer383, who do you go through for tuning? They use an EPROM or you have an aftermarket ecu? The only experience I have with tuning cars is my 300zx tt and that's 20 years old

I tuned mine myself using Uprev, I get on everybody about this topic b/c the ECU can only compensate so much 100% is on the money 75% is as far as it can go to remove fuel and 125% is as far as it will go to add fuel,if you do mods and don't get it checked you don't know where you are.
Let say your at 125% at 4500 rpm and don't tune/check it and your ECU get into sees that it still has to add 3% more it can't b/c your maxed out at 125% that's why I tell people to at least go get it checked just to make sure.