Any downside to 3.5" intake?

[MrShark]

I plan to get a JBR WP intake down the road and wondering if there is any downside to a 3.5" intake on a stock turbo? I don't see how getting air too easily can be an issue, and I can make my own 51R battery tray at work. Thanks for any input.

[manila]

There's no real downside. If anything, the pros outweigh the cons.
More airflow and smoother driveabilty. More power!

[maisonvi]

only "con" I see are the need to move the ECU. Which really isnt a problem.

[Nitr0EngiE]

3.5" on stock turbo is completely pointless in my opinion unless your gonna go big turbo later, its a real pain in the ass to tune.

[maisonvi]

Originally Posted by Nitr0EngiE 3.5" on stock turbo is completely pointless in my opinion unless your gonna go big turbo later, its a real pain in the ass to tune.

Im running it now on the stock turbo. Im only running a modified Cobb map though.

[breakfstincluded]

Originally Posted by Nitr0EngiE 3.5" on stock turbo is completely pointless in my opinion unless your gonna go big turbo later, its a real pain in the ass to tune.

how about a nice 3" lol

[anavrinIV]

when it's cold outside the car gets about one big bog on cold starts. I'll go to shift to second (gently) and the car bucks and nearly stops. After that it's fine, no issues. Mine has been dialed in for nearly 10k miles with a 5% fuel trip at one breakpoint, the rest are within 2%. Ambient fluctuations can change LTFTs anyway so with 8k+ miles on this calibration I'll say it's doing pretty well.

[Nitr0EngiE]

a 3" would be fine, 3.5 is alot of extra headache for a stock turbo you can overly outflow on a 3"

[MrShark]

Originally Posted by anavrinIV when it's cold outside the car gets about one big bog on cold starts. I'll go to shift to second (gently) and the car bucks and nearly stops. After that it's fine, no issues.

I already get exactly what you describe when cold with just the CS setup. Not as extreme as nearly stopping but feels like I dropped the clutch.

I just figured if I go BNR down the road it's already got the best benefit of intake out there with the OE inlet or go GT with a new intake if money is there when the time comes.

[MazdaBoy2.3]

Originally Posted by MrShark I already get exactly what you describe when cold with just the CS setup. Not as extreme as nearly stopping but feels like I dropped the clutch. I just figured if I go BNR down the road it's already got the best benefit of intake out there with the OE inlet or go GT with a new intake if money is there when the time comes.

Jeremy, I think we should run a compression test on your car before BT. I'm thinking you could go for a valve cleaning at the very least!

:-)

[racingred]

Save all the headache and go with a 3" or you can do what I did and just remove the intake and TIP all together

[Nitr0EngiE]

if your gonna go BT wait till you do the BT to go 3.5 until then stay stock to save money, if not going BT just get a 3"

[Lex]

Some of the driveability issues crop up around the 4" MAF housing size.

[MrShark]

Originally Posted by MazdaBoy2.3 Jeremy, I think we should run a compression test on your car before BT. I'm thinking you could go for a valve cleaning at the very least!

Unless I ZZB I probably wouldn't go BT for at least a year or two. But I could definitely use a valve cleaning if you've got the technique down. I've read the vacuum and media gun method a few times but still seems iffy.

I just hate the huge lip in the transfer from MAF tube to TIP on the CS intake, can't be helping.

Lex is the one who got me thinking about the big intakes before I go for proper tuning. Already got the IC.

[Ezekiel81923]

I have on of the original wrinkle finish JBR WidePath 3.5" intakes from the group buy he ran ooooh about a year or year and a half ago and I was still planning on using it.

I would think if the MAF is calibrated correctly it shouldn't be an issue. Unless the MAF cal is the problem.

[El_Diablo]

I'm running an HTP 3.5" w/ the MAF screen. Tuning only took 2 tries to get the MAF call right (started at the base cal from @Lex; ) and I haven't had any hesitation or bogging down into the high 30's low 40's temps. Picked up over 20 g's from my 2.75" intake with just the parts listed in my sig. I still need a higher flowing intercooler to really take advantage of the intake.