its all on the tune..

 

I'm not tuned yet.

 

than it's possible you're running too lean/rich at different ranges of power. as 350/420 highway is a big gap.

 

Untunned would not be surprised if running way rich at higher throttle.

so what's the best thing to do? I don't want to tune it with just headers? should I put it on dyno to check the graph if it's in danger of blowing the engine or am I OK for now?

 

Untunned would not be surprised if running way rich at higher throttle.

 

Yeah, you damn well should have a wideband gauge in the car, but if you don't get a graph, as long as you are not going below 12 you aren't going to destroy cylinders, just burn a heela lot more fuel, NA, perfect AFR at WOY is 13.5-13.7

 

sorry to sound like a n00b but i'm trying to understand this better...
*he's not going to destroy the cylinders if he doesnt go below 12, meaning the richer he goes the better chance of destroying the cylinders?
*"just burn a hella lot more fuel" ... doesn't it burn more fuel if it goes down for A/F instead of up? i don't know much about tuning but if i remember my high school math.. Air to Fuel ratio, the more fuel added the smaller the ratio ... I.E. 12:1 add more fuel 12:2 which is = to 6:1, so the ratio # has gone down ... unless i'm missing something...? again i'm just trying to learn...

 

I'm getting 30-34 mpg on the interstate with my turboed j35. I'm also running 28" tires so I probably have a little higher final drive ratio.

 

My built J35/J36 engines are getting 40-43MPG........

 

Paul, how is that possible??? Even with a 6spd. Seems crazy high.

 

SIG? I thought you knew better than that.

Always Tune it, regardless of mods. You should have the A/F ratio checked and/or tuned so you don't damage the engine AND to maximize your current mod setup.


I tuned on a Friday after my Top End swap was finished on Wednesday. My travel back from NO.VA. put enough cam break-in miles on the heads, so I was able to Tune just 2 days after the swap.
I''ll need to tune again when I have NVA-AV6 stroke my bottom end.

 

wtf? How is my 3.0 getting 20/24mpg? ugh...time for a bigger motor :angel:

 

Efficency, raising the compression, proper porting, basically extracting all the power avalible from each combustion cycle. Those numbers have been verified independantly by two seperate owners. One driving from here in DC area to Dallas TX (PigPig000 43MPG), and Kschwiggy from here to his parents in Jersey (37-41MPG depending on traffic)

Now, when you put your foot into it, yeah 5MPG......

 

I could vouch. I get about 33-35mpg. Foot on it occasionally mixed street/highway.

 

^It would be higher with tuning/7th gen EMS.

 

Man, I am extremely envious of these mpgs. I am getting 21-23 if I am being good...

 

J32 still pretty good, just bolt ons with CC ~65mph I was able to get 34mpg, should go up with a tune
The J30A1 used to be good but then the mileage just goes down as the car ages a little. I think I was getting 17/23 but new I was able to get low 20's/30mpg.

I would ge better fuel economy then my bros R18 civic

 

^ I think what he is saying is that you'll be burning a lot more fuel at 12:1 than at 13.5-13.7.

 

AFR Air Fuel Ratio

First number is the parts of air by volume, second is the parts of Fuel by volume, so for exapmle 14.7:1 means you have 14.7 times the volume of air vs 1 part fuel, when you go richer you have less air for each part of fuel so at 12:1 you are burning about 20% more fuel than at 14.7:1.

 

so more fuel will destroy the cylinders...?

 

Once you get below about 12:1 there is too much fuel in the charge to burn so it starts pushing past the rings and "washing down" the cylinders removing the oil layer between the cylinder walls and pistons allowing for piston to cylinder wall contact thus wearing the two against each other, I am sure you can figure out from there what a bad thing this is. You can also get it so bad that you thin the oil with gas which will cause bearing failure.

 

had my wideband installed last wk, and fcukkkkkk ! the gauge's going deep sometimes playing from 12-11 on gradual stepping on gas, but when i punch it to wot @ 4500RPM i'm seeing 10's ! The car feel's like chocking... On normal driving (not pass 4500RPM) it's around 16-13... wtf is going on???? should running higher gas octane help? (doubt that) HELP !

 

Fix all those CEL problems and misfires that are unrelated to tuning and then tune the car.

Start messing with that Aeromotive 1:1 FPR you have. Basically just fix and tune up your car

 

The misfires can actually be casued by running so rich and fouling the plugs.

Sig first thing get yourself a NEW denso or NTK primary O2 sensor, I would be real interested to know if there is a Bosch there now since this is exactly what I have seen with using them.

 

Well thats a given, and yeah I know what you mean, thats why I too run NGK or at the very least not Bosch or universals.

 

i'll get some NGK today. also im getting some CAI. whats the best CAI for 3.5 throttle?

demet! i feel like a noobie with those mods!

 

wow i can't believe you are not tuned still. like Paul said, get new 02 sensors, stick with Densos, or NGK. Bosch = European crap that gives improper readings. Also replace teh spark plugs while you are at it. They are probably fouled now. Get Denso IK22, or equivalent NGK.

than you definitely need to go see a tuner.

 

soo busy. still running lean (14.7-16) on low to mid throttle.


I need suggestion on SRI or CAI, which is better for the 3.5?

 

80mm throttle body, minimium 3 inch CAI. short ram only if you are afraid of hydrolock, but CAI is always better. it's been proven over and over on the dyno.

 

are you still supercharged? who built your motar?

i would just got SRI, it aint worth risking hydrolock with the CAI. i speak from experience! plus its louder

 

j35 build

I I was wondering what was a better build for hp j35 or the j32a2 I'm gunnar put a turbo on it and water method eventually It's gunnar be a Sunday driver hw pulls mist the time maybe bring it to the track. So I was wondering Wichita is better and what block you guys using for your high hp builds thank you

 

I I was wondering what was a better build for hp j35 or the j32a2 I'm gunnar put a turbo on it and water method eventually It's gunnar be a Sunday driver hw pulls mist the time maybe bring it to the track. So I was wondering Wichita is better and what block you guys using for your high hp builds thank you

sigh. Bumped a 4 year old thread, and did not read.


Please spend some time reading and then come back.

Thank You.