JFR Equal Length Y-Pipe for 2nd Gen Tacoma, T4R, & FJ Cruisers

Hmmm good to know.. maybe its just the injectors then. Only time will tell I suppose

 

Noticed today while on lunch and idling, that if i turn the AC on, it idles a little better. This leads me to believe it is indeed the bigger injectors causing the rough idle. Smoothed out some and once i turned the AC off, it came back immediately. Probably nothing to worry about, but im OCD and over-analyze everything in case there are any problems

 

One thing I've thought of is if the injectors aren't flow matched, which the 61lb injectors from URD aren't, it's possible some injectors are flowing more than nominal and some less. So at very low injector pulse widths (no load idle) each cylinder could potentially be slightly rich or lean. This could cause the slight idle roughness.

When you turn on ac and increase the idle load the IPW increases which may stabilize the idle mixture.

Did you or @loginfailed check the intercooler lid oring? I know they have a tendency to split which could cause an induction leak.

 

I saw login put the new one on that rjb brought to the party.

 

That makes sense to me, kinda my thoughts on how it worked as well since once you add a little bit of load with the AC, it stabilized a little more.

I did not replace the o-ring on the intercooler. we did replace the orange foam seal like @elnip mentioned, but not the o-ring between the intercooler housing and the blower body

 

Wouldn't the IPW decrease as it would be trying to richen things up ever so slightly because of the increased load?

I always thought that as IPW increased, things ran leaner, and as IPW decreased things ran richer. At least that's how it makes sense in my mind. If I have this backwards, please correct me..

 

Oops, my bad. Should have read more carefully....

 

All good man!

 

The two most common means of measuring injectors ON/OFF time is injector pulse width (IPW) and injector duty cycle (IDC). Injector pulse width is the time in milliseconds that the injector is open and injector duty cycle is a % of time the injector is open in a complete 4 stroke cycle.
In both cases a larger number means more fuel is being used because they both represent the amount of ON time of the injector.
So if you are at a no load idle and turn the ac on, both the IPW and the IDC will increase as they are both a measurement of ON time.

 

Ahhhh, gotcha i had it completely backwards then. I thought IPW measured the time they were off. That's much clearer now, thank you sir!

 

No prob. Here is a chart for a visual reference.

 

Any idea if this would be beneficial on a Manual Trans? I am thinking about adding this to mine if it will accept it (I think the trans housing might be finned to help dissipate heat, so it may not accept it, ill have to check)

 

Very good chart, saving for future reference

 

If I remember correctly you have plenty of clearance to the y-pipe so I wouldnt worry about it.
Auto trans pans are about 1" away from the pan which is why I recommend it.

 

Yes i do have a bit more clearance. Here is a picture.. The only reason i've been considering it is because the crossover of the ypipe is right below where all the trans fluid is, so im thinking it may be heating that up a bit more than the stock ypipe. Might add some just for good measure. Did you buy your heat shield online?

 

Trans cooler would be a worthy invest. Though pricey. You would need a pump, lines, fittings, mount, and cooler. Plus tap your trans for those lines. Could always also get a t56. Or get heavy shock proof fluid.

 

Would be a worthy upgrade like you said for sure. Id go t56 but i really like having 4wd..

Do you have any recommendations for a heavy shock proof fluid?

Ive been considering running something like lucas 85w-140 in the tranny as it specifies its gl4 or gl5 compatible, but there is other stuff in it like lsd additive and im not sure how that would do in the trans. Seems like i need a heaver fluid than the stock

$29 75w-90 Synthetic Gear Lube - 1 Quart (Pack of 2)

75w-90 though

 

Redline

 

Yup agree^^^ Redline MT90 is the best for our MTs

 

Ive run redline mt90 for 10-15k and it always started breaking down to the point where the trans would grind after 3k miles and i would have to change it. I think i might need a heavier weight oil. Im running nissan 75w-85 MTF right now and that seems to be even better than the redline mt90 (and i was pleased with how the redline shifted for the first 2500 miles after a change). Starting to look for other alternatives though