99SC4Runner

I've got a 99 4Runner 4x4 with a TRD supercharger, URD fuel mods, URD FTC piggyback on it, etc.

I've got a URD 2.2" pulley and a Toyota Supra MAF that I need to install on my 4Runner, but I'm reluctant to do it because it runs pretty good as it is even with 4.11s and 285/75/16 Super Swamper Radials.

My question is this. I want to install the extra addons to give me more power and torque, but what do I need to do as far as fuel maps for the supercharger, and timing?

I've never done the supercharger - fuel map and timing stuff before. I have rebuilt engines, transmissions, and differentials before though. I just need someone to explain it all to me so I can understand the process with adjusting the fuel maps, timing, etc.

I do have the BR-3 OBDII scan tool and a Innovate LM1 wideband meter to use for tuning purposes.

Please if you could teach me how to understand supercharger tuning 101, I'd be forever grateful...

michalik_piotr

sorry i can't help you but that honda quote is hilarious!

Jdizzydub

I'm howling!! Sorry i can't help ya either, but i'm interested in the info you requested.

Elton

you prob gonna need headers and a 2.50'' exhaust to go along with the s/c

99SC4Runner

Well the exhaust is a cat back dual exhaust with 2 1/4" tail pipes setup that has been working great with a Flo-Pro muffler.

Jdizzydub

I thought headers on the 3.4 weren't worth the buck for lil bang it provided??

Elton

on a none s/c engine there not but they seem to help with a s/c

ciscojay

http://www.gadgetonline.com/U-Tune.pdf

you can give Gadget a call if you need help. Look at your exhaust downpipe and check to see if the previous owner had the O2 wideband bung installed so you can tune it.

99SC4Runner

Yep it has the bung for the wideband sensor already installed.

I'll have to give Gadget a call or maybe he'll see my post....

ZukiRunner

Im gonna post and try to help you out just from what i know about turbocharged Nissans and Hondas. Since that has been my thing for the past 10 yrs give or take a few. My dad has taken me wheeling when i was younger so im not new at this either

First off your signature is not funny, it didnt even make me chuckle, It shows your maturity.
It probly doesnt matter to you, but there are 10sec street driven hondas
and IMHO making a 4wheel drive suv or truck faster than most cars is ghey.

Now to the point, you didnt mention if you have a boost gauge but i imagine the stock boost is about 6-7psi, your pulley will probably make it 8-10psi (spark plug gap will likely need to be taken into consideration). the bigger supra maf is most likely going to lean the fuel mixture some. what you want is a air fuel ratio of around (rich)11.5:1-12:1(lean) for boosted motors, closer to 13:1 for n/a motors. your going to use your piggy back to adjust air/fuel throughout the rpm range, its going to take some backroad full throttle tuning(i would use 3rd gear from about 30-40mph or you could put your wheels in the air but i dont recommend it) good thing you have that wideband 02 so you know where your ratio is. i would leave the timing alone and let the ecu make adjustments accordingly. another good thing to have for boosted motors is an EGT gauge.
One thing im wondering about though is the need for a Supra maf. Does anyone here know what the stock 3.4 maf is good for horsepower wise? it looks big enough to handle at least 300+ to wheels. i would actually be surprised if it didnt. besides that, i really doubt a trd s/c'd3.4 is going to put down anything near 300whp. what do the urd fuel mods consist of? how many cc's do the stock injectors flow?


However even after having all these things for tuning,every motor is different and if you dont know what your doing, i suggest spending $100-200 to get a professional dyno tune. personally it would be for my peice of mind. Motors/parts arent cheap.
if you dont mind experimenting a lil on that end, go for it. It seperates mechanics from tuners (i consider myself in between) My roomate tuned his Integra with a piggyback. it runs good to me, but as for my race cars, ill take them to the dyno. i want real numbers.

I hope i could help you out.

Brian

mayfield

I would install the parts, and have it towed to a dyno for tuning by a reputable tuner.

then post your graph cause we all love pretty graphs.

mt_goat

Yeah, read and reread the u-tune write-up, print it out and take the copy with you to reference while tuning.

Also read Speedy's thread:
https://www.yotatech.com/forums/f2/s...thread-111739/

Personally I'd skip the supra MAF, it will make the tuning harder. It was more of a benefit for the people with the older style MAF, they were more restictive than the new style.