An old and beaten topic, I know, never the less...

Picked up a used TRD 2nd gen SC- installed it on my truck, and then did some more

1998 4Runner 3.4L 4WD, 5 speed, 171k miles, runs done in 3rd gear. Figures are at the rear wheel, factory 2.4" pulley on the SC.

"bg_4r_baseline_5" = baseline stock
"bg_4r_sc_3" = TRD SC and nothing else
"bg_4r_sc_no_fliter_1" = no panel filter in box. A 6" hole cut in the front of the box duplicates this result
"bg_4r_sc_hiflocat_8" = removed OE CAT, installed a 7" 200 cell bullet CAT (OE ex system)

NO FUEL mods yet, just 92 OCT and IK24 plugs.

I will intsall the URD 7th injector system next week.

 

Is a 4700rpm peak for these typical? Whats the factory red line? I'd like to see a time posted in the 0-60 thread too!

 

Manual transmission should be run in 4th gear, 1to1 ratio. Your using gearing to inflate your numbers.

 

That's actually a bit lower than most I've seen. Toyota even advertises 250 flywheel horse on a bone stock 3.4. It'd help seeing where the op Issa far as altitude. I mean, mine put down 165 up here at altitude n/a.

 

The rated horse power number for the 3.4 was only 180-190hp. I don't remember how much the supercharger was supposed to add.

To the OP, I wouldn't change the way your running on the dyno. Keep with how you did your baseline.

 

Dyno tuning for a 5spd is done in 4th gear. Not 3rd.

 

Hey smartasses, he runs in 3rd because he doesnt have a speed unlimiter installed, he would not be able to oull till redline!

OP -great work! I bought one of those cats for my truck, glad to see what a difference it can make!

 

Numbers are not bad, you can see the top end lean out with how the power lays over on the top end. I would try to stay away from above ~4500rpm until you get the fuel mods. That is where it starts really leaning out in my experience.

 

Hey rocket scientist, I guess it is too difficult to disconnect the speed sensor input. A P0500 will not detune the engine. Keep your smartass in check.

To the OP, did you by chance get your AFR graph? That is a little more difficult due to the catalyst changing readings. Did you install and AFR sensor pre-cat? I need to do that.

 

My NSU sensor died on start up at this session, heater error. I have a new one arriving soon for the dyno, I will re-post numbers once I have the new sensor on the dyno rig.

 

I have not installed a O2 bung upstream of the CAT, yet, but will shortly as I await my Innovate LC-1 to install permanently in the truck.

Some light reading in the meantime RE; pre and post CAT O2 sample:

http://www.dtec.net.au/Lambda%20Test...0Converter.htm

 

I finally got my fuel system installed and went back and did dynos with AFRs.

In this dyno you see PRE fuel system and post fuel system (URD 7th inj). This run is using the as delivered maps from URD. Better- but not perfect:



I decided to make duplicates of the maps and then make my own maps. After about 2 hrs on the dyno this is the result:



I think Im done for now- the truck runs very well and maintains excellent AFRs.

 

Awesome!! Any more info on that cat?? I have a supercharger and am looking to get the most hp out of it.

 

Its a 7" long, 2.5" in/out bullet CAT. Available as a "racing cat" from Random Technology.

 

Thanks, checking it out now!

 

Where did you find one for the 3.4? All I see are ones for the 2.4L and 2.7L Tacomas.

 

I just ordered the "loose" universal 200 cell 7" bullet cat- not application specific. I believe that the ones that are listed as application specific are meant to be an OE replacement.

141-25000- 2-1/2" inlet/outlet on this page: http://www.randomtechnology.com/products.html

I used the 5" diameter body.

 

Great, thanks!

 

No problem! The CAT has been on for about 700 miles and no MILs at all, seems to be within what the ECU expects to "see" as a post CAT O2 reading.

 

Still on the stock pulley? Power is pretty good, too bad it is not a dynojet so it can really be directly compared.

What is your timing? To figure you actual timing you have to read the OBDII timing and then subtract the timing retard from the URD.