Here are some results for today 8/22/07, the first day of tuning for my custom ITB setup. The prototype kit is installed on an NX2000 owned by a friend of mine here in GA.

Here are the basic setup details:

http://www.sr20forum.com/gallery/data/992/thumbs/sr20ve-itbs_023.jpg (http://www.sr20forum.com/gallery/data/992/sr20ve-itbs_023.jpg) http://www.sr20forum.com/gallery/data/992/thumbs/sr20ve-itbs_022.jpg (http://www.sr20forum.com/gallery/data/992/sr20ve-itbs_022.jpg) http://www.sr20forum.com/gallery/data/992/thumbs/S4010265.JPG (http://www.sr20forum.com/gallery/data/992/S4010265.JPG)

These are earlier pics. se-r maf swapped to N60. Injectors are grey 333cc injectors

Day 1

Step 1 Tuning

Motor: internal stock SR20VE
Exhaust: 2.5" cat back
Flywheel/ Transmission: Stock B13 SE-R
Clutch: Spec stage III
VVL Intake solenoid: OFF (unplugged)
VVL Exhaust solenoid: OFF
Timing: 15* BTDC (conservative for now)
Cams: Stock
Injectors: 333cc
MAF: N60
Intake manifold: Custom 45mm ITBS (see pic)
ECU: stock b13 with daughterboard and custom map
Fuel pump: Stock
FPR: none
FP gauge: none

I basically wanted to use today to check A/F ratios and run without the VVL activation. Air fuel ratios were basically flat but dangerously in the 15.5-16.2 range from 2500-6500 no matter what I did to the fuel map and very choppy (kinda like a sine wave with a peak at ~16 and a low at ~14.5 ). Part throttle AFRs were perfect in the 13.5 to14.2 range. So my conclusion is a blockage in the fuel flow. The fuel map on the daughterboard is definitely being read. To test this I set the rev limiter to 3600rpm, drove the car and the revs will not past 3600rpm.

Day 2 to be con'td

I will have a bigger fuel pump, all new filters, check fuel lines, install a FP gauge and FPR.

Current Numbers:

http://www.sr20forum.com/gallery/data/1116/thumbs/nx2000-itb-rev0.jpg (http://www.sr20forum.com/gallery/data/1116/nx2000-itb-rev0.jpg)


More tuning to come...

so what are you tuning with? you say your runing a map, but then why do you have the n60?

ok now that you edited i see.

so what are you tuning with? you say your runing a map, but then why do you have the n60?

ok now that you edited i see.

:biggthump

did u flow bench that plenum, and why have u not activated the vvl

Did you do a baseline run before installing the ITB?

did u flow bench that plenum, and why have u not activated the vvl

We're going to fix the fuel problem first before the higher lift cam lobes allow more air into the motor and really send A/F ratios higher. Just a safety measure for now.

Did you do a baseline run before installing the ITB?

The ITBs were already installed and we didnt have time to swap over to the oem manifold. This is in our plans, it just wasnt possible today. We got to the dyno later than originally planned.

We have the oem manifold, fuel maps..etc, etc....so the baseline runs will be done, hopefully 2morrow.

The car was sluggish before the ITBs were swapped in. So I'm confident there was a fuel starvation problem that already existed.

Good luck with the tuning. I think you should check for air leaks since the ITB has a lot of vacuum ports. The air leaks are the mostly likely reason your are running lean.

injectors are realyyy toooo small. I think your inj load is close to 100% and it is one of the reason of BAD fuel mixture quality. Example: Greddy advises to change injs if the load reaches 80%. you need min 370cc and I advice you use FPR (@4psi).

P.S. Nice KIT! I want one tooo!!!

Good luck with the tuning. I think you should check for air leaks since the ITB has a lot of vacuum ports. The air leaks are the mostly likely reason your are running lean.

Nope, no air leaks. When I first installed the ITBs the car idled at 400rpm, without stalling. I checked it anyway and there are definitely no leaks.

I added a TREMENDOUS amount of fuel to the fuel map and the only thing that changed was the part throttle and initial WOT at 2000rpm at the start of the dyno pull. From there the A/F ratios went up, the down, then up, then down like a perfect sine wave. I'll have a FP gauge to verify pressure when we continue on...

injectors are realyyy toooo small. I think your inj load is close to 100% and it is one of the reason of BAD fuel mixture quality. Example: Greddy advises to change injs if the load reaches 80%. you need min 370cc and I advice you use FPR (@4psi).

P.S. Nice KIT! I want one tooo!!!

Yep, that's what I am thinking. We have a FPR we're going to add and I'll run it at 4bar. Still, at 2500 rpm the A/F ratio was 15.5 I'd expect the injectors sizing being too small to show up at the end of the pull, not the beginning...

On my Stock VZ-R i have monitored my quater runs with the greddy e-manage logger and found out that the inj load was 68% on stock sr16ve 175ps 333cc at 7800.
Your theoretical air consumption now ~200ps ... with the same inj...
So, if youre not going to kill your engine buy a knock monitor (or use headphones with your ecu) and change inj and calibrate the maps before...

looking forward to the numbers once its all tuned/settled:)

You need more fuel in the throttle enrichment map due to the extra throttle response at WOT. Part throttle and the stock fuel maps will be fine. Not sure if your 'chip' can modify that TE map though.

retard the timing to 14*

check air fuel

an rev to 7800
also dont over do it on the fuel psi

how are u tuning the maps? real time? or s-afc?

On my Stock VZ-R i have monitored my quater runs with the greddy e-manage logger and found out that the inj load was 68% on stock sr16ve 175ps 333cc at 7800.
Your theoretical air consumption now ~200ps ... with the same inj...
So, if youre not going to kill your engine buy a knock monitor (or use headphones with your ecu) and change inj and calibrate the maps before...

370's it is...:biggthump. I have 4 purps here but I can only find one. For now I'll run a higher FP @ 4 bar until I can find the other 3 that are here hiding in my garage.

You need more fuel in the throttle enrichment map due to the extra throttle response at WOT. Part throttle and the stock throttle enrichment will be fine. Not sure if your 'chip' can modify that TE map though.

Do you know the base address/ range for the TE table? I can modify it once I know the address...

retard the timing to 14*

check air fuel

an rev to 7800
also dont over do it on the fuel psi

how are u tuning the maps? real time? or s-afc?

Will do. Tuning is being done via romulator.

I'm impressed with your work! Top notch stuff there. What throttlebodies did you use? I'm thinking more and more about going this route but at the moment I'm pretty limited to GTiR throttlebodies and not much else (without spending mega-bux anyway). Once something relatively cheap and easy comes along I'll jump on it!

the 132 with the VVL off isn't bad at all. Ivan hit 141 with the low lobes on the Franklin Stage 4's.
http://i137.photobucket.com/albums/q211/Bluerb240/vvloffivan.jpg

good lick with this i would love to see more of these out there, what is the total cost for a one (complete)