Ultra Vip

Ok guys,

I did a search and saw GS Fonzy's thread about this install but Im still confused.

I hard wired my neo in using JeffTsai's ecu pinout values and the T10-e diagram in the install manual.



the only thing i saw different with the two was the tps signal wire. so after i rewired that mix up. i thought i was golden.

problem is now when the car is running the rpms on the tach vs the rpms on the neo vary alot.

rpm on neo is usually half of the rpms on the tach.

what did i do wrong?????

i have it set up for

8 cylinders throttle ^

hotwire 1 in 1 out single in single out

rev 8000 (since you can only choose 6000 or 8000)

sensor readings are at ignition on:

IG 11.12v
In1 .48 v
In2 .01 v
Thr .60 v
Out .48 v

sorry if this has been discussed before i used search and couldnt find any help.

any help would be greatly appreciated.

Ultra Vip

come on guys 17 views an on one has any ideas?

Rock-a-Lex

iTrader: (4)

If I can find my pin-out sheet that I used (from my local public library; official Lexus documentation) I will post it up for you. I did not hardwire mine in at all; I left the guess work out and sent the manual from the Apexi Neo and the pin-out sheets to Boomslang and 2 weeks later came my custom PnP harness. Worked fine for me. I'll try to help all I can if I can find them.

Ultra Vip

yeah i read your install thread and want to put it in the same location as you did. i just didnt have the money for PnP harness right now.

thought i had all the right pin-outs. the neo is on and its getting the right signals to it. its just the rpms are off.

did i set it up right?

what sensor settings are you using? hotwire or pressure?

how many sensors in and out?

i have them set at 1 each.

thanks for the help.

GILLEXUS

iTrader: (14)

Another post on the wiring they look the same.

https://www.clublexus.com/forums/per...r-gs-400s.html


How off is your tach? If car tach is at 2,000 what is the NEO rpm reading

Since you have Hot wire -13 From the manual. I believe your in/out number is 13 (the sensor #) in13/out13

Ultra Vip

its off by half constantly. so at 2000 on the tach the neo is at 1000. if im at 3000 its at 1500. etc etc.

ill try the 13 in and 13 out setting on the hot wire and let you know what happens

thanks

Rock-a-Lex

iTrader: (4)

hmm...well, I didn't do any of the tuing myself so all that sounds foreign to me but I have messed around in the settings area of the Neo and it sounds to me like there is an issue with an interval setting; since your getting exactly half of the actual RPMs.

I DO REMEMBER one KEY thing though...I remember when the guy was dyno tuning my car he said that the Neo did NOT have a setting (input) for 8 cylinder engines so he mentioned he had to use the 4 cylinder setting and double it somehow for the Neo to respond correctly. Sorry such a broad statement but like I said before I don't know anything about tuning. GL man!

Ultra Vip

ok I think I figured it out from what you said rock.

I put the engine to a 4 cylinder

Hotwire in 2 out 2

Rpms are pretty much the same now.

Can you do me a favor an go to your etc menu and check if yours is the same?

It shouldn't change any of your tune settings if you don't press any of the arrows. Just use the far right down to select engine and far right up to cancel out of the menu.

Same thing for sensor hotwire.

Thanks.

Rising_Sun

iTrader: (2)

Well looking at both diagram pictures the above diagram shows the RPM signal located on the E2-27 pin. The T10e shows the RPM pin as E5-16. Have you tried wiring both pins to see which gives you the proper output?

denut-L

iTrader: (11)

Hey ultra vip maybe you should do a diy afc neo, so when i get mines i can just follow yours.

Ultra Vip

Thanks for pointing that out rising_sun. I didn't notice that the s-afc t10e diagram points out a different rpm signal wire.

The neo install manual doesn't have the gs400 in it the closest was a 1uzfe celsior and that t10-e diagram was exactly the same as jefftsai diagram except for the tach signal. So when I get home from work I may try it, unless my conclusion of how its setup now is right.

Denut just pm me when you get yours and I'll help you with any problems you run in to if I can get mine figured out first that is. LOL

Rock-a-Lex

iTrader: (4)

Great! I'm glad that did the trick. I wish I could help you more but my Neo is temporarily out of commission due to my stupidity.lol

The DAY I got my headers installed I was messing around with the Neo while parked; just looking at the settings and instead of exiting out, I hit something and the car instantly turned off and would not start again! To add insult to injury I was on line at the car wash with 10 cars in front and 10 cars behind me. Yeah, talk about embarassing, I had to break out the tools (luckily I had my Lexus tool kit), put my hazards on and disconnect my harness from my ECU, then plugged everything back in stock form. Started her back up with no problems but I definitely screwed something up with the pre-header tune I had.

So needless to say it is disconnected and I made an appointment this weekend at the local dyno shop for a re-connect and re-tune - post headers.

Ultra Vip

thats sucks! but at least you had your tools and the PnP harness to quickly return the car to stock.

Can you please write down what setting you have in the ETC section when you go to the dyno this weekend?

Ill just need to verify its

4 cylinder ^ throttle

hotwire 2 in 2 out single single

that way i know im at the right start point when i put mine on the dyno. dont want to blow up. lol

no one knows how to use a neo around here so ill be doing my own tuning on the local dyno.

GILLEXUS

iTrader: (14)

Did you try the 13 in/13/out. I did the wiring for my GS430 and found out comparing SRT's ECU wiring ( since I know there's work)and Apex's wiring, Apex uses the RPM signal coming from the ignition wire and SRT uses the RPM signal going to the RPM gauge. I just checked JeffTsai's RPM wire location and it is the same location as in the SRT's ECU's.
I tried both connections on mine and and did not see any noticeable difference. So I went with the Apex's RPM signal wire I just think it is a better choice.

Ultra Vip

i tried 8 cylinder up throttle hotwire 13 in 13 out single single but it didnt change anything. =(

i had to do 4 cylinder up throttle hotwire 2 in 2 out single singleand that made the rpms run the same.

i dont thinking the # in # is actually the sensor number of the car but the multiplyer.

so the way our ecu works it runs each side of the V-8 seperately. so in essence 2 x 4 cylinder engines. thats why it runs a 4 cylinder motor and you have 2 in 2 out single single to multiply that reading twice and it gives you total rpms for the engine. sounds weird but it works.