Log of new 680's

[kpt4321]

This thread is a tuning cluster####.

Do you know how to use your fuel trims? If not, let me know and I can explain them to you, and point you to some reading.

You want to just cruise around at 50-60 mph like a ricer, and watch the O2 trim and the hi trim (I like to reset the ECU first). Then use the base knob to get this as close to 0 as you possibly can.

Once that is done, you have set your base properly. Then, you have to use the idle knob to get the low fuel trim to be in the right place when you sit and idle, it'll probably take +15% or maybe even more to get it right.

Then, you can go out and do some WOT tuning, you'll probably need a little bit of fuel at WOT to kill that stupid knock stuff.

Hope this helps.

Get the base straightened out with the trims, and you'll be much closer to being in business.

Also, I bet that big ### idle is due to the car being rich or lean when you start it up. Fuel trims are your friend.

 

[90AWDTalon]

Originally posted by kpt4321
This thread is a tuning cluster####.

Do you know how to use your fuel trims? If not, let me know and I can explain them to you, and point you to some reading.

You want to just cruise around at 50-60 mph like a ricer, and watch the O2 trim and the hi trim (I like to reset the ECU first). Then use the base knob to get this as close to 0 as you possibly can.

Once that is done, you have set your base properly. Then, you have to use the idle knob to get the low fuel trim to be in the right place when you sit and idle, it'll probably take +15% or maybe even more to get it right.

Then, you can go out and do some WOT tuning, you'll probably need a little bit of fuel at WOT to kill that stupid knock stuff.

Hope this helps.

Get the base straightened out with the trims, and you'll be much closer to being in business.

Also, I bet that big ### idle is due to the car being rich or lean when you start it up. Fuel trims are your friend.

Right now my low trim is 118, my car wont go any higher than that, and the 02 trim is cycling from low 100's to high 120's, so its still trying to lean out alittle bit. The high is currently at 96, I need to go for a cruise and see what this will end up at, its been slowly climbing since I leaned the base nob on notch way back on my first day of tunning.

I tried using your method, but I couldn't get the car to run decently on any lower setting than -30%. After going for a 1/2 hour cruise the high trim was in the mid 80's, alittle rich. So I tried -35% again, this time the car ran fine, I didn't go for a cruise after this, I probably should have, but with my short drive to work I saw the high trim slowly leaning out, and the low trim was now pegged at 118 and the o2 trim was pegged at 199. At this setting it ran great in the morning when it was really cold, after work in the afternood it ran like shit, after richening up the idle and mid ran much better. Thats where I'm at now.

Thanks for the reply, I'm going to go for a cruise right now and see where the high trim ends up.

 

[90AWDTalon]

Ok, just got back from my cruise. At the settings I had, the hi trim was staying at 96, the o2 trim was cycling from mid 90's to mid 100's. I pulled over set the base to -40%, hi trim still wouldn't move from 96, o2 trim would cycle in the 70's and 80's for a short period of time then they would cycle in the 130's and 140's for a short period of time, and no matter where I set the idle or mid the car ran like crap.

I think for now I'm going to stick with base: -35%, idle: +5%, mid: +5%, and WOT: 0. At these setting the car has been running ok. When I get a better fpr and can run a better fuel pressure I'll see if I can get it tuned better.

 

[NOSLO2PT0]

O2 trims don't mean squat. My base settings are all at 0, 660's (600cc setting on MAFT), 45psi base fuel pressure, Supra TT pump. I don't care about my low fuel trims. It stays pegged at 118%. Mid and hi both hover around the 106% mark. I still get about 25mpg which aint' bad for a car pushing about 450hp at the crank.

 

[90AWDTalon]

Originally posted by NOSLO2PT0
O2 trims don't mean squat. My base settings are all at 0, 660's (600cc setting on MAFT), 45psi base fuel pressure, Supra TT pump. I don't care about my low fuel trims. It stays pegged at 118%. Mid and hi both hover around the 106% mark. I still get about 25mpg which aint' bad for a car pushing about 450hp at the crank.

o2 trims help in the tuning process, if you watch them you can see what your high, mid, and low trims are trying to do. I'd be really happy to get the trims you have, thats why you get such good gas milage.

Did you mess around with your base timing, or did you leave it where it was at.

 

[NOSLO2PT0]

Read any tuning forum. Nobody uses o2 trims to tune anything. My base timing is still stock, 5 deg. btdc. Turn your base fuel pressure down. seriously. No need to have it at -35%. If the car gets good gas mileage, who cares what the low fuel trim says?

 

[shadrach]

Originally posted by 90AWDTalon
These are PTE injectors by the way.

Be aware that those injectors probably flow more like 640cc/min than 680cc/min:

Read post #89

I have them and I've got my global fuel setting (DSMLink) at -29%, where people with Denso 660s typically are at -31%.

 

[90AWDTalon]

Originally posted by NOSLO2PT0
Read any tuning forum. Nobody uses o2 trims to tune anything. My base timing is still stock, 5 deg. btdc. Turn your base fuel pressure down. seriously. No need to have it at -35%.

I'm not going to turn it down until I get a better afpr, 50psi is the lowest setting that doesn't get overrun by my fuel pump. If I let the fuel pump overrun my fpr it would be even harder to tune.

Originally posted by NOSLO2PT0

If the car gets good gas mileage, who cares what the low fuel trim says?

I'm just saying the reason your getting good gas milage is your alittle lean at idle and cruise, and thats exactly what your fuel trims are saying.

 

[90AWDTalon]

Originally posted by shadrach
Be aware that those injectors probably flow more like 640cc/min than 680cc/min:

Read post #89

I have them and I've got my global fuel setting (DSMLink) at -29%, where people with Denso 660s typically are at -31%.

Average is only 640cc, I wonder what the lowest and highest where? Based on my maft setting's I'd say mine are closer to 600cc. Good to know that they are actually overrated, and its not just my bad tuning. Thanks for the link.

 

[NOSLO2PT0]

Originally posted by 90AWDTalon
I'm not going to turn it down until I get a better afpr, 50psi is the lowest setting that doesn't get overrun by my fuel pump.

Exactly. Dunno why you spent all that money on everything, then keep the biggest POS AFPR out there. Sell that thing and go buy a real regulator, then you can actually tune your car!!

 

[90AWDTalon]

Originally posted by NOSLO2PT0
Exactly. Dunno why you spent all that money on everything, then keep the biggest POS AFPR out there. Sell that thing and go buy a real regulator, then you can actually tune your car!!

Some people like myself are on a real tight budget. I got it because my stock injectors where maxed and I couldn't afford new injectors yet. At the time I bought it there were no bolt on afpr's and I couldn't afford the afpr and all the fittings and lines to install. In my opion it was well worth the $50 I spent, it served its purpose very well untill I made the mistake of installing the downpipe I had had lying around, and even at 60psi my stock injectors were maxed out. I had to cancel an order for a bunch of suspension parts to get these injectors because I was at a point where I had no other opions other than never hitting boost, and thats not going to happen. I do plan on getting a better one, but for now this one will have to do, its not as bad as people make it out to be.

Now that I know for sure these injectors are overrated I'm much more satisfied with my state of tune. The car runs and idle's good, with no knock, not perfectly tuned but definately good enough for now. I was originally skeptical of my tunning when I thought the injectors were suposed to be 680cc and I my setting's were way off from where 680cc's should be.

Thanks for all the replies.

 

[larryriverside]

your most certainly welcolm. i have rapid eye movements. blue 2d 57 chevy hard top 660 psi boost meter. code red: "THE LASER" is dead! this is to all the Wes haters! time to pay for your crimes!

 

[Dieselboy]

Originally posted by 90AWDTalon
I've got a couple of theory's I'm considering. First the injector's rated incorrectly and are closer to 600cc than 680cc.

This is a legitimate theory. Let me guess, you purchased those injectors from Darkside Racing? I did to, and 3 weeks later, I still dont have my injectors. I have heard that the Darkside injectors are all over rated and people have to tune assuming a smaller injector size. No wonder their 680cc's are only $310.

 

[90AWDTalon]

Originally posted by Dieselboy
This is a legitimate theory. Let me guess, you purchased those injectors from Darkside Racing? I did to, and 3 weeks later, I still dont have my injectors. I have heard that the Darkside injectors are all over rated and people have to tune assuming a smaller injector size. No wonder their 680cc's are only $310.

I got mine from www.fullthrottlespeed.com, their shipping was quite fast. They've got some other cool DSM stuff also. I will get there afpr someday. Its not just the darkside injectors being overrated its PTE. If you read the post on the link shadrach left it confirms it.