Got a wideband, now I know the car is crazy rich.

[Scott Y]

Erron welded the O2 bung on for me, and forced me to weld some scrap metal together while we were waiting for it to cool down. Damn him for passing on the blue light addition!! I never welded before, and I thought it was a very neat thing. I can think of about 484 things around the house that I think should be welded now.

On the first WOT pass the wb didn't even bother to count down to 10.0, it just went -rich-. Made sense to me, I knew the car was being given too much fuel.

I leaned the MAFT WOT knob a click or two, and immediately the car started knocking. I played around a bit but couldn't get away from knock. Then a guy on another board suggested turning the fuel pressure down (it was at 37 w/vacuum disconnected) so I tried it. It woke the car up a little bit and the countdown to -rich went a little slower. The knock was not really any worse, and I haven't turned the fuel pressure down very much. I won't spend much more time tuning on the current setup, because......

a little present arrived in the garage today, in the form of DSMLink. I'm going to install it and have another go at this tuning thing, with much more granular control than the MAFT. As soon as I'm registered on their forum I'll do my best sponge impersonation and try and soak up as much knowledge as I can.

[BlueVelocity]

I've found that a lot of times on older cars that have a bit of carbon built up on the pistons and valves, the only way to reduce knock on standard octane 91 is to be on the high side of A/F. Might want to try the Mopar Combustion Chamber Cleaner trick and see if that helps.

Erron S.

[rlarsen]

Once you get DSMLink installed, zero out the MAFT and start your tuning all over again, if things don't improve dramatically, you'll at least have much more information to report that will allow us to help you figure out what's wrong.

I agree with Erron, too, if you have a lot of miles on the motor and haven't done the MCCC business lately.

[dsm_gsx97]

And on a side note, I'd put your base fuel pressure back to what the stock is for your car when using DSMLink. 38psi on 1G and 43psi on a 2G. With DSMLink you should be able to tune that knock out of there without messing with the fuel pressure.

[Scott Y]

I've attached the PLX 5V output to pin 16 (Baro) and clamped the input, so I can see the PLX output in the logs. The value on Link and the PLX display look to be the same.

I've only been able to drive the car to work and back and haven't been able to spend any time tuning. My head is about ready to explode from crusing the DSMLink forum, wow is there a lot of information out there. As I learn more I'll be able to separate the good from the bad and it'll make more sense.

The car runs ok, it goes rich at the drop of a hat. I do see knock, I can get up to 5 deg of retard just going WOT at a standstill in neutral; I'm due for an oil change, and the lifters (3G) start making noise when the oil gets as dark like it is now. My fuel pressure is unknown; I have an electric gauge, but it does weird things. When I adjust the afpr the gauge doesn't smoothly react and change its reading as I adjust the fuel pressure. The gauge doesn't move, and then suddently jumps from 30 to 36, or from 41 to 32 if I'm adjusting pressure the other way. I had a b&m directly on the afpr years ago and it reacted smoothly as I remember. I had it at 37, and the Inteltronics(sp?) digital gauge that I currently have measured differently, it measured about 8 lower. So, I've got it set to 30 on the gauge using DSMLink to run the fuel pump with the car not running. I need to find a more suitable affordable gauge.

The car runs much smoother than it did before, and even though it's not tuned correctly it will run to redline if I want it to. Previously it would break up and stumble on its way to 6500 or so. I'll do an oil change, possibly some MCCC before that, before the dyno session at 9SR this weekend. I'm scheduled for Sunday, so on Sat hopefully I can find some time to pull some fuel out and see if I can keep get the a/f to lower than 10.1:1.

I'm not worried about blowing the car up when it's this rich, and I'll at least get a baseline this weekend and strive to make some significant improvements while I learn to tune.

Thanks for your input, I may come hollering for some help if I can't make reasonable headway.

Scott Y

[dsm_gsx97]

My head is about ready to explode from crusing the DSMLink forum, wow is there a lot of information out there. As I learn more I'll be able to separate the good from the bad and it'll make more sense.

This is good to do, but mainly just pay attention to the DSMLink manual for now. IMO, it answers most of everything you need to know besides specifics and like you said at this point those are little to much and probably got you over thinking. I'll be at the dyno days so I can look at your logs if you'd like me to and tell you what I see going on.

Best advice is to clear up the "little" issues you have going on and then start to tune your injectors to make sure the deadtime is correct with the global. Having this not dialed in correctly will give you poor results when going WOT tuning. The WOT should go quickly once you have the kinks worked out.

[dsm_gsx97]

I apologize for not being there this weekend. My TPS sensor didn't come in so I fixed the last few things up on the car and helped the wife with the kids so she didn't go crazy.

Did you get some good tuning done on the dyno (or before)? Would you like to email me any logs to look at right now or answer any questions about things?

[90GSXrikplin]

:eek: