johntorg

Can anyone tell me if Version 7 Guru 18lb chips use the same FQS switch settings as Version 8 and later? I have been unable to keep the V7 chip setup from Running too rich with with 18 lbs of boost and 52lb injectors. I have tried lowering the fuel pressure, but that screws up the idle. I am using an ARC-2 and a MAF.

johntorg

I'm planning on going to the Drag Strip tomorrow for some serious tuning and logging and would like an answer today if possible.

Thanks in advance for your help.

david fracolli

Yes, the version 7 chips use the same FQS setting as the later versions.
Good luck trying to get these chips to work with a MAF and 52 LB injectors. I tried for alsmost 3 weeks to set my A/F ratio with a mafterburner and finally gave up.
When i first installed the chips with the afm the car would start fine when cold but would refuse to start when hot. After I hooked my wideband I found that the A/F ratio above 4200 RPM's was running 9.8/1!
The only way I could get the car to start when warm and to get the proper A/F ratio above 4200 rpm's was to set the FQS switch to the stock injector size and then scale back the fuel 30% with the Mafterburner.
I never was able to get the car to run with the FQS set for 52LB injectors with the MAF. All I can say is good luck trying to tune it with just the ARC2!

toddk911

You could probably get Danno to send you the V9 chips.

I have the GURU 18 and MAF/ARC bigger injectors and runs fine. Still fine tuning but starts and runs fine.

I have heard others with Mafterburner having problems with other chips as well.

toddk911

" After I hooked my wideband I found that the A/F ratio above 4200 RPM's was running 9.8/1!"

Because you are running on the stock injector FQS instead ofd the 52lb setting.

Also, although some in here will disagree, the stock injectors, and thus bigger injectors, are capable of a lot more flow then people think.

david fracolli

Reread my post! The AFR was 9.8 running 52lb injectors with the FQS setting at posistion 2 which is for 52 pound injectors.

johntorg

Thanks, I'm running AFR around 10 with the switch set for stock injectors. This is Jimbo's old car and he couldn't get it to run well any other way. Actually running closed loop its has pretty good driveability and idle. But as soon as I get on it, it goes very rich. The Wideband (tech edge) 02 sensor is located in the crossover pipe along side the stock 02 sensor. I am told this gives false rich readings. I am going to use an LM-1 in the tail pipe to compare.

Todd. can you tell me what ARC2 setting you have on your car with switch set to 52lb injectors?

jimbo1111

My guess is high 12's in the 1/4 with 19psi. BTW: the Techedge is worthless in it's present location.

toddk911

What is the best location for the wideband O2?

Mine is about where cat would be.

John, mine are going to be different as I have 42lb injectors. but I have on the sotck FQS.

I was told it is easier to tune like that. Also better to be rich and pull back then vice versa.

LOW: 4 clicks left of zero
MID: 2 clicks left of zero (still rich)
HIGH: 2 clicks right of zero (about 11:1)
ACCEL: 1 click right of center.

Although I have not done tests to see how much difference only adjusting the ACCEL does.

johntorg

Thanks again, I'm going to plug the existing location and relocate it rearward. I just finished rewiring the tech edge connector so I can log RPM and 2 other analog signals. I am using a logger called TEWLOG. I am going to be traveling for the next three weeks but before I move it I'm going to run a comparison with an LM-1 to see how close they are.

johntorg

BTW Drag racing was cancelled due to thunderstorms. Oh well, another day.