hoping to drive the car for the long weekend...but...

having a problem with the PB on the vitesse set up, so john said to use the image #1(generic setting) for now(non v-flex image).

problem is....when i adjust the idle, which takes alot of adjustments with the TPS, throttle hard stop, and the idle screw on the top of the throttle body, AFRs are a bit lean(high 15s- 17s), but the top end( half throttle and 3/4 throttle) is rich(high 13s).

when i get the top end set almost properly, the idle and low end throttle are are really lean and it wants to cut out or stall.

should i adjust the FQS setting....or park it for the weekend?

thanks for any help,

adam

 

I don't know specific's but on some piggy backs you need to disconnect the stock 02 in order to make certain adjustments. Maybe that's what your running into?

 

Did yo tell John what happens when you do this? He'll probably be able to help you better than anyone else since he already knows what's going on with your car.

 

I hope under boost you are a lot richer than 13 or the motor is going to be toast....

 

How are you adjusting the AFR? The piggyback lets you adjust it for each rpm level if needed. So if you adjust the low rpm AFR, it will have no impact on the high rpm AFR. More importantly, if your car is lean on idle and overly rich on boost, it suggest a vacuum leak. However, on WOT, your car should be at 12.5 or lower, so 13 is actually leaner than you want. Probably need to chat with John to understand the system and get it dialed in.

 

rich on top????? 13's, you need someone to help you tune.

Idle is okay 14.7-15.1, top imho should never exceed 11:7.

 

top??? Do you mean WOT? 11:7 sounds good to me, mine was pig rich 10:5.AFPR
issue. Got it fixed though.

 

As mentioned, if you're under boost, AFR of 13's isn't rich, it's lean. How are you measuring your AFR? Wide band O2? You should be shooting for stoich at idle and cruise, you should see your AFR's bouncing from 14-15 at that point. Under boost your AFR's should be dropping to 11.8 or so...

 

thanks guys,

by top end.....i mean just cruising no turbo....actually the turbo spooled up once to 4-5psi...but really its just cruising 1/2 throttle its to rich. no turbo at 3500rpm is in the high 13s.

im going to try playing with the PB....very little understanding how to use it....john is going to help me when he gets back from a trip.

i was hoping there was something else i could adjust (not PB) to get the AFRs right......the reason is when it was set on the race mode last time the AFRs were perfect....no PB cause race mode takes the PB out of the equation. but again the idle and AFRs were dead on(until the motor blew!).

i think i will just park it until john gets back.

again, thanks guys for the ideas and help,

adam

 

Not sure what you mean by this? If you select the race gas maps, the piggyback still functions the same.

Have you set the idle per clarks garage? Not sure what you were up to with the hard stops, etc.

You can make other changes that affect AFR's but that's not a good idea. You either need to add small adjustments to the PB or figure out why the the AFR's are further off -- leaks, bad grounds, etc. What happens when you use the shorting plug in place of the piggyback?

 

sorry...couldnt get to the computer,

when the shop put the car together last time, it ran perfectly. Afrs were great, idled great, boosted great....but they left it in race gas mode and the wrong image on the chip. 2100 miles later, it detonated!
thats when i found out about the wrong settings.

race gas mode(shorting plug), thats what i meant to say. made no difference.

i set the idle per clarks garage and lindsey racing tech section.

im thinking its either the wiring to the PB, or a vacuum leak....cleaned the grounds really well before installing them. also i already checked the vacuum hoses, but im going to check again more thoroughly.

adam