Loaded

Phone call inbound.........BTW is a MAF swap hard to handle?

IcemanG17

Loaded
MAF swap is very easy......just pull the airbox & bottom piece (two bolts plus possibly a third holding the airpumpline on (most have been removed)....then take a long screwdriver to release the clamp on the bottom of the MAF...it comes right out! 20 minutes tops! I tried it on mine to track down an odd starting problem.... MAF was fine..still looking for other causes

mark kibort

its not a flappy problem either. the curves just miss a hump, but from 3700rpm to redline, would be unaffected.
It looks like you are shifting gears (but i know you are not) on the dyno graph, could it have been a transmission issue , since its an automatic?

mk

Loaded

Tranny is great not a problem remember this only happen at WOT it I pull the throttle back to less then 3/4 it runs like a scalded dog.

The dyno guy was having to gently apply throttle as to no let the tranny shift down when the throttle got to 3/4 it crapped on itself and went hell and a hand basket

Tom. M

To properly run an Auto on the dyno...you need to disconnect the Bowden cable off the intake throttle linkage....upper outside cable on the assembly..and reach under the gas pedal and pull the kickdown switch connector. That way you can manually put the car into 3....and make your run from 2200 or so rpm..without worrying about the kickdown.....

Later,
Tom
89GT

Bill Ball

Every dyno I've had involved disabling the kickdown for AT cars, exactly as Tom mentions. Makes me really wonder about this shop.

FlyingDog

I'd guess it's your chips. When the WOT switch kicks in, your car switches to open loop and runs off of set maps (not full rich as Bill said) in the chips. Bill said in his post above the WOT switch kicks in at around 2/3. Well 2/3 and 3/4 aren't too far apart. You're probably lifting your foot enough to turn off the WOT switch and go back to closed loop. Of course this could also be a MAF issue because in open loop you no longer have the O2 correcting for bad MAF readings.

jakermc

This shop is a race shop. They design, build, and test race cars. I would be willing to bet that these were the first automatics they ever tested. If something had to be done differently for an automatic tranny, they might not have known that. No need to wonder about this shop, they are very good at what they do. They just don't do automatic trannys.

Bill Ball

Fair enough. I was just adding things up after seeing all the strangely low numbers. One low set, bad car, but several low, makes you wonder.

ErnestSw

The bottom line is that they didn't do it correctly.

FlyingDog

Nobody should.

Bill Ball

Heh!

Loaded

AH geeeeee,,,,,,,,make sme wish i had 5 more autos!

ROG100

I disconnected the Kickdown switch on mine.
Did not know or could not remember which cable to disconnect.
Off to the original dyno on Thursday to check my car out and hopefully get a smile back on my face.

Bill Ball

Rog100, it must be that having so many 928s confuses you. Which one should I drive? Jeeze, I thought I had a green one too! Wait, do I have 7 or 8 of them? Problems, problems...

Anyway, the Bowden cable that you want to pop off is the upper outside one on the throttle quadrant. So, just remember: upper, outer.