Darien

I can't remember. The tree is now fed off the brake boost line.

Jack '84 928s

Ignition timing miss on a dyno can make you have 900tq i have seen this, if it was an igniton miss your tq would be way off. It could be something like in my buddys wrx on the dyno when we turned the boost down it made like 20hp more due to the intercooler being to small and the turbo almost off of its map.

Darien

I changed the vacuum source to the EZK from the brake boost to one of the ports on the throttle body. I took her for a spin and no change It'll redline very quick while in first and second, when put in 3rd, it gradually builds speed

Fastest928

cam timing

Darien

Marc, I'm hoping that's not the case Just looking at others with the same set-up and having better results. Although, the PO had the engine top half rebuilt (timing belt?) back in 1991 ($5,325)??

FlyingDog

I don't see why cam timing would make a difference between 1st/2nd vs 3rd. Darien, cam timing is adjustable on 32V cars. See if you can find one of Porken's 32V timing tools and get the timing set.

Do you have the low octane retard loop connected?

Tony

Can timing..hmm. Well we have all sorts of things to look at now!
pulls great in 1st and 2nd.
Most people seem to find them off just a little bit due to belt stretch etc but would it make THAT drastic of an effect?

Anyhooo...Heres the dyno vid. nothing out of the ordinary as far as i can see and hear. Sounds great!
http://members.rennlist.com/v1uhoh/Dyno2Darien.mpeg
(right click save as...it may be quicker)

Darien

Don't have the low octane retard loop connected yet, will be next to try

Can the low octane retard loop stay connected for an extended time?

Shane

Darien, Was I you, I would search the forum for Steve C's e-mail and send him a note with all the pertinant data to get his input. Another thought is you could try a 2nd gear run like you guys were thinking, if it comes in higher and doesn't drop off like before, then you could at least narrow down where your problem is. Engine, engine management, or transmission (3rd gear)

Edit: Here is Steve Cattaneo's website www.mastertechtrans.com

Darien

Hey Shane, we're on the same page Below is Steve's reply.


QUOTE//
If the transmission was slipping the RPMs would be bouncing off the rev limiter, it does not appear so
From the chart. Is looks like the engine ran out of power, timing or Fuel.

The throttle switch has a duel function, by being wired into the LH and EZK, at WOT the switch controls fuel
Enrichment as well as advancing ignition timing, it must be adjusted properly and functional to work as designed. Any load
Dependent component that uses engine vacuum as it signal, mush have its supply source coming from the
Intake manifold, Vacuum going to the EZK, the ignition controller must be manifold vacuum.

Once you find and fix the problem you should be in the 400 range, the hardest part is performance tuning.
Don’t give up.

Steve C

FlyingDog

My car when I bought it, Beerfish's car when he bought it, and the recent green/green 85 Euro all had the thing connected for a long time. Most people seem to see the wire and think it should be connected. I think Aussie cars have it permanently connected because they had bad gas when the cars were made.

FlyingDog

Belt stretch will only do 1/2-1 tooth. You can adjust them about a full tooth maybe more in either direction. I forget exactly how many degrees of adjustment they have. Porken has posted all the info several times among other people.

You could set the sprocket to be in time, while the cam is turned the equivalent of 1 tooth (6 or 7 degrees) off. It wouldn't be readily noticable as being wrong.

BrianG

Mark, this seems to be a bad idea, to me. The check valve would not only prevent positive pressure "boost air" flow toward the EZK, it would prevent normalizing, ambient pressure "atmospheric air" return to the EZK when manifold vacuum went neutral...........
My read is that the EZK vacuum sensor circuit would then be sealed from the check valve to the EZK and the sensor would see unchanging, max applied vacuum.

figgen

"The" diagram you were looking for? This is the one I used to put the top half of my '85 back together after intake R&R .

Darien

Thanks Rich.

After taking a closer look at the throttle body, it has 4 ports. Are there differences in vacuum pressure coming from each? I didn't think that a slight difference in pressure would affect anything, but it sure did for the transmission modulator.