PRY4SNO wrote:Congrats on finding the solution!
I feel kinda dumb asking, but can't quite tell what adjustment made the difference since none of the pics are taken from the same location. I assume you cut it off and realigned, no?
Yeah sorry... it probably wasnt real clear. I just hacked off the EBay TB flange and welded on an AAN throttle body. That wat I could use the same TPS I have and I had the parts laying around.
If I could figure out how to post short videos here I would but, here's kind of a rundown of what I was running into.
first, I could not get the car to idle below about 13-1400 RPM when hot . With the throttle body sitting on the stop there was still too much air coming in. I could back out the stop screw but the TB spring is not strong enough to force it closed any more so I would have to get out of the car, pop the hood and force it closed by hand to bring the idle down.
A separate but somewhat issue was I could not get the TPS to read right , no matter how many times I re-clocked then recalibrated it, It would start at zero tbut when pushing the pedal down it would travel a good 3/4 inch or so before it would start to read, then it would go like 1, 7, 10. So the issue that was causing is I would have to disable the "overrun fuel cut" because with the throttle body not reading any % throttle , as soon as you add throttle to bring the rpms up VEMS cuts the injectors because it thinks its in decel. (at least this is what I think was happening) I could just disable that feature but I think it will really help with drivability down the road.
The third issue was that with the weak spring every time I let off the gas the TB may come to a slightly different position which although extremely small deviation , maybe a few degrees, it still equals a shitload of air and is enough to totally throw off the tuning because the TB is just a big 70MM butterfly with no ramp at all. its like more open/closed.
Typically when I'm having any issue, I assume that I did something wrong first. So first I redid the cable setup to make the path straight and also to ensure that there wasn't extra force fighting the spring, went to the hardware store to see if I could get more springs, which I did find but I would have to weld attachment points to the TB for an additional spring. Then I double, triple and quadruple checked for vacuum leaks, capped the brake booster line, removed the fuel rail to ensure that I didn't screw up one of the O-rings or have a leak on the lower injector O-ring. Talked to Sam a little and re recommended a few things which were great Ideas (reducing timing at idle, check for O-ring leaks) but after doing those things it still seemed like there was just too much air coming in, and that this Ebay TB was going to create some drivability issues with its On - off nature and TPS issues. So I decided to hack it off and weld on the one AAN unit that I had laying around. I saw that if I Oval out the holes on the AAN TB, I could use 3 of the 4 existing bolt holes from the EBay throttle body flange but I decided to just hack it off and do an AAN flange. I had already cut up an AAN intake long ago with plans of making a custom one so the flange was ready to go.
this chain stuff all looks
