dyno issue...
dyno issue... whats up guys, So i am having an issue with my car and cant seem to find it. its a 408ci, s484 setup in my 99 f body on e85. On 11lbs through a th400 the car made 716whp after about 2 pulls and 14 degrees of timing. the graph at a normal arch to it when boost built. We added 3 lbs of boost to abotu 14 psi. it made about 765 and the graph dropped off on a downward slope which my tuner and i both found extremely odd. He said it felt like spark blow out. We changed the plugs and turned the boost controller back off so its back to 11.5 lbs now which it was at orginally...now the entire way the car makes power is different. no more arch to the graph. it almost like flatlines in power and makes 588? and 570whp...I have no smoke coming from anywhere out of the ehxaust, not even a haze. no blow by or anything. I am kind of at a loss for words. Could any one shed some light as to what it could possibly be? I am personally leaning towards torque converter. The stall speed of the converter was supposed to be around 4500rpm but i cant get it to go past around 3400ish before it actually starts to build boost off the brake...I havent tried the transbrake before this problem actually occurred. Seems like an odd problem for sure. Thanks in advance!
Trying to get my tuner to send me the good runs vs the flat line runs. Even though it should measure wheel speed. My speedo doesn't work in the car.
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Verdad Gallardo Usually you can't see it till you take it apart and look down the inside. The cheap ones are really know for collapsing. If you have an o2 sensor before it you can take it out and install a pressure gauge and see what you have. You should have very little back pressure like maybe 1psi. Just something else to check. and a little easier to check, if the converter is ok.
Usually you can't see it till you take it apart and look down the inside. The cheap ones are really know for collapsing. If you have an o2 sensor before it you can take it out and install a pressure gauge and see what you have. You should have very little back pressure like maybe 1psi. Just something else to check. and a little easier to check, if the converter is ok.
Trans builders will usually tell you high stalls and dyno's are not a good match-my buddy tells me its one of the complaints they get, but its fine at the track-its a possibility you over heated the trans, but did you mont. trans temps
I have experienced intake tubes cols. also, and boost side pipes pulling under boost, then going back together-that one drove me crazy
You are making power though
I have experienced intake tubes cols. also, and boost side pipes pulling under boost, then going back together-that one drove me crazy
You are making power though
Trans builders will usually tell you high stalls and dyno's are not a good match-my buddy tells me its one of the complaints they get, but its fine at the track-its a possibility you over heated the trans, but did you mont. trans temps
I have experienced intake tubes cols. also, and boost side pipes pulling under boost, then going back together-that one drove me crazy
You are making power though
I have experienced intake tubes cols. also, and boost side pipes pulling under boost, then going back together-that one drove me crazy
You are making power though
The trans shop called me back today and said the transmission is perfectly fine. he went through it and dyno tested it. All looked great. does any one have any other ideas of what it could be.
