mike13

iTrader: (27)

Here's my dyno, it's a 4000 vigilante converter spec'd for 500 horsepower, I now make a couple hundred more, is this look like the converter is slipping? In the datalog there is over a 800rpm discrepency between rpm and mph. The green line is the boost and you can see as the boost takes off the graph gets all crazy. No wheel spin.

mike13

iTrader: (27)

anything from the converter manufacturers?

mike13

iTrader: (27)

Anyone else see this before?

ThreeHonks

iTrader: (10)

hmmm that is odd looking. Is it a 60e? was the converter locked during the pull?

mike13

iTrader: (27)

Yes 4L60e , no the converter wasn't locked, the converter felt pretty loose on the street and I think the dyno just compounds that. I think the converter flashes to where you see the boost shoot up, as the load on the motor is what would build boost.

It says I made 445rwhp with a 383 (ls1 based) with Patriot heads, 224/228 cam, 80mm turbo at almost 17lbs boost.