DragStuff

I had Marty build me a converter for my 6" rod 388 last year. We are now running a 5.7 rod 355 because we are freshening up mine and getting it ready for bigger and better things. How much of a difference should there be? My car is real lazy naturally aspirated (1.70 60 foots). On the bottle I can't seem to keep the damn thing off the rev limiter in first gear. I did notice the other day that it's only dropping 200 rpm or so on the 2-3 shift.

200 rpm is no enough drop.

That sounds real loose - how are you measuring it?

I went and looked at some old passes, and my 2-3 shift was 1400 rpm drop - course this is going to vary with how tight the converter is, etc. but 200 rpm is not much. What is it on the 1-2?

This is just what I saw last Friday when we went to mokan. I don't have a logger so I have to look at the tach when I shift. The 1-2 seemed to have a little more drop but not much more than the 2-3 shift.

what rpm do you shift at ? If you short shift there will be little drop.

I am shifting right around 7200 on the bottle. On the motor I am shifting around 6800 and it drops about 600 rpm.

Sounds alittle loose. If you are 1/8 mile racing and you do not plan on running any more nitrous then 600 rpm drop is livable, but if you want to add more nitrous you will need to tighten the converter.