kkitelinger

I recently put on an HTT 62/12 on my 95 and towed with it for the first time a couple of weeks ago. The turbo was surging a lot, it wasn't to bad in drive and I could drive around it, but if I went into O/D it was real bad. It is doing it in the 20-25 psi range when running differrent RPM's. I talked to HTT and they recommended checking fuel pressure, it was a little low so I have replaced the lift pump (it had been leaking a little anyway) and the pressure looks good now. Anybody else experience this with a 62/12? Looking for more ideas on what to look at?

RowJ

Surge going into OD is a universal problem for medium sized turbos on CTD automatics. Only thing I ever found that worked was to be sure I was accelerating when tranny does the 3-4 shift. Example - hardly ever happened at WOT. Once in 4th (OD) you can ease off throttle and avoid surge. Not the fault of the turbo... but the big gearing difference between 3rd & 4th.
Was actually fairly easy to adjust driving habits and make it work.

RJ

dzlfarmboy

Yeah with my 66 i ethier have to be excelerating good or let of the throttle most of the way for it to shift ok and not surge real bad

kkitelinger

The problem isn't when it shifts, it when I'm just rolling down the road in O/D and boost gets in the 20+ range. Real bad when pulling up a hill. Unless I can get something figured out soon I'm going to have to put the stock turbo back on (really don't want to do that!!).