I just recently swapped from the ST3500 to the PT4000. Streetability takes a pretty big hit. Throttle tip in is noticably worse on the Pro Thruster series of converters.

BUT...the extra 500 rpms in shift extension make the car a monster from a roll in comparison to the ST3500. Third gear now feels like a nitrous shot kicked in. RWHP is unchanged as the PT4000 is very, very efficient upstairs (as is the Super Thruster). I have 3.73 gears, so most of my driving is between 2500-2800 rpms.

There is no comparison in racing from a roll...from any speed.

The Pro Thruster is actually easier to launch on street tires because of the soft initial hit. Stick your foot in it all the way though, and you'll melt the tires. If you want the best converter for the strip or for racing from a roll, the PT4000 is unmatched. For all around streetability with excellent performance, the ST3500 is still my favorite.

 

Comparisons of the following:

60ft. times
shift extension shifting @ 6600-6700
street racing on Nitto's
track racing on ET's
highway racing from 50-80 to 120-140
efficiency at the rear wheels unlocked in real world conditions (not on the dyno)

I'm putting one of the two in next week and I am having trouble realizing if the PT4000 is that good that I should put it in and deal with the higher stall speed putting around town for the gains in the questions above?

<small>[ September 10, 2002, 12:08 PM: Message edited by: OBSSSD@work ]</small>

 

I can tell you that I gained at least .1 at the track, the shift extension increased by about 400 rpm, the midrange from a roll gain passed the SOTP test and extra stall made it easier to launch hard on the street with nittos (more room to step into it). I don't use a lock-up switch, so I can't tell you real world efficency, but my 3rd gear dyno result was 13 HP loss on 378 rwhp.

It is definitely looser by 300 - 400 rpms in town.

Good luck in deciding. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

I used to have an ST-3800 and now have the PT-4400.

I liked the ST-3800 because it was a little more mild for daily driving, it didn't rev so high taking off from a light at part throttle. Best 60' time before heads cam was 1.68.

The PT-4400 is awesome at the track! I have not had my heads/cam tuned right so my power is too low to get any real decent 60's plus I kept blowing up trannies so thus far my best 60' is only 1.58. The PT-4400 is more of a pain for a daily driver. I generally rev to about 3000-3400 when taking off from a light at part throttle and this is with 3.73 gears. I had to put my high flow cats back on to reduce the exhaust noise when rolling through town because it was obnoxious. I think on a car that is putting out the 400+rwhp it should be with heads/cam then it won't be so bad. I have only been at about 360rwhp so that may be why mine is still so loose.

On Nittos for the street I would give the nod to the ST-3500 since it will be much easier to launch. So if you are concerned more with street racing on Nittos then I would say the ST-3800 would be a good choice. If you are like me and care more about track times then run the PT-4400 with Nittos as a daily driver and the ET Streets or Hoosiers at the track.

The Nittos WILL NOT hook off the line on the street, I just use em to keep from killing myself when nailing it at 40mph. LOL