![]() |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
![]() |
degreeoff |
![]()
Post
#1
|
I like big butts and I can not lie! ![]() ![]() ![]() Group: Members Posts: 1,622 Joined: 9-February 03 From: Booowieeee MD (near DC) Member No.: 275 Region Association: MidAtlantic Region ![]() |
First off good day to all the old salts and fresh meat!
Just aquired a 902/02 tranny from a 912with the MSX gearset....YAY! (or not?) I must say that with all my track time (not much but more than a few days) I have yet to top out and have been lusting after the shorter box for some time. I do have concerns that some of you may be able to answer. 1) for you higher HP guys with this layout, do you run out of gears on the longer straights? (Summit point, VIR the Glen) 2) is it a big a PIA on highway trips as it looks on the charts? Now I am @ 3200 +(-) going good on a highway but to spin 4k....?) Lastly anyone have a track vid out with the MSX combo I could see...I am @ 182hp at the wheels with a 7k redline...... thanks you"all! Josh C (aka Kermee6) (IMG:style_emoticons/default/driving.gif) ![]() |
![]() ![]() |
Richard Casto |
![]()
Post
#2
|
Blue Sky Motorsports, LLC ![]() ![]() ![]() Group: Members Posts: 1,465 Joined: 2-August 05 From: Durham, NC Member No.: 4,523 Region Association: South East States ![]() |
Josh,
As you asked about high RPM on the highway, so it sounds like this is a dual purpose street/track car? My gearing chart are telling me that you get the following with a 24" tire at 7K RPM N 90 MPH V 122 MPH ZD 159 MPH M 86 MPH S 109 MPH X 132 MPH Lastly one option that you might consider for 5th is to flip your N third gear and use it as 5th gear... N(f) 142 MPH That is an easy to source (you already have it) compromise between X and ZD If you have some favorite tracks, I am expecting that you should know what speed you are able to achieve on the long straights. Using that info you should be able to work backwards to see if you are going to run out of RPM using an X gear for 5th (and clearly having lower gears should allow you to obtain a higher top speed assuming you don't run out of RPM). At interstate speeds (75 MPH or so) you will be turning the following RPM... X 3990 N(f) 3690 ZD 3300 RPM So you are going to see nearly a 700 RPM jump moving from the ZD to X. The RPM difference grows the faster you go. My car is going to be a dual street/track car and don't plan to trailer it when going to the track. It is not finished, so I haven't quite decided what gearing to use yet. It's likely that I will use a lower 3rd and 4th such as M and S, but with a tall 5th gear (taller than X and maybe even the stock ZD) as I expect to use the car for long overnight trips. That will hurt me on long straights at track, but this is to be a compromise car. And I agree that you need to hear directly from some others who have MSX gearing and use it both on street and direct. They can give you comments based upon real world experience. Good luck! And let me know if you need any other help with the regearing! Richard |
![]() ![]() |
![]() |
Lo-Fi Version | Time is now: 16th June 2024 - 12:02 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |