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Best shift point on NPI 98 GT 5 speed

  • Thread starter Thread starter 98blackstallion
  • Start date Start date Jun 26, 2005

98blackstallion

Member
Mar 30, 2005
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mtn home arkansas
Jun 26, 2005
#1
  • Jun 26, 2005
  • #1
ok guys I need to know the best RPM to shift at on a 98 GT with Npi heads. I have a set of 4.30's in the rear, and soon to be mac o/r H pipe, flowmaster 1 chambers. Were would you guys think would be the best possible place to shift at.
 

CanadaStang

New Member
Sep 7, 2003
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Mb
Jun 26, 2005
#2
  • Jun 26, 2005
  • #2
98blackstallion said:
ok guys I need to know the best RPM to shift at on a 98 GT with Npi heads. I have a set of 4.30's in the rear, and soon to be mac o/r H pipe, flowmaster 1 chambers. Were would you guys think would be the best possible place to shift at.
Click to expand...

When I still had the NPI heads, I found I would get the best times if I shifted at 5400rpm from 1st to 2nd, and the rest of the shifts at 5200rpm. But that was with the stock 3.27's
 

quiksilver98

New Member
Jan 25, 2003
251
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Orange County So.Cal
Jun 26, 2005
#3
  • Jun 26, 2005
  • #3
When I had the non-pi motor shift points were
  • 1st gear: 5200 rpm
  • 2nd gear: 5500 rpm
  • 3rd gear: 5600 rpm
  • 4th gear: 5800 rpm
 

Gearbanger 101

Straight Outta Locash
20+ Year Stangneter
Aug 10, 2002
9,457
1,377
234
Ontario, Canada
Jun 26, 2005
#4
  • Jun 26, 2005
  • #4
Since most stock tach's are out to lunch, the rule of thumb is......find out where it starts falling on it's face and shift about 200rpm after it stops producing power.
 

blackink00

I missed a shift & stole Curt's money.
Mar 30, 2005
545
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Tempe, AZ
Jun 26, 2005
#5
  • Jun 26, 2005
  • #5
5300-5400 is the best bet
 

edbo

New Member
Mar 31, 2005
198
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0
Valley, AL
Jun 27, 2005
#6
  • Jun 27, 2005
  • #6
quiksilver98 said:
When I had the non-pi motor shift points were
  • 1st gear: 5200 rpm
  • 2nd gear: 5500 rpm
  • 3rd gear: 5600 rpm
  • 4th gear: 5800 rpm
Click to expand...


I usually hit 5500 2nd to 3rd and 3rd to 4th. Little higher going into 5th at approx 5700-5900 rpm. Managed under 15 secs in 1/4 mile with 4.10s (still completely stock NPI motor) and mine is a 'vert.
 

mrvax

Stay thirsty my friends
Founding Member
Nov 29, 1999
5,225
3
79
SN Moderator: Orlando, Fl.
Jun 27, 2005
#7
  • Jun 27, 2005
  • #7
A good baseline is to add 10% rpm to the peak HP rpm value. For example, if you make your max HP at 5000 rpm, then 5000 + 10% (500) = 5500 rpm.
 

98blackstallion

Member
Mar 30, 2005
602
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mtn home arkansas
Jun 27, 2005
#8
  • Jun 27, 2005
  • #8
ok thanks guys.
 

edbo

New Member
Mar 31, 2005
198
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0
Valley, AL
Jun 28, 2005
#9
  • Jun 28, 2005
  • #9
Not a problem. Something to consider, a short shifter to hit those gears easier and quicker...
 

98blackstallion

Member
Mar 30, 2005
602
0
17
mtn home arkansas
Jun 28, 2005
#10
  • Jun 28, 2005
  • #10
i have a steeda triax so i am covered there
 
S

stang96blkgt

New Member
Nov 19, 2003
53
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0
Oct 13, 2005
#11
  • Oct 13, 2005
  • #11
get a shift light
 
S

stang96blkgt

New Member
Nov 19, 2003
53
0
0
Oct 13, 2005
#12
  • Oct 13, 2005
  • #12
98blackstallion said:
i have a steeda triax so i am covered there
Click to expand...
Good choice
 
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