early 99 differences?
Elder User
Joined: Sep 2006
Posts: 627
Likes: 0
From: Middleton, Idaho
The cut off date for the early 99 is 12-7-98, anything after that will be a 99.5. They changed some of the suspension after 3-1-99, so someone might have the older suspension with the newer motor.
The early 99 does have a smaller turbo but we don't experience the dreaded turbo surge that comes with having that bigger turbo. Injectors are 120cc for the early VS 140cc for the late 99. I beleive the HPOP is 15 degree on the early and 17 on the late. Stock HP is 235ish for the early, 250ish for the late.
When you start doing your mods it's important to tell your supplier early or late as it will effect your performance. Stick with the stamped dates as badges on doors or quarter panels are unreliable.
My 2 cents,
Jeff
Early 99 4X4 CC DWR, 6637,Straight piped, ISSPro gauges,pyro, boost, water temp, DP Tuner stock, 40tow, 60tow, 80econo, 120race, KCM S.S. HPX line, ITP Overboost Annihilator. In that order
.
The early 99 does have a smaller turbo but we don't experience the dreaded turbo surge that comes with having that bigger turbo. Injectors are 120cc for the early VS 140cc for the late 99. I beleive the HPOP is 15 degree on the early and 17 on the late. Stock HP is 235ish for the early, 250ish for the late.
When you start doing your mods it's important to tell your supplier early or late as it will effect your performance. Stick with the stamped dates as badges on doors or quarter panels are unreliable.
My 2 cents,
Jeff
Early 99 4X4 CC DWR, 6637,Straight piped, ISSPro gauges,pyro, boost, water temp, DP Tuner stock, 40tow, 60tow, 80econo, 120race, KCM S.S. HPX line, ITP Overboost Annihilator. In that order
.
Senior User
Joined: Jul 2003
Posts: 139
Likes: 0
Originally Posted by John311t
I have almost converted my e99 to a late 99. All that is left to change that i know of is the hpop and injectors. The turbo is done, the brakes are done.
Postmaster
Joined: Dec 2005
Posts: 3,405
Likes: 0
Yup, i did the 3" manifolds also, you have to when you change the 5 way spider. I dont know about the IDM though, mine is modded anyways.
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