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04-08-2008, 09:46 PM #1
- Join Date
- Apr 2008
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- Southern Illinois
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- 5
Differences between 98 ls1 and 99 + ls1
Hi- first time post for me. I am putting a 98 ls1 in a 1954 mercury. I noticed that the listings for aftermarket harnesses are different for the 98s vs. the newer ls1s. I would like to know the difference between the 98 ls1 (engine, computer, harness) and later years.
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04-09-2008, 02:28 AM #2
The 98 has a different ECM ( computer ) with different pin locations on the plug. So, if you have a 98 ECM, order the 98 wiring harness.
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04-09-2008, 03:26 AM #3
i'm pretty sure the heads are different too. 98's had centerbolt style.
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04-09-2008, 04:18 AM #4
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04-09-2008, 06:31 AM #5
Any Changes in HP/TQ between the years?
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04-09-2008, 12:10 PM #6
Not that I know of...
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04-09-2008, 01:33 PM #7
- Join Date
- Oct 2006
- Location
- St. Clair Shores. Michigan
- Age
- 55
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- 1,602
Navy Blue Metallic- `98 Formula M6 HdTp
Craig
Semi Retired Street Racer
2012 Lava Red Mustang GT Coupe Brembo/3.73's
Build Date 3/17/11, Last Lava Red GT
Gone but not forgoten
NBM `98 Formula M6 HdTp
1 of 1 Build Date 3/12/98
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04-09-2008, 05:38 PM #8
yeah 5hp 98-00 rated 320, 01-02 rated 325
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04-09-2008, 05:45 PM #9
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04-09-2008, 09:25 PM #10
- Join Date
- Apr 2008
- Location
- Southern Illinois
- Posts
- 5
Thanks for the info especially the link. Since I did not get a computer or harness with the engine, can I use a 1999 and later computer and harness - any advantage to doing so?
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04-09-2008, 09:56 PM #11
front wheel horse power???
yea we all know we all have around 330 to 350 crank hp not 320 and 325...but it cant be fully determined unless you get a good base wheel # and then calculate your power train loss and ect then do some more calaculations and find your true crank hp, or get it bench tested.
I know that my Gas Cap on my 98 is different then all of the 99's and above, I also know my fuel tank is the smallest of all the years, I know my fuel injectors are the biggest of all the years...atleast thats what ive read, I believe I have the smallest cam of all the years, I know my exhaust tips are the square type like the older vettes had and mid 90's camaro had. My cruise control is attached to my throttle unlike the seperate unit everyone else has... we could go all day I guess.
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04-10-2008, 04:18 AM #12
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04-10-2008, 04:26 AM #13
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04-10-2008, 04:43 AM #14
- Join Date
- Nov 2005
- Posts
- 32
Red- 1998 Pontiac Trans Am
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04-10-2008, 11:30 AM #15
- Join Date
- Oct 2006
- Location
- St. Clair Shores. Michigan
- Age
- 55
- Posts
- 1,602
Navy Blue Metallic- `98 Formula M6 HdTp
My dyno #'s were 300 HP and 322 TQ done 2 yrs ago at 109K miles on the original clutch. Calculate a 12-15% driveline loss (manula trans) and I'm right in the ballpark of 345-350 FLY WHEEL Horse power
On a side Note
Too many people use their Dyno numbers as bragging rights. Dyno numbers mean very little in respect to how fast a car is in a drag race. Cause the more powerfull car is NOT always the winner.
`98 have an on demand fuel systewm with No return line. 28# Injectors (Same as `01-04 LS1's), All `98-00 F-bodies have the same cam 198/209 500/500 119.5 LSA. And your cruise comes off your throttle body cause you don't have Traction Control.
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04-10-2008, 12:04 PM #16
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04-10-2008, 02:05 PM #17
Here are the items specific to 1998's:
1. Had differnet casting heads which had perimeter bolts and valve covers.
2. Ignition coils were mounted to the valve covers one at a time.
3. The water temp gauge actually works.
4. 98's do have an oil life monitor, they just don't tell you anything when its time for a change. You can find it in Auto-Tap
5. WS6s had single outlet exhaust (all others had duals)
6. Only year that Purple, Gold, and Green were available
7. Some very early Trans Ams came with LT1 style headrests
8. Rear hatch release was poorly designed and often caused problems releasing mechanism
9. Early model 98 Monsoon stereos didn’t have capability to control 12-disc CD changer
10. 1998-1999 automatic transmission LS1s could be started in 1st gear even with the shifter in 2nd. Starting 2000, if you put the shifter in 2, it would start off in 2, even from a stop.
11. 1998-1999 LS1 cars had a smaller throttle body cam, which caused the throttle to open to WOT faster than 2000+ cars
12. 1998 cars had 28 lb fuel injectors from the factory
13. 1998-1999 cars had more restrictive exhaust manifolds
14. 1998-2000 cars had an LS1 intake with EGR
15. 1998 and some early 1999 cars had blue outside rear view mirrors (TA/Formula only)
16. 1998 only LS1 blocks had a much smaller cylinder sleeve that only tolerated a .005" hone
17. Last year F-body to use the old 15.5 gallon steel fuel tank.
18. Only year LS1 F-body to contain a gascap with a tether long enough to actually hang from the fuel door while open
19. Only year LS1 F-body to not contain the famous GM black box used in the event of an accident to record up to 5 seconds of pre-crash data
20. 1998 only cars had a different PCV system with the PCV valve located above the passenger side valve cover
21. 1998 most cars did not have an idle adjustment screw on the throttle body. Some 98 cars do have the idle throttle stop set screws.
22. 1998 cars have a completely different PCM from 99+ cars
23. 97-98 LS1's used a paper water pump gasket. The only gasket that isn't reuseable
24. SSs did not ALL go to SLP starting in 98. Y2Y was the RPO code that sent them to SLP for additional options
25. SS option did not "include" the Synthetic oil package, it was a SLP only Option
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