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General 98 pcm tuning question

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Old Jun 17, 2008 | 11:26 PM
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Default General 98 pcm tuning question

I've been searching for help with some questions about the problems with the pcm in 98-ls1, and so far I havent really been able to find the answer.

My question is when I start my cam install is it possible for me to make the same amount of power with the cam and 98pcm or is a 99+ swap really neccesary, also would a tuner charge alot more having to deal with the 98pcm? Any help would be appreciated.
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Old Jun 17, 2008 | 11:42 PM
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in short, no and no
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Old Jun 17, 2008 | 11:49 PM
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alright, so unless I plan on going with any type of boost or spray I should be alright?
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Old Jun 18, 2008 | 06:25 AM
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Spray will not be an issue either.
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Old Jun 18, 2008 | 07:41 AM
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What are your ultimate plans for the car?

What size of cam?

Do you plan on doing heads in the future?

Dry or wet shot?

Drivability (hot/cold starts, idle coming to a stop, etc.) will take more time (which equals more money) on a heads and large cam style setup on a 98 if you do not have a realtime tuning solution.

HP does not offer one and, the relatively small segment of 97-98 cars does not warrant the cost of a 98 RR for my company.

If you are planning on a larger cam and then heads or a large wet N20 setup then I would consider the swap to be able to attain the drivability with a realtime tuning solution and run a custom OS to pull timing and add fuel from the pcm.

If you are planning on running only up to a relatively moderate cam (no heads) w/ (< ~230 duration) with a small dry shot, then no need for the swap and or extra charge for the tune.
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Old Jun 18, 2008 | 11:22 AM
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I'm runnng Ported aftermarket heads, medium cam (228) and ALL the bolt ons, with a 150hp wet kit and my tuner (and soon me when I learn how to use this HPTuner) has mine running like stock. (until you nail it)
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Old Jun 18, 2008 | 11:28 AM
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98 pcm's aren't that bad for a tuner with experience, I had a heads/cam 98 Z and had no issues.
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Old Jun 19, 2008 | 08:12 AM
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98 computers are more time consuming and are more limited. However unless your running boost its not nececarry i would also consider it for nitrous but i just really like the efi custom operating system for nitrous.
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Old Jun 19, 2008 | 11:24 AM
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HPTuners has a 2bar OS for 98s, so boost really isn't a problem either.
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Old Jun 21, 2008 | 10:48 PM
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Got a 98 as well and glad to hear that
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