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Unread 06-26-2002, 11:22 AM   #1
GabrielCJ7
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Join Date: Jun 2002
Location: Venezuela
Posts: 10
258īs rpm

Hi there all good jeepers, iīve a 258 and need to know how many rpms itīs capable, iīve a tachometer and donīt know whatīs good and whatīs not good

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81 CJ7 258 6 cyl. 4 spd tranny 35ī BFG mud terrains soft top RS9000īs shocks(BLACK HERMAN)
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Unread 06-26-2002, 11:59 AM   #2
johny1i
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Join Date: Mar 2002
Location: Crestview, Florida
Posts: 782
I assume you're asking about the maximum RPM (redline)? According to my factory tach, mine redlines around 4500, but in the 5 years I've owned it, it has never been over 3000 (and it's only seen that a couple of times). With the age of mine (and it's not nearly as old as yours), I'm afraid that thing may fly apart <img border="0" title="" alt="[Eek!]" src="eek.gif" /> ! Generally speaking, I don't see much effect after I get it above about 2500 rpm, so that's when I usually shift.
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Unread 06-26-2002, 02:01 PM   #3
GabrielCJ7
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Join Date: Jun 2002
Location: Venezuela
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Thanks a lot jhonny and one more question... the size of tires could affect the rpmīs of the engine??? sorry, iīm newbie but learning quickly
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81 CJ7 258 6 cyl. 4 spd tranny 35ī BFG mud terrains soft top RS9000īs shocks(BLACK HERMAN)
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Unread 06-26-2002, 05:40 PM   #4
only in a jeep cj
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1986 CJ7 
 
Join Date: Jun 2001
Location: Mobile, Alabama
Posts: 4,205
My power curve goes dead at 3K. I not only have no more power, but the high RPMS unnerve me. It pulls strong from 700 up and will pull as low as 100 (yes,barely running)I can cruise around town all day long at 1500....that is what it "likes" best. Shift points: Normal acceleration is 2200 and a hard take off is 2700 to 3000. The tire size has a lot to do with where your power band will be and the "load" your engine sees. Proper gearing for the size tire will help offset this. I'm running 3.31's in my daily driver with 265 70 R15's ( about 29.5 inches) and find it to be fine. I went to 31 for a while and you would think the 1 1/2 or so wouldn't make a difference, but it did. Off road, my crawl speed was much faster and the engine bogged down big time at the slightest hill.
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1975 CJ-6 304 T15 Dana20 30/44 3.73
1983 CJ-8 258 T5 300 30/44 3.31 Looking for full or half hardtop buy or trade
1986 CJ-7 Laredo 4.6 stroker T5 300 30/44 3.31
1986 TJ-7 Trail Jeep project in the works
2003 Inca Gold TJ Rubicon
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