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1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-06-2004, 04:27 PM   #11
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Quote:
Originally Posted by Merlin 91/97
Ok... tire sizes are stock....

Here'* the results from my latest run...
2000rpm @ 90 kph = 55.9234073 mph
2250rpm @ 100 kph = 62.1371192 mph
2400rpm @ 110 kph = 68.3508311 mph

Somethings of note.... OD does not kick in until 75kph (75 kph = 46.6028394 mph)
RPM is 2300 @ 70kph, just before OD kicks in.
RPM is 1900 @ 75kph when OD kicks in.

Do these numbers sound right? or are the RPMs high... I'm thinking the RPMs are high.
Hmm, you cruise higher than I do, I guess I've got a 2.97 ratio then. But OD seems to kick in unusually late for you, with your shorter gearing, if anything, it'* supposed to go into OD sooner than a non-GX3 equipped car. OD can come at 60-65km/h (about 40mph) for me.
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Old 09-06-2004, 04:31 PM   #12
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BTW... I'm getting horrible gas milage.... 350km per tank.
(And no it'* not ALL my heavy foot)
Tank I suspect is 50-60L.

Cruising on the highway @ 110kph @ 2400rpm kills gas fast, espically when you just tap the pedal at that point you're up over 2500rpm before you reach 120kph.

Any ideas what could be going on here folks?
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Old 09-06-2004, 04:32 PM   #13
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Stock tires - 3.33 axle - lockup o/d = 2200 rpm @ 70 mph . Is the 2400 reading from your Tach or a scan tool ?

Lockup in the 45-50 mph range sounds right, is MPH & gear related, not rpm.

BTW I usually fill ours at 300-340 miles (less if wife driving around town).

When did you replace the O2 sensor last ?
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Old 09-06-2004, 04:39 PM   #14
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The OD speed is right, because its supposed to kick in at 45mph, so that'* good. But the RPM seems WAAAY too high for OD, especailly at 45mph. There must be something up with you TCC. I can dig up what my FSM says to test if your OD and TCC is functioning properly, if you'd like.


-justin
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Old 09-06-2004, 04:44 PM   #15
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Quote:
Originally Posted by padgett
Stock tires - 3.33 axle - lockup o/d = 2200 rpm @ 70 mph . Is the 2400 reading from your Tach or a scan tool ?
Tach reading

Quote:
Originally Posted by padgett
BTW I usually fill ours at 300-340 miles (less if wife driving around town).
That'* miles... my # is in KMs. 350km = 217miles

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Originally Posted by padgett
When did you replace the O2 sensor last ?
Probably last year.
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Old 09-06-2004, 06:25 PM   #16
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Quote:
Originally Posted by padgett
Stock tires - 3.33 axle - lockup o/d = 2200 rpm @ 70 mph . Is the 2400 reading from your Tach or a scan tool ?
ack, this still could mean I have the GX3, hah


i really should check my RPO codes
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Old 09-06-2004, 07:08 PM   #17
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my 1989 SSE has a 1987 2.84 tranny i believe and i do 1400RPM at 50mph and 1550 at 60mph...at 2,000 im at 78-82mph

i get better mileage
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Old 09-06-2004, 07:51 PM   #18
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Let me give you a hand with this, I forgot about the chart, thanks for reminding me!

Which model tranny do you have, I have several listed here with the 3.33 drive axle.

*9AAH, 9ABH, 9AFH
*9ANH, 9ATH
*9BJH
*9BWH
*9CDH, 9CLH, 9CZH
*9CPH, 9CYH
*9PAH
*9VXH

* equals different catagory, models separated by comma'* are different transmissions, but in the same catagory.


-justin
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Old 09-06-2004, 08:40 PM   #19
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Service manual gives reanges so broad that you really cannot tell much.

To tell what transmission you have, you rally need the letter code. For exmple in 1987 the Bonnevile shows a 2.97 (AFJH - F79) and a 2.73 (AFKH - FP3). 2000 at 78-82 sounds like a 2.73 with a couple of mph error.

For example my 1988 has a code F79 (three digit code is on the option sticker, four digit code is on transmission) which means it has a 2.97 and 70 mph is 2000 rpm actual but the tach shows 2100 (scan tool will give rpm to 25 rpm granularity and MPH directly)

Other codes for 1990 are F17 for 2.84 and GX3 for 3.33 (numerous foulr digit codes) so if the original trans, the code sticker is the best place to look.

That said, both RPM (from ISC) and MPH (from transmission at 4000 pulses per mile) are pulsed digital signals fed to the ECM. These are translated into analog signals for the instruments so what the scan tool says is closer to reality than the guages.
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Old 09-06-2004, 11:23 PM   #20
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How can I find the 4 digital code for my transmission?

Here'* a link to my buildsheet, if that helps...
http://rubix.ca/Bonnie/91sse/91sse_buildsheet.jpg

Sidenote.... what does ME9 "Man 5 SPD Eaton FSO-2305A 4" mean?
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