tire recomendations?
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tire recomendations? - 12/15/2006 3:32:36 PM
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skitzobmxr
Posts: 107
Joined: 12/12/2006
From: wisconsin
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i need sum new tires...any ideas im lookin for lotsa tread and a big tire but idk anything about sizes and i dont want to just go buy 4 tires that wont even fit on my truck
1991 s10 blazer 4x4 4.3L vortec v6 4-door
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RE: tire recomendations? - 12/15/2006 3:57:00 PM
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20Blazer00
Posts: 862
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It will depend on how much money you want to spend. If you want big bad ass tires then you will have to do some computer mods to adjust for the tire size changes.
The newer 4L60E tranny computer settings come from the factory with a 28" circumference (235x70-15R All Season Radial). The largest you can go without computer upgrade is 28.9" or 235x75-15R. Anything bigger will cost you in performance and mileage unless you adjust the computer to compensate...
Also the more rubber that contacts the pavement the more resistence there is and the more power you need to overcome it and the more gas you will use to get up to cruising speed whether on the highway or in town between stop lights...
< Message edited by 20Blazer00 -- 12/15/2006 3:59:31 PM >
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Mark
2000 Blazer LS 4dr 4.3L Auto
1999 Grand Am 3.4L 4dr SE2 - Traded
2000 Honda Odyssey 3.5L 5dr Mini-Van
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RE: tire recomendations? - 12/15/2006 3:59:59 PM
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skitzobmxr
Posts: 107
Joined: 12/12/2006
From: wisconsin
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wut about clearance...will they fit without any problems
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RE: tire recomendations? - 12/15/2006 4:02:22 PM
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20Blazer00
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I think the largest tire you can fit into the fenders would be 30" but then you might rub when you turn the wheel to full lock right or left. It will either rub the frame or inner fender but I might be thinking of 31" tires...
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Mark
2000 Blazer LS 4dr 4.3L Auto
1999 Grand Am 3.4L 4dr SE2 - Traded
2000 Honda Odyssey 3.5L 5dr Mini-Van
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RE: tire recomendations? - 12/15/2006 4:20:13 PM
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20Blazer00
Posts: 862
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They will fit into the fenders but would have them check to see for clearance when turning if you get them...also since these tires are 2" taller than stock you will have some issues with the way the transmission will shift and drive in town. If you look on the driver side door you should see a label that tells you what tires came stock with the truck and you can go from there...like I said earlier any more than 3% larger than stock will require computer work to get the trans to work like it should. If you plan on keeping the truck you could also look into gearing changes in the front and rear differentials to offset the larger tires...but that is the expensive side of the equation...
_____________________________
Mark
2000 Blazer LS 4dr 4.3L Auto
1999 Grand Am 3.4L 4dr SE2 - Traded
2000 Honda Odyssey 3.5L 5dr Mini-Van
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RE: tire recomendations? - 12/15/2006 4:50:48 PM
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skitzobmxr
Posts: 107
Joined: 12/12/2006
From: wisconsin
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i think i found better ones...28 wil fit rite?
Goodyear Wrangler
*EDIT by swartlkk* - fixed long link
< Message edited by swartlkk -- 12/15/2006 9:13:21 PM >
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RE: tire recomendations? - 12/15/2006 9:17:49 PM
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Hanr3
Wheels & Tire Moderator
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My stock tire size is 235/75R15 and I have been running 30" tires for the past 2 years.
31" will rub.
30" tires also fit on the older Blazers without rubbing, and they came stock with 205/75R15 or 215/75R15 tires.
There will be some performacne loss, but unless your really hardcore about it, I doubt you will notice it.
_____________________________
"Some people spend an entire lifetime wondering if they made a difference.
The Marines don't have that problem."
-President Ronald Reagan
'87 S10-Blazer - SOLD
'93 S10-Blazer 4x4x4 - Sons DD, engine swap is done.
'00 S10-Blazer 4x4x4 - My
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RE: tire recomendations? - 12/15/2006 9:20:37 PM
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swartlkk
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From: Waterloo, NY
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Check the sticker on the door for your factory tire size. It is possible that you came from the factory with 235/75R15 (28.9" od tires). If your truck came with 235/70R15, anything larger will throw off the speedo. The jump from 28" od to 28.9" od will make your speedo ~3% slow so at a speedo reading of 60mph, you will actually be going ~62mph. Now if you have 235/70R15s and jump to 30x9.5 tires, your speedo will be slow by ~7%.
I don't think the computer will complain about having 30" tires. Your mileage may suffer simply due to the added weight though.
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Kyle-
2004 Rainier
1970 Chevelle - Resto
1974 K5 Blazer - Resto
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RE: tire recomendations? - 12/15/2006 9:44:50 PM
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20Blazer00
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Well unless you can reprogram the computer the larger tire size will affect part throttle operations since the rpm ranges for the larger size tires may not fall into the ranges that the computer will work with effeciently so it will try to readjust or use default settings which would cause loss of MPG in town and might increase on the highway since the larger tires have a longer rolling distance so gas mileage will increase... their are two ways to adjust this table one is the HyperTech III Power Programer or ask your local dealer if they can do this...my local Chevy Dealer won't...
< Message edited by 20Blazer00 -- 12/15/2006 9:50:19 PM >
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Mark
2000 Blazer LS 4dr 4.3L Auto
1999 Grand Am 3.4L 4dr SE2 - Traded
2000 Honda Odyssey 3.5L 5dr Mini-Van
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RE: tire recomendations? - 12/15/2006 9:58:35 PM
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swartlkk
Posts: 14472
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From: Waterloo, NY
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I don't believe the difference between a 28" tire and a 28.9" tire will cause those issues in any measurable sense. Maybe a jump from 28" to 30", but still, the difference would be minimal. Especially considering that the shift algorithms in the trans are adaptive. The computer will adapt to small changes.
It is better to have the proper setting in the PCM, but I don't think that it is imperative if the size is within +/-5%. And most dealers won't do this change due to liability.
As far as tire recommendations, I have always liked the Dunlop Radial Rover A/T and that is what I plan on putting on my Bravada. I'll be moving up from a P235/70R15 to a LT235/75R15.
< Message edited by swartlkk -- 12/15/2006 10:00:54 PM >
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Kyle-
2004 Rainier
1970 Chevelle - Resto
1974 K5 Blazer - Resto
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RE: tire recomendations? - 12/15/2006 10:08:42 PM
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skitzobmxr
Posts: 107
Joined: 12/12/2006
From: wisconsin
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those dunlops look like sumthin id buy, have u driven them in the snow...cuz i live in wisconsin and it does that about a third of the year
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RE: tire recomendations? - 12/15/2006 10:11:22 PM
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Hanr3
Wheels & Tire Moderator
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Lets keep this in perspective.
The computer doesn't know you have bigger tires unless you tell it you have bigger tires. It wont do anything different. Your mileage will change becuase your odometer is off, and your speedometer is also off. Nieher are a big deal, unless your pretty anal about monitoring your fuel mileage and running at the exact speed limit or at the very edge of getting a ticket.
3% is not enough to cause any real issues. Performance or otherwise. Instead of shifting at exactly 45 mph your actually shifting at 43.65mph. However, the puter doesn't know that your only going 43.65mph. It still thinks your going 45mph. Instead of crusiing at 65mph at 2000 rpms, your actually at 2000 rpms and going 67 mph. Again the puter doesn't know the difference. It still sees 200rpms, and 65 mph. The cop on the other end of the radar gun might not see it that way. So watch that speed. 
If that is a big deal for you, pay the .2 of a hour of labor rate at the dealer and have them reprogram the puter with the proper tire size. Or fork out hte $350 bucks for a programmer and do it yourself.
I myself watch my gas gauge, when it gets low, I add gas. Over 100,000 miles my odometer is off by 3,000 miles. I am not too worried about it.
Yes, you can lose fuel mileage due to larger tires, and thus more wind under the truck, loss of airodynamics. However this is a truck, not a sports car. Your airodynamics arent that great to begin with.  Besides, if you went from teh 235/75R15 to the 30" tires you gained a 1/2" more gournd cleanace. So now your at 8" instead of 7.5".
If we were talking about going from stock to 33" or bigger. yea, then it starts to become a concern. Although my '87 with the 2putt8 V6 engine and 33" tires doesn't complain unless I am on the interstate trying to do 60 on the speedo. Teh speedo only goes to 70 anyways. Not like the truck has much top end to begin with.
_____________________________
"Some people spend an entire lifetime wondering if they made a difference.
The Marines don't have that problem."
-President Ronald Reagan
'87 S10-Blazer - SOLD
'93 S10-Blazer 4x4x4 - Sons DD, engine swap is done.
'00 S10-Blazer 4x4x4 - My
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