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I finally got the coupe out and went onto the highway to see how it would do. All went well, nice smooth ride, no shakes or rattles / noises. Even the exhaust was real smooth! I was worried that it would drone and cause me major annoyances.
My only "concern" was the engine rpm at 65 was a touch over 2500 rpm. Do you guys consider this to high? the current combo uses an AOD with 3.90 gears. Tires I think were 38" tall...
Anyway, what do you think?
Not sure need some pictures of the HotRod for a definitive answer:D, but 65 @ 2500 not bad. I think my 99 Silverodo runs around 1800 @ 65, your within 700 Rs. Are you sure 38in tires ? Useing a standard most run on a street rod, a set of 15'' wheels with MTs are only 28'' tall. On the rear I run 15in rims with MT ET street radials they are a tall tire @ 30''.
What's your worry if I can ask?
A 38" tire? with your AOD should be running down the road at about 15 or 1600 rpm at 65mph.
A 28" tire should be spinning around 2200. Measure your tires to verify
No, not certain on tire height.. it could've been 28"... CRS ya know?..
I agree that it isn't to bad.. I'm thinking I'd like to see it closer to 2 grand tho..
Here's a pic of the car from this past winter.
In OD in my AOD with 4R gears 26.5 tires with 3.90 gears turning about 2500 here at 70.
What's 4R?Quote:
Originally Posted by turbo2256b
34_40
Hey liking the color you have good taste, please show some more as you go. I think he's saying 4 speed .. 4 gears.
Any temp issues running it at 2500??. I am just thinking what drew your attention to the rpm??. At 2500,with the right cam,you just cracking into the bottom of the power curve. That's a good thing.
I took mine out on the freeways this past weekend and it was cruising at 65mph @ about 2500 rpm and I have 4:11 gears.
Mike - that's about right. Mine - 3.25 gears, no OD, 29.1" tall Dunlop tires, corrected speedometer, at 65 is right at 22-2300RPM
I like to rpm a small block, keeps them healthy. Beautiful car. Is that the same rear tire as in the photoraph? They aren't tall at all, you could go up in tire size. If you have big block with some torque and taller tires than what is in the pic then i'd be thinking serious about regearing, get it to cruize at about 1800, 2K tops. If small block i'd let it go.
I don't know about good taste! LOL.. more like good luck... :LOL:Quote:
Originally Posted by pepi
I walked into the paint store and started flippin' through color chip book. The lady asked "do you have a color in mind?" I said "Nope"... then I pointed to this one. It's a GM fleet color, no name - just a number! :HMMM:
4R = 4 speed / 4 Gears... Hmmm.. maybe...
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Originally Posted by 1gary
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Originally Posted by 1bad32
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Originally Posted by IC2
WOW, Thanks for all the input and compliments! :3dSMILE:Quote:
Originally Posted by ojh
No, no temp issues and no concerns, just doing the ol' "compared to" routine I guess.
Yes, the tires are the same front and rear and I had planned to raise the rear tire size after more "shakedown runs".
Again, thanks for all the input!
[QUOTE=34_40;473253]I don't know about good taste! LOL.. more like good luck... :LOL:
I walked into the paint store and started flippin' through color chip book. The lady asked "do you have a color in mind?" I said "Nope"... then I pointed to this one. It's a GM fleet color, no name - just a number! :HMMM:
"4R = 4 speed / 4 Gears... Hmmm.. maybe..."
Hotrod lingo one never knows it was a guess, as to "more like good luck" I could use some of that for the lotto. :D
[QUOTE=pepi;473264]You and Me both brother!!:LOL::rolleyes::LOL:Quote:
Originally Posted by 34_40
I have a 700R4 with 3.89 rear gears and 30 inch rear tires. At 70 mph, my tach reading is just under 2200 rpm. I wanted to be able to cruise at 70-75 on the Interstate and get decent mileage, so that is why I chose this combination. I would say 2500 rpm at 65 mph is a pretty good combination.
Mike,Quote:
Originally Posted by 34_40
Something's wrong with your numbers. That AOD has a 0.67 to 1 OD ratio, right? If you're running 3.90 rear gears in OD a 28" tall tire would have you at 2,038rpm at 65mph. To get it up to 2500 in OD would be something in the range of 22"diameter on the tire. Were you maybe not in OD? At a 1.0 ratio in third a 33" tall tire would have you cranking 2581rpm. Sure your tach is right? Using a "fudge factor" to get the units right, RPM = (MPH x Gear Ratio x 336 x Final Drive Ratio)/Tire Diameter in inches (65mph x 3.9 x 336 x 0.67)/28" = 2038rpm. If you're in third, (65 x 3.9 x 336 x 1) = 3042rpm. Something's not right here.
Do you maybe have an AODE? That has a 0.7 OD ratio, which would put your numbers a little higher, but still not matching up with your 2500rpm at 65mph intro.
Thanks Roger! Here's what I know to be fact.Quote:
Originally Posted by rspears
A = rear is 3.90:1 ratio
B = Tranny is a "91" AOD and I can count the shifts, so I know it's in "4th" (od).
C = Tires ??? I don't know the diameter. I'm in a hotel in central mass but I'll be home friday evening so I'll measure that over the weekend.
D = Gauges... HMMMmmm.. I hadn't considered they may be "mis-calibrated".. esp. the tachometer, I have no reason to doubt it..:HMMM:
OK, the AODE applications list is the 1992–1994 Lincoln Town Car, 1991 and up Ford F-Series Truck, 1993–1994 Ford Crown Victoria, 1993–1994 Mercury Grand Marquis, and 1994–1995 Ford Mustang which means unless your tranny came from a truck it's an AOD with the 0.67 final drive ratio. Do you recall what size your rear tires are, like 255R15, or 225R15 or whatever?Quote:
Originally Posted by 34_40
No.. CRS.. When I get home friday I'll try to get to the shop and get some data for us.. THANKS!Quote:
Originally Posted by rspears
OK, I understand CRS but it's SUNDAY! :confused::confused: You've been back since Friday night, and still haven't remembered to put a tape next to those rear tires so we can sort out this business of your rpm's. :p:LOL::LOL::LOL:
I'll have to hang my head in shame... I WAS at the shop and walked by the car a dozen times but we had our excavator go down and it had to be ready for monday morning.. 2 days soaked in hydraulic oil and grease.. :mad:Quote:
Originally Posted by rspears
I can't wait to go back to work 'cause I need the rest! :p
I will try and run back tomorrow before I leave for central MA., then we can hammer it out! Thanks for your patience! :rolleyes:
:LOL::LOL:Jus' pullin' your chain, Mike!;) Ya' gotta take care of the important stuff, or things come to a halt while you're traveling. It'll get figured out one of these days. Travel safe next week!!Quote:
Originally Posted by 34_40
Just remembered that my wife is flying out tomorrow for Connecticut, hooking up with a couple of early childhood girls from her neighborhood, and they're going up to a B&B in Maine (can't recall the town) for a few nights to catch up after too many years. Looks like the weather should be great for them!!
Thanks Rog... :)Quote:
Originally Posted by rspears
Your wife from CT originally?
Nope, three little girls from Leawood, Kansas (suburb of KC). One ended up in Connecticut, one in California, and we're still in the KC Metro. The Cali gal didn't want to get together in California; the Connecticut gal didn't like the idea of coming back to Kansas; so KS and CA are flying to CT. Crazy logic, but two of three were going to be traveling, and my gal loves to travel. Oh, and they're headed to Rockland, on the coast.Quote:
Originally Posted by 34_40
That's cool! I hope she enjoys her trip and time with friends!Quote:
Originally Posted by rspears
Roger, currently 25.5" height... my new target will be 27.5" tall...
OK, with a 25.5" tall tire, 3.90 gears in 4th with an AOD (0.67 OD Ratio) you're cranking 2238rpm at 65mph, give or take a few rpm for tire inflation. When you shift to 27.5" tall tires (which is around a 225 75R 15), you'll drop to 2075rpm, again at 65mph. If you're showing over 2500 it sounds like you've got a bit of tach offset/error.
OK, Thanks Bud! I had an evening client meeting with my boss and on the way back home (just got in a few minutes ago) I was thinking I can verify my speedometer by comparing it with my gps! One of them (or both) may be off just a bit... Maybe next weekend I can do that cross check with the GPS.Quote:
Originally Posted by rspears
Yeah, you're right that it could be the speedometer that's running slow vs the tach being high. Duh! I didn't even consider that side, and checking it with the GPS is a great idea. I do that all the time in the Jeep, checking the "real" speed.
Forest for the tree moment huh?!?! LOL..
Just wanted to give you an update. I did go cruising yesterday and brought the gps with me and I can say my speedometer is really quite accurate! But I gave the rpm's wrong as it's really at 2400 rpm. Analog gauges aren't very specific are they?? :LOL:Quote:
Originally Posted by rspears
almost forgot to add, I had my first OH S _ _ T! while cruising yesterday too. Some old guy shoots out of his driveway and turns into my lane in front of me. Good thing my brakes work well!!!