Need some help gearing question.....
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From: Albuquerque, NM
Need some help gearing question..... I know this is the wrong forum, but hey it has to do with FI somewhat and I get the best help here anyway sooooo.
Well its time to replace the ol 3.73's they've had it and are whining, groaning, and making the car vibrate bad. I know from my launches that the ol crush collar crushed even more, and the pinion is now out of spec bad.
With that said,
What gear should I go with now???? 3.73's again -OR- 4.10's?
From a calculator that I've been messing with, it says optimum gear for my car would be a 4.08, but since that won't happen I will round up to 4.10's.
I am looking for 10's all else comes second at this point. I have loved my 3.73's and would never go to a 3.42 or 3.23's as our cars up here need all the mechanical advantage that they can get lol.
I have a big cam, big 3800 Vigilante TC, and the s/c wants to be spun up fast too I'm making around 570-600rwhp....guesstimate from my former maxed out 42.5's(hershey enjoy them
)
I run a 26 inch ET street, but want to step up to a 28 after these 26's are done. So what gear should I go with??? I need to get some quick as the 3.73's that are in there now are going to go anytime....sounded exactly like my last set that bit the dust lol.
I'm really wanting to go 4.10's because I feel they will put the car in its powerband a whole lot sooner and get me down the track a few precious tenths faster.....but the drawback is hooking will be a BIOTCH at our already non hooking, ill prepped track.
Give me some input guys.
J
Well its time to replace the ol 3.73's they've had it and are whining, groaning, and making the car vibrate bad. I know from my launches that the ol crush collar crushed even more, and the pinion is now out of spec bad.
With that said,
What gear should I go with now???? 3.73's again -OR- 4.10's?
From a calculator that I've been messing with, it says optimum gear for my car would be a 4.08, but since that won't happen I will round up to 4.10's.
I am looking for 10's all else comes second at this point. I have loved my 3.73's and would never go to a 3.42 or 3.23's as our cars up here need all the mechanical advantage that they can get lol.
I have a big cam, big 3800 Vigilante TC, and the s/c wants to be spun up fast too
I'm making around 570-600rwhp....guesstimate from my former maxed out 42.5's(hershey enjoy them ) I run a 26 inch ET street, but want to step up to a 28 after these 26's are done. So what gear should I go with??? I need to get some quick as the 3.73's that are in there now are going to go anytime....sounded exactly like my last set that bit the dust lol.
I'm really wanting to go 4.10's because I feel they will put the car in its powerband a whole lot sooner and get me down the track a few precious tenths faster.....but the drawback is hooking will be a BIOTCH at our already non hooking, ill prepped track.
Give me some input guys.
J
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From: Albuquerque, NM
Or I can go with 27's 
I'm guessing here but I would say 6800 as thats when it feels like it stops pulling. I haven't been to the dyno since early this summer and a ton of things have changed. Rev limit is 7150. I trap 124mph.
Thanks Chris
J
I'm guessing here but I would say 6800 as thats when it feels like it stops pulling. I haven't been to the dyno since early this summer and a ton of things have changed. Rev limit is 7150. I trap 124mph.
Thanks Chris
J
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From: Albuquerque, NM
Third should be good for 130-3mph traps if I remember right, so I should be well with in that range with my auto.
Frank, got some more goodies.....
They will be going in tomorrow.
Now back on topic, keep the info and sugg's, advice etc coming.
J
Frank, got some more goodies.....
They will be going in tomorrow.
Now back on topic, keep the info and sugg's, advice etc coming.
J
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With 27inch tall tire, 4.11s, 7200rpm comes in at 141mph NOT factoring converter slippage. With a 95% efficient converter you'll be around 133.5mph with that setup at 7200rpm. If you are making peak power at 6700rpm that works out about perfect. (Crossing the traps about 500rpm past power peak)
I would seriously consider the 28x9x15 ET drag. It is 27.3 inches tall and will MURDER an ET street traction wise.
I would seriously consider the 28x9x15 ET drag. It is 27.3 inches tall and will MURDER an ET street traction wise.
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Originally Posted by frcefed98
Third should be good for 130-3mph traps if I remember right, so I should be well with in that range with my auto.
Frank, got some more goodies.....
They will be going in tomorrow.
Now back on topic, keep the info and sugg's, advice etc coming.
J
Frank, got some more goodies.....
They will be going in tomorrow.
Now back on topic, keep the info and sugg's, advice etc coming.
J
looks like you'll have enough gearing with the 4.10's and room to spare. doooooo eeeeeiiiiiitttttt!!!!!
Originally Posted by Chris ARE 385
With 27inch tall tire, 4.11s, 7200rpm comes in at 141mph NOT factoring converter slippage. With a 95% efficient converter you'll be around 133.5mph with that setup at 7200rpm. If you are making peak power at 6700rpm that works out about perfect. (Crossing the traps about 500rpm past power peak)
I would seriously consider the 28x9x15 ET drag. It is 27.3 inches tall and will MURDER an ET street traction wise.
I would seriously consider the 28x9x15 ET drag. It is 27.3 inches tall and will MURDER an ET street traction wise.
I agree with Chris about them hooking but you guys have to remember that even though a A$ hits softer on the launch Jer is still running a stock 10 bolt like me........ we are going to be in the stock 10 bolt 10 sec club Jer........
Kyle
Originally Posted by frcefed98
Third should be good for 130-3mph traps if I remember right, so I should be well with in that range with my auto.
Frank, got some more goodies.....
They will be going in tomorrow.
Now back on topic, keep the info and sugg's, advice etc coming.
J
Frank, got some more goodies.....
They will be going in tomorrow.
Now back on topic, keep the info and sugg's, advice etc coming.
J
Oh awsome that you got them....... tune in tomorrow also??????? Track Friday????
Thread Starter
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From: Albuquerque, NM
Chris that's what I'm talking about. Yep will be moving up to the 28's. Will the 28x9x15's Drag fit my 15x10 prostar(7.5 BS) ? I used a ET drag last season for a few passes and got my best 60's to date with them.
Frank, yeah sure or yes sir? Supertroopers rule
Kyle, 10 bolt club we are. I will push this lil 10 bolt until it shatters and falls to pieces, if I can't repair it.....then the almighty 12 bolt will go in. But if only the gears keep failing then I'm alright....I might have to beef the axles up some tho
I have a file already made for the 60's, lets see how well I'm learning edit so far I'm doing better than the "tuners" so far, best 1/4 and MPH to date was on my tune.
As for the track, nope these gears won't last on a half way crappy launch....they are that bad. So it will be about a week until I hit the track again depending on how quick I get the gears. I'll be doing the install, I took the car to the dynoshop and he said nope only do mustangs no chevy's
Nobody wants to help out these days even if money is involved. These times suck.
J
Frank, yeah sure or yes sir? Supertroopers rule
Kyle, 10 bolt club we are. I will push this lil 10 bolt until it shatters and falls to pieces, if I can't repair it.....then the almighty 12 bolt will go in. But if only the gears keep failing then I'm alright....I might have to beef the axles up some tho
I have a file already made for the 60's, lets see how well I'm learning edit so far
I'm doing better than the "tuners" so far, best 1/4 and MPH to date was on my tune.As for the track, nope these gears won't last on a half way crappy launch....they are that bad. So it will be about a week until I hit the track again depending on how quick I get the gears. I'll be doing the install, I took the car to the dynoshop and he said nope only do mustangs no chevy's
Nobody wants to help out these days even if money is involved. These times suck.J
Thread Starter
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iTrader: (16)
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From: Albuquerque, NM
with the 3.73's the car doesn't really wake up until past the 1/8mi and then it hauls ***. I want the car to wake up before the 1/8 and really get moving towards the traps. It looks like i'm leaning towards 4.10's so far.
Can't be anyworse than driving around with a TH-400 and no overdrive??
J
Can't be anyworse than driving around with a TH-400 and no overdrive??
J
Originally Posted by frcefed98
Chris that's what I'm talking about. Yep will be moving up to the 28's. Will the 28x9x15's Drag fit my 15x10 prostar(7.5 BS) ? I used a ET drag last season for a few passes and got my best 60's to date with them.
Frank, yeah sure or yes sir? Supertroopers rule
Kyle, 10 bolt club we are. I will push this lil 10 bolt until it shatters and falls to pieces, if I can't repair it.....then the almighty 12 bolt will go in. But if only the gears keep failing then I'm alright....I might have to beef the axles up some tho
I have a file already made for the 60's, lets see how well I'm learning edit so far I'm doing better than the "tuners" so far, best 1/4 and MPH to date was on my tune.
As for the track, nope these gears won't last on a half way crappy launch....they are that bad. So it will be about a week until I hit the track again depending on how quick I get the gears. I'll be doing the install, I took the car to the dynoshop and he said nope only do mustangs no chevy's Nobody wants to help out these days even if money is involved. These times suck.
J
Frank, yeah sure or yes sir? Supertroopers rule
Kyle, 10 bolt club we are. I will push this lil 10 bolt until it shatters and falls to pieces, if I can't repair it.....then the almighty 12 bolt will go in. But if only the gears keep failing then I'm alright....I might have to beef the axles up some tho
I have a file already made for the 60's, lets see how well I'm learning edit so far
I'm doing better than the "tuners" so far, best 1/4 and MPH to date was on my tune.As for the track, nope these gears won't last on a half way crappy launch....they are that bad. So it will be about a week until I hit the track again depending on how quick I get the gears. I'll be doing the install, I took the car to the dynoshop and he said nope only do mustangs no chevy's
Nobody wants to help out these days even if money is involved. These times suck.J
hmmmm my thought is that FI cars dont need much gear but maybe thats just turbo cars. Look at Mightymouse...he has like 3.50 gears....I got 3.23 (removed 3.42 to put them in) Mike Brown had like a 3.50 gear as well. What does your time/speed calculate to at sea level?
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From: Downers Grove,IL
I like to spin my blower for earlier boost and get the power in nice and early so I don't need a lot of gear. I keep my rev limit at 6400rpm which helps keep things together longer. Heck I was running 125+mph traps with 2.73 gears at close to 3700lbs on a **** poor tuneup. I like less gear and more midrange. Parts last a lot longer which is of major importance to me with my family man budget.
I now have 3.50's in a 9". These seem to be about perfect. But I have yet to run the car at the strip with them.
Steve
I now have 3.50's in a 9". These seem to be about perfect. But I have yet to run the car at the strip with them.
Steve
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From: East Side Performance! mASShole
ok, heres my opinion. get rid of the **** in the 10 bolt and replace the guts with a spool made for the 10 bolt. you will see HP gains do to less rotating mass, and brakage will be a thing of the past! also you could get a set of say 3.90's (an inbetween gear) instead of the big jump from 3.73-4.10 that the 10 bolt is limited to. you will run faster and the rear will be good and strong.
I had great luck with my 27 x 11.5 hoosier QTP on my 10" wide bogarts. they hooked well, looked great and they had a true 27" x 11.5
and didnt rub at all beside on the inside but a hammer took care of that.
i know with my 3,400 stall in the th-400 shifting at 6600 with a true 27" tire and 3.73
i was out of gear at the 1,000' mark but staid into it. next time out i will go to 6,800 with a 28" tire i should go 140 if i spray out of the hole. so im sure at 600 rwhp in your car 130 should be no problem with traction!!! might want to think 3.73 or 3.90's
good luck you tuning fool.
I had great luck with my 27 x 11.5 hoosier QTP on my 10" wide bogarts. they hooked well, looked great and they had a true 27" x 11.5
and didnt rub at all beside on the inside but a hammer took care of that.
i know with my 3,400 stall in the th-400 shifting at 6600 with a true 27" tire and 3.73
i was out of gear at the 1,000' mark but staid into it. next time out i will go to 6,800 with a 28" tire i should go 140 if i spray out of the hole. so im sure at 600 rwhp in your car 130 should be no problem with traction!!! might want to think 3.73 or 3.90's
good luck you tuning fool.
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From: Downers Grove,IL
ok, heres my opinion. get rid of the **** in the 10 bolt and replace the guts with a spool made for the 10 bolt. you will see HP gains do to less rotating mass, and brakage will be a thing of the past!
was that a typo??nobody makes 7.5" full spools and even if they did it's still a tiny little weak rear end so breakage will always be a concern.
I would run the 3.73s.
The 28x9x15 ET drags are really better on 8" rims, I cut a 1.435 60' with those tires with 3.70 gears and I only had a 2.75 1st gear in the trans as opposed to your 3.06 1st gear.
I also ran 10.74 (1.480 60's) on 10.5x27x15 ET streets on a decent track but the ET drags outhooked them by a large margin on a crappy local track.
Stock springs and shocks on my car also so the whole suspension was pretty much the tire
BTW, some hacking will be involved for most 'real' 28" tall 10" wide slicks. The 9x28 ET drags are only a little over 27 so no hacking involved. Plus the less tire you drag down the track with you the better. Keep the 10" wheels for some big ET streets to cruise on and and find a set of used 15x8 5.5BS prostars and drill and screw them. I'm pretty sure on a good track I could have got in the 9's on the 9X28X15 ET drags on stock shocks.
The 28x9x15 ET drags are really better on 8" rims, I cut a 1.435 60' with those tires with 3.70 gears and I only had a 2.75 1st gear in the trans as opposed to your 3.06 1st gear.
I also ran 10.74 (1.480 60's) on 10.5x27x15 ET streets on a decent track but the ET drags outhooked them by a large margin on a crappy local track.
Stock springs and shocks on my car also so the whole suspension was pretty much the tire
BTW, some hacking will be involved for most 'real' 28" tall 10" wide slicks. The 9x28 ET drags are only a little over 27 so no hacking involved. Plus the less tire you drag down the track with you the better. Keep the 10" wheels for some big ET streets to cruise on and and find a set of used 15x8 5.5BS prostars and drill and screw them. I'm pretty sure on a good track I could have got in the 9's on the 9X28X15 ET drags on stock shocks.
Last edited by kp; Sep 8, 2004 at 10:35 AM.