Ordering 12bolt today - which gear?
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From: PURDUE
Ordering 12bolt today - which gear? Ordering myself a Moser 12bolt today finally. However, I can't decide which gear ratio to go with! 3.73 or 4.10? My overal plans for the car are bolt-ons and a 150shot, maybe a cam. I plan on running a 26-27 inch Hoosier tire. This is a street car, so I think 4.10s and a 150shot would be ludicrous on the street. However, I don't think 3.73s isn't enough gear for the track. Help me decide!
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From: Richmond,Va
Re: Ordering 12bolt today - which gear? if you dont think 3.73's are gonna be enough gear then get 4.10's!! <img src="gr_grin.gif" border="0"> i would think that if you planned on running at the track with that setup w/ the 150 shot and all i would recommend a 28' slick....sounds like your gonna be MPH pretty high and it may force you to shift to 5th if you have anything smaller.....just a thought
Thanks
Jay
Thanks
Jay
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From: Troy, AL
Re: Ordering 12bolt today - which gear? I assume this is an M6?
Ok, for the track I'll assume a trap speed of about 130 MPH with a 222 cam, bolt-ons, and a 150 shot. Let's also assume 28" slicks since, to really do this right, you're going to need alot of tire. <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" />
That puts you at about 5850 with 3.73s or 6400 with 4.10s.
I'd take the 4.10s.
Ok, for the track I'll assume a trap speed of about 130 MPH with a 222 cam, bolt-ons, and a 150 shot. Let's also assume 28" slicks since, to really do this right, you're going to need alot of tire. <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" />
That puts you at about 5850 with 3.73s or 6400 with 4.10s.
I'd take the 4.10s.
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From: Troy, AL
Re: Ordering 12bolt today - which gear? Oh yeah, if you really must go with a Hoosier 26" slick (they don't make a 27" slick), go with the 3.73s.
Again, if it were me, I'd go with 28s and 4.10s.
Again, if it were me, I'd go with 28s and 4.10s.
Launching!
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From: St. Paul, MN
Re: Ordering 12bolt today - which gear? [quote]Originally posted by Colonel:
<strong>Oh yeah, if you really must go with a Hoosier 26" slick (they don't make a 27" slick), go with the 3.73s.
Again, if it were me, I'd go with 28s and 4.10s.</strong><hr></blockquote>
Colonel, I could be WAY off with this, but would the 26" "swell" up to around 27" by the end of the run. I have no idea if I'm right or wrong, but it would make since, at least to me...
<strong>Oh yeah, if you really must go with a Hoosier 26" slick (they don't make a 27" slick), go with the 3.73s.
Again, if it were me, I'd go with 28s and 4.10s.</strong><hr></blockquote>
Colonel, I could be WAY off with this, but would the 26" "swell" up to around 27" by the end of the run. I have no idea if I'm right or wrong, but it would make since, at least to me...
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From: Iowa :-/~
Re: Ordering 12bolt today - which gear? [quote]Originally posted by Colonel:
<strong>I assume this is an M6?
Ok, for the track I'll assume a trap speed of about 130 MPH with a 222 cam, bolt-ons, and a 150 shot. Let's also assume 28" slicks since, to really do this right, you're going to need alot of tire. <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" />
That puts you at about 5850 with 3.73s or 6400 with 4.10s.
I'd take the 4.10s.</strong><hr></blockquote>
I'm at the same point but only with a 100 HP. Colonel do you think a person will be able to shift fast enough with a set of 4.10's?
With nitrous?
I was set on getting 3.73's this afternoon but with what you just said about trap speeds and what PSJ said today about my shift point
What PSJ said about my shift points
And my new cam I'm now wondering if 4.10's are right for me. They would help with running N/A. <img src="images/icons/confused.gif" border="0">
<strong>I assume this is an M6?
Ok, for the track I'll assume a trap speed of about 130 MPH with a 222 cam, bolt-ons, and a 150 shot. Let's also assume 28" slicks since, to really do this right, you're going to need alot of tire. <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" />
That puts you at about 5850 with 3.73s or 6400 with 4.10s.
I'd take the 4.10s.</strong><hr></blockquote>
I'm at the same point but only with a 100 HP. Colonel do you think a person will be able to shift fast enough with a set of 4.10's?
With nitrous?
I was set on getting 3.73's this afternoon but with what you just said about trap speeds and what PSJ said today about my shift point
What PSJ said about my shift points
And my new cam I'm now wondering if 4.10's are right for me. They would help with running N/A. <img src="images/icons/confused.gif" border="0">
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Teching In
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From: West Lafayette, IN
Re: Ordering 12bolt today - which gear? How many times will I have to repeat this again???
4.10s
4.10s
4.10s
4.10s
4.10s
am i clear Alex ??
call me sometime Headers should be ordered anytime this week <img src="gr_stretch.gif" border="0">
4.10s
4.10s
4.10s
4.10s
4.10s
am i clear Alex ??
call me sometime Headers should be ordered anytime this week <img src="gr_stretch.gif" border="0">
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Verdad Gallardo TECH Senior Member
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From: Troy, AL
Re: Ordering 12bolt today - which gear? [quote]Originally posted by Jacobi:
<strong>
Colonel, I could be WAY off with this, but would the 26" "swell" up to around 27" by the end of the run. I have no idea if I'm right or wrong, but it would make since, at least to me...</strong><hr></blockquote>
They will swell. By exactly how much I do not know. An inch sounds too high based on the comparing of actual trap rpm v/s calculated rpms that I've done. This swelling would vary somewhat with trap speed, tire pressure, rim width, and race weight.
However, when calculating RPMS across the line you must also take into consideration the fact that your actual speed across the line and what the timeslip indicates is different. Your actual speed is higher because the trap speed is the average speed of your last 60 ft.
I've found that usually, this tire swelling and trap v/s actual speed difference tend to cancel one another out for the most part.
<strong>
Colonel, I could be WAY off with this, but would the 26" "swell" up to around 27" by the end of the run. I have no idea if I'm right or wrong, but it would make since, at least to me...</strong><hr></blockquote>
They will swell. By exactly how much I do not know. An inch sounds too high based on the comparing of actual trap rpm v/s calculated rpms that I've done. This swelling would vary somewhat with trap speed, tire pressure, rim width, and race weight.
However, when calculating RPMS across the line you must also take into consideration the fact that your actual speed across the line and what the timeslip indicates is different. Your actual speed is higher because the trap speed is the average speed of your last 60 ft.
I've found that usually, this tire swelling and trap v/s actual speed difference tend to cancel one another out for the most part.
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From: Troy, AL
Re: Ordering 12bolt today - which gear? "I'm at the same point but only with a 100 HP. Colonel do you think a person will be able to shift fast enough with a set of 4.10's?
With nitrous?"
With 28" tires you're only looking at around 6300 even if you pull 128 MPH trap speeds. What kind of trap speeds do you expect (this would vary alot with raceweight and the amount of N2O that you spray among other things of course.)
They'll most definitely be better NA and will probably be better on the juice as well (you'd only turn around 5750 at 128 with 3.73s.)
Now, if going really big on the juice (much higher trap speeds and a lower RPM range) then 3.73s will better. 135 MPH with 4.10s on the bottle would not be good (6500+ rpm.)
With nitrous?"
With 28" tires you're only looking at around 6300 even if you pull 128 MPH trap speeds. What kind of trap speeds do you expect (this would vary alot with raceweight and the amount of N2O that you spray among other things of course.)
They'll most definitely be better NA and will probably be better on the juice as well (you'd only turn around 5750 at 128 with 3.73s.)
Now, if going really big on the juice (much higher trap speeds and a lower RPM range) then 3.73s will better. 135 MPH with 4.10s on the bottle would not be good (6500+ rpm.)