Starting line ratio ideal for 1000hp 1/4 mile
12-29-2016, 10:38 AM
#1
Starting line ratio ideal for 1000hp 1/4 mile So what's the idea slr for 1000hp on 275 tires?
I made 940rwhp, race weight 3400, 3.54 gear for qtr mile.
Thinking of changing transmissions.
2.48 th400 slr=8.78
2.10 th400 slr=7.43
1.80 glide slr=6.37
Which should Trans should I go? Does 3spd keep it in the powerband better, does the extra shift waste e.t.? Does glide use les hp? To heavy for a glide? Thanks for any wisdom?
I made 940rwhp, race weight 3400, 3.54 gear for qtr mile.
Thinking of changing transmissions.
2.48 th400 slr=8.78
2.10 th400 slr=7.43
1.80 glide slr=6.37
Which should Trans should I go? Does 3spd keep it in the powerband better, does the extra shift waste e.t.? Does glide use les hp? To heavy for a glide? Thanks for any wisdom?
12-29-2016, 07:42 PM
#2
Getting as close to 7.00 slr is probably the sweet spot for you. Is your car nitrous or turbo? I'd think you'd be happy with the 2.10 400. The 2.48 on a 275 is gonna be a lot to handle at the launch. PM me with any questions I happen to know a great trans guy in the drag radial and 275 classes
01-09-2017, 09:59 AM
#5
What tire slick or radial? That's going to matter more than the lower adder
Fwiw, with both systems onim lrobably Aron's the 1500hp range and I have a 2.1/1.4 th400 with a 4.10 rear, 29.5 tire.
With a slick and that rear enf gear I'd run a std 2.48 first th400, if on a radial I would put a 1.69 glide in the car.
Fwiw, with both systems onim lrobably Aron's the 1500hp range and I have a 2.1/1.4 th400 with a 4.10 rear, 29.5 tire.
With a slick and that rear enf gear I'd run a std 2.48 first th400, if on a radial I would put a 1.69 glide in the car.
01-13-2017, 01:22 PM
#7
TECH Enthusiast
We run a 1.86 first (RPM TH400) and have been 1.10 60' on a 275 pro. (400" ERL superdeck, GTX5518R)
The SR2 in the BS3 is still pulling power out even on very good surfaces. (0-6 deg for a few milliseconds here and there during the pass (depending on how aggressive the tune up is)).
It comes down to budget and what you're going to do with it.
I can guarantee that you'll have a ton of trouble trying to get it down the track in first with a 2.10 first gear. It'll have so much power out of it that it'll be hard to get clean passes. Remember that with radial cars, can't just ramp a ton of power out at low wheel speed. It will kick/spin the tires.
The SR2 in the BS3 is still pulling power out even on very good surfaces. (0-6 deg for a few milliseconds here and there during the pass (depending on how aggressive the tune up is)).
It comes down to budget and what you're going to do with it.
I can guarantee that you'll have a ton of trouble trying to get it down the track in first with a 2.10 first gear. It'll have so much power out of it that it'll be hard to get clean passes. Remember that with radial cars, can't just ramp a ton of power out at low wheel speed. It will kick/spin the tires.
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01-14-2017, 08:45 AM
#8
Find out soon enough car should go in the .teens
Slick tire and radial are totally different. Slick you need wheel speed,
I'm starting off with the shift light coming on .7 into the run fwiw, get the whee speed and pull 2nd almost immediately, and throw all the power right at it after the shift. Common slick tire practice, but a radial car would never work like this it would either try to flip over or blow the tires off.
I also run wheelie bars, which changes it all as well.
Slick tire and radial are totally different. Slick you need wheel speed,
I'm starting off with the shift light coming on .7 into the run fwiw, get the whee speed and pull 2nd almost immediately, and throw all the power right at it after the shift. Common slick tire practice, but a radial car would never work like this it would either try to flip over or blow the tires off.
I also run wheelie bars, which changes it all as well.
01-17-2017, 06:56 AM
#9
TECH Enthusiast
I've seen both happen haha
A lot of people try to pedal when the car is out there beyond 100'.
If you pedal a radial tire 9/10 it won't recover and you're better off aborting the run. I've seen several people whap the throttle when its barely moving.. kick the tires and slam into the wall. It's beyond me, having a driver who knows what to do in a situation like that is key.
As for us, if it sticks in the first 60' then it's going down the track. Unless the track has bad spots in it where it might want to drive left or right and have to lift.
Being able to read a track and how its behaving/acting is very helpful. if you can read and see that there's small bald spots on where the rear tires are, or marks out 80' where the rubber is balled up from FWD cars (WCF is bad about having spots where the FWD cars do the 1-2 shift). Being able to apply and control power/wheel speed at those kind of situations is very helpful. Being around these (radial) cars for a while you can learn what the car likes and how its going to behave.
01-17-2017, 09:25 AM
#10
I agree. I'm not around them as much as I am slick tire cars, our prep up this way can be inconsistent enough so racing on a radial is not something I've wanted to dabble in. I know track bald spots will move slick tire cars around but not to the extent that a radial tire car suffers from.
If the track is there I think a radial will be faster but if it's not and you have to manage the power back a bunch to get the radial to work, they may not be the best choice.
Fwiw I have an arc module being wired in, so I probably can manage the track for stuff like wcf, once I figure the thing out.
If the track is there I think a radial will be faster but if it's not and you have to manage the power back a bunch to get the radial to work, they may not be the best choice.
Fwiw I have an arc module being wired in, so I probably can manage the track for stuff like wcf, once I figure the thing out.
01-17-2017, 09:49 AM
#11
TECH Enthusiast
A radial is so much more stable than the slick. The sidewall helps out a ton. Even with the 28x10.5w Stiff sidewall slicks there's some deflection and the car moves around a lot.
WCF is an awesome event. The surface took all the power we could throw at it (still being mindfull and taking into consideration that its not a radial prep). It's more of a slick tire surface to help the import groups get down the track, just so happens we can make radials work on it.
I know that bruders and goss both went 4.40's there during the event, even in their 1/4 mile trim.
WCF is an awesome event. The surface took all the power we could throw at it (still being mindfull and taking into consideration that its not a radial prep). It's more of a slick tire surface to help the import groups get down the track, just so happens we can make radials work on it.
I know that bruders and goss both went 4.40's there during the event, even in their 1/4 mile trim.
01-18-2017, 05:47 AM
#13
TECH Enthusiast
Depending on what class you enter, there's a ton of cars in the Street Fighter class, like 80+
There was 23 or something like that in X/H (where we race), Palazzolo, Bruders, and Goss all went into the 6.80's and Hines went a 7.0x something. We took #6 with a 7.12 in qualifying. It's a fast event, where money brings out the fast cars. 5k to win is no chump change but beating up the engines in 1/4 mile racing is hard. It's defiantly a "war of attrition"
We had a boost controller problem in testing and the track held on 11psi off the hit... mind you, it went immediately into a wheelie... but it took it. Even for it being more of a slick tire prep.. the track was good. Very good.
There was 23 or something like that in X/H (where we race), Palazzolo, Bruders, and Goss all went into the 6.80's and Hines went a 7.0x something. We took #6 with a 7.12 in qualifying. It's a fast event, where money brings out the fast cars. 5k to win is no chump change but beating up the engines in 1/4 mile racing is hard. It's defiantly a "war of attrition"
We had a boost controller problem in testing and the track held on 11psi off the hit... mind you, it went immediately into a wheelie... but it took it. Even for it being more of a slick tire prep.. the track was good. Very good.
01-18-2017, 07:55 AM
#14
If I turn my junk up and the cars sorted out it will see somewhere in the 7.80 range, not enough for that class you're playing in... I built this for 8.50 index never really had any intent to try to go much past 7.90-8.0 no real need.
Motor upgrade plan should support 7.50 as we plan to try to get another 200-250 n/a HP out of it and be able to spray it with 2500 Pph which is about 800 more than I'm comfortable doing right now.... Couple that with the 250 lbs I still have to get out of the car and it should liven it up.
Why? I don't know, maybe run 8.50 n/a and spray it for events like that one. If I can set it up to take 2500 pph and have it run 8.5 without spraying it car should run pretty good, I would think
Motor upgrade plan should support 7.50 as we plan to try to get another 200-250 n/a HP out of it and be able to spray it with 2500 Pph which is about 800 more than I'm comfortable doing right now.... Couple that with the 250 lbs I still have to get out of the car and it should liven it up.
Why? I don't know, maybe run 8.50 n/a and spray it for events like that one. If I can set it up to take 2500 pph and have it run 8.5 without spraying it car should run pretty good, I would think
01-18-2017, 08:16 AM
#15
TECH Enthusiast
Street fighter, basically think NMCA Real street.. guys were going 7.30's in almost legal NMCA trim. Will make NMCA racing interesting this coming season.
01-18-2017, 10:28 AM
#17
TECH Enthusiast
01-18-2017, 02:23 PM
#19
TECH Enthusiast
01-18-2017, 09:11 PM
#20
Hmm. 540ci can weigh 3100 and has a 32 jet limit? What if I punch this out to a 565, or were to throw a crank in it, how big can the motor be before I am at the limit?
I need to see these rules more... I can see my pile being a good fit for that.
I need to see these rules more... I can see my pile being a good fit for that.