please help getting this boat out of the hole!
please help getting this boat out of the hole! I have been running this set up for years now and could not be happier with the twin turbo plan there is just one thing that is really disappointing and that is the hole shot. I am looking for some help on what would you do to make this big pig out of the hole. let me give you some details of the build.but before that i need to give you some info on what i do with the car. it is my daily driver in the summer I have road raced it a couple times,auto crossed it a dozen times and been to the drag strip a couple times now and I pull a camper trailer with it as well. so sacrifices have been made all around,the car still needs to pull a camper and be a daily driver as well so don't just tell me to put a 5,000 stall in it. here is some details of the build. it is a 5.3 stock bottom end with No rings regapped just stock with a set of hand ported 241 heads a 2002 z06 cam and a ls1 intake spoolin with a pair of 56/58mm precision turbos running 14#of boost on e85,4l80e trans with a ford 9" rear with 3:55 gears and 285 35 20 rear tires and a yank 3,400 pro multi disk convertor.
the car weighs a ton or should i say 4,700# so i realize that it will never be in the 1.5 sec 60' times but so far the best 60' time i have been able to get is 2.1 60' times and 11.99 time slip really hoping to get the car in the 10's .
the car is just a slug out of the hole for 15' then boost hits hard and i loose traction i can Not build any boost on foot brake.
what could i do different? heads,cam 2 step,boost controller?
the car weighs a ton or should i say 4,700# so i realize that it will never be in the 1.5 sec 60' times but so far the best 60' time i have been able to get is 2.1 60' times and 11.99 time slip really hoping to get the car in the 10's .
the car is just a slug out of the hole for 15' then boost hits hard and i loose traction i can Not build any boost on foot brake.
what could i do different? heads,cam 2 step,boost controller?
I can only muster a little over a 1 psi on the footbrake without my 2-step on. With the 2-step I have got it to make 7-8 lbs. at 3400 rpm. That's without changing anything in the tune to try and get it to spool harder too. Might as well give a 2-step a chance.
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Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
You have a 4L80e.
Run a sloppy transbrake. It'll cost you 10 bucks and an hour of your time. Locks the trans in 3rd gear on the line so you can hold it back with the footbrake and build lots of boost. Releasing it forces it to downshift into 1st and launch. All you need is a relay and a toggle switch or momentary button to tap into the trans wiring.
Cheaper and easier than a conventional transbrake, no need to modify the trans. Cheaper than a 2 step as well, which still won't help you if your car won't be able to hold the tires under boost on the line without pushing through the brakes. My car builds 12-14 PSI on a 2 step and shoves right through the brakes. Thankfully, I also have a 4L80e. I just use the 2 step to control RPM, not to build boost.
Run a sloppy transbrake. It'll cost you 10 bucks and an hour of your time. Locks the trans in 3rd gear on the line so you can hold it back with the footbrake and build lots of boost. Releasing it forces it to downshift into 1st and launch. All you need is a relay and a toggle switch or momentary button to tap into the trans wiring.
Cheaper and easier than a conventional transbrake, no need to modify the trans. Cheaper than a 2 step as well, which still won't help you if your car won't be able to hold the tires under boost on the line without pushing through the brakes. My car builds 12-14 PSI on a 2 step and shoves right through the brakes. Thankfully, I also have a 4L80e. I just use the 2 step to control RPM, not to build boost.
Tires are also a big part of the issue here I'd say. If it's starting to spin the tires when you are out a ways that's worth quite a bit. Spare set of even 18"s with a drag radial along with 2 step and it'll pick up a bunch. I agree at only 122 it's going to take a pretty good 60' to get it down there. But if it doesn't spin and can leave on a little boost you'd probably pick up some MPH as well.
We are putting together a somewhat similar set up other then a single on my buddy Dan's 4 door 69 Caprice on Ride Tech coilovers. I think you may have seen that. I know he's talked with you on facebook a few times. Hopefully we'll have his together soon and he's going to try some radials.
We are putting together a somewhat similar set up other then a single on my buddy Dan's 4 door 69 Caprice on Ride Tech coilovers. I think you may have seen that. I know he's talked with you on facebook a few times. Hopefully we'll have his together soon and he's going to try some radials.
Not to be a downer, but I think you are asking for too much out of your setup. With 122mph trap speed, the car is not making a crap ton of power. So let's look at the facts: not a powerhouse combo, 4700#s, low pro non drag tires, and no way to make power on the line. Yep, you aren't going to hit 10s like this.
Like said above, look into a 2 step. Would help a lot. Then I would get a good tire on it.
Like said above, look into a 2 step. Would help a lot. Then I would get a good tire on it.
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I was looking at the right side of your time slips 60' and was thinking a 1.8 isn't horrible. Then I saw the 2.23, that isn't so hot. I second the sloppy trans brake, but without drag radials you're just going to smoke the tires. The mph isn't enough for 10's as is but throw 5 or 6 more lbs at it and you'll get your 10.99. If your e85 is 70% or more ethanol you'll have the octane to keep from detonating, as long as you go soft on your timing.
So basically, sloppy trans brake, drag radials and 20 lbs of boost you should get your 10's!
So basically, sloppy trans brake, drag radials and 20 lbs of boost you should get your 10's!
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Verdad Gallardo Thanks everyone for the input my first priority is tires for sure. never even gave a trans brake idea a thought? i was still under the impression that trans brakes were not for street use i will have to look into the sloppy fix! just curios what you guys think of the boost limit with stock ring gaps?
lol. you will not get there with 122mph trap speed.lol pretty sure that will change with a better 60' times and more boost.!
my compression ratio is only about 9.5 to 1 so one would assume that bumping that up would wake it up on the low end as well.but that might be later.
lol. you will not get there with 122mph trap speed.lol pretty sure that will change with a better 60' times and more boost.!
my compression ratio is only about 9.5 to 1 so one would assume that bumping that up would wake it up on the low end as well.but that might be later.
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Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
A typical transbrake is a major mod. In most cases you have to replace the valve body in the transmission with one setup for a trans brake. Sometimes, other mods are required. They're not cheap either. Usually around $450 for a standard 80e transbrake. They lock the transmission in first gear and reverse at the same time, so that it will not move. Releasing the brake releases the reverse, causing it to launch.
The sloppy transbrake just forces it into third gear, using nothing but a relay and a switch. You use your brakes to hold the car still in 3rd gear. Releasing the switch downshifts into first. My car stalls to about 2600 and 2-4 PSI on a prepped surface before it pushes through my crappy brakes. In 3rd gear, it stalls to 4500 and 16 PSI on the street.
I would still get some real tires before I attempted the sloppy brake..
The sloppy transbrake just forces it into third gear, using nothing but a relay and a switch. You use your brakes to hold the car still in 3rd gear. Releasing the switch downshifts into first. My car stalls to about 2600 and 2-4 PSI on a prepped surface before it pushes through my crappy brakes. In 3rd gear, it stalls to 4500 and 16 PSI on the street.
I would still get some real tires before I attempted the sloppy brake..
Your ET / MPH computed from your vehicle weight of 4700 pounds and HP of 700 is 10.99 seconds and MPH of 122.98 MPH.
Looks like the Wallace Calculator thinks 122 mph could get you to a 10.99
Looks like the Wallace Calculator thinks 122 mph could get you to a 10.99
4700# isn't the issue nor that heavy. Stock48 has pulled 1.3x in his 4850# truck.
If you're running vacuum assist brakes, consider swapping to hydroboost
And put some Mickeys on it. Those rubber bands are killing you
If you're running vacuum assist brakes, consider swapping to hydroboost
And put some Mickeys on it. Those rubber bands are killing you
^^^ "And put some Mickeys on it. Those rubber bands are killing you"
Added to this>>>suspension set up to xcross, etc, is not allowing the chassis to work. I'd bet a video would show virtually no pitch rotation.
Added to this>>>suspension set up to xcross, etc, is not allowing the chassis to work. I'd bet a video would show virtually no pitch rotation.
well scored some new Hoosiers and some 15" centerlines this weekend. so hopefully they will fit over my brakes! but that is not the problem out of the hole ,but will be if i can make boost out of the hole .it definitely was as soon as boost kicks in . at 12# even on the street it would hook everything it had even with these tires but 13# was a whole different story. going to try a 2 step and perhaps a sloppy trans brake.