Truck Boggs Down On The Line

[blacksheep4x4]

Truck use to run 1. 65 in the 60' now after adding the Silver bullet the time has slowed to 2. 75. I am running bthe Smarty on Level 8 and TS MP-8 on 90%. I have 90hp DD injectors, a 95gph FASS pump, 5" MBRP exhaust, AFE stage2 intake, Banks Airhorn, and SB DD clutch. I am launching the truck in 2nd gear at 2800 RPMs. The truck does have 35" tires with the 3. 73 gears. I also added a set of Caltracs. Any Ideas on how to get my 60' times back.



Thanks in advance.

 

[RobertP]

the difference now is that you dont have boost right away. im sure im going to suffer the same fate come this sat. the silver bullet takes some time to spool, also with the mods you have your dumping tons of fuel right off the line. the way to fix this is to learn how to build boost on the line. which is very tough with a six speed without redlighting.



i bet you that truck is a rocket once boost comes up though. i will be upgrading to a silver bullet here soon too. along with some added fuel. what are you running in the quarter with that set up?

 

[blacksheep4x4]

I thought I was getting more than enough fuel as well, but Brandon at Industrial Injection thinks I need more fuel. The truck seems like it is choking on fuel then when it coughs it all up it takes off like a bat out of hell. I was running 14. 7s with the stock turbo and now I am up 15. 8s with the the silver bulllet. The guys at Dynomite Diesel think I need to either go to a automatic trans or a smaller turbo like a 64 14. As far as spooling the SB on the line what do you do that works?

 

[RobertP]

the only thing i can say is try to use your right foot to hold the brake and push the fuel pedal at the same time. all while letting out on the clutch alittle to build some boost before the light turns. im going to find out on saturday how mine does. ive gone a best of 14. 3 at 98 mph. with the stock turbo and the BDDL CL tune. and my injectors. so im hopeing i can get a good launch and do ok. shifting is not a problem with me.

 

[blacksheep4x4]

I also forgot to mention the track I usually race is over 3000' above sea level.

 

[Tomeygun]

I assume launching in 3rd?

 

[TCDiesel]

The easy fix for that type of coughing is the rail, the CP3 volume is related to RPMs the injection system is not. . modded rails will give that edge that the factory rail cannot Provide. I could type a complicated explanation but it would be confusing to some. . the only offer I have try it and if you don't like it return it for a full refund.

 

[hotram03]

I'll back up Todd on the rail, I bought one and haven't had time to post, but off idle throttle response is UNREAL and thats all I can say, I cannot believe what this done for my truck, its a great product Todd, I hope B. Maynard has gotten in touch with ya, he's buying one because what I told him it will do, you guys running heavily modified, NEED this rail its some money WELL spent.

 

[RobertP]

I assume launching in 3rd?

no he's launching in second, at 2800 rpm. as per his first post.

 

[RobertP]

The easy fix for that type of coughing is the rail, the CP3 volume is related to RPMs the injection system is not. . modded rails will give that edge that the factory rail cannot Provide. I could type a complicated explanation but it would be confusing to some. . the only offer I have try it and if you don't like it return it for a full refund.

I am just not seeing how having a modded rail is going to keep the truck from not having any boost when leaving the line. honestly i can see it helping but it will not cure this issue. the bogging issue that i am seeing and what i assume he is having, is due to the dropping of the clutch and not having the air right away to burn the amount of fuel we are dumping off the line. i can see the modded rail aiding in spool up once the turbo has a chance to catch back up to the initial onslaught of fuel being dumped into the cylinders without the proper amount of oxygen to burn it.

 

[AMassaro]

How about a line loc system with the switch on the steering wheel? Lock all 4 wheels, easing off clutch should build boost at the line. I have trouble with my auto building boost at the line also. I'm either under 5lbs or over 20lbs, neither of which I want... .



Very hard to get off the line cleanly and consistently.

 

[JasonCzerak]

Even with my size 12 shoe, I can't manage to three peddle it. I have yet to get to the track with my truck since I was stock a few years back (I do have places come September!!). But with the stocker, 2500-2800rpm is about 2-3PSI and it's just enough to get the edge to fuel as soon as you dump the clutch and go.



This is where I want the Smarty to come in, more fuel quicker. My problem is if I get more fuel, I know I'll toast my turbo. Not a good thing



In the case of the bigger turbo, How would a line lock help out? I would expect you can lock the brakes and build boost off of that, and if your crafty mount the (additional) release button under the accelerator, giving you one last thing to do while you launch and instantly grab 3rd.



so long as it doesn't take 10 seconds to build 10-14PSI boost, you should be able to pre-stage, and as soon as you stage, lock the brakes, 1/2 engage clutch and idle up to 2500 rpm and as soon as the yellow comes on hit the accelerator to the floor to and drop the clutch at the same time and your off!



Hmm, this sounds like it will need some practice and a sacrificial clutch

 

[AMassaro]

Stand on the brake pedal, press and hold the line lock, release the brakes. Now the lock (your finger) is holding brake pressure. Modulate clutch and throttle to desired boost. I'd think with some practice, you'd be able to stage in the first beam, line loc and boost enough to touch the second beam to full stage then release line lock and mat the throttle... Sounds easy... :-laf

 

[TCDiesel]

I am just not seeing how having a modded rail is going to keep the truck from not having any boost when leaving the line. honestly i can see it helping but it will not cure this issue. the bogging issue that i am seeing and what i assume he is having, is due to the dropping of the clutch and not having the air right away to burn the amount of fuel we are dumping off the line. i can see the modded rail aiding in spool up once the turbo has a chance to catch back up to the initial onslaught of fuel being dumped into the cylinders without the proper amount of oxygen to burn it.

I here Ya,I could explain it or maybe its un-explainable ,although it work's and their always is some type of performance Gain, Robert Just send Me One (Core To mod) and Try it.

 

[blacksheep4x4]

TWest send me a pM with pricing for the modded rail. If it is not to spendy I'll try it. Brandon was saying that one of thier dual feed lines would also help maybe a combination of the two would work well.

 

[Tomeygun]

no he's launching in second, at 2800 rpm. as per his first post.

I figured anyone with a DD would launch in 3rd and just ride until boost is up...



Seems to wrok on the street - Course that way different when you forced to launch and not just leaving a will



I think the line lock idea is the best

 

[blacksheep4x4]

I tried to launch in 3rd before the turbo and the truck would bogg down. So I had to use 2nd gear.

 

[RobertP]

I figured anyone with a DD would launch in 3rd and just ride until boost is up...



Seems to wrok on the street - Course that way different when you forced to launch and not just leaving a will



I think the line lock idea is the best

i always thought that too until i tried it in a customers truck. i quickly learned just not enough instant boost to make it worth while, unless you are seriously modded with a nice set of twins then maybe it would be benificial to launch in third.



i do agree that the line lock idea has crossed my mind a time or two. but i only go to the track with my truck maybe once a year.

 

[Tomeygun]

i always thought that too until i tried it in a customers truck. i quickly learned just not enough instant boost to make it worth while, unless you are seriously modded with a nice set of twins then maybe it would be benificial to launch in third.



i do agree that the line lock idea has crossed my mind a time or two. but i only go to the track with my truck maybe once a year.

When I say launch in 3rd, I mean sledpulling style - like let out enough to get going quick, but not under 2200 rpms (about 2-3 seconds until full engagement).



Now that I think about though, the few times I have did it - It just blew the tires off anyway. I guess I could try it in 4x4...

 

[RobertP]

When I say launch in 3rd, I mean sledpulling style - like let out enough to get going quick, but not under 2200 rpms (about 2-3 seconds until full engagement).



Now that I think about though, the few times I have did it - It just blew the tires off anyway. I guess I could try it in 4x4...

with doing it that way. i have found you either redlight or lose too much time at the line. it very tough to get a 6 speed down the track very well. i really only have seen a select few who do it really well. bashee has got to be one of the best, along with jeff prince.