3rdGteg

Well I finally ran my car with my new b16 tranny with lsd and I noticed I can't get out of the hole without the engine bogging and whole car shaking. This is really messing up my 60ft times and e.t. overall. First I tried launching at around 3300rpm and noticed it bogged really hard so I gave 2500rpm a try and also lowered my crappy street tires to 21psi and it improved a bit but was still bogging. Next I went to like 2200rpm and it still bogged after dumping the clutch as with the others. Anyone with experience please advise....

ps: stock clutch and street tires; vtec at 5700rpm if that matters.

FSTASNTZ

Does it spin and bog, catch traction and bog, or just bog and go? If it was just bogging, and nothing else, I would try to launch a little higher than 3300. Take it to 3500, then 4000, till it starts to spin out of the hole, then back off a bit.
Or that is how I use to do it on street tires.


Jason

3rdGteg

Someone at the tracks that night told me to launch higher also, but I was scared of wasting a run (figured because I was too high thats why it bogged). Is it my lsd that's causing this? Because when I had my crappy LS tranny, it was easy getting out of the hole; now with this b16 LSD, it bogs like hell at similiar rpm.

2001TypeR

You gotta launch higher for sure, its the lsd and tires gripping and making the car bog, you have to use the high end power and launch high and keep it in its good powerband till it hooks up, then gun it....

TurboCRVTEC

uhh.. could be your running too rich.
thats what happened when I was messing with my vafc
and made it too rich obviously

SergEK

Launch at 4K+ , below that at the track youll bog for sure esp with an LSD.

You can balance the clutch take up to help with your launch but it wont last as long.

4500-5000 and just dump it.......if it dont stick.........get drag radials and lauch at 7000

3rdGteg

7000 on my stock clutch?

H22A_pOwer

Do you drop the clutch? DON'T DO IT! Try slipping...

3rdGteg

I'm still not too sure on how to "slip it." I guess it's harder to understand that without seeing it done. All I do is dump the clutch at a certain rpm and it sucks. I'm getting like 2.4's 60 footers even with my lsd. I'm bogging to dang much off the line and I thought it just does that instead of burning rubber now with this tranny so I did what I always do when I burn out, I launch at a lower rpm. So now I guess I'm just gonna try launching higher like everyone says until the tires start to burn out--maybe then it won't bog.

SIK IN DA HED

launch at around 4000rpms and feather into your launches.

jas0n

launch at 4-5k

practice feathering the clutch a lot

HXMan

Thats how I pulled a 2.2 on my street tires. Not great, but it was my best.

Launch at like 5k, and feather the clutch until your speed catches up to your rpms.

3rdGteg

How do I do that? Is feathering just like normal driving when you slowly release your clutch so your clutch would smoothly engage on regular streets, but when racing, the same theory but let go a little faster?

H22A_pOwer

EXACTLY!

3rdGteg

Wouldn't that tear the **** out of the clutch faster?

JICsube

(listinin in on good pointers)

superfuji57

From what i understand (and use as my current launch technique) aren't you supposed to rev to around your peak torque then feather? Which would be more around the 6k range.

With the peak torque technique....does anyone know if this should change when getting an lsd? or using drag radials?

SergEK

Wouldn't that tear the **** out of the clutch faster?

This is why I tell kids to dump it.........its easier to replace tires then it is a clutch.

Dumping allows you to 60' consistently by taking out a varialble like clutch balancing and LSD pickup.

Let the tires slip....save the clutch.....DUMP it on Drag radials.....but remember that you should launch at 4K+ because of VTEC as soon as you come out of the hole your already in VTEC......if you bog youll know as VTEC will crossover on your way to the 1/8 (not good, not fast)

The lower the pressure the higher youll have to launch.....as well as if you go open header vs. full exhaust.......full exhaust = higher launch

If you can, go open header and BFG drags launch at 6K and dump see what happens (2.0 60') and youll wonder why you ever used streets at the track

3rdGteg

my vtec is at 5700rpm, so dump it at like 6k? But I have street tires

G-reX

hold it at rev limiter and dump it .

3rdGteg

Nos King

Step up to the plate and buy a set of M&H slicks!!!!!!!!
Launch as high as u want. Also chip your ecu & if you
remove the speed limiter vtec will pop whenever u rev it up.
Even when you're at the line, so u will launch in VTEC it makes a
HUGE difference!!!! Good luck

P.S. don't worry about axles braking becuz I launch at 6500 w/ my
24"x8.5x15" M7H's it's great !!!!!! Stock axles, open diff. no LSD.
I ran 12.61@110.23 1.941 60 ft { i spun in 1st }

b16ahybrid

vtec will pop when you rev????? and from my understanding you cant launch in vtec because you need load,and motion (i believe you need to be traveling at 18mph or greater), so you can launch at the rpm that vtec engages but just not in it....

b16ahybrid

oh and to answer the question, just as most others have said, launch higher esp with a lsd.....2,200rpm is way to low.....try 4,500rpm or higher

SergEK

vtec will pop when you rev????? and from my understanding you cant launch in vtec because you need load,and motion (i believe you need to be traveling at 18mph or greater), so you can launch at the rpm that vtec engages but just not in it....


VTEC should come on the second you drop the clutch and lanch out of the hole. By the first 60 feet you should be already doing about 30 mph....you should be well into VTEC. You motor will have enough load when you launch and activate it....if not your lauching too low and bogging like crazy....launch at 5500 dump it....youll spin the tires but you will notice your trap speed will be higher vs. bogging.