Previously i have a OEM GSR trans in my ls-vtec set up and was able to manage a best of 11.2 with it. Recently i switch to a b16 with a quiafe lsd and i noticed that my 330' is about .2-3 tenth slower and my 1/8th mph also drop quite a bit which is hurting my 1/4 times.


GSR trans: B16 Trans:
1.72 60 1.74
4.92 330 5.219
7.40 660 7.78
110.63 mph mph1 96.43 mph
9.52 1000 9.90
11.29 1320 11.59
127.63 mph mph2 136.41

As you can tell the GSR trans was on pump gas set-up making a lot less power while the qauife b16 is on race gas and trap 10 mph more yet running slower times.

Any opinion is appreciated, thanks

 

Same track? Similar running conditions, tires, temp, etc.?

 

Same track same tires

here are the condition

GSR: 75.2F Hum:79% Wind MPH:4 Dir: 22 degree(headwind)
B16:83.3F Hum:40% Wind MPH: 5 Dir: 225(Tailwind)

 

something is up the way you come out of the hole, because what you posted is that you are picking up 40 mph on the big end of the track. Are you spinning tires a whole lot at first with the B16 transmission?

what wheels/tires were used on each run?

136 trap is good for mid 10's if you can hook up.

 

i would say more spin in the first half due to more power and shorter gearing

 

Short track is definetely slower due to wheel spin. You need better slicks for your power. What size are you running?

 

Im running 24.5x8.13 MT slicks, i know my driving is not the greatest and im trying to work on that unfortunately the motor spun a rod bearing during the last pass.

 

Something is up with that 127 trap and 110mph in the 1/8th.... i find it hard to believe you only picked up 17mph...

i agree with everyone else tho, more tire spin in the lower half with the B16 trans... from my experence the trap in the 1/8 goes up when your traction is better...

 

Here is another one with the gsr trans:

1.875 60
5.021 330
7.500 660
106.13
9.604 mph1
11.373 1320
126.87 mph2

On the pump gas, it look like i only pick up around 20 mph from the 1/8th to the 1/4 but on race gas it show i pick up 38-40 mph

 

Traction seems to be the issue. What rpm are you leaving the line at with the GSR tranny? B16 tranny? What tire pressure are you running?

 

At your trap speeds the car isnt making enough power to really make a difference. With 450whp and a b16 trans I was trapping in the 126 range and I had better short times than either of those and only going through the 1/8 @ 102mph, this was on Toyo 25x9's though. There is just some inconsistency there and I dont think the tranny is really making the difference. If your really going 110 in the 1/8 you should be in the higher 6's.

 

The difference between the 1/8th between the gsr on pump gas and b16 on race gas is huge. i have 3 slip and they all are the same

GSR pump gas 435whp 7.50@106.13, 7.53@105.78, 7.50@107.15

B16 on race gas( unsure on whp but it trapping 137) 7.74@98.80, 7.78@96.43, 7.91@96.05

So basically with about 100whp (esitmate)more HP, im running about .2-.3 slower in the 1/8th and 10 mph less while 60ft stay relatively the same.

 

I usually leave at 6k rpm, running about 7-8 psi.

 

kind of apples vs. Oranges don't you think? It would be different if they were both on pump rather pump and race gas.

 

Well it kind of boggle my mind that i was able to run a much faster time with less mph trap than my race gas set up while maintaining similar 60'

 

what pressure are you running in the slicks?

btw my all motor 1.8 ITR bottom end CRX went 7.80 in the 1/8th mile, I'm pretty sure you will be seeing some 6.xx 1/8th mile ET's once you get dialed in!

 

I run the slicks at 8 psi, i tried them at 6.5 psi before but the slick wrinkle bad when i go that low and doesn't look too safe.

 

ah. what gear do you burnout in? You need to do 3rd if you aren't. I always run 7.5 psi in my slicks.

 

try 3rd gear burnout and 6-7 psi in the slicks

 

You also have to be reving the car to the moon or shifting to 5th with the B16 tranny which could have something to do with the slower ET

 

I do a 3rd gear burnout but i dont sit on it too long, i end the 1/4 miles at the top of 4th at 9300 with the b16 which the LS bottom end didnt like too well and spun a rod bearing.

 

You need to run the car with the SAME power with 2 different trannys to really compare anything

 

i turned my B16 trans to a little over 9300 and was able to trap 149.5mph on 25s.

Problem is the gear is shorter and youre making more power then you were before. my guess would be to step up and get a new set of tires and see how she does, my car dropped 2 tenths with a new set of tires and a quaife.

what kind of power is the car actually making.

sounds like you are having the classic "over powering the current chassis" issue most people have when upping the HP quite a bit

 

Yea i rev the b16 to 9300 and 137 was right before i hit the rev limiter, power wise im not sure what exactly it is making probably in the low 500's.

Tire wise, these 24.5x8x13 have less than 20 passes on them. I think after putting the motor back together im moving back to the gsr to keep the rev down a little.

 

It doesn't matter that you ran race gas with one trans and pump in the other. You should

get more mph in the 1/8th with the B16 trans and a faster ET if you can stay in forth. Also

you should have a larger gap in mph with the gsr trans from 1/8th to 1/4. Doesn't make

sense man but your car is rollin' regardless. Got any pics of it?