most all of your drag cars use mbc, but the ones that dont usually are just fighting traction problems. the 1g beside me was using a ebc and i asked him why and he said traction issues. shep uses a hallman pro mbc last time i seen.

if i had 3 port or ecu boost tho hes right it would of corrected itself.. mbc is hit or miss.. i had no idea it was gonna drop 10psi going from pa to oh im still confused lol.

its only 7 hrs away, .. but then again the entire time there our ears popped like 6 times.. so we were definitely going up up up

 

Hudson is 263ft in elevation so atmospheric pressure is 14.64 psi

Norwalk is 719ft in elevation so atmospheric pressure is 14.35 psi

0.29 difference in atmospheric pressure

Wasn't the altitude difference giving you a 8-10 psi "loss."

Hint, look elsewhere. Perhaps towards RPM and Engine VE

 

wouldn't touch a carbonetics after all the trouble i've seen with them. Exedy Triple is a cracking clutch for everyday use and can take ALOT of abuse and power. If it was dragging all the time or competition use a superclutch triple will hold 1000bhp easy and the plates are fairly resonable,not good for everyday use.

 

evoscan equation right? what would that set me to about boost wise then in reality? i didnt look at my boost gauge going down the track, was to nervous to look anywhere but straight.

where im from (lancaster pa) we are 368ft above sea level.

 

damnit you added the additional info after i responded.. so the air density is what caused it then? how much difference would it make if the evoscan equation was right? are we talking .5 psi or something like that?

 

Ok so even less of a atmospheric pressure difference from there to Norfolk.

0.15 difference in Atmos pressure.

I'm not talking about anything related to Evoscan at all.

The altitude difference had nothing to do with your boost "difference".

I gave you a hint in the previous post.

 

0.15 difference in pressure would be about .1 psi of difference right? pretty much no change then logger wise.

the highest boost i have in my logs here is 31.96 so 32psi rounded up. my car here at 31-32psi has a hard time producing past 520whp if i can recall (with the current wastegate preload).... and that would set the tq somewhere around 500 or high 400's.

big eye opener for me this is.. i need to do more research before i trailer my car 7 hrs away to get screwed by air.

i had a great time tho other then the car breaking the retainer clip off clutch, so im happy. i really dread dropping the transmission tho.

now i know why you posted your initial comment.. you knew what was going on but u didnt want to tell me.. you wanted to see if i responded to your post angry i know how you are lol.
you like to test me all the time.. which is fine, but if i were to respond to your post in a bad way it would of made me look really bad.

now im super excited to go to a local track with all my HP and see what really happens.

after i hit my 10 then im going to do some road course stuff as long as it doesn't cost to much.

 

You are still not getting it. You aren't getting "screwed by air", a 0.15 difference in Atmos pressure does not do that.

So here is more of a hint.

At 6,000 rpm, 6,500 rpm and then 7500 rpm in your hometown, what boost level does the car run?

Now, at Norfolk, at the same RPM ranges, what boost levels did it run?

The other stuff you rambled on about I won't even waste the time to figured out what it was about.

I do enjoy seeing how eye opening your little travels away from home where for you.

 

My carbonetics tripple has been perfect. Pedal is pretty light for daily driver duties. I put about 30k on it in regular driving and the discs still have a good amount of life left (3.9mm is brand new according to their documentation on determining what needs to be rebuilt I have 3.8 left).

I don't have any direct experience on any other tripple except for Exedy and I'd take my carbonetics of the issues some of our locals have had with it any day.

 

This thread has been blowing up since the Shootout...lots of good info...Mr. Brown's car is a beast! I am very interested in all the clutch info going on in this thread, as I will be doing a 5 spd swap soon & need to decide on a clutch...Hurry up & fix your clutch Tom so you can go back to the track & run a 10 sec. pass!

 

Hi Tom, like it has been mentioned, most of the boost difference if probably from having the car running up at higher rpm and higher VE that result is lower peak boost than what is seen when doing a 2.5 - 3K rpm tuning/dyno pull.

You should however hit similar boost levels if you compare the rpm by rpm points, otherwise there might be something wrong. Also 8 to 10 psi difference could be ok if your peak boost is like 40 psi in a 2.5 - 3K rpm regular pull. I tune my ported stocker to 28- 29 psi in the street and when doing a drag run though the gears the most I will get is 25.xx psi.

You could also take advantage of NLTS (if you aren´t already) to keep up the boost between gear shifts.

Good luck on the local events!

Ricardo

 

thank you for that info! i need to preload the wga a bit more also then. after i fix the clutch i will work on this.

i thought the VE dropped the higher rpm tho? or did you mean to say that?

I did not use nlts, but that would definitely help big time!

The smaller hotside certainly doesn't help either.

edit: ya.. looking at a speed density car i did. idle is lower ve then when the car gets full boost the ve is very high at its peak then past a certain area uptop the ve drops off.. the ve pretty much
follows the boost curve to a certain extent aside from engine restrictions

 

Curts car is nuts for doing those times with only 23psi. then again thats what you get when you perfect your setup like he does.

i am going to get it back very soon..

but what clutch do you run?

i was gonna do either:

1. rebuild my exedy twin hd but this time use extra wave clips + buy an STM fork stop instead of this turbo trix one - the turbo trix one literally chiseled a hole in the fork arm!!!!!! the STM one uses a big bolt end to rest against the fork stop so it wont do that..

2. convert to a exedy triple and do the same above.

3. convert to a exedy triple and buy the AMS push style conversion hydraulic tob system.

4. buy an entirely new exedy triple + the ams push style conversion.

now i hear that the triple is harder on the drivetrain tho? it will destroy the trans input shaft etc?

i also hear the twin is shot after so many launches, so that seems like a bad choice for a drag car. ( i have 12 launches on my twin hd and about 15,000 miles atm)

then i hear i dont need the ams push if i use the additional wave rings + the stm stopper.

I didnt talk to STM yet, but almost every STM car at the shootout performed amazing.. so whatever they are using works.... and im pretty sure stm uses triples with the stopper + wave springs on all their customers.

 

carbonetics:-I've seen loads blow out the casing when running a decent amount of power costing customers $000's. Exedy Triple is spot on,if there having problems they don't know how to fit it correctly.

 

E.x.a.c.t.l.y

One would think a 'tuner' would understand and know these things but I guess everyone is always learning something.