Yes yes i know, 4" sounds crazy... but is it really?

My application:
8.8:1 srp pistons
Eagle rods
topline bearings
Darton amazing sleeves

Tinker SST manifold (omg its gorgeous)
a turbo with more flow/powa than sc61, t3/to4e 57 trim spool (top secret turbo.. .sry)
Precision intercooler
tial 38mm
Greddy type R bov

I'll be running about 22psi to acheive a near or above 500whp mark. Street will be run at appx 13 psi making ~350whp. My advisor (who is currently crazy) is demanding i mail tinker my 3" dp and have it flared or converted all together to a 4" dp. keep in mind my power goals @ X psi.

Would i benifit from this abnormally large downpipe?

-Ryan

PS - i had to throw the ? into the subject for fun, i love when people do that

 

A 4" DP flows almost twice as much air as a 3". Itll help that much more
actually, i DOES flow twices as much.
3.14(pie)X 2" squared = 39. something...
3.14 X 1.5" squared = 19. something....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tinker219 &raquo;</TD></TR><TR><TD CLASS="quote">A 4" DP flows almost twice as much air as a 3". Itll help that much more </TD></TR></TABLE>

is that extra flow necessary for my app, or will it just be that way cuz u're doing the work

 

itll be crazy because its even LESS of a restriction than a 3" will be

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tinker219 &raquo;</TD></TR><TR><TD CLASS="quote">itll be crazy because its even LESS of a restriction than a 3" will be </TD></TR></TABLE>

hrm... i just hate having to ship things that weigh ~40lbs

sam... wanna pickup the shipping tab?

 

no

 

======================

back to the main point... will the extra flow actually be utilized in my app?

 

im a beginner, but is it possible to lose torque if its too big?

 

if anything id think youd gain torque from better spool up

 

i see, but would it be opposite on a na car? sorry to steal the thread, ill shut up now

 

This isnt the NA forum, therefore i have no opinion

 

haha alright i know

 

Turbos get power from the pressure difference across the turbo. Pressure in manifold that wants to vent to pressure on exit from exhaust housing. The higher the difference in ratio, the more the exhaust will want to flow through the turbo and the faster it will spool.

3" pipe area: 28.274 si
4" pipe area: 50.265 si

I'd go for it talk about blingin', 4" downpipe. Just make sure it's a GRADUAL increase in diameter, not just a straight jump to 4".

 

k tinker... im sold... how much for the 4" w/ v-band flange?

 

same handled it, talk to him

 

Some of you just have too much damn money.. Sheesh.. I give it a thumbs up as well..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Drag_On &raquo;</TD></TR><TR><TD CLASS="quote">Some of you just have too much damn money.. Sheesh.. I give it a thumbs up as well..</TD></TR></TABLE>

that's basically the only reason why i don't want to do it... im a poor highschool senior

Tinker, do you find it odd that whenever you type sam, or on the occasion, you instead type same.... i see myself doing it all the time K tinker... im sold

https://honda-tech.com/zerothread?id=669408
https://honda-tech.com/zerothread?id=669408
https://honda-tech.com/zerothread?id=669408
https://honda-tech.com/zerothread?id=669408

 

yeah i am a junior senoir year you dont do **** get a job or two ya bum
jk

 

wait til you get to college, you cant do **** cause your to hung over, (i dont drink)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by scatuli &raquo;</TD></TR><TR><TD CLASS="quote">yeah i am a junior senoir year you dont do **** get a job or two ya bum
jk</TD></TR></TABLE>

i have 2 part time jobs, thx - restaraunt and best buy cashier

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tgh99si &raquo;</TD></TR><TR><TD CLASS="quote">wait til you get to college, you cant do **** cause your to hung over</TD></TR></TABLE>

im drunk right now

 

haha

 

sad part is, he really is.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 94goldjungsr &raquo;</TD></TR><TR><TD CLASS="quote">sad part is, he really is.</TD></TR></TABLE>

u samauri!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tgh99si &raquo;</TD></TR><TR><TD CLASS="quote">im a beginner, but is it possible to lose torque if its too big?</TD></TR></TABLE>

Back pressure is not an issue on turbo cars, as the turbo makes all the back pressure required between it self and the head. Basically, the less restricitve the better.


Rob

 

yeah but what will the rest of your exhaust look like?

4" all the way back would be nice, do a side dump just behind the passenger side door