IC pipping size?
06-23-04, 03:37 AM
#4
Stock piping is 2.75". Most turbos used on RX-7s have 2.5" compressor outlets. Measure the IC inlet and use that size, so long as you can clear the hood with it. You'll probably need a transition at some point to match the size of the turbo outlet.
Pressure drop comes from restriction, so a 3" pipe will have less pressure drop than a smaller one. Transitions add restriction, too, so it wouldn't make sense to go from 2.5" turbo outlet to 3" pipe to 2.75" IC inlet. Better to just transition once: 2.5 turbo outlet to 2.75" pipe to 2.75" IC inlet (or use 2.5" pipe). Bigger pipe adds volume but has lower restriction. Smaller pipe has less volume but is more restrictive.
-Max
Pressure drop comes from restriction, so a 3" pipe will have less pressure drop than a smaller one. Transitions add restriction, too, so it wouldn't make sense to go from 2.5" turbo outlet to 3" pipe to 2.75" IC inlet. Better to just transition once: 2.5 turbo outlet to 2.75" pipe to 2.75" IC inlet (or use 2.5" pipe). Bigger pipe adds volume but has lower restriction. Smaller pipe has less volume but is more restrictive.
-Max
06-23-04, 12:35 PM
#5
I brake boost
Join Date: Aug 2003
Location: Orlando
Posts: 2,128
Likes: 0
Received 0 Likes
on
0 Posts
How much power are you looking for? How big is the IC endtank inlet pipe? And how big is your turbo outlet?
This will help alot! Just let us know and when can advise you.
This will help alot! Just let us know and when can advise you.
06-23-04, 06:03 PM
#6
Learned alot | Alot to go
iTrader: (2)
Join Date: Apr 2002
Location: Rotaryland, New Hampshire
Posts: 4,232
Likes: 0
Received 0 Likes
on
0 Posts
Corky bell says..
Now devide this # by 1100 to give you the speed of air in the pipe. If its higher than .4 then increase the pipes ID, if its substainatly lower, possibly decrease the ID.
-Jacob
Corky Bell's Maximum Boost - Pg 61 There is probably a magic number that airflow velocity in a tube should not exceed, for reasons of rapidly increasing drag and consequent flow losses. I suspect this number is around Mach .4 or about 450 feet per second, sience drag, and thereflore flow loss, is increases significantly after this.
Tube size can easily be checked by caluclating the maximum aireflow attainable, dividing that by the area of the tube in square feet, and dividing again by 60 to convert to feet per second. An approximate value for maximum aireflow can be obtained by muliplying the desired bhp by 1.5
Tube size can easily be checked by caluclating the maximum aireflow attainable, dividing that by the area of the tube in square feet, and dividing again by 60 to convert to feet per second. An approximate value for maximum aireflow can be obtained by muliplying the desired bhp by 1.5
Corky Bell's Maximum Boost - Pg 62 Resist the temptaion to use larger diameter tubes than neccessary, as little drag is created in smooth tubes with gental bends. larger tubes will only add to the volume of the IC system, and that is not a good thing to do
-Jacob
Last edited by CrackHeadMel; 06-23-04 at 06:25 PM.
Trending Topics
06-24-04, 01:14 AM
#8
There was a thread about this very subject not too long ago. I ran some numbers with Corky's estimated speed limit and even 2.5" pipes seemed big enough unless you are building a super-beast of an RX-7. I don't remember the numbers, but a quick search would surely locate the thread.
-Max
-Max
06-24-04, 01:40 AM
#10
not sure anymore
Join Date: Aug 2003
Location: leawood,kansas
Posts: 1,182
Likes: 0
Received 0 Likes
on
0 Posts
i just got that book. its great. I will have to do the math on that and post back with some #'s for you guys to go off of. This will be with a stock turbo though as i ran out of money.
06-24-04, 12:32 PM
#11
This will be used with Apexi FMIC, GT40R Turbo (if ever gets here) 16-18 psi for now. Once ported motor goes in then I will be running higher boost... The info I got from A-spec was 2.75 outlet on turbo. The IC has 2.5 in and out. Using Greddy elbow... ??????? What do you think?
Thread
Thread Starter
Forum
Replies
Last Post
Turblown
Vendor Classifieds
12
10-17-20 03:25 PM
