Downpipe
08-02-2007, 08:47 PM
#16
Legend Killer
Rennlist Member
Rennlist Member
Join Date: Jul 2005
Location: Nor-Cal
Posts: 4,296
Likes: 0
Received 0 Likes
on
0 Posts
I got a Super 61 going in soon also. Already have the SFR 3" downpipe attached and ready to go. Cant wait to hit the streets with this new set up.
08-02-2007, 09:02 PM
#17
Race Car
Join Date: Sep 2005
Location: TEXAS
Posts: 4,247
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Porschefile
I think a lot of people might get confused on this subject. Technically everything post-turbo is being FORCED out of the motor. Velocity isn't really a concern as much as being able to get as large a volume of air out as possible. 3" turbo back is a good idea. Pre-turbo, yes velocity is very important as you want to get airflow to the turbo as quickly as possible to get things spooling more quickly. After the turbo you simply need to get as much air out of the way as quickly as possible to keep from holding the turbo back with backpressure. True, you can "engineer" the exhaust a bit more efficient than that but a 3" turbo back exhaust is still a better idea on a 951 with an upgraded turbo than sticking with the stock stuff.
08-02-2007, 09:14 PM
#18
Burning Brakes
Join Date: Oct 2006
Location: NE Ohio
Posts: 1,066
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by nize
apparantly, either you are not searching correctly, are retarded, or are just lazy and want others to do your research for you. searching for 'downpipe' in the 951 forum returns over 150 results. here are two to get you started before you continue to beat this long dead horse;
https://rennlist.com/forums/showthre...light=downpipe
https://rennlist.com/forums/showthre...light=downpipe
https://rennlist.com/forums/showthre...light=downpipe
https://rennlist.com/forums/showthre...light=downpipe
08-02-2007, 09:24 PM
#19
Drifting
Thread Starter
Join Date: Feb 2003
Location: Akron, Ohio
Posts: 2,254
Likes: 0
Received 0 Likes
on
0 Posts
Hey there, thanks for the "retarded" mark there, I was looking for some info if anyone has seen an improvement going to the 3" downpipe and where people got them. I did do a search on downpipe but many don't talk about increase in performance just by itself. Most do larger turbo other exhaust work at the same time, so of course they will get an improvement. I am tring to see if spending over $400 on the pipe is really worth it.
Originally Posted by nize
apparantly, either you are not searching correctly, are retarded, or are just lazy and want others to do your research for you. searching for 'downpipe' in the 951 forum returns over 150 results. here are two to get you started before you continue to beat this long dead horse;
https://rennlist.com/forums/showthre...light=downpipe
https://rennlist.com/forums/showthre...light=downpipe
https://rennlist.com/forums/showthre...light=downpipe
https://rennlist.com/forums/showthre...light=downpipe
08-02-2007, 09:56 PM
#20
Race Car
Join Date: Sep 2005
Location: TEXAS
Posts: 4,247
Likes: 0
Received 0 Likes
on
0 Posts
Best rule of thumb anyone ever told me.
To do it right. Expect about 1 horsepower per $100 Spent. While that isn't always true with turbo cars... (INtake, chip exhaust,) It starts hitting that price after those upgrades. So.... In that perspective. AFTER the first ones are accomplished. I think It will be worth it with the quicker spool and small increase in horsepower combined.
Headers for NSX... 1600. Power increase..20hp. The world I came from.. So what seem like expensive upgrades to most here. I think are a pretty good Bang for my dollars. .....02
To do it right. Expect about 1 horsepower per $100 Spent. While that isn't always true with turbo cars... (INtake, chip exhaust,) It starts hitting that price after those upgrades. So.... In that perspective. AFTER the first ones are accomplished. I think It will be worth it with the quicker spool and small increase in horsepower combined.
Headers for NSX... 1600. Power increase..20hp. The world I came from.. So what seem like expensive upgrades to most here. I think are a pretty good Bang for my dollars. .....02
08-02-2007, 09:59 PM
#21
Banned
Join Date: Aug 2004
Location: seattle, washington - usa
Posts: 1,822
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Mike1982
Hey there, thanks for the "retarded" mark there, I was looking for some info if anyone has seen an improvement going to the 3" downpipe and where people got them. I did do a search on downpipe but many don't talk about increase in performance just by itself. Most do larger turbo other exhaust work at the same time, so of course they will get an improvement. I am tring to see if spending over $400 on the pipe is really worth it.
perhaps you could do one.
08-02-2007, 10:06 PM
#22
Three Wheelin'
Originally Posted by Mike1982
Hey there, thanks for the "retarded" mark there, I was looking for some info if anyone has seen an improvement going to the 3" downpipe and where people got them. I did do a search on downpipe but many don't talk about increase in performance just by itself. Most do larger turbo other exhaust work at the same time, so of course they will get an improvement. I am tring to see if spending over $400 on the pipe is really worth it.
Are you still on a stock turbo? If so, it's not really worth it due to the cost and hassle involved as there are cheaper/easier ways to get power out of the stock setup. With any upgraded 300+whp turbo, there's definitely a worthwhile gain. Although I have no substantiating facts to back that up with a 951, the sheer number of people seeing gains and improvements in spool on smaller motors and with smaller turbos leads me to believe there is definitely some room for improvement in this aspect on 951's. Although I can almost predict someone will start whining yet again about my lack of proof, alas no one has bothered to offer any facts or proof to disprove this claim either.
08-02-2007, 10:53 PM
#25
Drifting
Originally Posted by nize
for the record, nobody did a before/after dyno comparison with just the downpipe swapped and nothing else changed.
perhaps you could do one.
perhaps you could do one.
Mike - give Eric Steinel a call and get his take. He has done his share of playing around with high hp 951's. Also you might try posting on 951forums. a final thought is to talk to Stainlessworks to see if they would fab one up for you - they are in Auburn and could fit it to your car. I would be willing to go in with you if they can build multiple units for minimal extra to defray the costs.
http://www.stainlessworks.net/cart/index.php
08-02-2007, 11:02 PM
#26
Drifting
Join Date: May 2006
Location: Melbourne
Posts: 3,481
Likes: 0
Received 0 Likes
on
0 Posts
for a long time i've been considering jigging up to make 3 and 3.5 " down pipes what is a fair price for them change over 200??
and the further forward you go with exhuast the more it matters the bigger it is at the start the more it cools from expanding and the less pipe it needs later on that is why plenty of fasts evos get around with a full system and a choke in the back and see liitle effect removing the choke
and the further forward you go with exhuast the more it matters the bigger it is at the start the more it cools from expanding and the less pipe it needs later on that is why plenty of fasts evos get around with a full system and a choke in the back and see liitle effect removing the choke
08-02-2007, 11:05 PM
#27
Originally Posted by gt37vgt
for a long time i've been considering jigging up to make 3 and 3.5 " down pipes what is a fair price for them change over 200??
and the further forward you go with exhuast the more it matters the bigger it is at the start the more it cools from expanding and the less pipe it needs later on that is why plenty of fasts evos get around with a full system and a choke in the back and see liitle effect removing the choke
and the further forward you go with exhuast the more it matters the bigger it is at the start the more it cools from expanding and the less pipe it needs later on that is why plenty of fasts evos get around with a full system and a choke in the back and see liitle effect removing the choke
3.5 ain't gonna work on a 951, dude.
08-02-2007, 11:09 PM
#28
Rennlist Member
Nize, I think we all know you're the retard. I remember when you came on here looking for a used J-boot and got upset because you couldn't find one under $30. Cheap cheap cheap. And lets not forget the recent that thread when you posted your story about how you were traffic cop for a day. I bet like 50 years ago when you were in grade school you volunteered to be hall monitor.
08-02-2007, 11:33 PM
#29
Drifting
Join Date: May 2006
Location: Melbourne
Posts: 3,481
Likes: 0
Received 0 Likes
on
0 Posts
3.5 dump pipe into a full 3" is a proven science . and what if you had a full 4" exhust is 3.5" still no good ??
i understand that you cant go bigger than 3" at the lower flange . from the back of the turbo to the tailpipe tip nothing bigger has ever not worked .
i understand that you cant go bigger than 3" at the lower flange . from the back of the turbo to the tailpipe tip nothing bigger has ever not worked .
08-02-2007, 11:41 PM
#30
Banned
Join Date: Aug 2004
Location: seattle, washington - usa
Posts: 1,822
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by nitehawk951
Nize, I think we all know you're the retard. I remember when you came on here looking for a used J-boot and got upset because you couldn't find one under $30. Cheap cheap cheap. And lets not forget the recent that thread when you posted your story about how you were traffic cop for a day. I bet like 50 years ago when you were in grade school you volunteered to be hall monitor.
https://rennlist.com/forums/showthre...ghlight=j-boot
and the reckless driving hit-and-run chick is still in jail while i'm not. i didn't know so many people would defend crazy hit-and-runners. rennlist sure is awesome.