Single and stock ports?
#1
Single and stock ports?
I'm getting a new engine next week and am now actually considering keeping the stock ports as opposed to porting it. I know I would loose top end power, but I don't care if my car makes 375 max rwhp or 420 max hp. I'm very concerned about lower end power and anything about 350 - 385 max is great for what I use the car for. It seems to me that a good "small" single (GT35R/RX6) on stock ports might provide some good low end torque/hp and a fair max hp number. I was considering the new BNR's but heat, weight and complexity savings is making me consider going single.
Who out there has a single running on stock ports? What are your impressions? Do you have any dyno sheets?
Are these advantages/disadvantages accurate?
Advantages to stock ports and single:
1) Better low end torque (how much better?)
2) Better turbo spool up (how much better?)
Disadvantages:
1) Lower top end power
Any input is appreciated. Thanks.
Matt
Who out there has a single running on stock ports? What are your impressions? Do you have any dyno sheets?
Are these advantages/disadvantages accurate?
Advantages to stock ports and single:
1) Better low end torque (how much better?)
2) Better turbo spool up (how much better?)
Disadvantages:
1) Lower top end power
Any input is appreciated. Thanks.
Matt
#4
Originally Posted by turboR1
i have a gt35r on a completely stock motor stock ports... car makes 403rwhp at 15psi... spool is super quick 10psi by 4k...
Originally Posted by books
I also have a 35r on stock ports. I am just starting to tune though. If you'd like I can send you an excel spreadsheet with boost recorded along with its corresponding rpm. Just pm me with your email address if you want a file.
matt.oehler@gmail.com
#5
Eye In The Sky
iTrader: (2)
Join Date: Feb 2001
Location: In A Disfunctional World
Posts: 7,895
Likes: 0
Received 114 Likes
on
66 Posts
I have stock intake ports and a very mild exhaust port(about + 1/16" to the top and bottom). When running 15psi boost, I have 14PSI by 3600 rpm. WG spring pressure value affects this.
Runs better all around than my non-seq twins did.
Runs better all around than my non-seq twins did.
#6
No it's not Turbo'd
Bottom Line, Porting = more exhaust flow = faster spool.
It's not just about top end power, an engine that breathes better spins the turbine faster.... I have a GT35/40 with a horrific tune, (Soon to be rectified) but it spools by about 9-10 Psi by 3500... or even sooner depending on where in the map I am and how shitty the Ignition advance is @ that point.
Either way Porting = Sucks for Economy, Motor Warranty, and Smog
Porting = Rules for Turbo Spool Time, Top HP #
It's not just about top end power, an engine that breathes better spins the turbine faster.... I have a GT35/40 with a horrific tune, (Soon to be rectified) but it spools by about 9-10 Psi by 3500... or even sooner depending on where in the map I am and how shitty the Ignition advance is @ that point.
Either way Porting = Sucks for Economy, Motor Warranty, and Smog
Porting = Rules for Turbo Spool Time, Top HP #
#7
Originally Posted by DCrosby
Bottom Line, Porting = more exhaust flow = faster spool.
It's not just about top end power, an engine that breathes better spins the turbine faster.... I have a GT35/40 with a horrific tune, (Soon to be rectified) but it spools by about 9-10 Psi by 3500... or even sooner depending on where in the map I am and how shitty the Ignition advance is @ that point.
Either way Porting = Sucks for Economy, Motor Warranty, and Smog
Porting = Rules for Turbo Spool Time, Top HP #
It's not just about top end power, an engine that breathes better spins the turbine faster.... I have a GT35/40 with a horrific tune, (Soon to be rectified) but it spools by about 9-10 Psi by 3500... or even sooner depending on where in the map I am and how shitty the Ignition advance is @ that point.
Either way Porting = Sucks for Economy, Motor Warranty, and Smog
Porting = Rules for Turbo Spool Time, Top HP #
Trending Topics
#9
BOOSTED Vert
Join Date: Sep 2002
Location: Miami
Posts: 2,307
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by widebody2
I have also always been under the impression that with a ported motor you are sacrificing some low end power.
basically when the port is opened up( exhaust port) the air flows better but at a lower velocity because there is not as much restriction. but you wont be able to feel 1/16".
#13
Racing Mechanic
I have one rx-7 complatly standar with a single To4e turbo , its run much much faster than with the singles secuentials , you can drive it every day with no problems at all. Its start pulling at 3500rpm , but it runs very hard when it reach the 5000 rpm to the 8200.
It have a Pattit racing ecu and the Single turbo , only that.
I have another Rx-7 that's is ported , and it is much unstreetable , than the non ported one , too much lag , and , poor fuel economy. But it run faster.
It have a Pattit racing ecu and the Single turbo , only that.
I have another Rx-7 that's is ported , and it is much unstreetable , than the non ported one , too much lag , and , poor fuel economy. But it run faster.
#15
Temple of Cornd0g
Originally Posted by moehler
Can you elaborate on this? What turbo are you using?
#16
Lives on the Forum
Join Date: Dec 2001
Location: San Lorenzo, California
Posts: 14,716
Likes: 0
Received 8 Likes
on
8 Posts
Depending on the shape/size of the porting, you should be able to get more top end without losing any significant amount at the low end. Mild streetport should be good for at least 20 rwhp without losing any low end. Someone correct me if I'm wrong.
Thread
Thread Starter
Forum
Replies
Last Post
sherff
Adaptronic Engine Mgmt - AUS
9
02-24-19 12:09 PM