What kind of boost increase!

Gremlinsteve

Well-Known Member
Joined
Jun 6, 2016
Messages
196
Reaction score
39
Location
Houston
Vehicle(s)
727 roush
Would I be looking at going from a 80mm pulley to a 69mm Lilly on my tvs blower

I know there will be variables but I'm looking for 3-4 more psi
Over what I currently have





Advertisement

 

BlownOne

Horsepower Fiend
Joined
Apr 14, 2017
Messages
509
Reaction score
191
Location
Sacramento, Ca
Vehicle(s)
Anything with wheels
You'll need to posssibly add a larger expansion tank (if you don't have one) to increase fluid volume and help keep iats in check, but I don't think -11mm will give you +3-4psi you're looking for. You would get more pressure if you pulley down 11mm and port the blower, plus the porting will help iats.
 

Burnin4

Well-Known Member
Joined
Apr 6, 2015
Messages
858
Reaction score
318
Location
Mooresville
Vehicle(s)
17 GT350
Would I be looking at going from a 80mm pulley to a 69mm Lilly on my tvs blower

I know there will be variables but I'm looking for 3-4 more psi
Over what I currently have
Don't go to a 69mm unless you are running e85 or race gas 100% of the time. I ran a 79mm on my tvs setup and it made 11-12 psi, which is the max you want to go on 93 octane. If you don't already have the twin 67 tb or a set of headers then those should be your next 2 mods after a 79mm pulley. If you don't already have a Ken Bjonnes tune with your tvs setup then thats the first thing you should do, he's a god with the TVS setups.
 

16MustangVet

Well-Known Member
Joined
Jul 1, 2016
Messages
349
Reaction score
94
Location
North Dakota
Vehicle(s)
2016 mustang 5.0
Car has ported heads boost is arbitrary.

Id be interested to see if car responds better to pulley drop or timing.
 
OP

Gremlinsteve

Well-Known Member
Joined
Jun 6, 2016
Messages
196
Reaction score
39
Location
Houston
Vehicle(s)
727 roush
  • Thread starter
  • Thread Starter
  • #5
I'm just trying to recover the three pounds of boost I lost by porting the intake blower elbow throttle body and heads
 

Dntalman

Black Top Brawler
Joined
May 17, 2015
Messages
560
Reaction score
95
Location
Dickson Tennessee
First Name
John
Vehicle(s)
2015 Mustang GT
If you better the airflow you will lose boost pressure... That does mean you are making less power.. Your motor is a air pump. The more air you move in and out. The more power you will make.. Their is a lot of other variables when adding boost…
 

Tommy V

Well-Known Member
Joined
Jul 24, 2014
Messages
3,651
Reaction score
589
Location
Brookly park Md
First Name
Tommy
Vehicle(s)
2015 race red gt pp manual, recaros, 401al DOA "too much boost on 93", 2017 GT Auto
I think in his situation,losing that boost meant his blower was being more efficient and and the motor was takin in all that extra air.
 

Advertisement





 
89 - Solo Performance - 1


Advertisement
Top