2g head and intake to 1g swap gains !

[v8killer]

i have a 95 talon tsi with a 14b and supporting mods. just wondering what gains i would get from going to a 1g head and intake ! would i loose alot of torqe out of boost !

 

[wishihadatalon]

i have a 95 talon tsi with a 14b and supporting mods. just wondering what gains i would get from going to a 1g head and intake ! would i loose alot of torqe out of boost !

If it were me, I would leave a 2g head and intake on there. The off boost throttle response and mid range you have with the 2g parts is well worth keeping vs the even small gain that you might see with a 1g head and manifold, especially with the 14b that you run right now.

 

[v8killer]

well i plan on going with a 50 trim later in the near future and don't wont the small intake and head ports to hurt my performance, i wish someone had some results from the swap so i could see the gains or tradeoffs !

 

[wishihadatalon]

well i plan on going with a 50 trim later in the near future and don't wont the small intake and head ports to hurt my performance, i wish someone had some results from the swap so i could see the gains or tradeoffs !

I still don't think that you would see any gains from switching to a 1g head. The lacking performance in a 2g setup is in the cams and intake manifold. The ports are plenty large enough to low the power that a 50 trim will produce.

 

[bastard dsm]

2g heads are fine, take a look at this and it will answer all your head Q's.

Magnus Motorsports - EVO Stroker Build-Up

 

[v8killer]

i do have a 2g fwd so if i did go to the 1g setup i could afford to loose some torque down low if the gains up top are good ! but i still don't want it to be like the 1g cars that had no torque out of boost but wouldn't the 8:5.1 compression help with the torque ! if i keep my 1g head would i gain from porting the stock 2g intake or running the 1g intake and porting my 2g head or leave them both alone. thanks !

 

[bastard dsm]

if your not planing on reving past 7k then i would stick with the 2g head.
i have a 6bolt block and 2g head and evo3 intake manny and my car
has a better low and mid range compared to my 6bolt head,it makes a
better daily.

 

[dsm-onster]

I have a 1g car and I have plenty of torque out of boost. Even with the 272 style cams. There's no report of 2g engines showing more torque than 1g guys in the midrange with otherwise the same setup.

--The 1g intake manifold plenum is quite a bit larger. This greatly helps power through out the range of a turbo car.

--The runners are also a bit shorter. This helps power up top.

--The 1g runners are longer. A wider diameter helmhotz pipe (intake runner) actually LOWERS the resonant rpm range. The helmhotz formula for runner length is:

L = [(EVCD × 0.25 × V × 2) ÷ (rpm × RV)] - ½D

Where:
EVCD = Effective Valve Closed Duration
RV = Reflective Value
V = Pressure Wave Speed
D = Runner Diameter​

--Shorter runners increase velocity. To achieve a higher velocity takes more energy. You cant get something from nothing. That energy has to come from somewhere. Pumping loss defines the energy it takes to suck air into the engine. So I'll say again: the smaller runners increase velocity.

--The 1g intake manifold flows better than aftermarket manifolds up to 6500rpms and pulls to redline VERY well.

--There's no way to bolt on the MUCH better 1G intake manifold alone, without having a terrible step at the head runner or botching up the runner blending it in.


Smaller runners may increase torque. But the runners were designed around stock horsepower levels. A 50-trim can deliver 2.5 times more than stock flow.

 

[microgalant]

Ok, I put a 1g intake on a 2g head, hmm teh car kept the same hp when I had the 1g head on.
One thing I've to say the car acelerate better than before.

 

[dsm-onster]

Dyno? or at least before and after logs? . . .