Did You lose bottom end when u put a intake on???

sliver02GT · May 6, 2004

i put a tb and a accufab intake on and i feel like i lost bottom end, is this common

thanks

smokin 04 · May 6, 2004

Was at the track last night, another racer was saying the same thing about his setup. He talked to Accufab and they said It could be caused by the 75mm throttle body. They told him a 70mm might be a better unit for low end response. His car had similar mods to yours

BMan5150 · May 6, 2004

sliver02GT said:
i put a tb and a accufab intake on and i feel like i lost bottom end, is this common

thanks

No, but I have the 70 MM TB.

RysRed96GT · May 6, 2004

if the runners are short, you'll gain hp (high end power) and loose low end due to a reductin in the ram charging phenomenon. longer runners create more momentum of air, and hence, more torque (low end).

JonJon · May 6, 2004

how do you feel such a small change

dkshadow · May 7, 2004

RysRed96GT said:
if the runners are short, you'll gain hp (high end power) and loose low end due to a reductin in the ram charging phenomenon. longer runners create more momentum of air, and hence, more torque (low end).

I think they just meant the Plenum.

RysRed96GT · May 7, 2004

dkshadow said:
I think they just meant the Plenum.

oops

todd4566 · May 7, 2004

I feel low end loss in the 1500-2000 range. Feels much better 2800+. Try putting the stock t-body back to restore the low end. It worked for me, but I ended using the 70mm in the end. 4.10's cured the low end issues.

Rio96 · May 7, 2004

>I feel low end loss in the 1500-2000 range.<

That statement is kinda suspicious...
at those RPMs, the predominant factor in engine performance is the timing of the closing
of the intake valve.

twogts4us · May 7, 2004

JonJon said:
how do you feel such a small change

I'm with JonJon - especially with 4.10s, how would you notice? The 75mm TB reportedly mirrors the stock RWHP up until 3K+, while the 70mm has minimal gains throughout the range, but honestly, I don't see how this would be noticable.

03trubluGT · May 7, 2004

JonJon said:
how do you feel such a small change

Nowhere in the dyno sheet was there a loss in HP or TQ when going from stock to 70mm OR 75mm TB.

Matt

Arnolds97 · May 7, 2004

Loss of bottom end.

I had a non SVT Contour years ago and put on a SVT Throttle Body on it. it was much bigger than the standard V6 one. I lost bottom too. I did feel a slight increase at 4000+. I thought i wasted my money then (250.00.). I think you lose velocity of the air so it does not react as fast. Kinda the same thing that cutting post out of the Mass Air sensor does.

stimmler · May 7, 2004

only gains here. Also 70mm, but as Matt said, neither of his tests showed any losses 70 vs 75mm.

todd4566 · May 7, 2004

Rio96 said:
>I feel low end loss in the 1500-2000 range.<

That statement is kinda suspicious...
at those RPMs, the predominant factor in engine performance is the timing of the closing
of the intake valve.

Ok bud.. your welcome to your own opinions. I'm very particular about torque. I couldn't prove the loss on the dyno since we started at 2500, but in my case it is noticeable. The car just doesn't get up and go way down low as easy as it did stock. I posted about it right when I first slapped the plenum on. Obviously I am not the only one who felt the loss.

03trubluGT · May 7, 2004

I personally can't tell anything in that range. Hopefully you don't spend very much time there so you won't feel that your investment is a total loss.

1500-2000 rpm is just a by product of getting to the upper rpm range where you make the meat and potatoes of your power.

Matt

03-s281 · May 7, 2004

I felt like I lost low end when I put my o/r x pipe on then gained it back
when I did the TB.
Before the x-pipe I could be in 2nd and mash the gas and break the tires
loose then after I couldn't.
But my car did have a catted x on it to begin with.
Either way it wasnt enough to worry about it.

KaPPaBaLL · May 7, 2004

For the guys that think when they added a mod and lost power. You changed the overall hp and tq curve of your car so it may Feel like you're not going faster but in essence you are. If you had your car dynoed you'll see higher hp and tq numbers. Nothing to worry about.

todd4566 · May 8, 2004

03trubluGT said:
I personally can't tell anything in that range. Hopefully you don't spend very much time there so you won't feel that your investment is a total loss.

1500-2000 rpm is just a by product of getting to the upper rpm range where you make the meat and potatoes of your power.

Matt

True. I don't spend much time down that low, but I did notice. I swapped t-body's back and forth (65&70) after the plenum install to see what REALLY pulled better. The 70mm seemed like a better all around champion.

Did You lose bottom end when u put a intake on???

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