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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
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too much tb?

  • Thread starter Thread starter 96darkhorse
  • Start date Start date Sep 6, 2008
9

96darkhorse

Founding Member
Oct 2, 2001
693
0
16
wilmington, california
Sep 6, 2008
#1
  • Sep 6, 2008
  • #1
when i installed my 70mm , i expected to gain some oomph...... but i actually lost power and torque, i noticed it right off the bat....i only have bolt ons and an eddy mani. i guess i might see and feel the results if i had aftermarket heads.....i notice alot of people install bigger throttle bodys when they do an intake swap and before a head swap.....have you guys felt any power loss???
 

toyman

10 Year Member
Jul 19, 2007
1,944
54
79
Vernon BC
Sep 7, 2008
#2
  • Sep 7, 2008
  • #2
96darkhorse said:
when i installed my 70mm , i expected to gain some oomph...... but i actually lost power and torque, i noticed it right off the bat....i only have bolt ons and an eddy mani. i guess i might see and feel the results if i had aftermarket heads.....i notice alot of people install bigger throttle bodys when they do an intake swap and before a head swap.....have you guys felt any power loss???
Click to expand...

During the course of a recent discussion I had with Accufab Tech support they told me the reason they dropped the 70mm TB (94-95) was because there were no performance gains with a stock engine.
 

Grn92LX

Fidanza Man!
Founding Member
Jan 14, 2001
6,819
64
129
New York
Sep 7, 2008
#3
  • Sep 7, 2008
  • #3
You didn't lose power or torque. Only way a tb can be too big is if its larger than the opening on the inlet. I have noticed some people who use the junky brand tb's report it sometimes feels different. I did not experience this when I swapped from a 65mm accufab to a 75mm accufab on my 302 as recommended by Ed Curtis @ flowtech induction.
 

'94ChickStang

Member
Sep 27, 2004
301
0
17
northern ca
Sep 7, 2008
#4
  • Sep 7, 2008
  • #4
96darkhorse said:
when i installed my 70mm , i expected to gain some oomph...... but i actually lost power and torque, i noticed it right off the bat....i only have bolt ons and an eddy mani. i guess i might see and feel the results if i had aftermarket heads.....i notice alot of people install bigger throttle bodys when they do an intake swap and before a head swap.....have you guys felt any power loss???
Click to expand...

Yes I felt a loss of power, whether it actually lost power who knows...and I didn't use cheap parts. I may or may not swap my 65 back on, we'll see!
 

Dino Dino Bambino

15 Year Member
Jun 13, 2007
1,670
87
79
Cyprus
Sep 7, 2008
#5
  • Sep 7, 2008
  • #5
Did you set the TPS voltage correctly (0.95-0.99v throttle closed)? Most aftermarket TB's have an adjustment for the TPS so you might wanna check it.
I had NO power loss when I replaced the stock TB with a Summit Racing 75mm unit. I just enlarged the upper intake opening to match the TB size.
 
T

tstang21

Member
Apr 14, 2008
219
0
16
Sep 7, 2008
#6
  • Sep 7, 2008
  • #6
i agree as well. i dont think youll lose hp/tq with a 70mm. check the tps voltage and see if its in the correct setting. this happened to 1 of my friends that he installed a bigger tb. once he set the tps voltage right, it ran really good.
 

Tom95gt

Member
Oct 10, 2007
186
1
19
South Jersey
Sep 8, 2008
#7
  • Sep 8, 2008
  • #7
How do you go about checkin the voltage?
 

Black95GTS

Active Member
Jan 8, 2004
1,644
3
38
Marlborough, MA
Sep 8, 2008
#8
  • Sep 8, 2008
  • #8
Don't fear the gear, go 4.10s!

Whoops wrong thread.

Adam
 

Dino Dino Bambino

15 Year Member
Jun 13, 2007
1,670
87
79
Cyprus
Sep 8, 2008
#9
  • Sep 8, 2008
  • #9
Tom95gt said:
How do you go about checkin the voltage?
Click to expand...

Easy if you have a digital voltmeter. Pierce the insulation of the middle wire coming from the TPS with a sewing pin but without going right through. Attach the positive lead from your voltmeter to the pin and the negative to a ground. Turn the ignition on (engine off) and read the voltage. Loosen the adjustment screws and rotate the TPS until the voltage is in the correct range (0.95-0.99v). Tighten the adjustment screws and if the voltage stays within range, you're done.
 
T

tstang21

Member
Apr 14, 2008
219
0
16
Sep 8, 2008
#10
  • Sep 8, 2008
  • #10
:
Black95GTS said:
Don't fear the gear, go 4.10s!

Whoops wrong thread.

Adam
Click to expand...

i was about to say the samething also
 
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