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Holly intake and idle question by Dmbowers98
Started on: 01-31-2014 12:58 AM
Replies: 4 (117 views)
Last post by: johnt671 on 01-31-2014 08:44 AM
Dmbowers98
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Report this Post01-31-2014 12:58 AM Click Here to See the Profile for Dmbowers98Click Here to Email Dmbowers98Send a Private Message to Dmbowers98Edit/Delete MessageReply w/QuoteDirect Link to This Post
So I have 2 questions. First, I got the holly carb and intake manifold. And I always hear about people talking about the benefits of the adjustable fuel pressure on the holly carb. Does it really give it any benefits? I mean at least enough that I should turn it up. As far as I know, people say it goes up to 15 psi and it helps with the performance. If it truly does I'm wondering how to correctly adjust it. Second question, I also swapped my 3 speed auto off of my 84 se, and put the 4 speed manual off of a wrecked 84 Se on it. I thought I read that it would have a lower rpm with the 4 speed when cruising at 60. With the auto it cruised at 3k rpm, and it still sits right there with the 4 speed. Was the stuff I read online just bs? Or does something need adjusted on the engine? Thanks in advance for any feedback.
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Fiero84Freak
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Report this Post01-31-2014 08:40 AM Click Here to See the Profile for Fiero84FreakClick Here to Email Fiero84FreakSend a Private Message to Fiero84FreakEdit/Delete MessageReply w/QuoteDirect Link to This Post
If you have both the Holley throttle body and the Holley intake it's already an improvement over the stock design. The throttle body has a much larger bore and the single injector's output should be increased with it's stock setting. With it having the much larger runners going into the engine it'll improve fuel and air delivery. Personally I would just install the components, run them as-is to ensure they are operating correctly, then from there seek out modifications to fuel pressure if it is desired.

All the Fiero transmissions are geared for when US interstate speed limits were 55 MPH. That is why your three speed auto was revving so high, because obviously you're not going to be driving 55 MPH on the highway (usually now it's 65 - 75 MPH). I always thought the five speeds rev'ed lowest at high gear as you have more gearing? I would think the four speed used in the '84 models would still rev high, but personally I have never driven a four cylinder Fiero with the four speed - only the five speed Isuzus that four cylinder cars got starting in 1985.
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Csjag
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Report this Post01-31-2014 08:42 AM Click Here to See the Profile for CsjagClick Here to Email CsjagSend a Private Message to CsjagEdit/Delete MessageReply w/QuoteDirect Link to This Post
What rear axle ratio does the car have, that will affect the rpm at 60 as well as how low profile your tires are.
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Arns85GT
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Report this Post01-31-2014 08:43 AM Click Here to See the Profile for Arns85GTClick Here to Email Arns85GTSend a Private Message to Arns85GTEdit/Delete MessageReply w/QuoteDirect Link to This Post
Have you got the Holley carburetor or the Holley throttle body?
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johnt671
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Report this Post01-31-2014 08:44 AM Click Here to See the Profile for johnt671Click Here to Email johnt671Send a Private Message to johnt671Edit/Delete MessageReply w/QuoteDirect Link to This Post
The transaxle from an 84 Se is the 4:10. There was an economy 4 speed in 84 on the base cars that would have lowered the rpms, but it is rare.
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