Yea i'm looking into getting this part for my car. i was wondering what kind of performace increases will i get? is it just better throttle response or is it more hp too? thanks, if you have pics thats even better
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09:20 PM
PFF
System Bot
Dennis LaGrua Member
Posts: 16098 From: Hillsborough, NJ U.S.A. Registered: May 2000
Consider buying the larger bore throttle body from Darrrel Morse. His work is excellent and I believe that his prices are more reasonable than the Fiero Store. As for the exact power increase that you'll get with this mod; it is hard to say. I do know that it does make a difference in throttle response. As for power,I'm guessing that it may add 5 HP or so.
The bigger bore throttle body will not do much of anything if you don't also port the upper plenum to match. I've heard 5-8 HP for both, plus better throttle response.
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10:39 PM
85seNUT Member
Posts: 225 From: San Jose, CA Registered: Jan 2001
Originally posted by Dennis LaGrua: Consider buying the larger bore throttle body from Darrrel Morse. His work is excellent and I believe that his prices are more reasonable than the Fiero Store. As for the exact power increase that you'll get with this mod; it is hard to say. I do know that it does make a difference in throttle response. As for power,I'm guessing that it may add 5 HP or so.
Can you give me his info so i can check it out. that would be great. also was is the plenum thing? where is it and how would i bore it? and why does it make such a big difference can you buy a bored one because i'm not the best grinder in the business, actually i suck. thanks
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11:04 PM
Oreif Member
Posts: 16460 From: Schaumburg, IL Registered: Jan 2000
Don't bother with the Fiero Store TB. First, They only bore it out 3mm where Darrel bores them out 5mm. Second, Darrel also bores out the plenum where the TB bolts up to it. Finally, The FS TB is of poor quality. I had a high idle and when I held the TB up to the light, you could see the poor job they did cutting the new throttle plate. Lots of gaps. Darrel charges $150 to bore out your TB and plenum. FS wants $200 and your old TB and you still need to bore the plenum to match. The reason the plenum needs to be bored is:
Stock bore is 52mm FS is 55mm, Which means the throttle plate is 55mm. Guess what could happen when you hit the gas and your plate is bigger than the hole under it? (throttle sticks)
Just want to reinforce what Oreif said above, if you put on a bigger t-body but stay with a stock sized upper plenum opening you won't really see much of an increase in incoming air. The plenum opening would restrict the bigger t-bodys increased air intake so this is really a waste of money. If you get the bored out t-body AND the bored out upper plenum you will see much more gain. As satated above, Darrels work is exceptional and you will not be disappointed. I have his bored out t-body and upper plenum on my car and there is definetly an increase in performance. The $150.00 Darrel charges includes the boreding of the t-body, upper plenum, and return shipping to you. This is a great deal if you think about it. Darrels email address is: morse86@aol.com
------------------ Dave Gunsul Activities Director Northern IL. Fiero Enthusiasts 86 GT modified 85 SE daily driver
[This message has been edited by Dave Gunsul (edited 05-25-2002).]
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12:05 AM
85seNUT Member
Posts: 225 From: San Jose, CA Registered: Jan 2001
Originally posted by Oreif: Don't bother with the Fiero Store TB. First, They only bore it out 3mm where Darrel bores them out 5mm. Second, Darrel also bores out the plenum where the TB bolts up to it. Finally, The FS TB is of poor quality. I had a high idle and when I held the TB up to the light, you could see the poor job they did cutting the new throttle plate. Lots of gaps. Darrel charges $150 to bore out your TB and plenum. FS wants $200 and your old TB and you still need to bore the plenum to match. The reason the plenum needs to be bored is:
Stock bore is 52mm FS is 55mm, Which means the throttle plate is 55mm. Guess what could happen when you hit the gas and your plate is bigger than the hole under it? (throttle sticks)
where does he live. how long will it take cuz it sounds like my car will be down with no throttle body for a while? and if you have his information like his phone number or something that would be great. thanks
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12:33 AM
Fiero STS Member
Posts: 2045 From: Wyoming, MN. usa Registered: Nov 2001
Darrell lives in Elk River MN. just e-mail him and he will get back to you. I know he is bringing some items to the dells next week so if your there you can chat with him.
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12:38 AM
FieroBUZZ Member
Posts: 3320 From: Ontario, Canada Registered: Feb 2001
Originally posted by 85seNUT: where does he live. how long will it take cuz it sounds like my car will be down with no throttle body for a while? and if you have his information like his phone number or something that would be great. thanks
Darrel Morse Elk River, Mn 763-441-5679 Morse86@aol.com
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08:59 AM
Fierofreak00 Member
Posts: 4221 From: Martville, NY USA Registered: Jun 2001
Originally posted by Gary W: The bigger bore throttle body will not do much of anything if you don't also port the upper plenum to match. I've heard 5-8 HP for both, plus better throttle response.
This is an excellent point. If you send your throttle body out for reboring have Darrel port match the plenum.
Yeah it can be done but its not worth it on a 4 cuzz you cant really tell any difference. I also have my V-6 TB and plenum done. Here is mine from Darrel Morse.
If they are too big I apologize.
Scott
------------------ Fierokid's Web site: http://www.angelfire.com/sports/sfiero AIM: Fierokid87
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01:42 PM
LoW_KeY Member
Posts: 8081 From: Hastings, MI Registered: Oct 2001
thank you so much for all the information. i called darrel and he was very nice. he wont be able to do it for about a week or so but thats ok cuz i'm in no rush. cali to MN about 2-3 ground 2 days to do it, 2-3 days to have it shipped back. about 7 or so days downt ime. not bad for the distance. thanks again guys.
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06:18 PM
blazin' Member
Posts: 1294 From: Yorkton, SK Registered: Oct 2001
So-----chuck that baby in the lathe, turnout to 57mm , build a new 57mm throttle plate, and match the intake manifold to the tb.---I think I'll try it. P.S. I,ve done this samething to gokarts many years ago, and it sure pumped the rpms.
N2O! 
3.4!
