a buddy of mine was going to bore out my throttle body for me, but I was wondering if the stock throttle body out of a 98GS can be bored w/out hurting anything. We were wondering if the butterfly "flaps" on them would have to be changed if we bored it out to say 60mm. also, does the mass air flow sensor interrupt the flow of the extra air going into the engine and bsaically ruin the extra air flow?
1995 GST 6-bolt JDM swap Evo 16G port/polish 28x7.5x3.5 FMIC (had to cut bumper to make it fit) 686 Injectors Walbro 255-HP ACT 2600 Clutch Full 3" Turbo-Back Exhaust RamCharge MAF Translator w/ upgrade chip RRE Front/Rear Strut Bar Eibach Pro-Kit NGK Plugs/Wires Crushed 1g BOV vented to atmosphere Apexi SAFC Powerslot Rotors Autometer Phantom A/F, Boost, EGT Redline Synthetic M.T.F. 2g Manifold ported w/ ported 02 housing K&N Custom Cold Air Intake Apexi Turbo Timer Joe P MBC @ 19p.s.i.
#37542, "RE: question about stock throttle bodies" In response to Reply # 0
You can't bore the stock one to 60mm. Thats why you get the Jeep TB. You can bore yours up to 57mm, but most do it to 55mm. If you bore your TB, you have to make a new throttle plate ("Butterfly") no matter how much you bore it out. If your friend didn't already know this, I wouldn't let him do it. Make him do his first.
#37544, "RE: question about stock throttle bodies" In response to Reply # 2
Scott, you can purchase a bigger throttle body from HowellAutomotive.com. Don't let your friend do it. This takes very precise machining and if he screws up, it will be a big expensive headache for you. Sean
Built 420a NER turbo kit T3/T04s ball bearing AFX UDP Crane 0014 cams
#37545, "RE: question about stock throttle bodies" In response to Reply # 3
thanks for all your feedback guys, but my friend who is gonna do it use to make guns for bosnia when they were at war. He can pretty much machine anything in the world very preciscly and the brand new 50K laser cutting machine at his work will help him as well. How do you change the flaps that you need after your done boring out the TB?
1995 GST 6-bolt JDM swap Evo 16G port/polish 28x7.5x3.5 FMIC (had to cut bumper to make it fit) 686 Injectors Walbro 255-HP ACT 2600 Clutch Full 3" Turbo-Back Exhaust RamCharge MAF Translator w/ upgrade chip RRE Front/Rear Strut Bar Eibach Pro-Kit NGK Plugs/Wires Crushed 1g BOV vented to atmosphere Apexi SAFC Powerslot Rotors Autometer Phantom A/F, Boost, EGT Redline Synthetic M.T.F. 2g Manifold ported w/ ported 02 housing K&N Custom Cold Air Intake Apexi Turbo Timer Joe P MBC @ 19p.s.i.
#37546, "RE: question about stock throttle bodies" In response to Reply # 4
I wouldn't go past 57mm. I think the reason that you can't buy an aftermarket bored TB any bigger than that is because you start to run into internal channels. I'm not exactly sure about that, so I may be wrong there.
As far as the plate is concerned, I just took a measurement and the plate diameter is ~.015 inches smaller than the bore. It may need to be more or less than that depending on the thickness of the material you're using to make the plate, but that should at least give you a good starting point.
Good luck. Keep us posted on your results.
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#37547, "RE: question about stock throttle bodies" In response to Reply # 5
HI everyone. I was just wondering, what does a bored throttle body do? I mean, I know its bigger so it allows more air, but what about the size of the intake manifold? That doesnt change, so I mean, what does a bored TB do? Or is the intake manifold already bigger?
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