Throttle body spacer?

[jretzlaff]

I'm beginning the process of making my 00GT breathe a little better with new exhaust and intake. On a non-s/c 3.8L, is a throttle body spacer something I will also benefit from?

[richtazz]

I doubt it. As the upper plenum is air only, adding a spacer won't do much if anything. On a TBI or carbureted engine, spacers increased the overall manifold volume allowing better atomization of the fuel. Since your car is multiport injected, and each cylinder has it's own injector, adding to the plenum volume prior to the additon of fuel has little if no effect.

[BNaylor]

Originally Posted by richtazz

I doubt it. As the upper plenum is air only, adding a spacer won't do much if anything. On a TBI or carbureted engine, spacers increased the overall manifold volume allowing better atomization of the fuel. Since your car is multiport injected, and each cylinder has it's own injector, adding to the plenum volume prior to the additon of fuel has little if no effect.

I agree with Rich. TB spacer serves no real purpose on a NA 3800. On a supercharged 3800, the sole purpose of the spacer is to shield the throttle body from heat generated by the supercharger. The spacer runs about 1" in size and is made out of phenolic type plastic. The spacer helps reduce knock retard by insulating the TB from the SC.







Thrasher CAI, DHP v1.0 PCM, SLP Headers,
3.25 SC pulley, CAIT GMAF, 2.5 DP/Hi-Flow CAT,
u-bend delete, 160 TS, ZZP Stage 1 72mm TB,
TB spacer, MSD 8.5mm wires, Autolite 103,
Goodyear Gatorback Serp. & SC Belt,
Nitto NT555R Drag Radials
1/4 ET: 13.210 sec. @ 104.490 mph
0 - 60 ft: 1.945 sec.

[KX2000GTP]

is there a write up for the throttle body spacer install anywhere? it's comming along well, i just want something to look at.

[BNaylor]

Originally Posted by KX2000GTP

is there a write up for the throttle body spacer install anywhere? it's comming along well, i just want something to look at.

Here's one for a ZZP TB spacer but it should be the same if you have one from other companies like MAP Engineering:

http://www.mccgp.com/upgrades/thrott...ody_spacer.php

Have fun!






Thrasher CAI, DHP v1.0 PCM, SLP Headers,
3.25 SC pulley, CAIT GMAF, 2.5 DP/Hi-Flow CAT,
u-bend delete, 160 TS, ZZP Stage 1 72mm TB,
TB spacer, MSD 8.5mm wires, Autolite 103,
Goodyear Gatorback Serp. & SC Belt,
Nitto NT555R Drag Radials
1/4 ET: 13.210 sec. @ 104.490 mph
0 - 60 ft: 1.945 sec.

[vamc]

Originally Posted by bnaylor3400

I agree with Rich. TB spacer serves no real purpose on a NA 3800. On a supercharged 3800, the sole purpose of the spacer is to shield the throttle body from heat generated by the supercharger. The spacer runs about 1" in size and is made out of phenolic type plastic. The spacer helps reduce knock retard by insulating the TB from the SC.







Thrasher CAI, DHP v1.0 PCM, SLP Headers,
3.25 SC pulley, CAIT GMAF, 2.5 DP/Hi-Flow CAT,
u-bend delete, 160 TS, ZZP Stage 1 72mm TB,
TB spacer, MSD 8.5mm wires, Autolite 103,
Goodyear Gatorback Serp. & SC Belt,
Nitto NT555R Drag Radials
1/4 ET: 13.210 sec. @ 104.490 mph
0 - 60 ft: 1.945 sec.

I agree with this. You make a good point.