how big is too big
how big is too big
I have a 1995 mx3 with the KLDE how big should my eshaust be, I wanna go turbo next year, I was think 2.5" should be jus right
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I think 2.25 should be ok. 2.5 may be a bit to big for n/a . I may have lost a bit of torque but gained hp from going 1.8 inch tgo 2.5
-hec
MX-3 w/ curved neck millenia klde, boosted @ 5 psi. /bov and wastegate are good!/ nitto drag radial/ gutted interior/ millenia red top injectors, vortech fmu/aem wideband/ all bolts ons/ Car put together 100% by me. Mechanic? who needs a mechanic? ew.. real men work on their own cars!
MX-3 w/ curved neck millenia klde, boosted @ 5 psi. /bov and wastegate are good!/ nitto drag radial/ gutted interior/ millenia red top injectors, vortech fmu/aem wideband/ all bolts ons/ Car put together 100% by me. Mechanic? who needs a mechanic? ew.. real men work on their own cars!
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- tehbrookzorz
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- Nd4SpdSe
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It's just a rule of thumb, but a good guideline none the less, but there are other factors as well like mendrel and crush bent. As well, some like going 2.25 for better low end, and like fieromx3 mentioned, if your going forced induction, you want larger since you are forcing more air in, you need to efficiently get that air out (which would help the turbo spool as well).
1992 Mazda Mx-3 GSR - 2.5L KLZE : Award Winning Show Car & Race Car ['02-'09] (Retired)
2004 Mazda RX-8 GT - Renesis Wankel : LS3 Coils, BHR Mid-Pipe + Falken RT-615K 245/40r18
2011 Mazda Mazda2 GS - 1.5L Manual : Yozora Edition (1 of 500)
2003 Nissan Xterra SE - 4x4 Supercharged : 2" Body Lift, 4" Suspension Lift & 33" MTR Kevlar
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2004 Mazda RX-8 GT - Renesis Wankel : LS3 Coils, BHR Mid-Pipe + Falken RT-615K 245/40r18
2011 Mazda Mazda2 GS - 1.5L Manual : Yozora Edition (1 of 500)
2003 Nissan Xterra SE - 4x4 Supercharged : 2" Body Lift, 4" Suspension Lift & 33" MTR Kevlar
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I agree, 2.25 is better. But if your going F/A you might aswell get 2.5
I like 2.25 because there are alot of mufflers, cats, ect that support that
I like 2.25 because there are alot of mufflers, cats, ect that support that
2008 Mazda 3
1993 MX3 GS
KLZE, Fidanza flywheel, KL31 CAMs, South Bend Stage I Clutch, Pacesetter STS, SS AutoChromes, Magnaflow muffler, 2.25' Exhaust, CAI, Blaster Coil HEI, KLDE Valvetrain, 5 Speed Swap
1993 MX3 GS
KLZE, Fidanza flywheel, KL31 CAMs, South Bend Stage I Clutch, Pacesetter STS, SS AutoChromes, Magnaflow muffler, 2.25' Exhaust, CAI, Blaster Coil HEI, KLDE Valvetrain, 5 Speed Swap
- Custom_V6_Limited_SE
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You have to keep in mind that the change in area is not linear with respect to the change in diameter. The change in area has a r^2 dependence. In other words, the area increases exponentially with respect to the radius increase. For example, dual 2.5" exhaust has approximately the same area as a single 3.5" exhaust pipe; not a 5" exhaust pipe. In fact, a 5" exhaust pipe has exactly double the area of dual 2.5" exhaust. So, one 5" pipe is equivalent to quad 2.5" exhaust.tehbrookzorz wrote:That's an awesome rule. I'm gonna tell my friend with his 5.7L Mustang. lol, but I guess that's what dual exhaust is for.
I'd kinda like to try dual exhaust from the headers back; no y-pipe.
'93 MX-3 GS SE:My Mods
- mx3autozam
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either way 2.25 or 2.5 will be better but i think its personal prefrence. I have 2.25 and its just fine. 2.5" you will loose a bit of torque but will have more in the high end, compared to 2.25 will retain torque but of course not in the high end. Either way its going to barely noticeable. I think if its a daily driver think about what you do the most city of highway driving. if city than go 2.25 for the torque, if highway go for high end!
93 Mazda MX3 KLZE Turbo
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