BBTB after CAI ?

[Woody]

Has anyone done a BBTB after doing a CAI or short ram intake? Any noticalbe differences after the BBTB ? Also, is there a BBTB out yet for the 2004 Elantra? Where to buy?

- Woody

[2004ElantraGLS]

Do a search...there is a member of this Message Board (his name has escaped me at the moment) who is in the process of making bored throttle bodies for the CVVT engine. As I understand it, he's currently waiting on another party to produce the butterfly plates. Furthermore, from what I've read, there is only a slight increase in power over the stock unit. Most of the performance gain comes in the form of better throttle response.

Axel

[Woody]

Avel,

Yes - I saw something about a member building some BBTB for CVVT. Thanks.

- Woody

[evil247]

Search the old board. I dynoed a before and after with the BBTB. was about a hp and less then 1 tq. It was throughout the powerband though. not just at peak. didn't have it in long enough to tell the difference in throttle response

[tharptroy]

spike, I didnt see Kspec as having one, the 04 throttle body design is completely different, making it a pain in the arse.

[Elantra2.001]

You will see more gains by modifying the exhaust side. The intake side for the engine is already fairly good.

[tharptroy]

yeah...you're best bang for buck right now would be a catback.

[Elantra2.001]

bang for the buck, i say intake, headers, muffler. Most of the piping for the size and air flow from the engine will be fine and might help keep some torque.

[tharptroy]

I wonder how a mandrel bent free flow 2" system would work. slightly larger than stock minus the restrictions, might be a good recipe.

[2004ElantraGLS]

I wonder how a mandrel bent free flow 2" system would work. slightly larger than stock minus the restrictions, might be a good recipe.

I thought that it was already determined that a 2 1/4 inch mandrel bent setup was best suited for our cars for N/A purposes. :confused:

Axel

[tharptroy]

it **might** be a little overkill for a car with just I/H/E. and I say that with some reservation.

[Woody]

Guys,

Yeah, I'm starting to think too that exhaust is next best money spent. What is the ball-park hp gain from cat-back. Somewhere I saw 20 hp (maybe on kspec, or shark racing sight)...but this seems high. Anybody have dynos before/after cat-back?

- Woody

[2004ElantraGLS]

it **might** be a little overkill for a car with just I/H/E. and I say that with some reservation.

Hmm...you might have a point. Our engines do seem to be touchy about that sort of thing...dropping torque when too much flow is allowed. I believe Ronniesan had a problem like that when he had a shop put dual pipes in. His torque went out the window.

However, I think the CVVT engine could still benefit from a 2 1/4 setup if teamed up with a good intake and header. I know it's not a Vtec or anything, but I believe the CVVT opens the valves up more at higher RPMs.

Personally, I plan on getting the above mentioned BBTB, slightly porting the IM, and adding a Header and a 2 1/4 pipes. Magnaflow Resinator and Muffler. I'll let everyone know how it turns out.

Axel

[evil247]

Guys,

Yeah, I'm starting to think too that exhaust is next best money spent. What is the ball-park hp gain from cat-back. Somewhere I saw 20 hp (maybe on kspec, or shark racing sight)...but this seems high. Anybody have dynos before/after cat-back?

- Woody

No one has seen gains of 20hp to the wheels even with most/all of the bolt ons available NA. Somewhere between 5-10 with the exhaust if your lucky. Expect about 5

[Elantra2.001]

I dont think you'll get even that much. With intake, headers, and a performance muffler, you should get the best balance between torque and horsepower. Leave the midpipe alone. Unless you plan to do some serious mods later.with that combo, i think you should see about 5-10 horses. I doubt more than that. This car doesnt take to NA mods very easily.

[FordFasteRR]

This chart shows Engine HP & Tail pipe diameter.
It is an approximation and applies to all engine types.
For dual exhaust setups, divide the engine HP by 2.

80 -120 --- 1 7/8
110-140 --- 2
130-150 --- 2 1/8
140-185 --- 2 1/4
180-220 --- 2 1/2
210-265 --- 2 3/4
250-320 --- 3
280-360 --- 3 1/2
400-500 --- 4
480-630 --- 4 1/2
580-750 --- 5

wow....... :) so for an NA BPU Elantra, it should be 2 1/4 (baseline) for peek torque and hp flow efficiency.

[tharptroy]

ford, does that chart apply for straight through systems with mandrel bends? I think you can see what Im getting at. all exhaust designs are not created equal

[Elantra2.001]

110-140 is two inch. At the wheels thats what we make anyway.

[FordFasteRR]

ford, does that chart apply for straight through systems with mandrel bends? I think you can see what Im getting at. all exhaust designs are not created equal


That is for a properly tuned system with good bends... mandrel is not specified but most likely suggested for performance applications.

:)