Is there any REAL advantage to a dual split downpipe?

[gotsomegetsome]

Vs. a single large pipe?

http://cgi.ebay.com/ebaymotors/86-92-Supra-7MGTE-Turbo-Elbow-O2-housing-Downpipe_W0QQitemZ170429207430QQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item27ae5f5386

http://cgi.ebay.com/ebaymotors/3-Turbo-Downpipe-Exhaust-Toyota-Supra-7MGTE-MKIII_W0QQitemZ230423982098QQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item35a656f012


Here are the two separate links that you can view to see what I am talking about. I was thinking that one large single would be better due to its simplicity, but the dual just looks so damn cool!!

 

[RazoE]

don't buy that ebay shit..

buy your downpipe here..

http://bicperformance.com/products.htm

there are seperate options to recirculate, or vent, etc..

 

[AP1FreaKsLiDe]

Actually, that eBay "shit" is pretty nice. I have the recirculation DDP on the second link and it's very nice. I know you guys "want to support local Supra owners" and stuff but mine works very very well.

 

[TurboStreetCar]

Shit always seems to be associated with anything from ebay or china for some reason. Though i do agree to support forum vendors when possible.

 

[IJ.]

1st and 2nd Gen stuff out of China is usually not the best, 3rd Gen onwards they get it right.

 

[Poodles]

In this case it's the exact opposite. The DDP's don't have the actual divider flange now making them pointless.

Oh, and they fit for shit too.

 

[gotsomegetsome]

so because the ddp does not have a splitter thing in the middle, it is useless? There have been claims on other websites that having the ddp is pointless, and the full 3" pipe, without the dual wastegate pipe, is good enough if not better.

Anyone actually have proof of this?

 

[ForcedTorque]

I remember way back when Randy (BIC) first started making them, he posted some dyno comparisons. I wouldn't know how to find them, but I bet you could PM Randy and he could provide them for you.

On the contrary, do you believe you could get good information from the seller on ebay? Dual outlets...LOL!!!!!!!!!!!! 7MGE.....Even more LOL'age!!!!!!!!!!!!!

 

[GrimJack]

Yes, this has been proven.

Randy, the guy who runs BIC, took a stock Supra, put it on a dyno, recorded the numbers, put on a 3 inch non-divided pipe, put it back on the dyno, recorded the numbers, put on the divided pipe, put it back on the dyno, recorded the numbers, and published the whole works.

These were all back to back runs on *exactly* the same car, with exactly the same setup, on the same day. And the result? I quote: "Dyno results have shown gains of 29 whp over a standard 3 inch downpipe setup."

I dare the folks claiming it's *not* an improvement to post some actual evidence. So far they are posting opinions instead of facts.

 

[turbo87targa]

I went from a big mouth full 3" to the BIC ddp.

Turbo spooled faster, dunno if it pulled harder or not.

Sure sounds sexy cruising the neighborhood at 2000rpms hearing nothing but upspool tho :naughty:

 

[hvyman]

if they dont have the tab separating the the waste gate and turbine its a less flowing full 3in dp.

 

[Poodles]

Technicly it will still flow more since it's 3" + 1" pipe...

 

[kamikazemkiii]

Technicly it will still flow more since it's 3" + 1" pipe...

+2

 

[hvyman]

really? but then you have that center part vs a full 3in down pipe which at the turbo is much larger than 3 +1.

 

[Poodles]

The outlets on both are smaller than the piping size...

 

[hvyman]

I dont get how you figure? a full 3in dp is almost 2 3in pipes coming out of the turbo into 1 3in. Ddp just makes for 3in for the turbine and 1 for the waste gate separated. But when there is no tab there separating the 2, the air exiting goes straight into a wall.

 

[Poodles]

Look at the back of the turbo. The outlet for the turbine is 3" and the wastegate is 1" or smaller...

 

[hvyman]

i realize that but without the tab theirs nothing there to direct the flow into the pipes and the air is going to go every which way and cause more turbulence than just getting a full dp with more open area.

im not saying the ddp(w/tabs) is worse than a reg 3in dp im just saying with out the tab imo its worse.

 

[Poodles]

Well, they're not supposed to be without tabs, it's the whole point of a DDP...

 

[Supracentral]

Without the tab, it's an exhaust leak...