legacycentral bbs

ok hear is my down pipe it is 5in wide & it is a stright pipe all the way out till the end tip. where the o2 sensore is u can see the extra width it opens the wastedgate side wright open it is the same size as the gasket all open NO JOKE it gave me 30hp clean i was scared the first time driveing it. it was that fast. 4 pepole that ask what mod should theny do first or if u havent done it yet GET THIS DONE thanks legacy777

Is that custom?

it's gotta be.. look how ugly that beast is.

j/k nico, you got a lot of airflow through there which is cool. I don't know if i agree with the crimped exhaust down at the bottom of your DP tho.

i didnt agree wit the pipe eather but the guy who made the down pipe makes transport truck turbo stuff so he siad it will work good. he siad the pipe is hard to bend on that angle cuz its to big & the turbo is pushed back a bit more then it was factory. he also siad that the flow will be better cuz it makes like a vacum pull spirell exit so it sucks its way out. for me it might look ugly but wow do u get mad horse power out of that down pipe. when i gave the guy the factory flange he new wright away what i wanted to do & he siad come back cuz i whant to go 4 a ride its like he already.

I am fabing up my 3" down pipe at this time. I am using 3" stainless mandrel bends. I think there is plenty of room to work with.

wow... havent see a post like this in a while. *Cracks Knuckles* Just a few questions here.... did you dyno test that 30hp?? Why a 4in pipe and then feed to smaller mid pipe? Why would 30hp in a 2900lb car make you scared to drive it? As much as id like to go along with this wet dream... if the engine code isnt 13BT... its not going to gain very much from just a HUGE downpipe. After 3in, all your doing is decreasing spool time making it closer and closer to 0 exhaust flow resistance. Thus if you have the stock turbo, you have done nothing but wasted some perfectly good weld. Please clarify all your mods and reasoning for this particular mod.

Redline Dreamz wrote: wow... havent see a post like this in a while. *Cracks Knuckles* Just a few questions here.... did you dyno test that 30hp?? Why a 4in pipe and then feed to smaller mid pipe? Why would 30hp in a 2900lb car make you scared to drive it? As much as id like to go along with this wet dream... if the engine code isnt 13BT... its not going to gain very much from just a HUGE downpipe. After 3in, all your doing is decreasing spool time making it closer and closer to 0 exhaust flow resistance. Thus if you have the stock turbo, you have done nothing but wasted some perfectly good weld. Please clarify all your mods and reasoning for this particular mod.

you obviously don't have a turbo car yes you will lose some bottom end but the top end gains are enormous. my dump is 4 1/2" at turbo back into 3" dump, the reason for that size is because thats the size of the void at the back of the turbo. quoting figures like 30hp is a bit silly not being tested on a dyno, but lay off dude, it does make a HUGE difference and was the best modification to my RS I have done, my car has done a 13.7 on the 1/4 at 99mph. all I have done is exhaust pod and a bit of boost.
NICO : seriously did the guy that made your dump pipe use a hammer to make that? geez looks a bit rough I am sure it works good though

hey rsstiboy, you said you run a 13.7 1/4 mile. Thats really good. You mentioned your exhaust is modified, what exactly have you done to it? And how much boost are you running, ~15psi? Are those the only mods?

Thanks,
mark

I ran the 13.7 with MY99 STi gear ratios on 1st 2nd and reverse (mainshaft), running 15psi, 3" custom exhaust, single downpipe with splitter, 4 1/2" at turbo back, high flow cat and 5" stainless cannon out the back, lightened flywheel, heavy duty clutch, shortened and modified intake with pod filter, its aus spec so it has the RS water/air cooler, VF12 turbo, STi engine mounts, Legacy GT-B radiator, oh yeah and I ran that time in full street trim with 17" wheels on with full tank of fuel. My car now runs 17-18psi and I will be going down the 1/4 again in about a week.

Is the VF 12 the same as the IHI RHB5?

Thanks,
Mark

i believe so..... although i think they came out in a couple of different trims - one was the VF10 the other was the VF12. I think they are both RHB5 but don't quote me.

since when did this --

"MY99 STi gear ratios on 1st 2nd and reverse (mainshaft), running 15psi, 3" custom exhaust, single downpipe with splitter, 4 1/2" at turbo back, high flow cat and 5" stainless cannon out the back, lightened flywheel, heavy duty clutch, shortened and modified intake with pod filter, its aus spec so it has the RS water/air cooler, VF12 turbo, STi engine mounts, Legacy GT-B radiator"

become equal to this --

"all I have done is exhaust pod and a bit of boost"

Im not usually one to flame but this is just too good to pass up. Your right though, i dont have a turbo car, but im a real tuner and know better than to trust the HUGE top end gains guaged by means of the Butt Dyno. If you can show me a drastic improvement on the powerband on a dyno sheet then ill believe it.... other wise your just waisting your time upgrading to an exhaust large enough for over 1800cfm of exhaust gas to flow thru.

oh, I forgot to say the lightened flywheel, big deal. with turbos they don't rely on back pressure as much as N/A cars, so basically with a turbo car from the turbo the bigger the exhaust the better. don't bother arguing until you get the same conclusion from a turbo car tuner . go back to playing with your toy N/A cars. I have never dynoed my car, but before i did the exhaust I was doing consistent 15.3's at around 86 MPH after the exhaust I was doing 13.7s at 98-99MPH don't try to tell me there is no top end gains from a big exhaust. on the same settings too, 15psi and pod.

bigger for turbo's is not always better if you're building a torque motor. Smaller exhaust will give you better low end torque, yes it will decrease the hp at the top end.....but it's all about what you want to setup the motor to do best.

Best setup would be to find an intermediate size that gives you the best of both worlds.

i.e. 3" mandrel bent exhaust with full opening at turbo back (which is 4 1/2") into 3" with gradual reduction in size from the turbo back over about 1 foot length of pipe.

single dump for max horsepower
double dump for track work - more even torque spread.

ok now im gonna turn on the spot light.

15.3@86mph??? HOW DID YOU PULL THAT OFF??
13.7@99mph??? HOW DID THAT HAPPEN??

WHAT THE HELL ARE YOUR 60FT TIMES... 1.0???

Fact of the matter is, those trap speeds do no even come remotely close to those ETs. I ran a 15.72@86 mph with a 2.147 60ft, and a 15.12@90.11 with a 2.103 60ft... and a 13.9 should be about 102-103mph.

Now, PUHLEAZ explain to ME how your managing 6 tenths faster at the same mph stock for stock and are managing a 13.7 at tapspeeds for 14.3?? Does your car have a flux capacitor that helps it dfy the laws of physics??? Im mean really, lets see some video, time slips, dyno sheets, SOME SORT OF PROOF to show your claims.

Just in case, heres a link to my car which has all my timeslips that ive aquired. http://www.j-body.org/members/wa2fast/cars/1/

ball is your court

It did a 13.790 at 98.62mph at 23 degrees ambient 33degrees track temp with a 1.947 60ft, that was straight off my timeslip at 15psi, obviously the temperatures are in celsius not farenheit. basically the laws of physics like AWD and redline clutch dumps don't forget my car is an Australian RS with water/air cooler and VF12 turbo.

so does that mean you dont have any video, or slips to share with us??

Better still, of these 2 runs, list the following in this order.....

RT
60ft
330ft
1/8
1/8 MPH
1000ft
1/4
1/4 MPH

From this alone i should be able to picture how your run would look as you describe it.
[/b]

Redline, chill. I've never seen someone get so up in arms over something like trap speeds. You're obviously not familiar with turbocharged engines and AWD. Their torque bands, etc... are waaaay different than NA. Why doubt something so insignificant? I'm sure he has the slip, and a scan of it would be great to stop this argument. Remember, this isn't a Mustang or whatever the heck it is you work on.

There is nothing wrong with not believing someone, but do you have to tell them that they are absolutely wrong? Maybe they misquoted, are misinformed, or are bald-face liars... but being so harsh makes you eat your words if it ends up YOU are wrong.

I'm not doubting anyones mechanical knowledge. Just play nice. Next time just ask for all of his numbers, no need to treat him like some Ricer that claims his Civic does 14.7 without the NOS (but subsequently pulls a 17.2 and cant explain why... true story )

Discussion = over
thread = locked