Exhaust back pressure - some things to consider

[Busky2k]

Just remove it and shine a torch through. It shouldnt be too hard to remove, otherwise a workshop could pull it off for a small fee.

[JasonO]

Steve,

Top Result

Guys,

I made the change from a NISMO 80mm performance system to a HKS Ti Drag System, and managed to dyno the before and after. I was running the stock turbine, and the results can be seen over on the www.gtr.co.uk forums.

Some details of the exhaust system here

and the dyno graphs are here

[rob77]

Well I just got my car back from being rebuilt and it seems louder and more throaty than before (even though it shouldnt, its probably because I havent driven it for a long time ) We did a before and after dyno when I fitted just the cat back section of my N1 and I gained in the region on 18kw@wheels all up this was the first mod I did and I'm sure all the mods after have gained more for it Just hope I dont get pulled over cause then I will have to put a resonator on the system.

[Steve]

As a comparison, here is a more recent dyno with my dyno before the exhaust swap overlayed

[WLD747]

Would a twin 2.5 exhaust cat back system, prevent exhaust back pressure?

= cat

/

/ exhaust pipe

N N muffler

would it help the car breath better?

[DJ_L3ThAL]

whats it with you a twin stuff lol

[WLD747]

Ive seen a few around and was wondering plus it looks kool :wassup:

whats it with you a twin stuff lol

[meggala]

the apex dual n1 it theebest exhast for guaranteed Performance there was even a dyno graph produced by apex to back this up . but they are really really loud.

my sr followed the advice of this thread I ahve a 3 split dump 3" mandrel front pipe hiflow 3" cat to a hybrid hap based exhasut I get boost pressure from 2100 rpm full boost from 3200 and on the dyno chart from the factory they reckoned full boost from 4100 rpm. bizzare but I love it . thanks for the tips steve the advice was followed .

meggala

[WLD747]

sounds good is there a link to this review?

the apex dual n1 it theebest exhast for guaranteed Performance there was even a dyno graph produced by apex to back this up . but they are really really loud.

my sr followed the advice of this thread I ahve a 3 split dump 3" mandrel front pipe hiflow 3" cat  to a hybrid hap based exhasut I get boost pressure from 2100 rpm full boost from 3200 and on the dyno chart from the factory they reckoned full boost from 4100 rpm. bizzare but I love it . thanks for the tips steve the advice was followed .

meggala

[WLD747]

Here you go boys;

"The N1 Duel are designed to retain the same peak HP of the single N-1 while improving mid range torque.N-1 Dual Mufflers are a variant of the popular single-tip N-1 Series Mufflers. The N-1 Dual piping splits into two smaller diameter pipes just after the catalytic converter and flow into a pair of 120mm canisters. The canisters are polished off with aggressive 90mm tips. The use of smaller piping diameter helps retain more mid-range torque. The Dual N-1 does not sacrifice peak horsepower because the dual pipes can handle more exhaust gas volume. Piping is treated with high-temperature titanium particle coating, and the canisters and tips are constructed of polished SUS 304 stainless steel."

Im gona be getting this done :wassup:

[DJ_L3ThAL]

WLD747 dude your best time in your sig is 13.58 right, but arent you running PowerFC base maps ?

[R31Nismoid]

:alien:

[[ant]]

yeah, the general knowledge is pretty much 3" pipe the whole way back with as little other restrictions such as cats in the way. i have an 83 car now so i can have just 3" all the way back and then muffler. i had stock dump and front pipe and stock old little cat in there, got the dump and front made 3' and the cat removed, picked up a bit more top end a bit of response, havent dynoed it after it though for any hard proof of difference.

[WLD747]

13.58 is correct with pfc base maps @ 12psi, Not bad a!. Considering i had my 2 12'' subs in the car as well.

should be a very low 13 this weekend :aroused:

WLD747 dude your best time in your sig is 13.58 right, but arent you running PowerFC base maps ?

[DJ_L3ThAL]

dude, not bad, thats ****ING BAD!!! you idiot your gunna kill your car, STOP DRIVING ON THE FARKEN POWERFC BASE MAPS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!1 they are made for seeing that the car starts n idles, NOT FOR DRIVING ON AT ALL!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[WLD747]

RELAX, DJ_L3ThAL Its gona go for a dyno tune this weekend. Then i should pull a good 1/4 mile. . I just havent had any free time cause of work and this weekend i will.

dude, not bad, thats ****ING BAD!!! you idiot your gunna kill your car, STOP DRIVING ON THE FARKEN POWERFC BASE MAPS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!1 they are made for seeing that the car starts n idles, NOT FOR DRIVING ON AT ALL!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[DJ_L3ThAL]

i still dont believe ANYONE can pull a 13.58 on a powerfc base map with the mods you have bro, im taking mine to calder soon a got a few more mods than you and i rekon i'd struggle to get low 13s

[WLD747]

if you go calder i'll tag along. Maybe we should do a skyline australia calder thing. :wassup:

i still dont believe ANYONE can pull a 13.58 on a powerfc base map with the mods you have bro, im taking mine to calder soon a got a few more mods than you and i rekon i'd struggle to get low 13s

[WLD747]

theres is a guy here doing a 13.3 with base map as well look in the drag section.

[DJ_L3ThAL]

two people that just dont get it then.... your gunna kill your cars...