2 questions that really need to be answered
#1
Full Member
Thread Starter
Join Date: Oct 2002
Location: Fairfax, VA
Posts: 214
Likes: 0
Received 0 Likes
on
0 Posts
2 questions that really need to be answered
first of all if i get a down pipe and mid pipe i heard that your car starts to smell like gas. if this is true is it really bad and is there anyway to get rid of it. second of all is it true that twin turbos always spool up faster than single turbos even if they are ball bearing. if this is true can someone please explain thanxs
#2
5yr member, joined 2001
A downpipe won't make your exhaust smell like half-burnt fuel. A midpipe will. This is because the midpipe is a straight-pipe that replaces your catalytic coverter. Without a catalytic converter, your exhaust will be untreated. As a result, you will have much larger amounts of ozone, carbon monoxide, and unburnt hydrocarbons (the smelly stuff) entering into the atmosphere from your exhaust.
#3
Tunning till I drop!
iTrader: (34)
I'll have a crack at the spool up question. All you 1000 post experts correct me if I'm wrong.
The two sequential turbos in the stock setup of our cars don't spool faster ... they reach peak boost faster. This is because the engine’s exhaust need only spin one smaller turbo, then at 4500RPM's with all of the extra exhaust associated with the higher RPMs spin two.
A single turbo has to be capable of pushing more air, is larger that the stock twin's, requires more exhaust to spool and thus takes more time to boost or spool up to generate boost.
I know … it sounds like the single spools slower, but only because it’s receiving a smaller amount of exhaust given it’s size. If it was suddenly dropped into the picture at 4500 RPMs I don’t see why it wouldn’t spool up just as fast as a single at 2000 RPMs.
The two sequential turbos in the stock setup of our cars don't spool faster ... they reach peak boost faster. This is because the engine’s exhaust need only spin one smaller turbo, then at 4500RPM's with all of the extra exhaust associated with the higher RPMs spin two.
A single turbo has to be capable of pushing more air, is larger that the stock twin's, requires more exhaust to spool and thus takes more time to boost or spool up to generate boost.
I know … it sounds like the single spools slower, but only because it’s receiving a smaller amount of exhaust given it’s size. If it was suddenly dropped into the picture at 4500 RPMs I don’t see why it wouldn’t spool up just as fast as a single at 2000 RPMs.
#4
Stock SEQUENTIAL twins will spool faster than non-sequential. (parrell) This is same for Single Turbos. That is the beauty of the twin system. Good power at low rpms.
Usually single turbo owners don't really worry about turbo lag because of the huge amount of power they are producing when they do infact hit boost.
Usually single turbo owners don't really worry about turbo lag because of the huge amount of power they are producing when they do infact hit boost.
#5
Junior Member
Join Date: Nov 2002
Location: Pasadena, CA, USA
Posts: 33
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by James Paventi
The two sequential turbos in the stock setup of our cars don't spool faster ... they reach peak boost faster. This is because the engine’s exhaust need only spin one smaller turbo, then at 4500RPM's with all of the extra exhaust associated with the higher RPMs spin two.
I know … it sounds like the single spools slower, but only because it’s receiving a smaller amount of exhaust given it’s size. If it was suddenly dropped into the picture at 4500 RPMs I don’t see why it wouldn’t spool up just as fast as a single at 2000 RPMs.
The two sequential turbos in the stock setup of our cars don't spool faster ... they reach peak boost faster. This is because the engine’s exhaust need only spin one smaller turbo, then at 4500RPM's with all of the extra exhaust associated with the higher RPMs spin two.
I know … it sounds like the single spools slower, but only because it’s receiving a smaller amount of exhaust given it’s size. If it was suddenly dropped into the picture at 4500 RPMs I don’t see why it wouldn’t spool up just as fast as a single at 2000 RPMs.
Also, the sequential setup begins spinning both turbos simultaneously (not the secondary later like you're implying), that is why it transitions so quickly to the secondary turbine. Otherwise, you'd still get lag, no matter how small the secondary turbine is.
Kento
#6
Senior Member
the spooling depends on the pitch and size of the exhaust blades as well as the intake cartridge fins. size of ports relative to stock size, and if there are any modifications. time and temperature also play an important role in a turbo's ability to spool.
samller ones will spool quickly, mainly due to the smaller amount of mass that needs to be moved, and and the relatively small passages that the air will be traveling through.
there are some very quick spooling big singles out there, and yes, many of them are BB units, but the down side to them is that they can not be rebuilt...
samller ones will spool quickly, mainly due to the smaller amount of mass that needs to be moved, and and the relatively small passages that the air will be traveling through.
there are some very quick spooling big singles out there, and yes, many of them are BB units, but the down side to them is that they can not be rebuilt...
#7
Lives on the Forum
Join Date: Dec 2001
Location: San Lorenzo, California
Posts: 14,716
Likes: 0
Received 8 Likes
on
8 Posts
Originally posted by JONSKI
A downpipe won't make your exhaust smell like half-burnt fuel
A downpipe won't make your exhaust smell like half-burnt fuel
Shabib67: I think you need to spend a little more time searching and thinking before you post. Those "two questions that need to be answered" have been answered many times before.....like last week. I don't mean to pick on you personally but it seems like all of your posts have been of this nature. You're not the only one by a long shot but.....
Thread
Thread Starter
Forum
Replies
Last Post
Nosferatu
2nd Generation Specific (1986-1992)
7
09-05-15 02:13 PM