1UZ-FE Exhaust system: Tech & upgrades
#65
Lexus Champion
Thread Starter
Originally posted by retrodrive
Those 2 bends at the rear part of the exhausts look kind-of sharp. Is there no way to straighten the whole thing a little bit more or there is no need to?
Those 2 bends at the rear part of the exhausts look kind-of sharp. Is there no way to straighten the whole thing a little bit more or there is no need to?
Actually, the design was dictated by the area available for mid-car silencer/mufflers. I want to run mufflers here as this will (hopefully) allow me to keep the stock final mufflers for near silent normal operation and a quick 10 minutes later, drop off those to run a VERY low restriction system that can still be driven by a cop car without getting pulled over
This system is actually built so that I can run various configurations and test both sound level, quality and performance. Once I determine the best overall system I hope to offer duplications to those interested. With minor mods this should be adaptible to ALL year and model Lexus V8 cars including LS, GS and SCs.
#68
Lexus Champion
Thread Starter
Re: Weight?
Originally posted by Japanimal
Will the exhaust you have planned be any lighter than the stock setup??
Will the exhaust you have planned be any lighter than the stock setup??
I will also build some straight pipes from the center mufflers (previously the silencer position) and try them in different sizes including 2.00", 2.25" and 2.50" to see if there is a performance change.
#69
Lexus Champion
Thread Starter
Originally posted by persian451
that setup shows you only have 2 cats... however on the 91s i know have the third cat where you x pipe is located...
that setup shows you only have 2 cats... however on the 91s i know have the third cat where you x pipe is located...
#70
Pole Position
how much would i gain if i just replaced the 2 back mufflers w/ straight through mufflers and had the resanator taken out and replaced w/ straight pipe? (i already took off 2 muffs)
#71
Guest
Posts: n/a
Nobody here has done any official dyno testing with each part of the exhaust removed separately.
You can only speculate and estimate how much of a gain you will get. Otherwise it's time for testing with some kind of metering device like a G-tech or a dyno run.
You can only speculate and estimate how much of a gain you will get. Otherwise it's time for testing with some kind of metering device like a G-tech or a dyno run.
#72
Lexus Champion
Thread Starter
Originally posted by lspower
how much would i gain if i just replaced the 2 back mufflers w/ straight through mufflers and had the resanator taken out and replaced w/ straight pipe? (i already took off 2 muffs)
how much would i gain if i just replaced the 2 back mufflers w/ straight through mufflers and had the resanator taken out and replaced w/ straight pipe? (i already took off 2 muffs)
I would suggest that between 7-15hp and similar torque is available if you do the merges correctly. If you do them incorrectly you can actually loose power.
For a first gen 250hp (rated, 230hp more realistic) 1UZ-FE... I would suggest going with a high flow 2" into 2.5" Y-pipe with about 2 feet of 2.5" center piping (either straight pipe or straight through resonator like a Magnaflow or Ultraflow) and then Y it back into duals. You could go with 2.25" like me and in fact an SC400 owner claims to have accross the board gains with dual 2.5" pipes but I would suggest that you will almost certainly give up low RPM torque and make the car feel slower around town.
If you want me to build you some pipes PM me.
#73
Originally posted by jbrady
Lee is correct in saying that no official testing is posted on this site anyway.
I would suggest that between 7-15hp and similar torque is available if you do the merges correctly. If you do them incorrectly you can actually loose power.
For a first gen 250hp (rated, 230hp more realistic) 1UZ-FE... I would suggest going with a high flow 2" into 2.5" Y-pipe with about 2 feet of 2.5" center piping (either straight pipe or straight through resonator like a Magnaflow or Ultraflow) and then Y it back into duals. You could go with 2.25" like me and in fact an SC400 owner claims to have accross the board gains with dual 2.5" pipes but I would suggest that you will almost certainly give up low RPM torque and make the car feel slower around town.
If you want me to build you some pipes PM me.
Lee is correct in saying that no official testing is posted on this site anyway.
I would suggest that between 7-15hp and similar torque is available if you do the merges correctly. If you do them incorrectly you can actually loose power.
For a first gen 250hp (rated, 230hp more realistic) 1UZ-FE... I would suggest going with a high flow 2" into 2.5" Y-pipe with about 2 feet of 2.5" center piping (either straight pipe or straight through resonator like a Magnaflow or Ultraflow) and then Y it back into duals. You could go with 2.25" like me and in fact an SC400 owner claims to have accross the board gains with dual 2.5" pipes but I would suggest that you will almost certainly give up low RPM torque and make the car feel slower around town.
If you want me to build you some pipes PM me.
since u know we hv the same model of LS, plus i hv the rear muffler already... I m not kidding pls build one for me!!!
#75
Lexus Test Driver
how much do you think the piping alone costs? must I change the mufflers when doing this to the 1st gen
Originally posted by jbrady
Lee is correct in saying that no official testing is posted on this site anyway.
I would suggest that between 7-15hp and similar torque is available if you do the merges correctly. If you do them incorrectly you can actually loose power.
For a first gen 250hp (rated, 230hp more realistic) 1UZ-FE... I would suggest going with a high flow 2" into 2.5" Y-pipe with about 2 feet of 2.5" center piping (either straight pipe or straight through resonator like a Magnaflow or Ultraflow) and then Y it back into duals. You could go with 2.25" like me and in fact an SC400 owner claims to have accross the board gains with dual 2.5" pipes but I would suggest that you will almost certainly give up low RPM torque and make the car feel slower around town.
If you want me to build you some pipes PM me.
Lee is correct in saying that no official testing is posted on this site anyway.
I would suggest that between 7-15hp and similar torque is available if you do the merges correctly. If you do them incorrectly you can actually loose power.
For a first gen 250hp (rated, 230hp more realistic) 1UZ-FE... I would suggest going with a high flow 2" into 2.5" Y-pipe with about 2 feet of 2.5" center piping (either straight pipe or straight through resonator like a Magnaflow or Ultraflow) and then Y it back into duals. You could go with 2.25" like me and in fact an SC400 owner claims to have accross the board gains with dual 2.5" pipes but I would suggest that you will almost certainly give up low RPM torque and make the car feel slower around town.
If you want me to build you some pipes PM me.