whos made big power on a t4 and small down pipe?
09-20-2018, 05:54 PM
#1
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whos made big power on a t4 and small down pipe? There seems to be a trend, not only on ls1 tech but alot of forums. im not trying to knock the borg turbos by any means, they are one of the best. but not every combo requires a t6 exhaust housing with a 96mm turbine and an 8 inch exhaust pipe. id like this thread to help reference what can really be done on a 75mm turbine wheel with a small diameter downpipe. sometimes i see people saying a 5.3 with choke with a 75mm turbine, or you need a 4 inch down pipe to make over 600whp. i know this isnt the case. i know some of you have made huge amounts of power, and went deep into the 8s on these small frame turbos with fairly small exhausts. id love to have some of you chime in, and just give a short rundown on your setup, and how far you were able to push it. i think it would be a great reference to people selecting turbos. thanks for any feedback guys!
09-20-2018, 06:31 PM
#2
the borgs are measured different than the others. a 83 mm borg turbine is a 76 mm when measured the same. that being said the t4 really has little difference in most cases. my nova has been 9.50@143 mph with a t4 borg with the small turbine on my 6.0 lq4, 3500 lb street car. but I run a 4" downpipe.
my buddys camaro has been 9.40 at 145 mph with a on3 78/75 and 3" downpipe on a 5.3 with 23 psi boost
don't know if that is big power but if you look up stock48 on here his nova has been low 8s on a borg t4 92 mm turbine.
my buddys camaro has been 9.40 at 145 mph with a on3 78/75 and 3" downpipe on a 5.3 with 23 psi boost
don't know if that is big power but if you look up stock48 on here his nova has been low 8s on a borg t4 92 mm turbine.
09-20-2018, 07:36 PM
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big power being relative to a t4 with a smaller turbine and exhaust. i know borg measures the inducer most others measure the exducer. was hoping people like stock48 would chime in, and i know theres more like him. i dont know these guys by name because i dont post on here much. but i figured this could make for a good thread. your buddys camaro is a good example, with that time it has to be making upwards of 650whp depending on weight? and thats through a 75mm turbine and a 3 inch downpipe
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09-21-2018, 01:09 PM
#8
Not that it matters a ton, but I'm pretty sure the "83mm" borg is a 74.3mm minor diameter wheel, not a 76mm... But yea borg stuff is backwards.
3" or 4" doesn't mean much. I can have a foot long straight shot down pipe that's 3" and it will flow better than a full length 4" system with muffler. A short 3" dump can make enough power to max most T4 setups with little gains to be had with a 4" pipe of the same length and diameter. Start throwing in multiple bends and mufflers and you need to bump up to larger diameter pipe.
3" or 4" doesn't mean much. I can have a foot long straight shot down pipe that's 3" and it will flow better than a full length 4" system with muffler. A short 3" dump can make enough power to max most T4 setups with little gains to be had with a 4" pipe of the same length and diameter. Start throwing in multiple bends and mufflers and you need to bump up to larger diameter pipe.
09-21-2018, 01:15 PM
#9
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~900 on the engine dyno with a 4-cylinder turbo dodge engine that was being built for the NHRA Sport Compact Hot Rod series with a billet 76mm and a 3" fender dump.
09-21-2018, 05:29 PM
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i would say that is pretty big power considering the turbo and downpipe sizing. whos 7675, precision? thanks for the replies guys. id love to hear from more like this ^ guy. i know theres more of you that have made a touch more power!
09-21-2018, 05:51 PM
#11
Yes, it was a billet wheeled precision. For what its worth, going to the 7875 on3 cost me nearly 50whp....but made the same torque. This was confirmed on the same dyno...before and after.
09-22-2018, 03:11 PM
#14
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There seems to be a trend, not only on ls1 tech but alot of forums. im not trying to knock the borg turbos by any means, they are one of the best. but not every combo requires a t6 exhaust housing with a 96mm turbine and an 8 inch exhaust pipe. id like this thread to help reference what can really be done on a 75mm turbine wheel with a small diameter downpipe. sometimes i see people saying a 5.3 with choke with a 75mm turbine, or you need a 4 inch down pipe to make over 600whp. i know this isnt the case. i know some of you have made huge amounts of power, and went deep into the 8s on these small frame turbos with fairly small exhausts. id love to have some of you chime in, and just give a short rundown on your setup, and how far you were able to push it. i think it would be a great reference to people selecting turbos. thanks for any feedback guys!
What do you class as big power and what do you class as a small downpipe ?
09-22-2018, 04:51 PM
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Reason people run the T6/96mm turbine is because 1. Any turbine with a T4 is alot more expensive then the T6/96mm. T4 housing is a upcharge and any turbine wheel other then 83mm (87/92) is also a upcharge.
with today's converter technology almost any combo can spool the T6/96mm so why pay more money to have alot mlre backpressure?
also another thing to add is the 83mm turbine wheel is probably only a good match for a cast 75mm... any of the bullet wheel 80-88mm turbos flow way more then the 83mm turbine is capable of on our v8 motors.
and all s400 turbos have a 5" DP exit so not many people are gonna bottle neck it down to a 3"... most go down to a 4" if they are limited in room
with today's converter technology almost any combo can spool the T6/96mm so why pay more money to have alot mlre backpressure?
also another thing to add is the 83mm turbine wheel is probably only a good match for a cast 75mm... any of the bullet wheel 80-88mm turbos flow way more then the 83mm turbine is capable of on our v8 motors.
and all s400 turbos have a 5" DP exit so not many people are gonna bottle neck it down to a 3"... most go down to a 4" if they are limited in room
09-22-2018, 05:54 PM
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Reason people run the T6/96mm turbine is because 1. Any turbine with a T4 is alot more expensive then the T6/96mm. T4 housing is a upcharge and any turbine wheel other then 83mm (87/92) is also a upcharge.
with today's converter technology almost any combo can spool the T6/96mm so why pay more money to have alot mlre backpressure?
also another thing to add is the 83mm turbine wheel is probably only a good match for a cast 75mm... any of the bullet wheel 80-88mm turbos flow way more then the 83mm turbine is capable of on our v8 motors.
and all s400 turbos have a 5" DP exit so not many people are gonna bottle neck it down to a 3"... most go down to a 4" if they are limited in room
with today's converter technology almost any combo can spool the T6/96mm so why pay more money to have alot mlre backpressure?
also another thing to add is the 83mm turbine wheel is probably only a good match for a cast 75mm... any of the bullet wheel 80-88mm turbos flow way more then the 83mm turbine is capable of on our v8 motors.
and all s400 turbos have a 5" DP exit so not many people are gonna bottle neck it down to a 3"... most go down to a 4" if they are limited in room
yes we can spool those big housings and wheels, no question there. but for someone shooting for 600, 700, even 800whp, could a different exhaust housing and wheel combo offer better spool characteristics or street manners? its all in what your going to do with the car i suppose.
not everyone has the room for a 5 inch, or even 4 inch down pipe. i went with 3 inch personally because i couldnt even fit 3.5.
i dont mean any offense to anyone at all, and im not trying to argue with anyone here, please dont take me the wrong way. i just wanted a good productive discussion so folks can really see what these smaller t4 turbos are capable of.
09-22-2018, 09:00 PM
#18
Reason people run the T6/96mm turbine is because 1. Any turbine with a T4 is alot more expensive then the T6/96mm. T4 housing is a upcharge and any turbine wheel other then 83mm (87/92) is also a upcharge.
with today's converter technology almost any combo can spool the T6/96mm so why pay more money to have alot mlre backpressure?
with today's converter technology almost any combo can spool the T6/96mm so why pay more money to have alot mlre backpressure?
09-23-2018, 03:52 AM
#19
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Your first post mentioned 600hp, now you're talking about 350hp....neither of those are remotely anything to do with big power.
And anyone saying you need 5" DP for those is clearly an idiot, likewise anyone saying you can only make 350 with a 3" DP.
And there are many T4 variants available and good ones can easily make 4 figures....and no T4 is ever setup for 5" DP in the first place
So the question is extremely vague...if there is even a real question in there that hasnt already been covered dozens of times
09-23-2018, 08:01 AM
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Your first post mentioned 600hp, now you're talking about 350hp....neither of those are remotely anything to do with big power.
And anyone saying you need 5" DP for those is clearly an idiot, likewise anyone saying you can only make 350 with a 3" DP.
And there are many T4 variants available and good ones can easily make 4 figures....and no T4 is ever setup for 5" DP in the first place
So the question is extremely vague...if there is even a real question in there that hasnt already been covered dozens of times
And anyone saying you need 5" DP for those is clearly an idiot, likewise anyone saying you can only make 350 with a 3" DP.
And there are many T4 variants available and good ones can easily make 4 figures....and no T4 is ever setup for 5" DP in the first place
So the question is extremely vague...if there is even a real question in there that hasnt already been covered dozens of times
there is no question in this thread. i just thought it would be an interesting discussion, and a way for people doing research to see what the smaller t4 turbos are capable of. like previously stated. some people cant physically fit a borg warner turbo or a 5 inch DP. i would just like to hear from more people who have made good numbers,dyno or track times, from a t4 turbo such as the 7675 precision or on3 7875.