what size single turbo for a 427
#1
what size single turbo for a 427
goal of 1000+RWHP. plannimg on a garret ball bearing turbo was looking at 45r up to 47r. dont know what to do about ar sizes and and compressor sizes. T4 or T6? id like to use a T4 so my downpipe can be a 4" and i can easily wrap that through my Spohn k member...just need some input form the pros...
#5
You will need a T6 with a 427 and 1000rwhp. Also check on the FI-91X, or FI-94X. Also if you have some $$ left, go with the EX-94X billet turbo. Awesome piece....
The GT47-88 will NOT make 1000rwhp on a 427. Probably be done around 850-900max.....back pressure will be high with it!
The GT47-88 will NOT make 1000rwhp on a 427. Probably be done around 850-900max.....back pressure will be high with it!
#6
LS1Tech Co-Founder
iTrader: (34)
A friend made 920 on a load dyno with a 408ci, race gas and a GT47-88. I would think that a GT55-91 would be a better choice if focusing on Garrett parts.
I made 867rwhp with my GT47-88 and a 348ci they can make 1300hp I think.
I made 867rwhp with my GT47-88 and a 348ci they can make 1300hp I think.
Trending Topics
#8
You will need a T6 with a 427 and 1000rwhp. Also check on the FI-91X, or FI-94X. Also if you have some $$ left, go with the EX-94X billet turbo. Awesome piece....
The GT47-88 will NOT make 1000rwhp on a 427. Probably be done around 850-900max.....back pressure will be high with it!
The GT47-88 will NOT make 1000rwhp on a 427. Probably be done around 850-900max.....back pressure will be high with it!
also are the FI-X turbos ball bearing?
#9
FormerVendor
iTrader: (3)
Join Date: Jun 2007
Location: Virginia Beach,Virginia
Posts: 2,991
Likes: 0
Received 2 Likes
on
2 Posts
on smaller turbos you need to spin the turbo faster to make boost-the faster you spin the turbo the higher the exhaust backpressure becomes-killing power,while an 88 might make 1200hp it doesnt make it on every size engine
#10
understood! so i guess im looking at the GT55R turbo. i really want it to be a ball bearing turbo which is why i guess im staying in the garret family. no would i have any problems using a 5"-4" reducer off of the turbine side so that i can use a single 4" down pipe still?
i just barely have room for 4"s so 5" would not work all the way. also what AR should my turbine housing be?
damn looking at the price of this turbo so far the cheapest brand new from a dealer price is $3700.
i just barely have room for 4"s so 5" would not work all the way. also what AR should my turbine housing be?
damn looking at the price of this turbo so far the cheapest brand new from a dealer price is $3700.
#13
FormerVendor
iTrader: (3)
Join Date: Jun 2007
Location: Virginia Beach,Virginia
Posts: 2,991
Likes: 0
Received 2 Likes
on
2 Posts
understood! so i guess im looking at the GT55R turbo. i really want it to be a ball bearing turbo which is why i guess im staying in the garret family. no would i have any problems using a 5"-4" reducer off of the turbine side so that i can use a single 4" down pipe still?
i just barely have room for 4"s so 5" would not work all the way. also what AR should my turbine housing be?
damn looking at the price of this turbo so far the cheapest brand new from a dealer price is $3700.
i just barely have room for 4"s so 5" would not work all the way. also what AR should my turbine housing be?
damn looking at the price of this turbo so far the cheapest brand new from a dealer price is $3700.
#14
ya its a stick...i know it will be a beast on the street but i like a challenge. as for compression i will be shooting for 8.5:1 maybe even lower i have not decided yet as i do want to run it on pump gas to hit 800+RWHP. as for cam im gonna have to discuss it over with my tuner. car is fully built and ready for the power just need to start piecing together a turbo kit and then switch whatever i need to switch in the motor. aaaannnd im hoping that turbo will fit where up front where my battery used to be... anyone have any real time pics of a gt55R or equivalent (physical) size turbo that i can look at? maybe do the old compare it to a coke can or a nything so i can get an idea of the turbo's actual size? if i cant get that to fit in the area my battery was then i am already running into problems...
#15
Also HP ratings should have a big * beside them. they are based on peak efficiency.
#16
LS1Tech Co-Founder
iTrader: (34)
You can fit a big turbo up by where battery is, a few cars have done that.
800rwhp with a T56, 427ci, and a turbo on pump is doable on the dyno but at the track you should run race gas since the car will be under load for a 1/4 mile and that's different then running a dyno hard for 3 seconds.
800rwhp with a T56, 427ci, and a turbo on pump is doable on the dyno but at the track you should run race gas since the car will be under load for a 1/4 mile and that's different then running a dyno hard for 3 seconds.
#17
ya its a stick...i know it will be a beast on the street but i like a challenge. as for compression i will be shooting for 8.5:1 maybe even lower i have not decided yet as i do want to run it on pump gas to hit 800+RWHP. as for cam im gonna have to discuss it over with my tuner. car is fully built and ready for the power just need to start piecing together a turbo kit and then switch whatever i need to switch in the motor. aaaannnd im hoping that turbo will fit where up front where my battery used to be... anyone have any real time pics of a gt55R or equivalent (physical) size turbo that i can look at? maybe do the old compare it to a coke can or a nything so i can get an idea of the turbo's actual size? if i cant get that to fit in the area my battery was then i am already running into problems...
http://www.theturboforums.com/smf/in...topic=108600.0
Here is the FI-91X...
http://www.turbobuick.com/forums/1928046-post39.html
#19
You can fit a big turbo up by where battery is, a few cars have done that.
800rwhp with a T56, 427ci, and a turbo on pump is doable on the dyno but at the track you should run race gas since the car will be under load for a 1/4 mile and that's different then running a dyno hard for 3 seconds.
800rwhp with a T56, 427ci, and a turbo on pump is doable on the dyno but at the track you should run race gas since the car will be under load for a 1/4 mile and that's different then running a dyno hard for 3 seconds.
#20
LS1Tech Co-Founder
iTrader: (34)
The end goal is 800rwhp on 93 pump, so plan on building a combo that make 800rwhp on pump, and can make more on race gas. I think the mistake that some have made is to create a maxed out combo that made 800rwhp on the dyno a couple of times but with a big dollop of timing and with little to no regard for the IAT's.
Who is your engine builder/tuner/kit builder? See what they say but I'd be planning on a 427ci that is around 8.5:1 - 9:1, run a 91 turbo, a good A/A (I hear that some shops really like the Bell cores), and a thorough fuel system.
Who is your engine builder/tuner/kit builder? See what they say but I'd be planning on a 427ci that is around 8.5:1 - 9:1, run a 91 turbo, a good A/A (I hear that some shops really like the Bell cores), and a thorough fuel system.