Single 106+mm or twin 91mm...
Thread Starter
Teching In
Joined: Sep 2010
Posts: 12
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From: Australia
Single 106+mm or twin 91mm... Hey everyone,
This is my first post so please forgive me if i leave out some information.
Now as i live in Australia i have a Holden commodore ute which previously had a built LS1 with a single turbo making around 450rwkw (614hp) on low boost.
Unfortunatly due to a bad performance shop that motor went bang so i have stepped it up and gone for a 427ci LSX block with a the best of the best.
its has a 3000hp fuel system, Fully built custom T400 with transbrake, custom rear end etc.
Now everything is complete and the motor is in the car but i have been having a hard time deciding between deciding if i should go a single or a twin configuration.
The car is used primareraly for racing but needs to be able to be driven on the street as there are some street meets that i attend.
Obviously with turbos this size im looking to run well past the 1000whp mark with the motor built to take 30psi all day everyday that will not be a problem.
if you could give me some real world information, your thoughs about each setup and particular brands (here we really only use garrett but looking to expand to something new) that would be great.
Cheers.
This is my first post so please forgive me if i leave out some information.
Now as i live in Australia i have a Holden commodore ute which previously had a built LS1 with a single turbo making around 450rwkw (614hp) on low boost.
Unfortunatly due to a bad performance shop that motor went bang so i have stepped it up and gone for a 427ci LSX block with a the best of the best.
its has a 3000hp fuel system, Fully built custom T400 with transbrake, custom rear end etc.
Now everything is complete and the motor is in the car but i have been having a hard time deciding between deciding if i should go a single or a twin configuration.
The car is used primareraly for racing but needs to be able to be driven on the street as there are some street meets that i attend.
Obviously with turbos this size im looking to run well past the 1000whp mark with the motor built to take 30psi all day everyday that will not be a problem.
if you could give me some real world information, your thoughs about each setup and particular brands (here we really only use garrett but looking to expand to something new) that would be great.
Cheers.
If you're looking for 1000rwhp and you want to drive on the street then you should look
for single 94 - 98.
Twin 91mm is way too much you can 2500hp with those turbos.
Oh Welcome ..
for single 94 - 98.
Twin 91mm is way too much you can 2500hp with those turbos.
Oh Welcome ..
Thread Starter
Teching In
Joined: Sep 2010
Posts: 12
Likes: 0
From: Australia
Thanks for the welcome.
Yes i understand that i can make the power with smaller single 88mm or even twin 76mm in saying that i dont want to come on here being new and be like i want to make 2000hp and sounds like some arrogant a**. I am new and i dont want to get anyone off side.
What i want is for the car to make up around the 2000hp but im not fixated on any particular number but im looking for the most power i can achieve with this motor which is built for some serious boost and i think realistically the motor will be fine getting close to that level.
Yes i understand that i can make the power with smaller single 88mm or even twin 76mm in saying that i dont want to come on here being new and be like i want to make 2000hp and sounds like some arrogant a**. I am new and i dont want to get anyone off side.
What i want is for the car to make up around the 2000hp but im not fixated on any particular number but im looking for the most power i can achieve with this motor which is built for some serious boost and i think realistically the motor will be fine getting close to that level.
Welcome aboard.
Twin 88s (S88, ST88, SX88
I don't know anything about the different models) would probably serve you well if the motor can flow the air (and you say it has the best so that should not be a problem). Twin 88s could easily get you 1500 rwhp.
Some street driveability will be all in the tune and the turbo(s) will not matter much.
PM Dr. Turbo here and he will surely point you in the right direction!!
Twin 88s (S88, ST88, SX88
I don't know anything about the different models) would probably serve you well if the motor can flow the air (and you say it has the best so that should not be a problem). Twin 88s could easily get you 1500 rwhp. Some street driveability will be all in the tune and the turbo(s) will not matter much.
PM Dr. Turbo here and he will surely point you in the right direction!!
twin 91's are a bit big for a 427,especially if you only want to make 2000hp.You could easily make that with twin 76's and have something that drives alot better with easier spool up.The single 106 will easily handle the task as well.Alot of it comes down to packaging,sometimes it easier to fit 2 smaller turbos than one large one.
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Teching In
Joined: Sep 2010
Posts: 12
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From: Australia
Thanks for your thoughts so far guys guys.
I had been thinking all along that i wanted to go the single turbo route but i had been told to go twins by my engine builder which i wasnt so keen on doing but thought i should atlease get some information.
In regards to a single what do you think would be an the best option avaliable?
Obviously billet and ball bearing if the option is there.
Turbonetics, precision, garrett any others im missing?
106,114,122...F-trim, G-trim???
Price isnt an issue im just looking for the best of the best.
In Aus no one will give you an honest review about a turbo unless its garrett.
I had been thinking all along that i wanted to go the single turbo route but i had been told to go twins by my engine builder which i wasnt so keen on doing but thought i should atlease get some information.
In regards to a single what do you think would be an the best option avaliable?
Obviously billet and ball bearing if the option is there.
Turbonetics, precision, garrett any others im missing?
106,114,122...F-trim, G-trim???
Price isnt an issue im just looking for the best of the best.
In Aus no one will give you an honest review about a turbo unless its garrett.
Thread Starter
Teching In
Joined: Sep 2010
Posts: 12
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From: Australia
To be honest i have no idea on the weight i would say around the 3300-3600lbs.
I live about 8-10 hours away from the closest 1/4 mile as the only one in my state is caught up in a legal battle going on close to 10yrs now. I am willing to travel when its finished so thas not an issue.
I would love to go into the 8's on a street setup and dip into the 7's in full race mode.
Obviously in not sure if this will be possible as there are so many variables. Not to mention ive never raced on a 1/4 mile so it will be a very slow process getting to those numbers.
I live about 8-10 hours away from the closest 1/4 mile as the only one in my state is caught up in a legal battle going on close to 10yrs now. I am willing to travel when its finished so thas not an issue.
I would love to go into the 8's on a street setup and dip into the 7's in full race mode.
Obviously in not sure if this will be possible as there are so many variables. Not to mention ive never raced on a 1/4 mile so it will be a very slow process getting to those numbers.
Check this out 1st.
http://www.youtube.com/watch?v=iPLSkzgPs80
http://www.youtube.com/watch?v=S3RHtA2jWq0
http://www.youtube.com/watch?v=iPLSkzgPs80
http://www.youtube.com/watch?v=S3RHtA2jWq0
If you plan on mostly street driving, looking for 2000hp, i'd consider twin PTE HP4788R turbochargers, BS3 with staged injection. Race fuel in australia heaps expensive. Staged injection make best use of race fuel.
Fraser
Fraser
Thread Starter
Teching In
Joined: Sep 2010
Posts: 12
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From: Australia
The main focus with the car for this next year is the show scene and the dyno contests you have to enter be judged overall.
Once the show season is over i will be trucking the car interstate to different race events or just for a weekend with other mates and their cars.
In a year it may see 500-1000km (300-600miles) of street use and 98% of that will be off boost.
I have no intentions of going out there and trying to run p.b after p.b but if i start out on say 800hp then 1000, 1200, 1500 and just progress as i get used to the car.
Im in no hurry to learn i will more than likely keep this car until i pass it onto my kid as it was my first car. God i cant afford a kid anytime soon. Its hard enough being 24 with the car, girlfriend, travel and normal day to day life i dont want/need debt.
The price of race fuel is alot but i have no choice so im happy paying $260 for 20L (5 gallons). When it needs to be driven on the street i will throw a different tune in it and run on 98 octane.
Once the show season is over i will be trucking the car interstate to different race events or just for a weekend with other mates and their cars.
In a year it may see 500-1000km (300-600miles) of street use and 98% of that will be off boost.
I have no intentions of going out there and trying to run p.b after p.b but if i start out on say 800hp then 1000, 1200, 1500 and just progress as i get used to the car.
Im in no hurry to learn i will more than likely keep this car until i pass it onto my kid as it was my first car. God i cant afford a kid anytime soon. Its hard enough being 24 with the car, girlfriend, travel and normal day to day life i dont want/need debt.
The price of race fuel is alot but i have no choice so im happy paying $260 for 20L (5 gallons). When it needs to be driven on the street i will throw a different tune in it and run on 98 octane.
Last edited by 427_LSX; Sep 12, 2010 at 08:10 AM.
Making enough power to run a 7 isn't all that difficult. Actually making a 7 sec pass at that weight is a different story all together. If you are building a dyno car and you have the budget, go all the way and get an aftermarket reinforced block, fill, o-ring and slap the 91's on there. Let us know how far you can push it.
