9 Second (STS) REAR mount setup
9 Second (STS) REAR mount setup Ok gents... I want to have a 9 Second STS. Please keep the flames to the minimum, if you dont think it cant be done... then just say that.
I would love to have the input of you educated folks on the subject. Please... nothing personal, but if you have never had a 10 second or faster car, state what you are basing your information upon.
What I am currently considering is:
Built 408: Would love to go this way, however there is a challenge in getting a large enough turbo to operate within its optimum efficiency range in a remote mount setup.... INPUT PLEASE!!
Second COA is a built 370 for the higher RPM capability to get a smaller turbo into its needed efficiency range... INPUT PLEASE!!!
I understand and have noted that the Dyno'd RWHP for an STS does not translate to the same performance as NA or a front mount (often referred to as Supra like performance). I am thinking I will need to see 800RWHP to see the solid 9's... INPUT PLEASE!!
Thanks guys!!
Jared
I would love to have the input of you educated folks on the subject. Please... nothing personal, but if you have never had a 10 second or faster car, state what you are basing your information upon.
What I am currently considering is:
Built 408: Would love to go this way, however there is a challenge in getting a large enough turbo to operate within its optimum efficiency range in a remote mount setup.... INPUT PLEASE!!
Second COA is a built 370 for the higher RPM capability to get a smaller turbo into its needed efficiency range... INPUT PLEASE!!!
I understand and have noted that the Dyno'd RWHP for an STS does not translate to the same performance as NA or a front mount (often referred to as Supra like performance). I am thinking I will need to see 800RWHP to see the solid 9's... INPUT PLEASE!!
Thanks guys!!
Jared
You dont need a 408 and i dont see you putting a minimum of a T88 back there either.I think you main concern would be being able to get your fuel and drivetrain in order to do that.....your tranny WILL have problems and need to be upgraded and you'll need a new clutch,youll need 60# injectors if not larger(id go larger), lines, rails, another pump, a fuel pressure regulator.Youll more than likely need more suspension also.Id do a 370 iron block since itd last longer at that power level and since the turbos in the rear itll balace better(ie it shouldnt be very front end heavy with the iron block since the turbo will help distribute the weight better), and then call up or pm Jose@ forced Inductions on a turbo choice since theyve come out with some new products that might make it worth your while.Its going to be a little more complicated than just drop in a motor and bigger turbo and run 9's.But to each his own.Good luck
ud prolly have to ditch the t56. again, i will say u dont need huge cubes...i would go with a 6l block and stock crank MAX. when i had my sts i worked with cartek, and they really know their ****. i would forget what people on here have to say, and get on the phone with dave. they are really good, and obviously have this setup down
Jared, how soon are you looking to do this? My progress has been almost snail paced (been busy at work), but I hope to get to the track sometime in the near future. You could base your decisions off the results that I have.
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Given that Kenny is now <10 sec in his GTO, it can be done. I agree that if your primary goal is 1/4 mi time, you would do better with a built automatic. Being able to load the converter at the line and INSTANTLY be in boost makes a huge difference. OTOH, getting my M6 STS-LS2 goat off the line was real tricky...spin, spin, spin down the track. And remember, we have IRS which doesn't help either.
For your interest: http://ls1gto.com/forums/showthread.php?t=49274
For your interest: http://ls1gto.com/forums/showthread.php?t=49274
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A built right 346ci and a T70 Turbo can put you in the 9's -with good gas at the track.Say 12-14lbs on the street (650-700rwhp) and 18lbs at the track (800+hp).You will need a good fuel system with 75lb injector's too.I really don't see a problem.
If you aren't stuck on 1 power adder, a 100 dry shot (and 75lbers) would get you spooled right away and 60 footin' good if you could get it to the ground. Use a boost referenced switch ( or boost controller output...don't you already have an eboost?) to shut the shot off at 4-5psi...
...just a thought.
...just a thought.
John... dont know.. I would like to but allot of people are telling me to go auto.
Frost... Thought about that too. Is there any reason why I shouldnt do that? What about competition? Are there limits to having two power adders?
Frost... Thought about that too. Is there any reason why I shouldnt do that? What about competition? Are there limits to having two power adders?
On a per-event basis, there will likely be... there are no limits in test and tune and most brackets, nor on the street 
-edit-
...although surely the haters will give you [more] **** about having 2 power adders.
-edit-
...although surely the haters will give you [more] **** about having 2 power adders.
On The Tree
Joined: Jun 2005
Posts: 119
Likes: 0
Originally Posted by Frost
On a per-event basis, there will likely be... there are no limits in test and tune and most brackets, nor on the street
-edit-
...although surely the haters will give you [more] **** about having 2 power adders.
-edit-
...although surely the haters will give you [more] **** about having 2 power adders.
TECH Regular
Joined: Feb 2003
Posts: 451
Likes: 0
From: Spring Hill, TN
You have a misconception that you can use a smaller turbo if you use the 370 ci option. You talked about using the shorter stroke to run higher revs which means that with both engines you are talking about the same amount of air being consumed.
Each one will need the same turbo.
Each one will need the same turbo.
Suspended Sponsor
Joined: Oct 2004
Posts: 371
Likes: 0
From: Just outside of Palm Springs Ca.
Guys,
Just thought you might like to see what we have been working on here at Race-Prep, I know the turbo is a little small for the app. but I am sure I can make at least 800RWHP with it and I have all the components to make it a well performing 1/4 mile terror! Check the link, I will be updating as we go along with the build!
-Bryan
http://www.race-prep.com/?p=31
Just thought you might like to see what we have been working on here at Race-Prep, I know the turbo is a little small for the app. but I am sure I can make at least 800RWHP with it and I have all the components to make it a well performing 1/4 mile terror! Check the link, I will be updating as we go along with the build!
-Bryan
http://www.race-prep.com/?p=31
Originally Posted by jyeager
You have a misconception that you can use a smaller turbo if you use the 370 ci option. You talked about using the shorter stroke to run higher revs which means that with both engines you are talking about the same amount of air being consumed.
Each one will need the same turbo.
Each one will need the same turbo.
TECH Regular
Joined: Feb 2003
Posts: 451
Likes: 0
From: Spring Hill, TN
Originally Posted by longrange4u
I disagree with you in part.. Talking to Jose and looking at the different turbo efficiency maps, I believe that a 370 at 6400rpms in a rear mount situation will consume a fair amount less air then a 408 at 5900. There is also significant loss in exhaust efficiency through the turbo due to the ~300Deg + loss of temp. Per Jose and others… a GT-42 76 would be ideal for the 370, however it would be loosing efficiency with the volume of exhaust flow of a 408.
If you size the turbos differently it's only because you want to get the proper driveability factors maximized. But this will result in less power output. You end up having to boost the smaller turbo to a higher pressure (if you want the same target output) and then you end up outside of the efficiency range which heats the intake charge more.
I'll be the first to tout the importance of driveability (quick spool, lower boost threshold) and for this reason I'd choose the higher displacement engine...less revs, more torque before boost.
But I'm a neophyte, I trust Jose's recommendation.