Thinking Low Boost Turbo
10-19-10, 01:23 PM
#16
Lexus Champion
Thread Starter
I would enjoy doing that. Need a research and development GS4xx in Houston for that to happen. Of course this following an assumed successful build on my LS400. Suffice to say that my project will be different than many will expect and will use a low mount turbo near the engine. In addition to working well at the target boost it can be added to in the future if a stronger transmission option becomes a reality and in that situation be capable of over 800hp.
10-20-10, 02:14 AM
#17
Question. Is there anyway to reduce the amount of PSI that the supercharger produces other than changing the size of the pulley? Perhaps through the tuning? Reason being is if someone had a newly acquired SC kit and it only came with say...a custom pulley that yielded 8psi and that individual only wanted a 6psi power level without having to incur additional costs to get a (larger) custom pulley fabricated.
http://www.928m.com/parts/boostlimitervalve.php
Didn't SRT use ATI Procharger units? check w/ Procharger for larger pulleys
10-20-10, 04:12 AM
#18
[Didn't SRT use ATI Procharger units? check w/ Procharger for larger pulleys[/quote]
Pending on how old this kit is... SRT made there own custom SC too.
JBrady keep us up to speed on your specs and progress.. I am looking to source that Y pipe for us too..Will a gs300 be the same as gs4xx?
Pending on how old this kit is... SRT made there own custom SC too.
JBrady keep us up to speed on your specs and progress.. I am looking to source that Y pipe for us too..Will a gs300 be the same as gs4xx?
10-20-10, 05:33 AM
#19
Thanks Gill...I'll look into it. For the record, this was mr johnson's old SRT Stage 3 SC kit.
I hope he doesn't mind me using the pic...this is what it would "hopefully" look like when I get it installed sometime Spring/Summer.
BUT with some engine bay bling. I'll either get all piping hi-polished or chromed and I'll probably also polish the manifold while I'm at it...
I hope he doesn't mind me using the pic...this is what it would "hopefully" look like when I get it installed sometime Spring/Summer.
BUT with some engine bay bling. I'll either get all piping hi-polished or chromed and I'll probably also polish the manifold while I'm at it...
Thanks again for all your help Mike!
10-20-10, 11:37 AM
#24
Well, I heard and read that the previous owner(s) were making around 420whp and around 360wtq where they didn't even have headers! I'd be happy with a very mild tune producing say...370-380whp while it is my daily driver. After that I would probably utilize the smaller custom pulley supplied and perhaps beef up the tranny a little. We'll see. All I know is it is going to be SICK!
Pulling up some old threads by mr johnson he mentioned that his 0-60 was around 4.5 seconds and that was WITH letting off the gas to allow the tranny to shift (all that power would just make it bounce off the rev limiter). He mentioned on highway pulls not much would hang with it.
Pulling up some old threads by mr johnson he mentioned that his 0-60 was around 4.5 seconds and that was WITH letting off the gas to allow the tranny to shift (all that power would just make it bounce off the rev limiter). He mentioned on highway pulls not much would hang with it.
10-20-10, 05:48 PM
#25
I like the idea of keeping the S&S headers and the low-mount turbo, and the budget setup. Very interested in following this...
I don't want to derail the thread any more than it already has, but wouldn't our limited psi goals make the supercharger's full-range power delivery more useful? Otherwise we'd run 6 psi from 3k RPMs to 6k RPMs, right? I'm thinking even less opportunity for acceleration at 6psi -- we'd need all the TIME we could get at that psi since the psi itself is a constant and limiting factor...?
(I have no idea what I'm talking about -- just throwing a thought out there.)
Jbrady, so what are your plans? Do you have a rough idea you could offer up? Bill of materials? Can you scan in a sketch?
The blow-off valve sound from a GS would be priceless!!
I don't want to derail the thread any more than it already has, but wouldn't our limited psi goals make the supercharger's full-range power delivery more useful? Otherwise we'd run 6 psi from 3k RPMs to 6k RPMs, right? I'm thinking even less opportunity for acceleration at 6psi -- we'd need all the TIME we could get at that psi since the psi itself is a constant and limiting factor...?
(I have no idea what I'm talking about -- just throwing a thought out there.)
Jbrady, so what are your plans? Do you have a rough idea you could offer up? Bill of materials? Can you scan in a sketch?
The blow-off valve sound from a GS would be priceless!!
Last edited by Frankdorn; 10-21-10 at 11:18 AM.
10-21-10, 10:36 AM
#27
Lexus Champion
Thread Starter
Jbrady, so what are your plans? Do you have a rough idea you could offer up? Bill of materials? Can you scan in a sketch?
I like the idea of keeping the S&S headers and the low-mount turbo, and the budget setup. Very interested in following this...
I don't want to derail the thread any more than it already has, but wouldn't our limited psi goals make the supercharger's full-range power delivery more useful? Otherwise we'd run 6 psi from 3k RPMs to 6k RPMs, right? I'm thinking even less opportunity for acceleration at 6psi -- we'd need all the TIME we could get at that psi since the psi itself is a constant and limiting factor...?
(I have no idea what I'm talking about -- just throwing a thought out there.)
Jbrady, so what are your plans? Do you have a rough idea you could offer up? Bill of materials? Can you scan in a sketch?
The blow-off valve sound from a GS would be priceless!!
I like the idea of keeping the S&S headers and the low-mount turbo, and the budget setup. Very interested in following this...
I don't want to derail the thread any more than it already has, but wouldn't our limited psi goals make the supercharger's full-range power delivery more useful? Otherwise we'd run 6 psi from 3k RPMs to 6k RPMs, right? I'm thinking even less opportunity for acceleration at 6psi -- we'd need all the TIME we could get at that psi since the psi itself is a constant and limiting factor...?
(I have no idea what I'm talking about -- just throwing a thought out there.)
Jbrady, so what are your plans? Do you have a rough idea you could offer up? Bill of materials? Can you scan in a sketch?
The blow-off valve sound from a GS would be priceless!!
Not all superchargers are the same.
Some make the same boost (or very similar boost) from off idle to redline. This type is known as a positive displacement supercharger.
The Eatons and Whipples are positive displacement.
Others make boost progressively and start making boost at 2500rpm or so but do not reach peak boost until redline. This type is known as a centrifugal supercharger.
The ATI's and Paxton's and the above pictured SRT is of this type.
Turbos can be sized to make boost from very low RPM and that is a typical street design. For maximum power racing designs turbos are sized for peak power flow such as mega HP Supras. My target is street with quick boost response in the 2000rpm range with peak boost by 3000rpm and lasting til redline. This should make the engine FEEL like it is 5.5 liters making 400ft/lbs and 400hp.
This is all in my "cranial design studio" but is based on solid knowledge.
10-21-10, 11:20 AM
#28
so essentially your doing a remote mount setup right?
i have been very interested in this type of setup for awhile as its more efficient for the v8 IMHO...
we actually discussed it a long time ago and i think someone emailed STS and they informed us of the universal kit they have...
i can dig the link up in a sec
Edit: FOUND A FEW
https://www.clublexus.com/forums/per...d-of-this.html
https://www.clublexus.com/forums/per...not-gs300.html
https://www.clublexus.com/forums/per...bo-set-up.html
and OMFG this one is ancient
https://www.clublexus.com/forums/per...ting-400s.html
i have been very interested in this type of setup for awhile as its more efficient for the v8 IMHO...
we actually discussed it a long time ago and i think someone emailed STS and they informed us of the universal kit they have...
i can dig the link up in a sec
Edit: FOUND A FEW
https://www.clublexus.com/forums/per...d-of-this.html
https://www.clublexus.com/forums/per...not-gs300.html
https://www.clublexus.com/forums/per...bo-set-up.html
and OMFG this one is ancient
https://www.clublexus.com/forums/per...ting-400s.html
Last edited by sakataj; 10-21-10 at 11:30 AM.
10-21-10, 01:19 PM
#29
Lexus Champion
Thread Starter