Aristo 2JZ-GTE VVTi Swap Doc - Page 4 - Lexus IS Forum
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post #46 of 795 (permalink) Old 01-17-2008, 09:56 AM
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All GTE injectors are side feed. You can swap to the USDM injectors if you like. Nothing wrong with the Aristo FPR. It just works with OEM reliability. How much hp are you shooting for?

Car sold to a good new home!

Full Aristo 2JZ-GTE BPU++ - Getrag v161 - EMU - Brembo BBK - CCW Classics 9F/10.5R - 255/35F - 285/30R - AAR Arms - GReddy Type-S - Hotchkis Sways - Teck Kit - Prolex / Cusco STB - Full ICE - HKS Drager - Prosport Prem Boost/EGT/FP - Innovative LC-1/XD-16 - Goodridge SS - TRD F/R Underbrace - Greddy Profec B Spec II - Megan Toe Arms
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post #47 of 795 (permalink) Old 01-17-2008, 11:09 AM
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Without this crap physically in front of me I'm just shooting off what I've 'read' from different sources. Regardless, I'll be going with a 700ish cc injector and whatever rail is best suiting. An Aeromotive FPR for $150 probably isnt a bad investment either. As it stands, the stock twins will be replaced for ease of fitment (and knowing full well that going single will only be a matter of time for me).

Keep up the good work!
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post #48 of 795 (permalink) Old 01-17-2008, 11:26 AM
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You can convert to a top feed rail and have access to cheaper top feed injectors.

Car sold to a good new home!

Full Aristo 2JZ-GTE BPU++ - Getrag v161 - EMU - Brembo BBK - CCW Classics 9F/10.5R - 255/35F - 285/30R - AAR Arms - GReddy Type-S - Hotchkis Sways - Teck Kit - Prolex / Cusco STB - Full ICE - HKS Drager - Prosport Prem Boost/EGT/FP - Innovative LC-1/XD-16 - Goodridge SS - TRD F/R Underbrace - Greddy Profec B Spec II - Megan Toe Arms
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post #49 of 795 (permalink) Old 01-18-2008, 09:32 AM
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Teck,

If I keep the aristo fuel rail and injectors, is there a plug for a fuel return line? or do I have to tap the rail?

If I go usdm fuel rail and injectors, is there also a plug for a fuel return? or like the other do I have to tap it?

Cause I was thinking about gettin a custom rail made by another member on here.

o2' Black Onyx IS300 - Back to stock :( for now.
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post #50 of 795 (permalink) Old 01-18-2008, 10:25 AM
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You've said your hp goal is 400 in another thread...y all the effort to swap out something that works?

The Aristo already is setup to use a return system.

Car sold to a good new home!

Full Aristo 2JZ-GTE BPU++ - Getrag v161 - EMU - Brembo BBK - CCW Classics 9F/10.5R - 255/35F - 285/30R - AAR Arms - GReddy Type-S - Hotchkis Sways - Teck Kit - Prolex / Cusco STB - Full ICE - HKS Drager - Prosport Prem Boost/EGT/FP - Innovative LC-1/XD-16 - Goodridge SS - TRD F/R Underbrace - Greddy Profec B Spec II - Megan Toe Arms
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post #51 of 795 (permalink) Old 01-18-2008, 10:28 AM Thread Starter
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how much better can a fuel return system be? what would the benefits be with an aftermarket system? It's just sending fuel back...right.

01 MSM E-Shift ZGMF-X10A Freedom
- Full OEM Aristo 2JZ-GTE conversion :)

Looking to do an Aristo swap?
Aristo Swap with IS ECU
Aristo Swap with Aristo ECU
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post #52 of 795 (permalink) Old 01-18-2008, 10:41 AM
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Originally Posted by TeCKis300 View Post
You've said your hp goal is 400 in another thread...y all the effort to swap out something that works?

The Aristo already is setup to use a return system.
Thats me being retarded about it. I didnt know that it was already set up and that all I had to do was run the line. I have not had a chance to look at my motor for too long.

o2' Black Onyx IS300 - Back to stock :( for now.
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post #53 of 795 (permalink) Old 01-18-2008, 10:58 AM
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Quote:
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how much better can a fuel return system be? what would the benefits be with an aftermarket system? It's just sending fuel back...right.
Teck, correct me if I'm wrong, but how much of a difference did you have to tune around going from a 40psi constant fuel pressure to a variable fuel pressure dependent on vacuum?

Hypothetically speaking I would think the injector pulse width time for one tune on the same engine but with 40psi constant fuel pressure would be slightly different than an ECU for the same engine that uses an FPR that uses a vacuum reference. IMO it would be simpler to tune from scratch (injector pulse width wise) with a car that has the vacuum FPR setup than a constant fuel pressure setup (were you would have to tune around 40psi at the injector squirting out more or less fuel dependent on what pressure is in the cylinder). So IMO the FPR does some of the tuning for you, but if using an OE ECU already tuned for 40psi constant, there must have been some tuning all around the spectrum to work with the variable of now introducing an FPR to the system. (and this would be why the TE S1 kits would need a one way valve so that their FPR could not see vacuum, but only boost).

If all this is true, I would have thought tuning with a piggy around the OE ECUs maps would have been tricky at the least with an FPR system. Was this a task you had to do or was it hardly a problem, did you install a one way valve or do I have it all wrong completely?

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post #54 of 795 (permalink) Old 01-18-2008, 11:04 AM
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Quote:
Originally Posted by wingzero View Post
how much better can a fuel return system be? what would the benefits be with an aftermarket system? It's just sending fuel back...right.
You will run out of injector without a FP riser in the loop.

Car sold to a good new home!

Full Aristo 2JZ-GTE BPU++ - Getrag v161 - EMU - Brembo BBK - CCW Classics 9F/10.5R - 255/35F - 285/30R - AAR Arms - GReddy Type-S - Hotchkis Sways - Teck Kit - Prolex / Cusco STB - Full ICE - HKS Drager - Prosport Prem Boost/EGT/FP - Innovative LC-1/XD-16 - Goodridge SS - TRD F/R Underbrace - Greddy Profec B Spec II - Megan Toe Arms
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post #55 of 795 (permalink) Old 01-18-2008, 11:08 AM
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Originally Posted by BlackSportD View Post
Teck, correct me if I'm wrong, but how much of a difference did you have to tune around going from a 40psi constant fuel pressure to a variable fuel pressure dependent on vacuum?

Hypothetically speaking I would think the injector pulse width time for one tune on the same engine but with 40psi constant fuel pressure would be slightly different than an ECU for the same engine that uses an FPR that uses a vacuum reference. IMO it would be simpler to tune from scratch (injector pulse width wise) with a car that has the vacuum FPR setup than a constant fuel pressure setup (were you would have to tune around 40psi at the injector squirting out more or less fuel dependent on what pressure is in the cylinder). So IMO the FPR does some of the tuning for you, but if using an OE ECU already tuned for 40psi constant, there must have been some tuning all around the spectrum to work with the variable of now introducing an FPR to the system. (and this would be why the TE S1 kits would need a one way valve so that their FPR could not see vacuum, but only boost).

If all this is true, I would have thought tuning with a piggy around the OE ECUs maps would have been tricky at the least with an FPR system. Was this a task you had to do or was it hardly a problem, did you install a one way valve or do I have it all wrong completely?
Excellent observation and this is one of the tuning nuances that most people don't even get into, let alone understand.

I will leave it at this - absolutely true and yes, this makes things tricky.

Car sold to a good new home!

Full Aristo 2JZ-GTE BPU++ - Getrag v161 - EMU - Brembo BBK - CCW Classics 9F/10.5R - 255/35F - 285/30R - AAR Arms - GReddy Type-S - Hotchkis Sways - Teck Kit - Prolex / Cusco STB - Full ICE - HKS Drager - Prosport Prem Boost/EGT/FP - Innovative LC-1/XD-16 - Goodridge SS - TRD F/R Underbrace - Greddy Profec B Spec II - Megan Toe Arms
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post #56 of 795 (permalink) Old 01-18-2008, 11:30 AM
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Glad I'm not off base with this.

I'm afraid that this 40psi constant is going to make tuning my MS tricky.

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post #57 of 795 (permalink) Old 01-18-2008, 12:54 PM
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Just goes back to the question someone asked - why use the stock FPR which has constraints or limitations... RR FPR FTW
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post #58 of 795 (permalink) Old 01-18-2008, 01:13 PM
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So tell me...what are those supposed "constraints or limitations?"

Car sold to a good new home!

Full Aristo 2JZ-GTE BPU++ - Getrag v161 - EMU - Brembo BBK - CCW Classics 9F/10.5R - 255/35F - 285/30R - AAR Arms - GReddy Type-S - Hotchkis Sways - Teck Kit - Prolex / Cusco STB - Full ICE - HKS Drager - Prosport Prem Boost/EGT/FP - Innovative LC-1/XD-16 - Goodridge SS - TRD F/R Underbrace - Greddy Profec B Spec II - Megan Toe Arms
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post #59 of 795 (permalink) Old 01-18-2008, 01:25 PM
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Originally Posted by TeCKis300 View Post
So tell me...what are those supposed "constraints or limitations?"
^TBD, I dont know. Key word is supposed-What exactly are the flow rates or properties around the Toyota FPR? Where does it crap out with larger injectors pushing an excess of fuel off to be sent back to the tank? A 40psi constant flow rate vs variable vacuum controlled or rising rate is significantly different when it comes to tuning. All I'm saying is for $150 I probably care not to even know...I'll be opting for a rising rate fpr that I know I can tune satisfactory with an E6x.
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post #60 of 795 (permalink) Old 01-18-2008, 01:28 PM
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Not sure if u'r talking about the IS static regulator or the Aristo rising rate regulator.

The Aristo, like all GTE's, already has a vacuum/boost reference rising rate fuel pressure regulator. No point spending money on something that is already there and plenty capable.

Car sold to a good new home!

Full Aristo 2JZ-GTE BPU++ - Getrag v161 - EMU - Brembo BBK - CCW Classics 9F/10.5R - 255/35F - 285/30R - AAR Arms - GReddy Type-S - Hotchkis Sways - Teck Kit - Prolex / Cusco STB - Full ICE - HKS Drager - Prosport Prem Boost/EGT/FP - Innovative LC-1/XD-16 - Goodridge SS - TRD F/R Underbrace - Greddy Profec B Spec II - Megan Toe Arms
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