JDM 2JZ-GTE A/F at boost levels greater than 14psi - Page 4 - Club Lexus Forums


JDM 2JZ-GTE A/F at boost levels greater than 14psi

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Old 12-11-11, 08:39 PM   #46
97-SC300
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Thanks for the help guys. Do you have any pointers on the actual tuning portion? I've never done this.
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Old 12-12-11, 04:28 AM   #47
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Quote:
Originally Posted by SC51 View Post
That seems to be the boost point where most guys run out fuel around. I dunno I still havn't experienced and WOT A/F numbers going above 11.1 and thats at 20psi. I still want to do the new map sensor and 550's and update, Ive just been busy getting the quad ready for motocross.
I have a feeling that your rich fuel curve has a lot to do with your afpr cranking base fp. I may do that to my car before I go 550s, just to squeeze a little more out of it.
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Old 12-12-11, 06:51 AM   #48
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Would i have to adjust the hi/low throttle settings and take away 10-20% fuel there? Also would i still need to keep my bcc or get rid of it
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Old 12-12-11, 10:03 AM   #49
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yes, you set the high and low to the same number for taking out fuel when adjusting just for injector change.
you will hit boost cut at a slightly higher psi now, if that is above your max boost, than you may not need the boost cut controller anymore.
maybe it will move up by a few psi.
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Old 12-12-11, 10:45 AM   #50
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should i do taht in all rmp ranges? or only at 1000?
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Old 12-12-11, 10:55 AM   #51
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Here you go. The specs are as follows:

JDM GTE, JDM turbos and cams, d/p
440cc injectors, walbro, stock rail/regulator/filter
AEM EMS Series 2
STOCK SC300 EXHAUST!!!!!
91 octane ****]
14.5psi
380whp/400 ft/lbs
74% IDC



Ian
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Old 12-12-11, 12:19 PM   #52
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^^^^Dang, that is impressive. I want to put mine on the dyno once I get this new o2 and install my FMIC.
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Old 10-30-13, 04:54 PM   #53
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Any new updates on this.....has it been decided that on Stock Aristo ECU what is max psi you can run the stock twins vs. a single turbo. i.e when does boost and fuel cut come in?
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Old 11-02-13, 07:32 PM   #54
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At sea level boost cut is 14-15 psi. Boost cut is fuel cut. Doesn't matter single or twins on Jdm aristo or supra Ecu it happens at a certain map sensor voltage. If you are higher elevation like colorado, the boost cut is around 17-18 psi, because with the engine off at this altitude the map sensor reads about -2psi. So to hit the voltage for boost cut it takes that much more boost. Balances things out cause you loose power at altitude so it's great to be able to run a few more psi without getting a bcc. There is also a speed cut in Jdm ecu's around 110-115mph. Usdm Ecu is more like 150mph or something like that.
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Old 11-02-13, 09:57 PM   #55
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Thanks Ali.

I was just curious to see what the differences are for Aristo 2jzgte vs. USDM.
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Old 11-04-13, 08:14 AM   #56
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Quote:
Originally Posted by CatManD3W View Post
Thanks Ali.

I was just curious to see what the differences are for Aristo 2jzgte vs. USDM.
boost cut is the same pretty much on both ecu's. the usdm has a map sensor for boost cut and here in denver I have seen a bpu gte motor on a usdm ecu hit boost but at the exact same ~17-18 psi that my aristo ecu does. that when I looked into the whole elevation thing because we should be hitting it at 14-15 psi range, but both of us hit it at the higher 17-18 psi very consistently, and its because the map sensors read absolute pressure and put out a voltage, and boost cut is just at a certain voltage or absolute psi, and here that absoulte psi is 17 more than the air you are breathing. at sea level that absolute psi is 14 more than the air you are breathing.

also the reason its set up like that is so you can drive through all kinds of elevations on the stock ecu and never need a retune.
when I brought my car here on the aem, it hardly ran enough to get it off the trailer because of the change in elevation from sea level to a mile high.
the gte ecu though has no problem with elevation it just fires up and drives like normal whatever elevation you are at, remember Japan has lots of elevation changes so they already design the ecu's with these things in mind as they would normally require a re-tune on a standalone ecu.

Last edited by Ali SC3; 11-04-13 at 08:17 AM.
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Old 05-24-14, 09:04 AM   #57
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So with 550's injectors and a 2.5 BAR map sensor what is a safe amount of boost to run on stock ECU....

I am currently running 12psi off of wastegate with 440's and Aristo ECU...My air fuel at idle is between 14.6-15.2........on WOT it dips to 12.6-13.0

Last edited by CatManD3W; 05-24-14 at 02:00 PM.
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Old 05-24-14, 12:12 PM   #58
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Sweeeeet bump. What 2.5bar map are you run in because Toyota ecus generally only like the map sensor that came with it. Also, what turbo(s) is also a factor.
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Old 06-17-14, 04:42 PM   #59
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Bump.....Can I safely up my boost to 14psi on 440's and Aristo ECU......

I am currently running off the wastegate at 12psi..
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Old 06-18-14, 10:44 AM   #60
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see what your AFR is, and if you are in the 10-11 AFR you have more room, so bump it up a psi or 2 at a time. if you get into mid 12's AFR then stop there and maybe back off a little bit. I have run 17 psi with the 440's and aristo ecu showing a solid 10.5 or so that is in colorado and I have aftermarket 440's (not sure if that makes a difference) but at your elevation my 17 psi is like your 15 psi, and your turbo might flow more per psi than mine. everyone's turbo is different though so maybe you can't run as much, the AFR is the only way to know.

remember the stock fuel pressure regulator is a 1:1 rising rate with boost so you are good for a little higher than you think as the fuel pressure increases with boost also, and the more fuel pressure the more the injectors put out but it will only work till a certain amount. 550's might be the better way to go in the future though but you should be able to boost more than 12 safely.
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