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08-31-2019, 03:03 PM | #1 |
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Gt35r ej207 tuning HELP
Hi guys. Need ur input on this. Just got my 2013 JDM spec C, it has a full setup to support the gt35r, but internals are stock. Car was tuned for safety. The tuner kept tourque at 352, and hp at 456. He explained to me he tuned it with low torque to keep the rods safe, therefore he played with the boost graph, meaning that he gets 20psi by 4800rpm, and slowly increasing boost to 26psi at 7500rpm, redline 8300( car has meth injection). Ha claims this is the safest way to tune it. I'm hearing different opinions on this. Would it be better have higher boost earlier and taper it down to the redline? Thanks for ur input.....
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08-31-2019, 06:00 PM | #2 |
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Not if you want that motor to last any amount of time. He's keeping you from breaking a rod!
The way he tuned it is to keep cylinder pressures low (as low as possible with a 35r and 26psi) which will makes your rods much happier. He is doing it right and keeping your stock bottom end together but with that much power it won't last for long no matter how it's tuned! Good luck it sounds fun! |
08-31-2019, 07:39 PM | #3 |
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how does your car feel? a gt35 is going to spool super slow on a 2.0 liter anyways. so yeah if you don't like the tune get someone else to do it. what I know about the ej207, is it doesnt like alot of torque down low anyways. you could probably do more boost but you run the risk of lifting the heads after like after 28ish on stock head studs. so choose yoru poison. if you want to keep your engine running, dont go super crazy and try to push it to see what it will do.
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08-31-2019, 11:31 PM | #4 |
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The ej207 specC( the one I have) supposed to have different cams and stuff, actually it's not very laggy. By 4000rpm boost starts build and fast, B4 5000 fullboost in 3rd gear, then full power to 8000rpm. It's very nice.
About the tune, as I want it to last as long as possible, I'm going to lower the boost to 24psi, and keep it same way with lower boost at lower rpm and make it increase to redline. |
08-31-2019, 11:43 PM | #5 |
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Your tune doesn't sound right to me and the EJ207 rods doesn't have a strength issue below 500whp/wtq. Have your tuner redo the tune and make sure there isn't any knock anywhere in the RPM band.
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09-01-2019, 02:02 AM | #6 | |
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Can anyone explain the properties , weaknesses and strength of this engine compare to other similar version? I appreciate the help, don't really have time to spend hours searching the net. About the tune it's very safe, no knock whatsoever. |
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09-01-2019, 12:46 PM | #7 | ||
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09-02-2019, 09:47 AM | #8 |
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what gen GT35r are you using and what fuel?
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09-02-2019, 11:44 AM | #9 |
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09-02-2019, 12:55 PM | #10 |
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judging by the numbers (and meth) in the first post I'm guessing pump gas ?
2013 v10 sti ej207 should have very thick cyl walls , weak link would be pistons , then rods sounds like his tuner is not a brotuner idiot |
09-02-2019, 06:37 PM | #11 |
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gt not gtx remember.. true ti doees have thick walls, but the 2-7 dont really make alot of power down low anyways
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09-02-2019, 11:15 PM | #12 |
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So, am I safe to keep boost the way it is? As now it spools fast at 21psi by 5000rpm, then slowly increase to 26psi at 7800. Should I lower the top boost to 23 or 24?
Yes. Pump 91 plus meth |
09-03-2019, 07:54 PM | #13 |
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09-03-2019, 07:55 PM | #14 |
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09-03-2019, 09:54 PM | #15 |
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wow sorry for the spelling errors dang but if you cant figure it out here we go again he said it was a gt not a gtx so the spool will be slow. the 207 does have thick walls but it still a 2.0 and will spool that turbo super slow anyways....better??
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09-04-2019, 12:10 AM | #16 | |
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But back to the topic, am I playing with fire here? Should I lower boost to 21psi to be safer? What u think of the way he tuned it, 20psi at full spool slowly increasing to 26psi to redline? |
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09-04-2019, 09:37 AM | #17 |
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really depends on what version of the 35r you are using
it could flow from 54 to 87 lbs/min that makes a difference because 20lbs of boost on one turbo is not the same as 20lbs on another it's more about the air mass being moved part number ? it's usually the lower set of numbers on the tag on the center section on a garrett |
09-04-2019, 11:49 AM | #18 | |
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706451-5008 Ljm026920 |
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09-05-2019, 05:04 PM | #19 | |
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Also, the EJ207 doesn't have rod issues where you need to limit torque. The proper tune would be to give it as much boost as it'll take as early as possible without knock and then taper off when it's no longer making power at that boost/rpm level. Last edited by Fierysun; 09-05-2019 at 05:11 PM. |
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09-05-2019, 11:32 PM | #20 | |
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So this is his reasoning. It also news to me, but thinking about it it makes sense, I'm just getting confused. That's why I created this thread, love to hear different inputs. |
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09-06-2019, 11:10 AM | #21 | |
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09-08-2019, 04:28 PM | #22 | |
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09-08-2019, 10:54 PM | #23 | |
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09-09-2019, 02:26 PM | #24 | |
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09-09-2019, 05:02 PM | #25 |
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https://www.garrettmotion.com/racing...turbo/gt3582r/
look at the compressor map for yourself. compare boost vs airflow. Tapering boost controls the speed of the compressor wheel. Tapering becomes necessary when the compressor is at its limits. However, consider the vertical line at 55lbs/min, if youre starting at like 20 psi and 30lbs/min at and run out to 55lbs then tapering and maintaining a constant compressor speed will push the turbo into a region that is less efficient than if it climbed up to about 26psi and 55lbs instead. Efficiency is heat, so at 76% efficiency the air coming out of the turbo is cooler than at 66% efficiency. |
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