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Old 04-09-2013, 07:19 AM   #6276
mrxr250rider
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I have an lgt geared 5spd and it runs a bit better due to the even gear spacing
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Old 04-09-2013, 12:05 PM   #6277
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If boost is holding, there's value in holding out to 7500 or so. Peak is usually around 7k-ish. On a vf, yeah, boost is tapering and HP peak is earlier.

If you've never driven a short ratio 2.0L you should try it. It's completely different than a 3.9 5speed. Either the short ratio 6 speed or a lower final 5 speed completely changes the character of the vehicle. It's a pretty huge difference. I never would have guessed or realized the difference until I actually drove a 4.444 final 5 speed.
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Old 04-09-2013, 08:34 PM   #6278
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Has anyone considered the precision 6266 in a .63 5bolt T3 option for the v8 ej207 as a stock internal block? Looking to do a small rebuild and was looking for some input on this type of a set up. Thanks everyone!

Edit: I have the 6mt close ratio trans as well.

Last edited by JDM_Thompson914; 04-09-2013 at 08:40 PM.
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Old 04-09-2013, 08:54 PM   #6279
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Quote:
Originally Posted by Concillian View Post
If boost is holding, there's value in holding out to 7500 or so. Peak is usually around 7k-ish. On a vf, yeah, boost is tapering and HP peak is earlier.

If you've never driven a short ratio 2.0L you should try it. It's completely different than a 3.9 5speed. Either the short ratio 6 speed or a lower final 5 speed completely changes the character of the vehicle. It's a pretty huge difference. I never would have guessed or realized the difference until I actually drove a 4.444 final 5 speed.
I bet your right. Prob runs a lot better with shorter gearing. The motor does like to rev. Shorter gearing 5spd +big turbo
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Old 04-09-2013, 09:19 PM   #6280
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Quote:
Originally Posted by Concillian View Post
If boost is holding, there's value in holding out to 7500 or so. Peak is usually around 7k-ish. On a vf, yeah, boost is tapering and HP peak is earlier.

If you've never driven a short ratio 2.0L you should try it. It's completely different than a 3.9 5speed. Either the short ratio 6 speed or a lower final 5 speed completely changes the character of the vehicle. It's a pretty huge difference. I never would have guessed or realized the difference until I actually drove a 4.444 final 5 speed.
This is so true. Heck, even the 4.11 in my 2.5RS is really fun or the 4.11 in the LGT. I rely think people overlook the 5mts with the fun ratios. They forget that the 4.11 or 4.44 boxes are much easier on gears than the 3.90 or the 3.70 found in the WRX's. The 4.11 5mts hold up to tough driving works better. It's actually a huge reason why the LGT gear set got the stronger reputation it has, but in reality it's the LGT final drive that saves the box.

I've heard rumors of 4.44 6mts for rally use but never got proof.

EDIT: Well I'll be damned, RalliSpec sells the GroupN 4.44 hearing for the 6MT...
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Old 04-10-2013, 11:17 AM   #6281
96SubyImpreza
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Wiring this avcs is probably the least fun part of this swap... Decided to make my own harness to save $200, so far totally worth it regardless of the extra time. I do wish I had the IA instructions though. Using the DS1 instructions.
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Old 04-10-2013, 03:36 PM   #6282
JulianDelphiki
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V8 vf37 owners. Im in the process of getting etuned and I dont get full boost until 4k. At 4k it comes on great(22psi making 300ft/lbs) but its extremely laggy up until that point. Its not a tune issue(took hose off the wg and it still lagged), and I checked for pre turbo exhaust leaks(seafoam) and there was none, and tightened the crap out of the two silcone couplers post turbo. Mods are catless tbe, grimmspeed ebcs, inlet, short ram.
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Old 04-10-2013, 04:23 PM   #6283
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Also, my avcs is working. Logged nps and vvt.
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Old 04-10-2013, 04:37 PM   #6284
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Quote:
Originally Posted by JulianDelphiki View Post
V8 vf37 owners. Im in the process of getting etuned and I dont get full boost until 4k. At 4k it comes on great(22psi making 300ft/lbs) but its extremely laggy up until that point. Its not a tune issue(took hose off the wg and it still lagged), and I checked for pre turbo exhaust leaks(seafoam) and there was none, and tightened the crap out of the two silcone couplers post turbo. Mods are catless tbe, grimmspeed ebcs, inlet, short ram.
Check for pre-turbo leaks as that will hurt spool.

I assume you are starting 3rd gear from 2,000 rpms or so for your logging? That's about where I see full boost on my wife's car but got a restrictive catted DP on it currently so I've assumed that's the issue with hers.

I was seeing full spool by 3300-3400 in 3rd on the v8 w/ VF37 that I tuned so I assume this should be closer to what you would see. This same car now fully spools a Dom 1.5 XTR TS by 3800 rpms in 3rd.
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Old 04-10-2013, 05:27 PM   #6285
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Quote:
Originally Posted by WRXt4cy View Post

Check for pre-turbo leaks as that will hurt spool.

I assume you are starting 3rd gear from 2,000 rpms or so for your logging? That's about where I see full boost on my wife's car but got a restrictive catted DP on it currently so I've assumed that's the issue with hers.

I was seeing full spool by 3300-3400 in 3rd on the v8 w/ VF37 that I tuned so I assume this should be closer to what you would see. This same car now fully spools a Dom 1.5 XTR TS by 3800 rpms in 3rd.
Yep logging from 2k up. I took the header off and it's heat shield to check it for leaks there. Changed the gaskets, I guess the up pipe could be leaking or cracked but won't I notice that kind of leak?
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Old 04-10-2013, 05:34 PM   #6286
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Quote:
Originally Posted by JulianDelphiki View Post
Yep logging from 2k up. I took the header off and it's heat shield to check it for leaks there. Changed the gaskets, I guess the up pipe could be leaking or cracked but won't I notice that kind of leak?
You can often hear up-pipe leaks but if you don't find anything else that could be causing it, it might be worth changing your up-pipe to turbo gasket.

Are you using the v8 oem bypass valve? I found the one in my wife's car to have a very soft spring. I replaced it with the factory one from my 2011 that I had removed and that helped the spool a bit. A 3 port boost controller helped a little more and got it down from 4300 to 4000 with these two things. I'm hoping the catted the DP is the last piece of the puzzle but if I still can't get 3300-3400 rpm spool, I'll be looking at changing out the pre-turbo gaskets myself.
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Old 04-10-2013, 05:40 PM   #6287
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Quote:
Originally Posted by WRXt4cy View Post

You can often hear up-pipe leaks but if you don't find anything else that could be causing it, it might be worth changing your up-pipe to turbo gasket.

Are you using the v8 oem bypass valve? I found the one in my wife's car to have a very soft spring. I replaced it with the factory one from my 2011 that I had removed and that helped the spool a bit. A 3 port boost controller helped a little more and got it down from 4300 to 4000 with these two things. I'm hoping the catted the DP is the last piece of the puzzle but if I still can't get 3300-3400 rpm spool, I'll be looking at changing out the pre-turbo gaskets myself.
I noticed the same thing(soft jdm bpv spring) so I changed to a sti bpv I had laying around. You said your wife's car is boosting at 4k. Hmm. I do have a catless dp but it is made from the oem bellmouth and a 3in hks dp.
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Old 04-10-2013, 05:45 PM   #6288
JulianDelphiki
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Also what should I look for in the logs if I'm looking for a pre turbo leak?
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Old 04-10-2013, 05:50 PM   #6289
WRXt4cy
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Quote:
Originally Posted by JulianDelphiki View Post
I noticed the same thing(soft jdm bpv spring) so I changed to a sti bpv I had laying around. You said your wife's car is boosting at 4k. Hmm. I do have a catless dp but it is made from the oem bellmouth and a 3in hks dp.
The downpipe on hers it homemade using a TS flange. It has very small mouth and tapers down quickly right into a welded in 14" cat.

Looking at my latest logs from her car, I was seeing 23 psi at 3900 rpms in 3rd and about 3500 rpms in 4th. It has the JDM 6 MT. The car I referenced earlier was running an 02 5 MT so the gearing does it up quicker as people were discussing in this thread a page or two back. I think that has some effect but other people have reported better spool than I'm seeing on her car. This 5 MT car just lost 3rd gear so he's moving to a 6 MT. Its going to be interesting to see how that affects when the turbo hits full boost.

What tranny are you running?

Quote:
Originally Posted by JulianDelphiki View Post
Also what should I look for in the logs if I'm looking for a pre turbo leak?
You're looking mostly just for slow spool. There won't be too much else to see. You might notice a lean reading on your wideband at idle and very low loads where fresh air is being pulled into the exhaust stream. At medium loads it turns into an exhaust leak and the fact that it can't build pressure as quickly with the leak is what causes the slow spool.
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Old 04-10-2013, 05:52 PM   #6290
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I'm running a wrx 5spd.
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Old 04-10-2013, 05:58 PM   #6291
WRXt4cy
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Quote:
Originally Posted by JulianDelphiki View Post
I'm running a wrx 5spd.
Ok, then assuming the person tuning your car knows what they are doing and its not as issue like too little timing during spool, too rich during spool or improper boost control, you should be able to hit boost much sooner.

You'll just have to figure out if you have a leak or a restriction of some sort and get it fixed.
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Old 04-10-2013, 06:00 PM   #6292
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ill make it easy for you. get a three port ebcs and mbc. run in parallel. set initial wgdc to 60 and max to 100. i spool by 3k rpms. do a boost leak test before u tune your car. if avcs is working and your tune is correct then its mechanical.
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Old 04-10-2013, 06:02 PM   #6293
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I assuming it's mechanical considering phatbotti is tuning it as we speak.
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Old 04-10-2013, 06:12 PM   #6294
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Quote:
Originally Posted by WhiteBgeye02 View Post
ill make it easy for you. get a three port ebcs and mbc. run in parallel. set initial wgdc to 60 and max to 100. i spool by 3k rpms. do a boost leak test before u tune your car. if avcs is working and your tune is correct then its mechanical.
He's not tuning the car himself.

Quote:
Originally Posted by JulianDelphiki View Post
I assuming it's mechanical considering phatbotti is tuning it as we speak.
If he's doing your tuning then I wouldn't be worried about that being your issue. Its something mechanical and my guess would be a pre-turbo exhaust leak.
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Old 04-10-2013, 06:13 PM   #6295
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I'd look for a turbo inlet leak or header/up pipe leak. I have a header to up pipe leak that needs to be fixed. It's pretty bad so you can hear it and its killing spool.
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Old 04-10-2013, 06:23 PM   #6296
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i know he isnt tuning the car himself but he can open the rom and look since he is already using ecuflash.
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Old 04-10-2013, 06:25 PM   #6297
JulianDelphiki
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I'm not tuning myself but have a pretty firm grasp of rom raider and what to tune/look for in logs. I just didn't want to take a chance with this 4k$ motor.
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Old 04-10-2013, 06:34 PM   #6298
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post a log if you dont mind or email it to me w/ wgdc logged. Brad498Bahr@aol.com. I am the local tuner in the North and East Wisconsin area so i should be able to see if there are any mistakes. phatbotti prob never makes mistakes tho
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Old 04-10-2013, 06:46 PM   #6299
JulianDelphiki
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Again, I do not think it is a tune issue considering I completely removed the waste gate hose and still saw 4k lag. I'm in the process of removing the dp, header and eventually up-pipe to check for leaks/cracks. Next is a boost leak test. Maybe the intercooler has a hole in it.
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Old 04-10-2013, 06:50 PM   #6300
JulianDelphiki
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The up pipe turbo area is squeaking unbelievably bad also
He is a YouTube link of the squeak
https://www.youtube.com/watch?v=S20K...e_gdata_player
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