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Old 08-01-2012, 06:17 PM   #1
spec_bg
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Default underpowered with dom1.5?

so i have this turbo on my fxt 5spd and im wandering if i should have went with something else. i have the usual boltons, tgv deletes,txs tmic etc.

im running around 19psi. it reaches 19psi at around 3900rpm. it is hot here and i thought that was why it didnt feel very powerful. that is until my buddy with a sti vf39 and cams put a car length on me and kept that lead from a 2nd gear roll. with my gearing and bigger turbo it should have been the opposite, after that, i started thinking something was up.

it seems most posted dyno numbers here are averaging 350 with this turbo. i am running a etune. logging , im hitting 70% idc with dw 850's. 4.8 maf volts, 302 maf g's. all this at around 6500rpm. it doesnt feel that much different from when i had my vf43 installed. the only mods the sti had different from me are cams,fmic and ap uel header. theres not a big weight difference either between fxt and sti

i guess i had higher hopes for this setup after spending this much on turbo and inj.
im curious what other people with this turbo and inj and 93 octane are logging as far as idc,maf v and g's. is 300 on airboy with this heat equal 350 on a dyno? i know its just numbers but i dont want to leave 50 horses on the table either. thanks

Last edited by spec_bg; 08-01-2012 at 07:30 PM.
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Old 08-01-2012, 08:37 PM   #2
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man...sounds like ya got a bad tune

get it tuned by a local tuner
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Old 08-05-2012, 10:07 PM   #3
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Quote:
Originally Posted by Uncle Scotty View Post
man...sounds like ya got a bad tune

get it tuned by a local tuner
about time they ban your dumbass.
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Old 08-07-2012, 01:30 AM   #4
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Quote:
Originally Posted by VisBits

about time they ban your dumbass.
60,000 post vs. your 145.... And countless advice stickies and posts. You might not want to tell someone they are a dumbass. Especially since everyone agreed with him. Have a good night
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Old 08-07-2012, 01:41 AM   #5
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about time they ban your dumbass.
dddoooooooddddd gtfo.
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Old 08-01-2012, 10:44 PM   #6
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Your tune is horrible. Heat or not your turbo should run circles around a VF39. He is having the same affects of the heat as you are, and your turbo is substantially larger. From a roll he shouldn't stand a chance because spool time should be out of the picture. From a dig I could understand him getting a nose on you from the initial launch but you should easily gain that back and walk away from him. I'd demand an retune or a refund. Do some data logging to see what your car is really doing.

Edit: what fuels are both cars running? If you were pump and he's E85 or pump and meth then this MIGHT be possible, but other than that if your running same fueling I'd blame the tune.
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Old 08-03-2012, 04:46 PM   #7
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Quote:
Originally Posted by Uncle Scotty View Post
man...sounds like ya got a bad tune

get it tuned by a local tuner
Quote:
Originally Posted by LBell05STI View Post
Your tune is horrible.
Its comical how after just the initial post you guys jump to its a horrible tune. How did you rule anything and everything else out?

FWIW comparing g/s between vehicles just doesnt work unless the injectors scalar/latency, maf scale and OL fueling table are exactly the same. If they are not, then the numbers wont match up.

Hey Northman, how about you send me a log with just time and rpm....and I will plot yours up against brandons. My email is r-j-w@rocketmail.com

The car makes power through boost, timing and fuel.....so if northman is running the same boost, timing and fueling....then the power should be very similar. If one is drastically different from the other powerwise, then there may be a difference in parts....or something wrong with car. Or email the guy that put down 370whp on topspeeds dynojet and ask him his boost, timing and fueling #'s.....i can almost guarantee you that they are very close to yours.

Something like a coil pack going bad....or as someone else suggested the turbo inlet sucking shut can have drastic effects on power.

The car is running 20psi tapering to 18, 14* up to 22*, and 11 afr tapering to 10.8.

I cant add more boost because the MAFv is 4.8+ volts in 100+* IATs.

Here is brandons car vf vs dom1.5. The car picked up tons of hp....but the neck snapping tq is gone.

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Old 08-03-2012, 05:02 PM   #8
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Quote:
Originally Posted by Phatron View Post

Hey Northman, how about you send me a log with just time and rpm....and I will plot yours up against brandons.
I can do this, but it is not easy for me to find a good place to log. That last one I did is a great stretch of road with no sidestreets or driveways, but it is going up a fairly substantial hill. I'm guessing that would mess up a time/rpm plot. But I'll see what I can do, 3rd gear OK?
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Old 08-02-2012, 02:09 AM   #9
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I don't want to bash e-tunes because they are great in many cases. But a new turbo and injectors is a big change and would require many pulls and revisions. How many revisions did you do so far? You should post some logs to see if anyone wants to offer an opinion on what's going on. And you may want to consider going to where your tuner is or pick one that you can go to.
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Old 08-02-2012, 07:08 AM   #10
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26 revisions, ive taken alot of logs during the process. we are both on 93 pump and hes running a tune he worked on himself. another buddy running the dom1.5 said the same thing you guys are but hes on e85 making 416 from topspeed which is where i almost went but couldnt get a limp map there plus i just spent all that money on the etune.

the guy with the vf39 is tapering to like 11psi and im holding 18psi and still couldnt catch him. we compared logs and hes running more timing, like 8 degrees more throughout, i wasnt sure if he had too much timing or i had too little, he isnt knocking and mine seemed like a normal range going off other peoples logs on here.

before he flashed a more aggressive timing map i put a nose on him barely.even still it just doesnt feel that much more powerful than my vf setup i can tell a lil bit on the topend. im using a aem uego to log. logs show 10.8-11 wot then 10.7 at 4.8 maf volts at the very end. figured that was for safety.

Last edited by spec_bg; 08-02-2012 at 07:29 AM.
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Old 08-02-2012, 12:19 PM   #11
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Ya man, my 20g could keep with a VF52 WRX till about 70 and after that I pull away much stronger. I'm dropping in a Dom1.5 as well and expecting it to go even beyond that as well. Something isn't right on the tune.
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Old 08-02-2012, 03:39 PM   #12
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I can take a couple logs and see how mine compares.


Did a quick run up a hill, in 3rd

idc 75 (ID1000 injectors)
maf v 4.85
maf g/s 350
18 psi

fuel is 92 oct

Last edited by northman; 08-02-2012 at 06:55 PM.
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Old 08-02-2012, 05:54 PM   #13
spec_bg
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thanks, i would appreciate it.
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Old 08-02-2012, 06:20 PM   #14
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Just as stated before your Dom 1.5 should run circles around that VF39. I would know because I had a VF39 in my 06 STI and I'm now running the Dom 1.5. I was on 850cc injectors as well and it was significantly "faster" than it was before. Even in the heat you shouldn't have a problem stomping face with that turbo. Your tune prolly sucks. I would say you need to be tuned either on dyno or a road tune or both would be best. I since switched to 1000cc injectors and made 380hp on 93, and 445hp on E85. I love the Dom 1.5
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Old 08-02-2012, 06:31 PM   #15
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Sounds like you're almost maxing out your maf too.
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Old 08-02-2012, 06:34 PM   #16
spec_bg
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it sucks because this etune was expensive and now i have to spend more to bring it to a shop. i mean this thing barely puts me back in the seat for just a quick second.

i might be close to maxing the maf out but it doesnt feel like it power wise. thats what i didnt understand, if im running 19psi at 4.8 maf volts then i should be making power. the 4.8 only happens in the last couple hundred rpms. its not hitting that until about 6250 rpm
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Old 08-02-2012, 06:59 PM   #17
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updated my previous post with a few log numbers. It seems to me that if the turbo is putting out 18 psi to redline, it is doing its job. If there is a lack of power, then there is a problem elsewhere.
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Old 08-02-2012, 07:27 PM   #18
spec_bg
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thanks, your hitting 350g's where im only hitting 300g's, you dynoed around 350 if i recall, so that sounds about right. im running 850's and it hits 70% at 6500rpm. do you have a wideband? what your afr under wot? thanks
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Old 08-02-2012, 07:32 PM   #19
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Originally Posted by spec_bg View Post
thanks, your hitting 350g's where im only hitting 300g's, you dynoed around 350 if i recall, so that sounds about right. im running 850's and it hits 70% at 6500rpm. do you have a wideband? what your afr under wot? thanks
I do have a wideband, but it does not log through the AP. According to the dyno database at Cobb I'm at 11.1 or 11.2
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Old 08-02-2012, 07:51 PM   #20
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seems to me that if things are healthy, not making power despite boosting 18 psi at redline would imply a flow restriction somewhere post-turbo. Perhaps a catted downpipe on the outs, or a muffler coming apart?

If nothing obvious I would probably start diagnoses with a leakdown test.
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Old 08-02-2012, 08:45 PM   #21
spec_bg
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im not the only one it appears thats having this same problem.

im running catless exhaust and upipe,txs tmic aps cai perrin inlet tgv deletes,etc. i have almost same mods as you if i recall from forester forums. my maf limit is set to 316 when i looked in ecuflash not sure if that means anything.

i made 285whp and 315tq with vf 43 when i had my car dynoed at topspeed last year, those seem like normal numbers for stg2 sti on 93oct
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Old 08-02-2012, 09:21 PM   #22
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http://forums.nasioc.com/forums/show....php?t=2277357

Give Ron a PM, he will be glad to help... double check for boost leak.
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Old 08-03-2012, 07:13 AM   #23
spec_bg
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no boost leaks. ron is who tuned it. im not sure if its overly safe or what, i like the other aspects of the tune its just not powerful. i shouldnt be pulled on by a vf .

if maf g's is close to determining hp than northman is at 350 which is what he dynoed at and im at 300. there is another guy with wrx in the power braggin section that airboyed only 300 with this turbo with the same tuner. so does 70%idc on 850's and 300 g's 4.8 maf v at 6500 rpm sound like normal?looks like the g's are down
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Old 08-03-2012, 08:29 AM   #24
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What kind of inlet are you using? What bypass valve?

My buddy collapsed his stock inlet on a dom2.5xt at 18#.

I replaced my stock bpv (when tuned at 19psi) with a GFB unit and I now peak at 25# (lol not safe, figured that one out on accident)

Plus, don't get all caught up in numbers. You should really evaluate the compatibility of your mods and see if the dom1.5 is what you were looking for in the first place.
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Old 08-03-2012, 12:15 PM   #25
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I'd ask for a refund on the e-tune...then get ahold of STI Mikey (phatbotti).
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