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Old 12-11-2012, 04:52 PM   #1
squarebush
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Join Date: Mar 2008
Location: Nashua NH
Default how bad SHOULD my engine be running?

So I just finished a 2.5 Build to swap into my WRX. I'm running it like a hybrid, as in, all WRX sensors, wiring, and ECU) she starts and runs BUT does NOT like running in closed loop. She runs fine on the throttle, but dips hard or even dies when I let off the throttle causing it to switch back to closed loop running. I have changed EVERYTHING abount this engine so I believe it to just be a problem of having the different MAF housing, but it seems to be reacting a lot like a vacuum leak, but it held 20PSI fine when I did a boost leak test. I also noticed that there seems to be quite a bit of air flow through the PCV valve.


Currently tuned for:
stage 2 wrx
TGV deletes
custom FMIC
SPT intake


Current engine:
2.5 block with 8.9:1 weisco pistons 100mm
lightened and balanced rotating assembly
255 heads, deleted avcs, +1mm valves, wrx cams
megan UEL header
custom 3" maf housing (stock that has been taken out of the air box, and significantly bored.)
TD04 19T IWG (for beak in miles, my HTA68 is out for a re-build)
820cc injectors topfeed
2.5i manifold customized to work with DBC throttle body
VTA (temporarily) BOV
catless

amy input on mechanical vs. Tune culprit would be appreciated.
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Old 12-11-2012, 05:11 PM   #2
04ScoobyWtf
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What mods did you put on when you put it back together? That aren't tuned for
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Old 12-11-2012, 05:16 PM   #3
squarebush
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Quote:
Originally Posted by 04ScoobyWtf View Post
What mods did you put on when you put it back together? That aren't tuned for

everything.... literately.
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Old 12-11-2012, 05:18 PM   #4
ToneWrx02
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Silver

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so ur not tuned for the new parts. ..
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Old 12-11-2012, 05:24 PM   #5
squarebush
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Quote:
Originally Posted by ToneWrx02 View Post
so ur not tuned for the new parts. ..
no, I need to get it to run long enough to get it to my tuner. I assumed apparently wrongly that the old tune would run it "enough" that I could drive the 30 mins to my tuner (kinetic motorsports) I emailed my tuner and asked if he could email me a base map(my friend has a tactrix), but I'm still not sure if there is something mechanically wrong.
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Old 12-11-2012, 05:31 PM   #6
02rex62
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Are you throwing any check engine codes?
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Old 12-11-2012, 06:19 PM   #7
squarebush
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Only one i know of is Evap i haven't plumber in the soenoid yet, i will check again after dinner.
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Old 12-11-2012, 06:21 PM   #8
02rex62
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So you changed your injectors without changing your tune?
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Old 12-11-2012, 06:24 PM   #9
squarebush
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P0102, maf signal low input. Works with my maf housing theory. So basically i thing i just really need my maf scalled
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Old 12-11-2012, 06:27 PM   #10
drewvdw
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Dude. Don't run your car. Your MAF is all messed up and your injectors need to be tuned for too. Those two things alone are enough to **** up your car, especially with a freshly built engine. You're lucky if you haven't ruined it already. Forget the fact that you're using a tune for a 2.0 for a 2.5 and an aftermarket turbo.
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Old 12-11-2012, 06:28 PM   #11
squarebush
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Quote:
Originally Posted by 02rex62 View Post
So you changed your injectors without changing your tune?
Yes, I'm trying to get it stable enough to drive to the tuners. It's a completely new engine and i know it needs tuned, my problem is getting it there safely. I'm also not sure if my problem is entirely tune related. That's my main question, what should it run like with a way wrong tune?
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Old 12-11-2012, 06:29 PM   #12
02rex62
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Are you sure your maf is plugged in? Even with the maf not scaled right I'm pretty sure it shouldn't be throwing that code!
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Old 12-11-2012, 06:29 PM   #13
drewvdw
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It shouldn't be run at all without a tune. Flatbed or trailer it to your tuner.
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Old 12-11-2012, 06:32 PM   #14
squarebush
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Quote:
Originally Posted by drewvdw View Post
Dude. Don't run your car. Your MAF is all messed up and your injectors need to be tuned for too. Those two things alone are enough to **** up your car, especially with a freshly built engine. You're lucky if you haven't ruined it already. Forget the fact that you're using a tune for a 2.0 for a 2.5 and an aftermarket turbo.
Is the problem entirely tune? That's what i am asking.

It needs to run to be tuned, I'm working on getting a base map, but that would be a lot easier if i could .get the car to the tuners
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Old 12-11-2012, 06:33 PM   #15
squarebush
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Quote:
Originally Posted by 02rex62 View Post
Are you sure your maf is plugged in? Even with the maf not scaled right I'm pretty sure it shouldn't be throwing that code!

I may have unplugged it with the key on while i was troubleshooting, i don't think it will come back if i delete it.
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Old 12-11-2012, 06:36 PM   #16
02rex62
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Quote:
Originally Posted by drewvdw View Post
It shouldn't be run at all without a tune. Flatbed or trailer it to your tuner.
^Def a good option!
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Old 12-11-2012, 06:55 PM   #17
FuJi K
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You changed the MAF housing size and the injectors. Tell your tuner your mods, he should be able to make you a map before tuning. And tow it to the shop and have deep pockets.
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Old 12-11-2012, 07:27 PM   #18
drewvdw
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MPS powered.

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The tuner can't even make him a real safe limp map because he went and did a custom intake. What he needs to do is stop trying to run it to see if it's okay to run and bring it to the tuner. The tuner will be able to put a relatively safe tune in to get it running based on mods other than the intake, then he'll work everything else out.

OP, do yourself a favor and quit running the car before you need to build another engine. No, you don't have to run it in order to get a safe tune to start with. A good tuner will know what he has to do to start and run it safely at idle. Then and ONLY then will you be able to figure out if everything is done right.
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Old 12-12-2012, 09:36 AM   #19
tja1618
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Because of things like this I'm leaning toward paying my tuner to come to my garage for my initial startup. Either that or towing it to the shop. You might as well pay someone with experience to help break in your new investment.
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Old 12-12-2012, 12:18 PM   #20
squarebush
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I want to make sure eveyone who has been reading this knows I am NOT driving the car, I have run it for a few short runs to check for leaks ect. and am not ready to bring it to the tuner, I was hopping to drive it there, but it looks like I will be renting a trailer... except all the money I have at the moment is already destined for my tuner...
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Old 12-12-2012, 03:39 PM   #21
thebeephaha
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CrossSports Sierra Gold

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Quote:
Originally Posted by squarebush View Post
I want to make sure eveyone who has been reading this knows I am NOT driving the car, I have run it for a few short runs to check for leaks ect. and am not ready to bring it to the tuner, I was hopping to drive it there, but it looks like I will be renting a trailer... except all the money I have at the moment is already destined for my tuner...
Doesn't matter if you aren't driving it or not, running it idle on a crap tune can still hurt the engine. Save up more cash, trailer and tune.
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Old 12-12-2012, 03:57 PM   #22
drewvdw
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MPS powered.

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1. Find buddy with trailer.
2. Get case of beer.
3. Ride with buddy to tuner.
4. Meet back to buddy's place.
5. ???
6. Profit.

Alternately, if you can't complete step 1, ask a buddy to see if they know someone with a trailer.
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Old 12-12-2012, 04:29 PM   #23
squarebush
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I've been calling all my friends trying to find a friend with a friend with a trailer, and nothing... All the shops I have out in use flatbed trucks for their transporting needs. I know my father has a semi-local friend with a trailer, but I'm not sure if I can get a hold of him, (A have a slot at the tuners for tomorrow morning. My tuner, who is VERY reputable, seems to think he can email me a base map so the car can make the 20 mi drive, but I'd still rather a trailer.
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Old 12-12-2012, 04:49 PM   #24
drewvdw
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MPS powered.

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Who is your tuner?
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Old 12-12-2012, 05:32 PM   #25
squarebush
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