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SR20VE+T low on power, please help!

Thread: SR20VE+T low on power, please help!

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Posts: 51-60 of 94
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2014-02-17 22:11:46
#51
Originally Posted by shagspeed
Is that a T2 flange turbo? IMO VVLs should not run a frame turbo smaller then a T4.. With that said have you tried to Dyno without activating VVL to see the results? Your Dyno also looks all over the place. Try to get a nice stable run without activating VVL and ensure your Dyno graph looks linear and uniform with no dips peeks or valleys.. In the event you see such an occurrence you might have a bad airflow meter or bad grounds or a power supply problem ..

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I did run it on the dyno without vvl in for the first few runs, just to check it was making power as it should. I thought the numbers were low as he'll but the graph looked fine. Was running 6psi at first and made like 140hp without vvl...then made 153 or so with vvl back in. I didn't notice the curve changing a whole lot. And yes the turbo is T2.

Originally Posted by gomba

@niSSSdan : have you checked compression yet?

-G


Negative. Got work all week, gonna try for the weekend.
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2014-02-17 22:22:50
#52
Originally Posted by niSSSdan


Negative. Got work all week, gonna try for the weekend.


ok cool, also try and get those logs
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2014-02-18 01:27:05
#53
SR20VE+T low on power, please help!
Originally Posted by niSSSdan
Originally Posted by shagspeed
Is that a T2 flange turbo? IMO VVLs should not run a frame turbo smaller then a T4.. With that said have you tried to Dyno without activating VVL to see the results? Your Dyno also looks all over the place. Try to get a nice stable run without activating VVL and ensure your Dyno graph looks linear and uniform with no dips peeks or valleys.. In the event you see such an occurrence you might have a bad airflow meter or bad grounds or a power supply problem ..

Sent from my iPad using Tapatalk HD


I did run it on the dyno without vvl in for the first few runs, just to check it was making power as it should. I thought the numbers were low as he'll but the graph looked fine. Was running 6psi at first and made like 140hp without vvl...then made 153 or so with vvl back in. I didn't notice the curve changing a whole lot. And yes the turbo is T2.

Originally Posted by gomba

@niSSSdan : have you checked compression yet?

-G


Negative. Got work all week, gonna try for the weekend.


T2 turbo is too small I think... You need a long tubular manifold large waste-gate and big turbo for VVL to work... Also having twin scroll is a huge difference as well as it reduces the back feed on overlap..


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2014-02-18 03:22:11
#54
Originally Posted by shagspeed
T2 turbo is too small I think... You need a long tubular manifold large waste-gate and big turbo for VVL to work... Also having twin scroll is a huge difference as well as it reduces the back feed on overlap..


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not correct. many guys here run stock GTiR manifolds with t28, gt28, gt30's on VE's and have zero issues...stock and mod'd engines
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2014-02-18 03:30:40
#55
Originally Posted by gomba
Originally Posted by gio94sr20ve
That forum members car @eggman on his Dyno day. Look at the graph. First pull is #1 (blue)look at his hp and the similarity in the graph to yours.
The red is after the resonator was removed and some base tuning on 2.0 cams.


Wait a second...is that an N/A VE? Look at his AFR! Goes at or below 10:1 on first run LOL...there's your problem! Unless his resonator was causing it to turn stupid rich (which could have been tuned out anyways), that's gotta be where the majority of that 40whp came from without a doubt. If his fuel was messed up I wouldn't doubt timing was also off. I think people are overestimating exhaust stuff.

I wanna see the same run w/corrected tune w/the resonator.

@niSSSdan : have you checked compression yet?

-G


maybe this will clear things up.
Run 1 was how I had the car setup to run so I could drive it to the dyno.
Heres the setup when I got there
-Stock VE with stock cams
-333 inj
-Stock DE ECU
-Stock DE MAF
-Dizzy full advanced to get it to run halfway decent.
-2.5 crushbent crappy exhaust,with horrible resonators ,apparently.
I actually thought it was running decent until I saw the first pullI drove it for a couple weeks and 4.5 hours to the dyno.
I bet theres alot of guys running their cars like this and dont even realize they are barely making more power than a bolted DE
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2014-02-18 03:41:45
#56
I don't think there's many VE guys running around with stock DE ECUs..well, I at least hope not
Last edited by gomba on 2014-02-18 at 03-44-51.
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2014-02-18 15:35:51
#57
SR20VE+T low on power, please help!
Originally Posted by chapnutz1
Originally Posted by shagspeed
T2 turbo is too small I think... You need a long tubular manifold large waste-gate and big turbo for VVL to work... Also having twin scroll is a huge difference as well as it reduces the back feed on overlap..


Sent from my iPad using Tapatalk HD


not correct. many guys here run stock GTiR manifolds with t28, gt28, gt30's on VE's and have zero issues...stock and mod'd engines


Can you link to an example?? It's all about the pressure ratio.. I'm not saying it's impossible but for example if you try to run big boost on a small turbo with high overlap you going to burn up the motor and make no power.. You run small turbo you need HUGE bypass volume .. Again it's about the pressure ratio..

I also think if you're a turbo VE and you're not making over 400WHP you're using the wrong engine for your goal.. VEs are a go big or go home.. There ain't no half stepin ..

On a 2.0L engine on 444cc of fuel I made about 340whp on 3bar FP ...


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2014-02-18 19:33:54
#58
Originally Posted by shagspeed
Originally Posted by chapnutz1
Originally Posted by shagspeed
T2 turbo is too small I think... You need a long tubular manifold large waste-gate and big turbo for VVL to work... Also having twin scroll is a huge difference as well as it reduces the back feed on overlap..


Sent from my iPad using Tapatalk HD


not correct. many guys here run stock GTiR manifolds with t28, gt28, gt30's on VE's and have zero issues...stock and mod'd engines


Can you link to an example?? It's all about the pressure ratio.. I'm not saying it's impossible but for example if you try to run big boost on a small turbo with high overlap you going to burn up the motor and make no power.. You run small turbo you need HUGE bypass volume .. Again it's about the pressure ratio..

I also think if you're a turbo VE and you're not making over 400WHP you're using the wrong engine for your goal.. VEs are a go big or go home.. There ain't no half stepin ..

On a 2.0L engine on 444cc of fuel I made about 340whp on 3bar FP ...


Sent from my iPad using Tapatalk HD


I call bull shit, I run 520cc injectors an am at 80% duty cycle on 3 bar and im not over 300 whp

My ve's been boosted for 2 years an hasnt blown up yet.
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2014-02-18 21:02:33
#59
Big john made 270whp on a stock ve with a t25 using the internal waste gate.
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2014-02-18 21:21:24
#60
Originally Posted by lynchfourtwenty
I call bull shit, I run 520cc injectors an am at 80% duty cycle on 3 bar and im not over 300 whp


Probably user-error...
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