# top end power loss sr20det
**URL:** https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757
**Category:** SON240sx Automotive
**Created:** [September 26, 2008, 9:54am UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757 "2008-09-26T09:54:10Z")
**Posts on this page:** 20
**Page:** 1
### Author:  [@matt\_sr20det](https://forums.speedlife.net/u/matt_sr20det)
#### Post date: [September 26, 2008, 9:54am UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/1 "2008-09-26T09:54:10Z")
I have an sr20det and i just swapped out my stock 370cc fuel injectors for new 550cc injectors. Now when i drive, i feel the boost, but at top end around 4-5000 rpm it loses all boost and wants to quit on me…anyone know why…
if its overfueling what should i do?
thanks
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### Author:  [@absolum](https://forums.speedlife.net/u/absolum)
#### Post date: [September 26, 2008, 10:19am UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/2 "2008-09-26T10:19:39Z")
you are most likely running right as hell.
Get a fuel management system in order to back off on the fuel. Your ECU still think you have the 370cc installed and pumping about 27% of additinal fuel at any given RPM . More under boost.
I am surprise your car is even running… WoW
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### Author:  [@DTS](https://forums.speedlife.net/u/DTS)
#### Post date: [September 26, 2008, 10:30am UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/3 "2008-09-26T10:30:45Z")
This is a great thread.
I like the cut of your jib, matt\_sr20det.
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### Author:  [@system](https://forums.speedlife.net/u/system)
#### Post date: [September 26, 2008, 10:53am UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/4 "2008-09-26T10:53:42Z")
so is there any fuel management besides the stock pressure regulator ??
farmer
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### Author:  [@sil8t](https://forums.speedlife.net/u/sil8t)
#### Post date: [September 26, 2008, 11:01am UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/5 "2008-09-26T11:01:53Z")
u need wider rims, that is ur problem.
did u do any research before this or putn bigger injectors in with no managment at all, seemed like a great idea
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### Author:  [@veloz](https://forums.speedlife.net/u/veloz)
#### Post date: [September 26, 2008, 12:49pm UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/6 "2008-09-26T12:49:39Z")
^^^
LOL
You are dumping 33% more fuel in there than your computer “sees”.
car must feel slower than it did before
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### Author:  [@jammin1911](https://forums.speedlife.net/u/jammin1911)
#### Post date: [September 26, 2008, 1:10pm UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/7 "2008-09-26T13:10:51Z")
… what the fuck
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### Author:  [@Tacoboy](https://forums.speedlife.net/u/Tacoboy)
#### Post date: [September 26, 2008, 1:29pm UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/8 "2008-09-26T13:29:15Z")
lol @ this thread. IBTL.
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### Author:  [@matt\_sr20det](https://forums.speedlife.net/u/matt_sr20det)
#### Post date: [September 26, 2008, 6:38pm UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/9 "2008-09-26T18:38:52Z")
so what should i do next to fix this?..
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### Author:  [@nitescream](https://forums.speedlife.net/u/nitescream)
#### Post date: [September 26, 2008, 6:41pm UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/10 "2008-09-26T18:41:17Z")
back off fuel… SAFC-II or AEM, Greddy E-mange… anything that allows u to controller fuel
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### Author:  [@jammin1911](https://forums.speedlife.net/u/jammin1911)
#### Post date: [September 26, 2008, 6:54pm UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/11 "2008-09-26T18:54:19Z")
or put the stock injectors back in since having 550’s on your car isn’t going to help anything at all…
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### Author:  [@matt\_sr20det](https://forums.speedlife.net/u/matt_sr20det)
#### Post date: [September 26, 2008, 7:02pm UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/12 "2008-09-26T19:02:01Z")
my injectors were bad and was was non-functional so i got the 550’s from someone…
what would be the best fuel management system to run on the sr set-up?
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### Author:  [@Gonad](https://forums.speedlife.net/u/Gonad)
#### Post date: [September 26, 2008, 11:49pm UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/13 "2008-09-26T23:49:30Z")
> [@Wallet Phone!](https://forums.speedlife.net/t/wallet-phone/18499/19):
>
> my injectors were bad and was was non-functional so i got the 550’s from someone…
> what would be the best fuel management system to run on the sr set-up?
Best? You have a few choices: AEM EMS, Power FC, Haltech, Motec, just to name a few etc. Prepare to spend $1000-$1500 + tuning
Or, if you just want to get the 550 working, get an SAFC - ~$200 and a few hours and you’re set.
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### Author:  [@Fobwall](https://forums.speedlife.net/u/Fobwall)
#### Post date: [September 27, 2008, 4:39am UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/14 "2008-09-27T04:39:21Z")
Nice, I didn’t know a car will run if you just put 550s on it with no tuning. Your car should pull a lot harder now.
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### Author:  [@R33](https://forums.speedlife.net/u/R33)
#### Post date: [September 27, 2008, 4:50am UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/15 "2008-09-27T04:50:03Z")
crank up the boost on the turbine to 16 psi and you’ll be mint.
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### Author:  [@schwiin\_27](https://forums.speedlife.net/u/schwiin_27)
#### Post date: [September 27, 2008, 7:58am UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/16 "2008-09-27T07:58:30Z")
u cant just drop in those injectors and go , im in the same boat i have a set of 555 sitting on my desk but the ecu has to be redone i looking into the nistune option! 400 from australia then someone to tune it so still well under a grand! the other thing is upping yourmaf sensor , more fuel + more air. dont
waste money on the safc II
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### Author:  [@Hurricane](https://forums.speedlife.net/u/Hurricane)
#### Post date: [September 27, 2008, 1:52pm UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/17 "2008-09-27T13:52:13Z")
This thread is incredible… they all sound like great ideas at 1.25/L.
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### Author:  [@schwiin\_27](https://forums.speedlife.net/u/schwiin_27)
#### Post date: [September 28, 2008, 11:24am UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/18 "2008-09-28T11:24:51Z")
performance isnt cheap on gas, you should know that if u have a 12.7 time posted, betcha that doesnt get 35mpg
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### Author:  [@Gonad](https://forums.speedlife.net/u/Gonad)
#### Post date: [September 28, 2008, 11:38am UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/19 "2008-09-28T11:38:59Z")
> [@Feeler: Signed Stick by ALL 91-92 sabres](https://forums.speedlife.net/t/feeler-signed-stick-by-all-91-92-sabres/18436/12):
>
> performance isnt cheap on gas, you should know that if u have a 12.7 time posted, betcha that doesnt get 35mpg
The 12.7 is on a T25 @ 14psi 🤣
Don’t temp Dustin.
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### Author:  [@jammin1911](https://forums.speedlife.net/u/jammin1911)
#### Post date: [September 28, 2008, 1:32pm UTC](https://forums.speedlife.net/t/top-end-power-loss-sr20det/118757/20 "2008-09-28T13:32:51Z")
> [@Feeler: Signed Stick by ALL 91-92 sabres](https://forums.speedlife.net/t/feeler-signed-stick-by-all-91-92-sabres/18436/12):
>
> performance isnt cheap on gas, you should know that if u have a 12.7 time posted, betcha that doesnt get 35mpg
rofl yea like gonad said, I’d be careful who you call out there 😉
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