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 More Power Out Of Sr20de - got ne ideas for more power  

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wantingboost
  • wantingboost
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  • Member No.: 56,495
  • Joined: 23-November 06
  • Posts: 280
Post #1 post 30th December 2006 - 11:10 PM
I have a N14 pulsar with an SR20de in it. it goes quite well but im lookin for more power with out turboin it
just wanna know wat the best bang for buck is.

Mods at the moment include Pod filter, hd clutch n 2 n quarter cat back exhaust.

Cheers
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TwinCam16
Post #2

Bolt on the turbo to your motor smile.gif

punksnut
Post #3

buy an sr20VE, good luck finding one, and if you do itll prolly be as expensive as an s13 srT

lo_rolla
Post #4

You could biuld a tough NA motor, but it's not gonna be cheap.

Free flowing heads, tough high compression bottom end, quad throttles, proper extractors and a good tune....

Get it rev'n hard.

But at the end of the dat you'll get more power, and it'll be cheaper to put sr20det in.
70YIN_180
Post #5

Honestly, there really isnt a lot you can do without throwing a hell of a lot of money into, in which you will get a poor return.. if you are serious about it, as others have said, you are best off (power and finance wise) removing your motor an putting an sr20det in..

Mr_Sleepy
Post #6

oh god, im gonna shoot myself the next time someone says put a sr20det in it.. he said he wanted to keep it n/a..

now these mods are what i would do if i wanted more power from a na sr without spending a shit load.. take note, these sugestions will only be cost efective if your handy with a spanner..

first of all the inlet:
quad throttles are out of the equation as there just way to expensive. what i suggest you do is purchase another std manifold and send it down south to be ported and cleaned up by abbrasive power porting.. this will enlarge the inlet runners and clean up the casting dags witch rob air flow..
then i would go over every part of you inlet track and check theres nothing holding it back in power..

the exaust:
you allready have a reasonable exaust except i would fit a set of extractors and one of those metalic/magic cats they advertise in hot4s and zoom.

the flywheel:
yes i know you dont get a horsepower gain from this but there is a actually accelaration/response difference you can feel and measure. so its worth fitting a light weight flywheel..

cams & cam gears:
cams for a turbo SR are pretty cheap and you can actually get some pretty decent grinds in turbo form.. only problem is that they generally have less lobe seperation to stop the boost leaking out the exaust.. but this doesnt matter that much if you use a set of cam gears and set the cams up for a bit more lobe seperation.. doing it this way will be half the price of a set of good N/A cams without cam gears and the results will be pretty good..

a decent engine management system without an airflow meter:
you can actually purchase s/h microtechs (current model) for pretty cheap. its too the point that if you wire it up yourself you can have them fitted and tuned for less than $1400.. by fitting a microtech/haltech you can do away with that airflow meter which restricts just a little flow and you can obtain a decent tune.. basicly all of the above mods are worthless without a decent tune to suit..




these are only just a few quick cheap mods.. theres a few more you can do but this will give your sr a bit of a kick without opening the motor and breaking the bank..
mad082
Post #7

a set of extractors will open it up immensly. i used to have a n15 SSS (its the missus now) and it has a 2" cat back, a set of genie extractors and a k&n panel filter in the stock box with a cold air feed from the front bar. on the dyno it made 112hp. the extractors made a huge difference above abuot 4500rpm. you probably know that with the stock headers it feels as if it is choking above 5000rpm. with the extractors it will go a touch better in the low rev range, and then when it gets to about 4500rpm it will come alive.

the next thing i want to do is put the 2.5" cat off my r33 on there to let that flow a bit more.

TwinCam16
Post #8

Why? everyone thinks the cat converter is the root of all evil.

...Far far from it...

mad082
Post #9

the cat converter is the biggest restriction in the exhaust. by going to a bigger cat it will the air to flow faster.
TwinCam16
Post #10

Can you lay some evidence to prove your theory?

wantingboost
Post #11

thanks for the ideas guys keep em coming. cheers
mad082
Post #12

QUOTE
Can you lay some evidence to prove your theory?

can you lay some evidence to prove that having a restricting cat is a good thing?

TwinCam16
Post #13

head_wall.gif

Your the one making the claim here.

Every dyno test i have seen / witnesed regarding the old wifes tale bout cats being the problem has turned out to be exactly that, nothing more than uneducated rumours.

Now, if you have a 2 inch system or even a 2.25, putting a 2.5 inch cat is not going to get your any gains what so ever.

... and thats not even taking into account the physics behind it having to go back into the same size pipe it has comming into it anyway... rolleyes.gif

Mr_Sleepy
Post #14

hey, i just said add a performance type cat..

considering that the car is now pretty old, the factory one isnt gonna perform as well as a new one. i have seen reasonable gains using these cats i mentioned, they definetly flow better (especially better than a 12+ year old cat).. dont expect anything huge but thats to be expected from a n/a powered car..
MYB16
Post #15

i would have to say the biggest gain will be from headers - 4 into 1 for top end power and 4-2-1 for bottom/mid range. then as stated cams, valve train, high comp pistons, port and polish and ECU...they are the basics...

then you can look into quad throttles, stroker kits etc to start really pushing it n/a...but if you are running quad throttles you will require a very good ecu and an even better tune to get it running smoothly, due to there being 4 seperate throttle bodies/intakes - its harder then it sounds

but well worth it in the end..

Aiko
Post #16

A free(er) flowing cat will make 'some' difference, although probably not huge on a SR20DE.
I've played with the SR20DET on the dyno quite a bit with changing the cat for varioius models. Geting around a 4.5% increase from the stock 12year old cat to a new larger cat.
Bearing in mind that you also don't want to change pipe diameters rapidly, ie. like 2" front pipe directly to 3" cat + cat back. If you're doing this, better to have an intermediate section in the front pipe that gradually expands from 2" to 3" (sizes just as examples) to keep the gases flowing smoothly.
This was with a turbo, so gains on an N/A are probably going to be less but potentially still worthwhile.
R.

CApower
Post #17

being NA you would not want to go oversize on cat or exhaust. You need some backpressue in your exhaust or you will loose power.

turbo_LTD
Post #18

now i know you did not mean that you need back pressure in the exhaust of a n/a car to get it to run well.
backpressure is the byproduct of having smaller pipe diameters to maintain gas velocity...

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