Thread: SR20DE dyno power write up

Ok guys here is a thread that will anwser most of if not all of your questions on popular bolt-ons for the SR20DE motor. Please try not to cloud this thread up with you should of done this or that. i did all of these on purpose with this specific inteniton of sharing my findings. if you have questions please dont hesitate to ask pm me and ill post it in the thead
Mac

First off this is a 1991 Sentra SER with roughly 169XXX miles. AC is still in and will be removed at a later date.

Modifacations in the thread include:
Aem Cold air intake
Ebay 2.5" header
Obx test pipe
Jim Wolf Technology S3 cams
JWT ecu tune
HKS Sport Exhaust
9lbs. Flywheel


Base line power

the 119 and 120hp pulls where in 4th
the 102 was in 4th with the ac on. i aways wondered what the Hp drop was with the ac on. now i know.







INTAKE
Here is the dyno with the AEM Cai installed. i used the my 119whp run as an overlay cause it doesnt have the dip the 120whp does and is more realisticly the accurate pull.

Most of you will laugh at the fact that i made almost 4whp over stock. but as you can see there is more to the gains then peak HP. and im sure that a few of you know that power band is more important then peak hp.

You can see in the graph that from 3300rpm to 5000rpms i am making more HP then on the stock pull. but from 5k rpms to 5.7k rpms i am making the same as stock. from 5.7k rpms to redline i am making much more then i was stock. in some parts around10-12whp more. also my peak hp is moved to almost 6.5krpms. about 300rpm later then stock. torque is almost not changed at all. this is a good thing and a bad thing but does not effect the feel of the car at all.


the over all feel of the car now is very smooth in the top end and feels much better. i can feel the car pull more but i am very aware that there is some mental aspect to that.

Exhaust

Here is the dyno with the hks exhaust and i must say i am very impressed with the findings. much better then i expected. in this its my base, Intake Installed, and intake and exhaust installed you can see the top end gained a very good amount of power as much as 20whp over stock. cant wait to get headers and see the gains. the exhaust is to quiet so im going to be installing a test pipe. well see if any gains are produced





JWT S3 CAMS, JWT ECU, AND TEST PIPE
Installed the JWT S3 cams and test pipe. i was very inpressed with the gains. the torque is unbeliveable. the intake exhaust run is the last dyno i had.Now the cam run is very impressive with the amount of torque it is making. you can also see that the line is much smoother then the blue run. this is due to a new cap , rotor and wires. the parts are not new but they are nissan where my car had cheap aftermarket set on them, so they are new to the car. the s3 cams with JWT ECU run is not bad at all raising the HP and TQ all through the power band. well some would take that flash as a waste of money but the car did make more power and idles much smoother now then it did with out it. the drivablity is also better with it.





HEADER
heres the dyno with a ebay header and a 2.5" outlet. The Blue Run is the header installed and the Red Run is the last run i did see above for more info on that run. the headers were a great complement to the whole setup i have going right now. you can see that every part of the rpm range has a gain, not one spot does not. the peak is only 7whp which is more then i was expecting. this doesnt exactly mean if you put just a header on it will provide this kind of HP i think with the cams intake ect they are a good compliment for it all.





FLYWHEEL

dyno with the flywheel only made 2whp and 2wtq at peak but like all the other mods its is through out the power band. the engine revs much smoother and faster. rev match is like breathing its super easy.





i installed my factory cat and looks like i lost alot of power through out. sucks but now i dont have any buzz in the exhaust anymore.

Is it cool if I add my mod list and dyno sheet as well? I still need to get my other dyno sheet that I did recently at 19* timing but I have the one at 10* timing.

Interesting to see it listed out like this. Well done mate

theres a dyno thread that you can post up in. this is an informational thread.

I'd say you could swap that catalytic converter for a bigger resonator and the power should jump back up to where it was, without the annoying buzzing from the exhaust.

This is a good thread for someone trying to get an idea of what kind of power the engine is making. Very well laid out as well.

Seeing as it looks like your trying to be somewhat budget minded I would suggest trying an safc2 rather then the JWT ecu. I'm curious to see what your a/f was on those runs. If your running rich there may still be a lot of power to pick up with the safc2, and more timing.

Just fyi when I was tuning my turbo setup I jumped 20-30whp from getting the a/f ratio where it was suppose to be.

Obviously a real standalone would be ideal, but that is lots of money$$$.

I'm glad to see this over here. I remember reading it a long time ago.
I have a question for yah that wouldn't clutter things too much I don't think. I believe the ECU disengages the A/C compressor after 5k rpm. What did you do to prevent this in for your first dyno sheet?

i didnt do anything i dont think that the b13s do that, i know on newer cars it does that.

It would seem by your dyno graph that you're right, but I recall many comments in the past about people feeling like an anchor had just been released from their car at 5k rpm with the A/C running and it was "common knowledge" that the ECU disengaged the compressor at 5k rpm on B13s (1991) and newer (at the least).

macidcrook, did you want to have a separate discussion thread for this thread?

If I close this thread, then you wont be able to update it, unless you get ahold of one of us (mods).

Another thing I can do is leave it open and just monitor it for anyone junk posting. Lemme know which ever route you want to go.