Sr20det Performance?

[SrS13]

Ok I'm starting to get the hang of this feathering the throttle as I let out the clutch it seems to be really helping out my holeshot.

I was wondering if my Sr20 is performing the way it should:

When I floor the throttle all the way I emidiately reach full boost at around 3500-400rpms is that normal?? at 12psi

Also By boosting up would I need to advance or retard my timing or is stock setting OK??

The car also performs kind of slugish but would that be because I have the stock 240 piping connected halfway to the 3" downpipe????

Thanks for viewing and replying I'm trying to soak up as much info as possible. And I learn by asking questions lots of them.

[slw240sx]

Quote »The car also performs kind of slugish but would that be because I have the stock 240 piping connected halfway to the 3" downpipe????[/quote]

please explain that !! i dont quite under stand it !

also what is your timming set at !?!?

[pampadori]

are you reaching 12psi in first gear at 3500 rpm? this is pretty normal. in 3rd and up, you should hit 12psi a lot sooner. 2800rpm or 3000 or so.slugish? try shifting at 6500 rpm and check the timing.

to check timing, engine must be warm. shut off car. unplug tps, restart, set idle to 700rpm. set timing to 15 to 117 degrees advance. turn off car, re plug up the tps. go test drive.shaun

[Samabra]

If I'm right, you've hooked the downpipe up to the stock 240SX exhaust? Cause if so, then yes you are going to get some A)lag and B) Sluggeshness, because of backpressure. Save up and get a 3" exhaust (which is probably what your planning) Chris

[SrS13]

please explain that !! i dont quite under stand it !

also what is your timming set at !?!?

It feels like a loss in power as if its not picking up as qiuckly as I expected it too. My timing is set at 15 degrees the second motch from the right.

[SrS13]

are you reaching 12psi in first gear at 3500 rpm? this is pretty normal. in 3rd and up, you should hit 12psi a lot sooner. 2800rpm or 3000 or so.slugish? try shifting at 6500 rpm and check the timing.

to check timing, engine must be warm. shut off car. unplug tps, restart, set idle to 700rpm. set timing to 15 to 117 degrees advance. turn off car, re plug up the tps. go test drive.shaun

first gear I do not reach full boost second I do and so on and ur right I do hit 12psi before 3000.

I dont understand? I should set my timing from 15 to 117?? Do you mean 17 degress? would that be inbetween the the first two notches to the right or inbetween the 2nd and 3rd notch???

[SrS13]

Also before I forget I cannot keep my rpms up when I am reving before my launch.

For example: If I am reving up to 3000 when I launch my rpms will drop to like 2000. As soon as I step on the throttle and start to release the clutch my rpms drop. Am I doing something wrong or is there a problem with the car????

[S13240]

Slow reaction with your feet?

[pampadori]

17 would be between the two knotches on the right when looking at it. (on driver's side). when you let the clutch out to launch the rpms are going to drop. unless you spin the tires. i'm kinda confused. maybe you were expecting something more fromt he sr swap. but 250 hp is more then the ka, but you should only tell a difference from 3000 and up. maybe a loss under 3000. i'm confused...shaun

[SrS13]

when you let the clutch out to launch the rpms are going to drop. unless you spin the tires. i'm kinda confused. maybe you were expecting something more fromt he sr swap. but 250 hp is more then the ka, but you should only tell a difference from 3000 and up. maybe a loss under 3000. i'm confused...shaun

What causes that loss under 3000? is that what lag is?? would that also be because I am running almost no catback because the stock 240sx pipping is even conneted all the way???

Thanks for all the help

[SrS13]

Doesn't anybody know what causes that loss????

[harryhood]

lag is the slowness of the turbo to reach boost. generally the bigger the turbo the more lag is present. post your set up. if you have a T25 then you should be reaching full boost in all gears. that turbo has almost no lag

[Drakon]

What causes that loss under 3000? is that what lag is?? would that also be because I am running almost no catback because the stock 240sx pipping is even conneted all the way???

Thanks for all the help

OK! The loss....its very very simple. YOur holding the pedal just enought to hold the RPM's at 3000, then you let the clutch out and !!! Whats doing that is just simple strain on the engine from being at 3000 with no demand at all, then you let it out and it should drop because your engine slows down (Less Revolutions Per Minute) because it has to pull your fatass now. (j/k about the fatass ) THen it starts to climb again cause its speeding up. So dont worry its going to do that in anything.

[Drakon]

Also before I forget I cannot keep my rpms up when I am reving before my launch.

For example: If I am reving up to 3000 when I launch my rpms will drop to like 2000. As soon as I step on the throttle and start to release the clutch my rpms drop. Am I doing something wrong or is there a problem with the car????

ACtually this would be what i meant to quote. The answer was to this question but i think that other part was the same thing right?

And i dont think anyone gets it. DO you have the stock 240 exhaust? cause that will cause alot of slugish feeling like the other guys said because its drastically restricting the airflow out of ur engine.

[SrS13]

And i dont think anyone gets it. DO you have the stock 240 exhaust? cause that will cause alot of slugish feeling like the other guys said because its drastically restricting the airflow out of ur engine.

yes i ment to say my stock 240sx piping is not connected all the way it is halfway connected. But I feel that loss when I am not running a catback at all even more, when I am running open downpipe. Why is that???

Yes I am waiting on a Apexi Catback it should arrive within a week

[Drakon]

I duno guys is that just his turbo lag he's feelin? turbo lag is just the lack of turbo charged power while the turbine spools up. YOu will have the power your engine has minus the turbo boost untill the turbo spools up. You said you might be expecting more from the SR than you should. Thats possible, its not a monster or anything. It can be, but it might not have the power you were expecting. I duno. Hey go drive some of your friends cars that are non turbo or even stock eclipse turbo's or 1.8T's Your engine should be stronger than any of theirs and yu may feel their cars are slower. then get back in yours and you'll appreciate it more.

[SrS13]

I hope that lag is all Im feeling its just like I said I come from the quick high reving Honda world. I had a B16 powered Crx and felt to pick up quicker. But that was Once Upon a Time.

I'll get the Apexi exhaust bolted on soon though.

Thanks for your help Drakon

[Drakon]

That would make sense...your in a much heavier car compared to a crx so its not gona pick up as quick and easy. u should have more power than ur old car. thou

[SrS13]

yeah see thats the thing boosting up to 12psi I expected it to be faster than a b16 powered Crx but every noe and then when for fun I run a buddy of mine with it he beats me and we are both equal drivers. whats that about???

[toy turbo 2]

just sounds like its time to dump more money into your car. all the crx's with B16's are going to be really light and thus they'll take off better then a 2800lbs car that's turbocharged.

In my MR2 i'd get jumped by a lot of honda's off the line (that's not saying much when they have like 3lbs*ft of torque) but then it'd just reel them in extremely quickly (once i hit boost)

turbo's are a weird creature when you're not pushing very much power compared to N/A

[S14Life]

Seriously, can you re-read your post BEFORE you post it? It's really hard to understand what your saying sometimes. What kind of car does your friend have? You might be running slower because like you said, you don't have a 3" exhaust and the back preasure you get from the stock piping messes you up. Also JUST increasing the boost doesn't necessarily(sp?) mean faster or better.

[SrS13]

Sorry maybe I should pay more attention to what I write.

My friend has 1988 Crx with a B16A1 he has a Dc header a Apexi muffler, and an injen short ram intake.

and he gets me off the line and beats me I just dont feel my car take off at all. even when I am runnig open downpipe.

If boosting up does not mean faster or better then what does it mean???

[Drakon]

HEy you have a aftermarket fuel pump and stuff right? Cause upping the boost without the fuel flow increased isnt gona do much. I dont own a sr powered car yet so i cant tell ya what to do. maybe try and lighten your car some. and talk to one of these experts on how to get the best HP gains for your money. your car has the potential to be a monster (and thats where your better off than ur CRX and other honda friends) u just gotta have some money. Maybe do some searching around on the forum for how to get good HP gains. and get that exhaust of urs on. ur gona kill peoples ears going strait pipe!

BTW I am/was a honda guy so i know what your talking about. I still love honda and think they do make better cars, just not turbo powered cars. eneways goodluck

[sr20meplease]

to me it just sounds like your not launching underboost and your can isn't taking off as fast.....you gotta think...sr not under boost doesn't make 202(red top)but a b16 crx makes its hp off the line and alot faster....try to get your friend from a rolling start or something.

[Phax]

A free breathing, B16A1 powered CRX hatch is a quick little car. He has a wider powerband than the SR20DET, and a lot less weight to move. In the long run, you can make gobs and gobs more power than he can, for less money... but "stock vs stock", the B16A1 is a tough car to beat.

[SrS13]

just wondering would the type of spark plugs you have make a difference when your boosting above stock???

Sentra SER denso platnum spark plugs gap set at .028 and boosting to 12 psi sometimes. dont know the heat range of the plug though?

[SrS13]

anybody???????????????????????

[JESTER]

First off, what do you have done to your SR. Make a list for us. You may have a problem with back pressure, fuel system or something else.

I have to say that you are boosting 12 psi? You should not be getting beat by a CRX. Unless he has more than the exhaust and intake stuff done. Not bashing the CRX, but 12psi is a decent bit of boost.

My recommendation is have another SR owner near you drive it, and see what they think. It is too hard to try and tell you what it is with out actually being in the car and driving it.