so i just got back my 1990 240sx with a nice s13 redtop sr20det. The engine runs very well, it produces good boost and pulls pretty hard. However I have a few problems with the car that i do not know how to fix.
1- my heater fan does not work. The shop hooked up all the heating tubes, and it worked for a little bit the night i got it, but does not work anymore.

2- It idles pretty bad when warming up. It runs very lumpy, and then slowly dies. Once the car is warmed up it idles fine. I do have aftermarket cams that came in the engine when i got it so i think that might have something to do with poor idle.

Those are about it. If anyone has any ideas i'd love to hear them

Ill be posting pics pf the car as soon as it stops snowing..

Oh also i am running about 15psi, is this a safe psi to be running the turbo at??


1990 240sx hatchback
sr20det redtop motor
greddy FMIC
greddy 3' down pipe
apexi n1 catcback exhaust 3'
ATC street clutch
3' test pipe
HKS cams
HKS turbo timer
25cc walbro fuel pump
HKS intake
l

 

i would turn down the boost. with a t25 you shouldnt boost like that all the time.

 

Damn...turn the boost to like 10-11 man. 15 is the turbos limit..im surprised it survived how long it has ahha.

 

Yeah, I'd go with more like 12-13. It can handle 15, but that is the highest I would EVER go.

 

thanks for the tips on the boost level, but what i am really concerned with is the problems with the cars idle...

 

what profile cams are those? the best idle/performance i've seen are coming from step 1 264 cams

 

im not sure of the profile, becuase the cams came aldready in the engine, it was a nice surprise to see that i got a set of hks cams for free. the cars is running at about 280hp to the rear wheels and over 300 ayt the crank.

 

lol a STOCK t25 and 280 whp?...

u need to run stock boost 7 psi and if you're racing dont run more than 14

u'r lucking if you're getting 240whp

 

i dynoed the car at 280 thanks for you opinion though.

 

now the car's idle is running very high....im confused

 

Really weird...

 

higher performance cams change the idle speed and quality of the idle..

 

alright thanks, its wierd because at first it was idleing low and ruff, now it feels like its idleing around 2500-3000 (i cant tell because i have no tach). it does not do it all the time.

 

did u try to adjust the timing itself.. getting some adjustable cams? some adv/retard timing might be needed with aggressive cams, to make the car idle better.
Also a high rpm idle could also be a simple throttle cable problem. Did u check for any leaks? what happens when you tap the pedal as it is super high in rpm? Does it go down below the 3k?

Btw can u take a few pics of the beast.. I'm really curious to see some of the work