zona10

Hi!
I'm from Spain Barcelona and I have a Nissan primera gt p11 with a sr20ve.
My setup is:
Nistune RT
Sr20ve
sr16ve n1 cams
valves +1mm intake +2mm exaust
Intake valves at 30º
bc springs h22
intake polished.
metal gasket
stock pistons
clutch ClutchMasters fx300
stock maf sr20de this maf can read 290 hp.
header 2"
line exhaust 2,5"
no cat.
compresion test: cold
252 psi
250 psi
260 psi
253 psi

My problem is than I don't know why my car don't push at slow rpm 2000 - 5000 I have power only at + 6000 rpm.
I did a test with a p10 EGT, 159 hp, and at low rpm is much faster than me and when run at high rpm we run at the same speed.
My engine cut at 8200 rpm and maf voltage at 8056 rpm is 4,68v, ingnition run at 35º and afr at 11.9-12.2.
I don't know what happend.
Any can help me?
Thanks!
Update with images

Yellow4g63

Your A/F ratio is too low for stock 2.0 pistons. lean it out to 13.0-13.3. Also double check the cam timing and ignition timing too. If u have cam gears just put them to zero,zero.

__________________
95 240sx The RB20 night stalker
91 NX2000 VE forsale
95 240sx stock and slow new daily
Protech-Fabrication
http://www.OSRdyno.com/

zona10

Hi! Thanks for answer so fast! The cams are at 0,0 and the timing is at 15º.
13-13,3 at WOT slow rpm? Or at WOT High rpm? because, when I run between 800 and 4600 I'm running at 13-13,5 thanks!

Yellow4g63

at low rpms your A/F should be jumping around 14.1-14.7. When you stomp on the gas the A/F should start to richen up more if u tune the map right. from say 5k to 8k try and get the A/F to 13.1-13.3. What I mean is that when your at WOT from 5k to 8k your looking for 13.1-13.3.

zona10

Ok I try it
thanks!!

zona10

Yesterday I went to the dyno. My engine output is: 139.4 kw at 6990 rpm and 201 n/m but I think that the engine have a problem because this power is just before 3 stage of vvl when the exhaust is activated the engine lose a lot of power and torque.
http://www.subirimagenes.com/fotos-d...e-6318236.html

Yellow4g63

Your out put isn't bad at all. your at 186whp which is in the normal range for N1 cams. You might want to change the maf, if its the old style de maf where it has a really small opening.

is yours like this?

THOR

the p11 gt comes with a maf that looks similar to the ve maf but with a different part#.... but i have seen it work.... [black plastic correct?] from what i can see u just need to have this thing tuned... i had similar #s to when i dropped in my n1 cams but tuning took me up plus angling the cams made the curve a bit fatter

__________________
Calum basic, N60 maf, N1 cams, Greddy mss, JWT cam gears, ssac 2.5" header, 3" exhaust, Vibrant oval pan, ES bushings, JWT popcharger, B15 stock clutch disc and A.C.T. HD pressure plate, 8.5 lbs Fidanza flywheel, gt-s tranny, Prothane E/Mounts, Vz-R front seats, TEIN HA coilovers 197whp/146wtq

zona10

Yes is made of black plastic probably 76 or 80 mm of diameter + o -.
Actually I have problems with the shims This can be a cause? also I think than the engine can be need more exhaust diameter is possible?
Thanks for yours answers!!

P11

have the same problem... no power up to 6.000rpm :-(
problem solved with bigger exhaust? actually diameter is around 48mm (1,9")...