maddcrx

Hi, I'm new at this.
I just wanted a baseline on the timing more or less what it should be.
I have a CRX LS/Vtec setup with eagle rods/ wiseco low compression pistons/ 81 mm stock sleeves / 720 cc injectors / arp head studs / oem HG / turbonetis 60-1.
What should the timing be on idle and what should it be at full throttle 25 psi of boost. I will use the aem ems fuel and ignition.
I wanted to know more or less, just to compare to what my tuner is doing.
Any help??

tony413

base timing on a B-series is 16* the rest of your questions is relative to your set-up and what your tuner feels is confident.

maddcrx

I understand, but let's say I'm running 20 psi of boost. What should the timing be at full boost??

tony413

you can only get approximations every motor is different

maddcrx

What approximations can you say??

champLSinteg

Are you trying to do this on pump gas?

maddcrx

Yes, actually on both. Pump gas for the street and racing fuel for the track!

VtecCarHauler

my timing was at 13 on 93 pump gas from full boost to redline.

LastGenEK

My GSR with 8.8CR and scat rods (the rest stock)
T3/T04e 57trim 63ar 10psi
780cc's,s300,
91 octane

I think I see 18* at Full throttle
16* base timing at idel

DOHC_16v

I don't have any experience with B series motors, but I generally tune between 15-20* on pump gas at 15-20psi. It depends on many factors such as compression ratio, turbo size, thermal efficiency of the intercooler, how prone the engine is to pinging, gas quality, etc. For a conservative baseline pump gas, I would start with 25-30* before boost and ramp it down to 20-23* at 10psi, ~17-18 at 15psi, 15 at 20+ psi. Then tune the AFRs, a bit on the rich side and add some timing to see how the engine reacts to it. On the dyno you can listen for knock(easier than on the street) and see how far you can go on timing, and you can also see how the extra timing affects the power. Also a lot of engines tend to be more prone to pinging in the mid range, as the car gets to full boost, and you can usually add more timing towards redline.

champLSinteg

I am running 15* on 91oct @15psi and 19* on 112oct @ 20psi. I checked the plugs after each pull and thats where they looked good. Big horsepower V8 drag cars tune at the track by looking at the plugs. They can tell you ALOT!

LS_VTECteggy

quick question I just finished my turbo install on my ls/vtec and I need to time it on the cams, currently have the stock pr3 cams gsr head and it bogs every time I push the throttle about 20%

ashb82

you set the timing on the distributer 16* with a timing light. What kind of ecu you got

LS_VTECteggy

I have an obd2a ecu running with AEM FIC, so ill tell my friend that is coming over to 16*. Wired everything up right but it will lean out as soon as I give it 20% throttle any other ideas incase the 16* isn't gonna work?

ashb82

you got a wideband. have u tried adding fuel where it gets lean

LS_VTECteggy

my injectors are running 99% and yet its leaning out...

lsvtecracer

What kind of injectors do you have?? I usually don't run the injectors past 85% duty cycle. Sounds like your injectors are too small and you need to go bigger.

Steve

LS_VTECteggy

450cc dsm injectors

csxdog

iTrader: (1)

I know it's an old forum, but just in case anyone else is searching... I'd check my fuel pressure in that situation... Looks like your injectors are wide open but no fuel is flowing through them.

wantboost

iTrader: (2)

Dude seriously?

You live in my town too. Don't make me find you and slap you lol.