New Time in My LX9 Beretta.

[LX9Power]

Hi

here is my best time of Last night:

0.122 reaction
2.360 60foot
6.336 330 foot
9.632 1/8 ET
75.13 1/8 MPH
0.000 1000 foot
14.803 1/4mile ET
96.60 M.P.H.

On my beretta with a 3500, 65MM throttle body (WOT-TECH), Headers and a Semi- tune by myself

I think my injector a maxing out at 19.xxx MV. they are 1997 venture injectors...I got some L67 injector here that I think I should install.somebody know what is the Fuel pressure of a Beretta 1996? I need that so I can change my injectors.

[robertisaar]

factory fuel pressure is 43.5PSI with the vacuum regulator disconnected or otherwise exposed to atmospheric pressure.

[SappySE107]

43.5 with the vac line on and at idle. Unplugged/WOT, it is about 49 psi. 43.5 is what you are looking for though. The L67 injectors are massive overkill for your engine, but that shouldn't be an issue

[LX9Power]

they are too much for my engine? how much max power they are rated at 43.5 psi?

[Superdave]

@ 43.5 PSI they're around 32 lb/hr. That's enough for 300 HP @ the crank.

[LX9Power]

@ 43.5 PSI they're around 32 lb/hr. That's enough for 300 HP @ the crank.

thanks superdave, where do you think my setup stands as of right now?

[3400-95-Modified]

What does your car weigh? Going off what mine did as a "base" per say, (3045lbs with me and 1/2 tank of gas)

that would put your engine at approximately 200chp

Thats seems quite accurate too if you really look at it, since the LX9 is rated at 196hp to 201hp

http://www.dragtimes.com/horsepower-et-trap-speed-calculator.php?et=14.803&trap=96.60&weight=3045&submitButtonName=Calculate+Horsepower+Estimate

[LX9Power]

weight I don't know but that seems accurate. So i got a 100HP marging with these injectors.... okay thanks for you help everyone.

[3400-95-Modified]

Remember though, too large of an injector will cause other running issues.

Use this.

http://www.witchhunter.com/injectorcalc1.php4

Funny thing is, for 220 chp that website says 22.9lb/hr is sufficient so I would say go with 28's... resell the 32's since they may make part throttle driving/running not good.

And yes 300HP is suggesting a 31.2 injector.

[Superdave]

I figured about 240-250 on his combo at the crank, i agree that 28's would be plenty.


tuning for 32's/36's isn't that bad but it will take a while to get the idle worked out right, i did that for 2 cammed 3500's locally and both ran great after a few tuning sessions. Both were at around 290-300 CHP though.

[3400-95-Modified]

I figured about 240-250 on his combo at the crank,

I've seen quite a few numbers thrown around lately that seem quite gracious when it comes to CHP numbers... I don't mean anything against you Dave, but 240-250chp on a 100% completely stock 3500? that seems like a bit of a stretch to me. Even with the headers; I honestly don't think they add that much, and his tune could quite possibly be just a bit shy of a 3500 tune so what he's loosing there he gained with the headers.

What do you have done to the tune? and what ECU are you using? Are you running any 3500 tables in the current bin?

[LX9Power]

its got a venture ecu with a semi-tuning. DHP pwrtuner and running a modified 3400 spark table. I just cant seem to get the injectors in check...they go really rich through my Wot( drag strip)

I'm not running a 3500 as I don't know someone who actually cracked the 3500 bin.

well If your saying I might have some idle issues...I will trade them with soemone.

[SappySE107]

You won't have idle issues with tuning and there is absolutely no reason to use 3500 tables. Tune it for what it wants, and thats it. It goes rich at WOT because it either needs tuning, or the injectors are static and you are dealing with physical limitations.

[3400-95-Modified]

I started with some 3500 tables as a baseline, that was my point... The spark table is a bit more agressive than a stock 3400 table so unless he's reached what the 3500 has stock he may still be behind the bus, thats all I'm trying to say. Yes in the end tune it for what it wants but you need to start somewhere and starting with a 3400 file is just a bit behind and will take a bit of catch up.

What is your IFR set for? and have you scaled the MAF table at all to get that in check with what a Wideband is reading vs what the ECU is commanding?

If your going too rich at WOT top end then your might only be hitting your 100% duty cycle because of some table being set wrong and the ECU thinking the injectors are smaller than what they are OR the MAF thinks way more air is entering the engine than what really is.

With Roberts engine I was hitting 12.3 a/f at the top end, and I was able to drop it down to 13.0 at one time to see if it was too rich, that didnt work power wise, and then i brought it back up, but when getting the 12.3 a/f above 6k the injectors were maxed out and hitting 100% duty cycle or more, so his I know we reached a physical limitation of the injectors.

[Superdave]

I've seen quite a few numbers thrown around lately that seem quite gracious when it comes to CHP numbers... I don't mean anything against you Dave, but 240-250chp on a 100% completely stock 3500? that seems like a bit of a stretch to me. Even with the headers; I honestly don't think they add that much, and his tune could quite possibly be just a bit shy of a 3500 tune so what he's loosing there he gained with the headers.

3000lb car trapping 96.6 MPH is showing around 200 WHP, auto trans is roughly 20% loss (40 HP). that's where i came up with 240 ish HP @ the crank. The math is just an estimate of course, also not taking into account for the drivers weight.


I've seen some pretty good results from 3500's in the past, As much as people like to discount them they do make tons of power with just a few supporting mods and a good tune. Mine was ~2900 lbs trapping 108 with just the cam, headers and porting.