Just ordered mspnp
05-23-2008, 07:23 PM
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Just ordered mspnp
Ok so i just ordered MS w/ wide band and IAT Sensor Kit, and am now wondering about injectors. Right now i have the 305 injectors and was wondering if anyone has tryed to keep those injectors w/ the vortech presure raiser and ms, Insted of buying larger injectors. my goal is 250whp. I have a buget and need to know if i have to fit injectors in there or not.
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05-23-2008, 09:20 PM
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OK i think ill just get the injectors. Thanks is there anything elce i should get? Do i need 550's or are the 460's good for what im trying to do?
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05-24-2008, 01:38 AM
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With my 465 injectors, I get nice, smooth AFRs with 13-14 PSI on a little TD04H-15G turbo, with <85% DC, however I've never dyno'd the car and so quite honestly I have no idea what WHP this equates to.
There's a nice little injector calculator that you can play with here: http://www.rceng.com/technical.aspx#...tor_Worksheet_
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05-24-2008, 12:09 PM
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I'm in similar shoes to yours - bought MSPNP about a month ago and installed it with the vortech and 1.6 injectors for the time being. I'll give you a bit of info I've found to reinforce the 'get bigger injectors' suggestion.
For the 6 psi that the car runs at at the moment, the vortech can supply the fuel for it but in datalogs I've noticed that even with a very smooth fuel table, no adverse enrichments kicking in, etc. The AFR still bounces around within about a 0.6:1 range. I imagine this is because the smaller injectors are having so much fuel pushed through them that an extrememly steady flow rate is nearly impossible.
I have 460's at injector rehab right now. When they get back I'm installing them. I expect that with correct fuel tuning with injectors that can correctly flow the necessary fuel, one can get the fuel curve to be very smooth. The higher boost and more aggressive timing you are running the more crucial this is. I remember reading Savington saying once that he would be pinging if his AFR was fluctuating as much as the guy's he was talking to - iirc that guy had ~0.5:1 dips and spikes in his AFR.
So, for your car, the 302's may mathematically be able to supply enough fuel for your goals when you factor in the high fuel pressure, but in my experience a band aid fuel pressure riser doesn't seem to be able supply as steady of a AFR and at 250 whp, that could mean a quick death to the motor.
my 0.02
-Ryan
For the 6 psi that the car runs at at the moment, the vortech can supply the fuel for it but in datalogs I've noticed that even with a very smooth fuel table, no adverse enrichments kicking in, etc. The AFR still bounces around within about a 0.6:1 range. I imagine this is because the smaller injectors are having so much fuel pushed through them that an extrememly steady flow rate is nearly impossible.
I have 460's at injector rehab right now. When they get back I'm installing them. I expect that with correct fuel tuning with injectors that can correctly flow the necessary fuel, one can get the fuel curve to be very smooth. The higher boost and more aggressive timing you are running the more crucial this is. I remember reading Savington saying once that he would be pinging if his AFR was fluctuating as much as the guy's he was talking to - iirc that guy had ~0.5:1 dips and spikes in his AFR.
So, for your car, the 302's may mathematically be able to supply enough fuel for your goals when you factor in the high fuel pressure, but in my experience a band aid fuel pressure riser doesn't seem to be able supply as steady of a AFR and at 250 whp, that could mean a quick death to the motor.
my 0.02
-Ryan
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05-24-2008, 05:37 PM
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No i got new ones from auto parts store. I figured new is better than old ones that need to be cleaned, may be not possible to clean bad injectors from ebay or some guy. They came with a 7 year 70,000 mile warrante.
Last edited by Gotpsi?; 05-24-2008 at 06:13 PM.
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