Technical > Spud Miller's Cave
jet change for nitro
wideopen231:
Spud,
Running FI with 6.7 gpm DSR pump..036(4 outer cylindernozzles ).038( four inner cyliders)normally around 125 to 135 bypass. Looking at adding some fun juice after combo is tuned out. Max laod 30% and more like 20% if keep tuner under control.Seeing as thats me I know thats not easy.
How much jet change for 20 and 30% loads.Also timing adjustment suggestion running msd mag 20 and if need have dual drive and two mags,doubtful but do have them.34 to 38 with alky.
Oh yea 526 tfx HEMI 12,5:1. OLD ALKY COMBO WITH CAM CHANGE.
Spud Miller:
I assume you're naturally aspirated, not supercharged?
For 20-30%, the main pill would be the same. Only after 33% is there a need for a smaller pill.
Just for the heck of it, I'd richen it one step and knock back the timing about 4 degrees for the first pass or two. If things look ok, lean it back to where you were on the pill. If things still look ok, put some of the timing back in. Unless your compression ration is crazy high (14:1+) I'd guess you'll end up back at your original tuneup for methanol but be going quicker. You'll have higher system pressure from the nitro too.
No need for two mags.
Have fun!
Spud
wideopen231:
Thanks Spud. Yes NA motor. Will start with 25% and .010 rich and step up from there. Not going to be running full time,just need game plan for those need to be bit quicker times .
Spud Miller:
You might find .010 rich will cancel out any gains from the nitro. That's a 15% difference in area. Be ready to lean it down to go quicker. If you can do some testing before race day, you'll know exactly what to do and what it likes...and how much you'll gain.
Good luck!
Spud
wideopen231:
Teating with this to have raceday info is idea. Going to start out little rich step up 1 change at a time to get data as to which change has what effect and record for referance at later date. Mainly looking for good starting point and from what you have said basic tuneup should be real close can tweak from there. Thanks
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