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  1. kidturbo

    LLY: Oil Pressure Acting up

    Bad wording on my part, corrected it before you replied. ;) Agree I should probably dig up a true mechanical and port it in to be certain this isn't "ghost signals" from the wiring harness or something. As to your pressure relief valve point. She is spraying a little oil out on the...
  2. kidturbo

    LLY: Oil Pressure Acting up

    Dry sump would be nice, but realistically not in the budget. It doesn't do that much bouncing around to cause this type of starvation issue. Purely RPM related, all the logs match up. Not ruling out pumping the pan dry, but you'd think the windage tray would contain the splashing enough avoid...
  3. kidturbo

    LLY: Oil Pressure Acting up

    High RPM Pressure Bouncing Hi Guys, I have a similar oil pressure bouncing issue that I've logged with EFI. Posted it in another topic with no replies. So here is the screenshot of it again. This is a LLY in a boat, and I have several logs of the same bouncing on extended WOT runs. It...
  4. kidturbo

    fluctuating oil pressure

    Anyone seen this much pressure bouncing before? She wasn't completely starving cause I have 10 consecutive runs logged of it happening above 3400, and it's still running fine.. The analog gauge didn't show it [or I didn't catch it], but EFI tracked it on every run. She is spraying some oil...
  5. kidturbo

    A Little Top End Tuning Help Please

    Actually was clearing room for that new config earlier tonight. My primary running "DSP1 position" tune is fairly close to his setup. 1750us @ 160mpa and 26*. It's a very stable tune with good power up to about 3300R's and lower EGT's than the 2000us I've been running. The 2000us just pulled...
  6. kidturbo

    A Little Top End Tuning Help Please

    Thanks guys. I'll keep searching for a good 42xx. While waiting on a new T4 gasket to arrive in the mail to get a true drive pressure reading, I remapped my MAF B0201 table with the LBZ numbers. Made a good difference down low, she rolls coal again when spooling. Comparing past years logs, it...
  7. kidturbo

    A Little Top End Tuning Help Please

    The GTX is a nice unit, but not commonly found used. 3k isn't in the budget this month for a new one. GT4294's are out there, and fairly cheap. Figure I could about break even on my used 4094R. That 4202 looks pretty big compared to what I have now. Any experience with them? Since I'm limited...
  8. kidturbo

    A Little Top End Tuning Help Please

    Turbo Swap What's the consensus on replacing my 1.06 A/R 4094R with a 1.28 4294? It has a similar compressor map to the 40 with the same T4 base, but better CFM air flow on the exhaust side. Uses 4" exit vs the 3" I have now. Would be giving up the water cooling and ball bearings, but maybe...
  9. kidturbo

    A Little Top End Tuning Help Please

    Hit a snag with testings last weekend. The shifter linkage in the outdrive snapped a bolt and got stuck in FWD. So took it easy until I made it back home Sunday. Attempting to fix that issue today. Did see it hit 3750 on the digital tach in a race against a twin 454 engine boat last Friday...
  10. kidturbo

    A Little Top End Tuning Help Please

    LOL.... Finally someone I know who is turning 4k. Gotta agree it should take more air if I force feed it. Would ya happen to have a big GT4 laying around I could borrow for a weekend?? Thing pulls from 2600-3600 in like 4 seconds, then it's just like ya hit a rev limiter, without the bouncing...
  11. kidturbo

    A Little Top End Tuning Help Please

    Heads have not been ported. Ya think they could be a restriction? It feels like it could pull more, but is just out of air flow or camshaft at that RPM. Reason I'm looking for someone who is turning 4k plus to chime in. The drag on a boat would be about equal to pulling a 6000lb trailer up a...
  12. kidturbo

    A Little Top End Tuning Help Please

    It's a stock LLY pump, only mod is larger fuel inlet fitting which makes no difference in my view. Gonna mod the regulator and mechanical lift pump when I get time to see if it helps hold pressure up top. For now looks like I'll concentrate on getting the water/methanol injection on it to...
  13. kidturbo

    A Little Top End Tuning Help Please

    After a couple runs today on the other prop I noticed a couple things. First going with the lower pitch didn't help with rev's. Still peaked out at 3600 R's. However with this prop logging showed actual fuel pressure started dropping off faster after a couple seconds at WOT on the 2000us PW...
  14. kidturbo

    A Little Top End Tuning Help Please

    Yeah it's all about the max revs and power range vs prop pitch. Lowering the pitch # moves the power range up in the revs, but lowers the potential top speed by engine red line. Much like axle ratio's, 35 pitch would be somewhere around 3.27's, was a 37 pitch in the data log above. Airplane...
  15. kidturbo

    A Little Top End Tuning Help Please

    I'd tend to agree with ya here. The original data in dsp3 position I replaced was 28deg max and 2900us @ 150mpa. Nick had written this tune based on 50hp not 50% injectors [my bad], we considered that dsp slot to be off limits with these larger injectors. The 26 and 2000us tune slot runs sweeeet...
  16. kidturbo

    A Little Top End Tuning Help Please

    Hi guys got the LLY back in our boat and she is hauling A$$ again. Now trying to break 100mph without smoking the new pistons. But I've hit a wall now around 3600rpm, or 85mph and could use some advice on timing and PW values. The current fuel system build is a single CP3 with 50% over...
  17. kidturbo

    My turn to crack a piston

    I've managed to clock 28 hours run time on the boat motor now without cracking one of the new design [lower CR and polished bowl] cast Mahle's.. :D However those who read my piston experiences know the failures with stocker's was a mix of extreme heat fatigue and lack of oil cooling supply. So...
  18. kidturbo

    Piston Coating ?

    Thanks guys. After looking at some other comments on how the coatings perform under high temps, not positive it's the best choice either. She sees 1400+ sustained sometimes for a few minutes, so its kinda which is going to last longer piston or the coating... Plus the bowl design is greatly...
  19. kidturbo

    Piston Coating ?

    My birthday arrived a day early. Mahle Cast 16.5 CR +020 After much research and procrastination I finally settled on the Mahle cast pistons over the forged Aries for my marine LLY application. Cast were still more $$ than the forged option [go figure], but waiting paid off since they...
  20. kidturbo

    Duramax Harness

    Agree with the Alldata supbcription.. Well with the little cash for details ya get. If anyone's interested I am looking to upgrade my 05 standalone harness to an 06. Was done by PPE while back, would trade ECM, FICM, and harness for a stock 06 harness. -K
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