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| mattymc |
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Hi all,
Just putting this one out there to see if anyone has any idea's as to what might be going on. Here are a list of mods. Pacemaker 4499's. 2.5 inch mandrel bent exhaust. Thermos El Ecu and J3 with advanced timing BBM Gas Research Throttle Body 480 3 inch intake ef airbox with high flow filter Ported and shaved head with xr6 valves Wade 1673 Adjustable Vernier Manual Have checked pretty much everything. Has plenty of fuel, base timing is correct. Cam is dialed in correctly. I have even tried different tunes in the ecu which had minimal effect on power (dropped about 5kw with standard xr6 tune). Unless I have been supplied a 1636 by mistake I'm really scratching my head to find out what is going on with this car. Dyno sheets are below. Sorry about the quality but had to take them on my phone as I dont have a scanner atm.  Cheers Matthew |
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| 87SIlude |
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Checked for vaccume leaks.
Is the engine running well, using a normal amount of fuel. |
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| mattymc |
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Yes checked for vac leaks. Engine is actually running really well smooth idle, no knocks, dosent use oil or coolent fuel use is good too.
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| TROYMAN |
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what power were you expecting??
what was the power before?? ive seen some engines with similar cams only pull 120 rwkw and ive seen other engines that were std pull 130rwkw.. it all comes down to the base engine started with, some engines are what we call freaks and others are just avarage and also some dyno's read lower than others.. |
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| dazza027 |
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Put the timing back to where it was before the EL computer was in it. When I did the BBM and EL Ecu conversion with the thermo fans etc, I didnt touch the timing at all and mine goes like the powers of piss.
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| mattymc |
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To be honest Troy I was hoping for around the 150's. I have not run the car on the dyno before the mods unfortunately circimstances prevented that. I know what you are saying about average and freak motors.
As for the base timing. I would think it would ping its head off with an extra 10 degrees in ignition. I have had the timing up and it went very well but would ping too much so I decided it would not be overly reliable. |
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| Shortshift |
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Is your BBM switching at 3800rpm? I had a similar situation happen when my car was on the dyno. The vacuum hose to the switch the runners wasn't hooked up properly when I installed the engine.
_________________ AU2 XR8 with Raptor VL, ported Yella Terra GT40P heads, Scorpion 1.6 RRs, XE264HR-14 Comp Cam, ceramic coated Hurricane Headers, 60lb injectors, Walbro 255, 200cfi cats, 3" exhaust & Snow Performance water methanol injection |
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| mattymc |
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I was thinking it could be a BBM issue as the curve really dips and goes nowhere. Ill double check that when I get a chance.
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| phongus |
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From your list of mods, I'd be expecting 140rwkw...or more.
Maybe exhaust system may be restricted.
_________________ phongus = Post whore 2006 |
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| mattymc |
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I have checked the cat which is the only thing I could see holding it back exhaust wise but all was good.
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| Greenmachine |
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When you say "base timing is correct" - exactly how and where is that set to?
I was the same as dazza027 with my ED + EL ECU etc. - ie. I ended up running it with the dizzy at the same position as when the ED ECU was in it. Setting it to the ED timing cover's TDC mark in diagnostic mode with a timing light - which was what I THOUGHT was the correct procedure for the EL ECU - resulted in really dead performance... Frustratingly and as strange as it sounds I can't remember (getting old I guess) whether that was actually to the 10 degree mark in diagnostic mode or whether I just used the physical position marking I had made on the dizzy when it had the ED ECU in it. Also the manifold not switching from long to short at 3800rpm will absolutely make a HUGE difference.
_________________ Sold the Greenmachine - now driving 2015 Jeep Cherokee Trailhawk. |
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| tickford_6 |
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Posts: 6449 Joined: 11th Nov 2004 |
Borrow a stock throttle body from some one and take the GRA one off.
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| efxr6wagon |
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It appears that the BBM is working correctly, as the dynoplot shows the little dip at about 4000rpm that you normally get on transition from long to short runners.
I don't understand why the dynoplot stops at 5000rpm. Would it show more power if the run had extended to redline? With that cam and those mods, your power should be peaking at about 5500rpm. My EF with similar mods (milder cam and no porting, but no cat) peaked at 148 rwkw at 5200-5350rpm BEFORE the J3 chip and with AFR of 11.9 (rich) at that RPM. I know numbers vary dyno to dyno, but I would have expected you to show at least 140-145, and possibly over 150 rwkw at about 5500rpm. And mine is through an automatic, while yours is manual, which transmits more of the power to the wheels, so yours should show a better rwkw. Are you using the AU MLS head gasket (extra compression)? Did they measure AFR? Is your O2 sensor stuffed, so over-fuelling via the fuel trims? Otherwise, it makes no sense. That looks to be a stout, well-balanced street setup.
_________________ 95 EF XR6 wagon, 17" FTRs, DBA rotors, KYB/Koni, AU bottom end, ported EF head, backcut valves, SS Inductions, Territory intake, 10.2 CR, Auckland 1258 cam, vernier gear, PH4480 headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip |
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| Greenmachine |
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I saw those dips - and actually took them as a possible sign the BBM wasn't working - ie. engine not doing what the ECU expected at that point (to me the graph lines fall back a bit and then resume). But if it's been physically confirmed as switching then it's working...
Like we said - the base timing needs to be same as it was for the ED ECU - if it's been set up differently then that's probably the issue right there.
_________________ Sold the Greenmachine - now driving 2015 Jeep Cherokee Trailhawk. |
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| shyun |
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Greenmachine wrote: I saw those dips - and actually took them as a possible sign the BBM wasn't working - ie. engine not doing what the ECU expected at that point (to me the graph lines fall back a bit and then resume). But if it's been physically confirmed as switching then it's working... Like we said - the base timing needs to be same as it was for the ED ECU - if it's been set up differently then that's probably the issue right there. Why should he have 10deg BTDC when an el ecu has timing set to run at 0?? Since you have a chip though you can just add more timing on that though and see if it makes a difference.
_________________ ED XR6, LeMans Red, 5-Speed |
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