Running totally lean after 5500rpm

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10-16-2008, 11:42 PM

#41

Smith-02

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Join Date: Apr 2006

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Re: Running totally lean after 5500rpm

if your tuner can't tell that the injectors need a resistor box, you need a better tuner.

10-16-2008, 11:51 PM

#42

Tom-Guy

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Join Date: Feb 2003

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Re: Running totally lean after 5500rpm

Quote:

Originally Posted by Adam Hopkins

Since we are on the topic of resistors and injectors, Let me throw this out there real quick. A customer brought me a 240 with a 1JZ. Car ran fine on 10psi with stock injectors, Now he has put in 750cc and the car will not act right. I am having to run somewhere around 13.0 a/f to get the thing to idle with no misfires. I then find out he was sent peak and hold injectors instead of saturated and has run these with no resistors. Are these things paper weights now? We put resistors inline now and it is still not wanting to act right. Is there any way to test myself or do I need to send them off? Thanks

What are you tuning it on?

10-17-2008, 12:11 AM

#43

HMTdmc

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Posts: n/a

Re: Running totally lean after 5500rpm

Quote:

Originally Posted by Adam Hopkins

I'd say just put a screw driver to them and listen if their still clicking the injectors are probably fine..Check the drivers in the ecu and see if they look overheated. or the board around them looks all melted.
Usaully when I run into problems like your saying missfires at idle and you can't lean it out to a 15.1 or more without missfires it's usaully Ignition related. Check the plugs wires. And check to se if it's in base time. just my $0.02

10-17-2008, 12:48 AM

#44

Adam Hopkins

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Join Date: Dec 2007

Posts: 217

Re: Running totally lean after 5500rpm

Quote:

Originally Posted by Joseph Davis

What are you tuning it on?

It is a stock ecu + map ecu. I have heard, and please correct me if I am wrong, Toyota has really good timing tables on the factory ecu with the 1jz and 2jz motors. There are a couple of guys around here making 450+ on stock timing map with just a Map ecu and bigger injectors. I have even read a couple of reports of 600 With just injectors and a map ecu.

Quote:

Originally Posted by c0mpl3x

if your tuner can't tell that the injectors need a resistor box, you need a better tuner.

No, you miss understood me. I am the tuner. The car was brought to me in this manner. I was the one that ohmed out the injectors and noticed they were peak and hold. The owner of the car was accidentally sent (or bought) the wrong injectors. I noticed no resistor box and put some inline just to get me by to diagnose.

Quote:

Originally Posted by Dmc1

II have tried it with 2 other ecu's. The car is coil on plug, I have tried a known set of working coils. But it still wants to break up. Maybe the Ignitor? I have BKR7E plugs gapped to .026.

10-17-2008, 01:20 AM

#45

Tom-Guy

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Join Date: Feb 2003

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Re: Running totally lean after 5500rpm

Quote:

Originally Posted by Adam Hopkins

I can't help with specifics. The only MAP-ECU II equipped vehicles I've dealt with were either wrecked before i could tune them, or were on a B-series Honda (wtf??) and I cut it out and threw it across the guy's yard. Zero experience, although I have the software installed on one of my laptops, might have looked at it for 5 minutes.

A local guy made 450 whp on a "heartbreaker" Mustang dyno with a stock 7M and MAP-ECU II, stock down to the factory headgasket. Keep in mind this is the Mustang dyno that said Goforth's CRX made 411, then he went to Pinks and netted consecutive 10.5-10.6 @ 146-148, so that 7M was pounding out an easy 525 in Dynojetland. Sure seems like they work very well, at least in some (Toyota) cases.

10-17-2008, 11:31 AM

#46

Adam Hopkins

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Join Date: Dec 2007

Posts: 217

Re: Running totally lean after 5500rpm

Good, Thats what I thought. Have you ever looked at what you can get a whole 1jz swap for, They are cheap compared to the potential horsepower of a stock motor. You can get a whole swap for around $1500-2000. And their trannys are supposed to be good until somewhere around the 750hp mark.

10-17-2008, 12:31 PM

#47

Tom-Guy

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Join Date: Feb 2003

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Re: Running totally lean after 5500rpm

I'd rather have a 1/2UZFE.

10-20-2008, 06:22 PM

#48

Hitchhikkr

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Join Date: Oct 2006

Posts: 2,330

Re: Running totally lean after 5500rpm

Quote:

Originally Posted by Joseph Davis

A local guy made 450 whp on a "heartbreaker" Mustang dyno with a stock 7M and MAP-ECU II, stock down to the factory headgasket. Keep in mind this is the Mustang dyno that said Goforth's CRX made 411, then he went to Pinks and netted consecutive 10.5-10.6 @ 146-148, so that 7M was pounding out an easy 525 in Dynojetland. Sure seems like they work very well, at least in some (Toyota) cases.

Dustin did 450whp with the map ecu 1, no timing control at all, running rich as ---- on the top, and not spooling till 4500.