Unfortunately, that will take an investment.
He will have to get a wide band O2 sensor and have a bung for it welded into his exhaust system before the CAT.
The Lambda Boy's sensor is too frail for the very high EGTs of the Renesis, so an LM-1 at $350 plus whatever a muffler shop will charge to do the welding (probably about $60) is going to be the cheapest way to do that.

Welcome to the world of engine tuning.:D

 

The problem with piggy back computer is that it modifies the signal coming into the ECU by a ratio and then send it back to the ECU. The final value depends on the map of the ECU.

If the map in the ECU is not the same as what the piggy back is programmed for, you are going to have problems.

What you hear is detonation and a few of those will mean death of your engine.

If you are a new rotary owner, go onto the rx7club.com and learn more about the biggest enemy of rotary engine: Detonation.

It's possible the "L" reflash already has a leaner map to increase mileage and HP. Better mileage means leaner a/f mixture. If you use a piggy back computer to lean it some more, detonation can be expected.

I hope your engine is ok.

Chuck Huang

 

So I guess this means your nitrous install is going to be put on hold?

 

Yes, at this point, I'm hesitant to do anything. After posting these events last night, I took it for a late drive. I hammered on it in various gears and rpm ranges, and everything is fine with no Stage 1.1 installed. The car ran perfectly, no noises, no power loss. Thank God...

 

Glad to hear your car is better..

Have you heard from CZ at all yet? I'm curious to see a reply from him. I was just about to send my CZ 1 for replacement.

 

Yeah, he e-mailed me last night. He asked for my VIN# and asked what gas I was running. He was very understanding of my frustration and he is having me send back the unit for a full refund.

ECU tuning is a delicate procedure, obviously, and the Stage 1 eventually will be right. After further research and fine tuning (possibly different tuning for different altitudes) it should be fine. However, I'm just gonna stay stock for now.

 

Mdw3333, If you are in Ohio, are you really at sea level? I would guess you are maybe around 800-1000 ft above?

Not sure if that is enough difference to worry about since canzoomer is much higher, 3000 ft or so?

Rotary Extreme, I thought the piggyback unit used its own map and did NOT modify the mazda map. Early on we asked if new flashes would have any effect/problems and Canzoomer said no, for this reason.

 

Canzoomer told you he was considering different setups for different altitudes?? I hope he didn't tell you that!

 

Piggyback does not come with maps with fixed value. That's why it's called piggy back. Piggy back the stock ecu map.

If it comes with its own map with fixed value, it will be a standalone ECU such as Haltech, Motec, PFC, etc.

Chuck Huang

 

No, he didn't tell me that, but that's what it might come down to.

 

Hey, I just checked with Fed Ex and my unit is to be delivered today. Don't know if I will have time to get it on tonight after work but I darn sure will try. I really would like to see the results before I have to leave for the week. and I know it may help settle some nerves if mine works ok. If it doesn't?

I am pretty much at the same altitude as Mdw3333 so it will be interesting.

I will post results asap. If I don't get it on, I'll also let you know.

 

I thought the lower you are, the richer the mixture is? or is that the richer it needs to be.

 

I'm at sea level, had my car upgraded to L yesterday and my 1.1 should be here any minute now. As soon as it's here I'll throw it in and go for a drive, but so far the car hasnt done any odd noises. Only drove it about 70 miles on the L map so far.

 

Im in florida, is this see levil?

 

My car was fine before the L map, and fine after it. This detonation (in my car) is definitly related to the Stage 1.1. No doubt about it.

 

OK, put in the stage1.1 and tested it real quick with no problems at all. Very hard to notice the stage1 since the powerband has been smoothed out considerably, but the car is way quicker than before.

IMO, much better than the surge from before in regards to driving feel as I prefer smooth over peaky. Got some driving to do today for work, but I will hopefully get the gtech runs in either tonight or tomorrow.

 

So it looks like a problem with only one Stage 1.1 and "L" flash combination and we don't know what the exact problem is yet right?

Vince

 

PLEASE READ !!

DETONATION AND/OR PRE-IGNITION WILL NOT CAUSE IMMEDIATE, IRREPARABLE DAMAGE TO YOUR CAR!
REPEAT WILL NOT!
While detonation isn't good for your motor, all of that doom and gloom is mostly reserved for those with a turbocharged B13.
If you detect detonation or pre-ignition, immediately release the throttle and allow the car to coast for a second or two in gear.
Approach the conditions that led to the noise with caution in the future, but understand that it will not be like a bomb going off inside the Renesis.

 

and for those that said the car didn't light the cel - the car does not always light the cel but it will store a code. when you have some time take it to the dealer and ask them to look for codes. tell them the cel lit and went out or something. also they can run diagnostics to comfirm a/f and other items. they did to mine yesterday as a way to show me that i didn't need a relash. everything was operating within normal parameters and i had no codes stored.

 

Genom has the L flash, and 1.1 as do some other people. The problem is not consistent across the board..

Genom, do you have an upgraded exhaust? I I have the borla, stock intake and l flash and are about to send my Stage I in for replacement.

 

Very good point, my car didnt light a CEL but I did have an O2 sensor problem.

 

Is this with or without the "L" flash?

 

Just curious could the problem be with the green filter?

It seems that the Renesis doesn't like aftermarket intake mods.

 

Sorry. Boy, this is a fast-moving board!

 

yeah the maf is very sensitive and intakes and filters have already been shown to cuase maf related problems.

or i guess should say the ecu is very sensitive to input from the maf.