Mylzi

Is it ok use this chip with Headers, RT cats and Corsa exhaust system or does it make engine run too lean ??

I think that chip we got with headers has something wrong, engine runs really rich. I wouldnt like go back to stock GM chip course engine runs so hot with it.


http://www.zr1specialist.com/HAT%20W...librations.htm

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LT5 Performance Engine Calibrations
These engine calibrations are designed for stock or slightly modified engines.

Modifications that are accommodated nicely by these calibrations include: Low backpressure exhaust systems and intake air flow improvements.

The calibrations are based on the latest GM service part calibrations that are available for the LT5 engines.
--

Mylzi

With stock GM calibration fuel delivery at wide open throttle is about 6% rich and with that chip fueling is reduced by 3%. So fueling is about 3% rich with stock ZR1.. But is that 3% enought rich when I have headers, RT cats and Corsa.. Or does engine run lean?

Is it safe use that chip or do I need go back to GM chip and send chip I got with headers back to Marc if there is something wrong with that. It just runs so rich that all my plugs did go black/die.

Chip that was for stock engine with 3% reduced fueling did work very nice.

ZR1 MK

What does Marc say? His chip is tuned for you mild mods, so it should be what you want. The only real way to confirm afr (air to fuel ratio) is to dyno or have wide band 02 kit installed for you to monitor.

Mylzi

Nothing yet. I did drop him email. CF is faster.. And you know.. its sometimes difficult to wait when you are going WOT too..

We have many very expert people here and I am sure someone has experience of Marcs 'stock' Memcal and has maybe changed headers to his Z later too.

I been reading his LT5 Power Upgrades.PDF

It says that factory fueling is about .6 AFR rich. Is it same as that 6% rich? Then if it reduced 3% it would be .3 AFR rich? Right? PDF says that +.1 for low backpressure exhaust system and +.2 for headers.. Those two together is +.3 .. Wouldnt it be ideal?

MrCrowley

I sent you an email.

415LT5-badZR-1

You need to call Marc right now, and discuss the problem you're apparently having. There is nothing wrong with his chip, and it will be fine with headers - the cats make no difference one way or the other. Give him a call.

Mylzi

That chip is for stock or slightly modified engines.

Modifications that are accommodated nicely by these calibrations include: Low backpressure exhaust systems and intake air flow improvements.

Is it ok with headers too? so engine wont run too lean?

I did email Marc.

DDSLT5

Highly doubt it will run too lean. Regardless -didn't you say your O2 sensors were boths running too rich?

Mylzi

Yes. But it was not that same chip.

I have 2 chips (3 if we count GM chip too).. One is Haibeck stock chip and other Haibeck chip that I got with headers.

For some reason it looks like that chip i got with headers makes engine run really rich. Thats why my spark plugs stop working, problem fixed with new spark plugs and GM chip change back to car.

Is it safe use Haibecks stock chip with headers? Or does it run too lean with it?

I did read somewere that extra fuel needs to be add with headers.

ZR1forFun

You do not need to add extra fuel with headers. As already pointed out, the stock GM chip fuelling is by design rich at WOT.

I have headers, Corsa and ported plenum and injector housings on my '90. The AFR was about right when checked on the dyno with a stock chip.

You only need to add fuel if you port the heads or increase the displacement.

Mylzi

Yes I know that.

But I am not talking of GM stock chip, I am talking about Haibecks stock LT5 engine chip that has reduced fuel about 3%. When stock chip runs about 6% rich. It is for cars that have little mods like aftermarket exhaust system and intakemods. But is it ok with headers too or does engine run too lean?

This is NOT GM STOCK chip

nowa

Mika,

do you have your car back ? I think you have a scanner ( EASE ? ). Monitor your engine. Look at o2 sensor voltage at closed loop (after 5min. runtime). It should look like a sinewave (vary from 0.3 to 0.8 volt). Left and right sensor voltage should look nearly the same ( over time ). Whats about the integrator readings ( they should be near value 128 ) ? We need more scanner data

I have an interest in this case, because I will change to nearly the same modification in the next months (Stainless, Random, B&B, DRM-Chip).

norbert

Mylzi

Not yet. I just wanted to be sure witch chip I use after car is back home. GM Stock or Haibeck stock chip. Yes.. I have Ease. What about that O2 voltage etc? Does Ease tell if car runs lean? Just wanted to be sure can I use Haibecks chip thats for little modified engine like stock LT5 with aftermarket exhaust or maybe intake mods.

Heck.. I got my Air Blaster yesterday, but dont have car..

Well.. I did drop Marc email, he knows his chip best

ZR1forFun

Ease will tell you if the closed loop calibration is correct, you can tell by looking at the BLM (long term fuel trim) values. Higher than 128 means the basic fuelling is too lean and less than 128 means its too rich. To check the AFR in Power Enrichment (open loop) mode, you will need a wideband O2 sensor, as the BLM's are locked to 128 in open loop and the ECM relies on pre-determined fuelling values in the PE tables.

The GM stock chip and Haibeck stock chips are close enough so I recommend using either, I wouldn't use one that removes fuel from the stock calibration unless you can verify the AFRs using a wideband O2 sensor.

ET-VIPER

The Stock Gm Chip And Haibech Stock Chip Will Be Fine.i Just Got My Chip From Haibeck When I First Started After Install Ran So Rich Could Not Even Get It Out Of The Drive.second Time Ran Better.went For A Spin Down The Highway Hit 130 Mph
Couple Times Running A Lot Better.still Have A Issue With Hot Restarts Going To Test Injectors Hot. Haibeck Said Sound Like A Injector Acting Up.seem To Me The Car Had To Learn The New Chip.i Am Happy With The New Chip No Back Fire With Headers,do Not Haft To Turn On The Key And A Lot Smoother When The Second Injectors Come In To Play.try It A Few Times See If Your Car Does Better.

Steve

90 Corvette ZR-1

Even with marks chip going 3% leaner than the GM chip, you are still 3% rich at WOT. It will not be a probelm.

DDSLT5

All the chips should be fine with headers. Period. If one of Marc's is running rich - then it is calibrated wrong - send it back so Marc can correct it. You will not harm the engine running on the stock chip with headers. Clear?

Mylzi

Yes, but new aftermarket exhaust system does -1% and headers -2%.. Then it should not be rich or lean. But I dont still understand that I got new chip of Marc for use with headers.. if his chip for stock ZR1 would have been fine with headers why send me new memcal with headers.

DDSLT5:
I am going to send that rich running chip back to Marc so he can check whats on it. You said that running with stock chip does not harm engine with headers.. Do you mean stock GM chip (I am sure it wont harm), or do you mean Haibecks chip for stock engine that is 3% leaner than stock GM chip. I would like to use that Haibecks chip, but I am not sure if it runs too lean with headers. GM chip is safe for sure, it runs 6% too rich with stock ZR1.

Thanks

DDSLT5

Where is that 'beat head against brick wall' icon?


Okay - for the last time: ALL YOUR CHIPS WILL BE SAFE FOR THE MOTOR. The custom one for the headers will provide the best performance............unless something isn't calibrated right - have Marc check it to be sure the cal. is right for your application. There is no chance in hell you'll run lean enough to do any damage with any of the chips in your possession.

Mylzi

Thanks. thats just what I wanted to hear. Marc just told me earlyer at spring that with headers extra fuel needs to be added. But Its most important that 3% leaner chip wont damage engine when its used with headers. It is just something that I couldnt handle.. Blown LT5. Please dont hit your head to wall..