Hypertech chips
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Joined: May 2006
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From: Michigan City Indiana
Hypertech chips
I was thinking about doing 3 more things to my 91. Hypertech chip, cold air or ram air, and removing my cat.
I have LPE intake superram, LPE headers, K&N air filter, 58mm. BBK throttle body, Borla exhaust, and 100hp shot of NOS.
I wonder if the missing cat will mess with any O2 sensors. It just seems so restrictive. I have Good air going in, then it flows out of large long tube headers only to hit the brakes at the cat, then out the Borlas.
I also wonder if the Hypertech will be noticable with all the other stuff I already have on it.
I have LPE intake superram, LPE headers, K&N air filter, 58mm. BBK throttle body, Borla exhaust, and 100hp shot of NOS.
I wonder if the missing cat will mess with any O2 sensors. It just seems so restrictive. I have Good air going in, then it flows out of large long tube headers only to hit the brakes at the cat, then out the Borlas.
I also wonder if the Hypertech will be noticable with all the other stuff I already have on it.
Last edited by sebesta1990; May 20, 2006 at 11:07 AM.
Racer
Joined: Aug 2004
Posts: 379
Likes: 170
From: Buffalo Grove IL
The L98 has a single O2 sensor upstream of the catalytic converter, so removing the cat won't affect it at all.
As far as the Hypertech chip, it seems like the vast majority of this forum think it's junk.
Good luck!
Ben
As far as the Hypertech chip, it seems like the vast majority of this forum think it's junk.
Good luck!
Ben
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Joined: May 2006
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From: Michigan City Indiana
Thank you. It was kind of bugging me. My friend who has a Z28 always goes to a forum at Z28.com. I thought if there is one for Z28's then I know there has to be one for Corvettes. I told him when he grows up he'll get a real car. Theres only one. Corvette! THANKS
Le Mans Master
Joined: Feb 2006
Posts: 8,753
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From: Louisiana
Yes, the Hypertech is junk. To get you engine tuned right you will need a custom chip. As for the O2 sensor and the cat. The O2 sensor is upstream of the cat so there will be no problems there. If you gut you stock cat there will be some turbulence in the cat that can make resonace in the cabin. I would get a high flow cat for that. You are also going to need a heated (3 wire) O2 sensor with the headers. The O2 sensor is not getting hot enough and the ECM is probabably in open loop more than closed loop.
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
A heated O2 sensor is different than stock. It has a signal, ground, and power wire. This enables it to be self heated. With headers the O2 sensor doesn't get as much heat as with stock ehxaust manifolds. Open loop is when the ECM uses various sensor on the engine to control idle and air:fuel ratio (less efficent). At about 140* engine temp and/or 600* exhaust temp the O2 sensor will become the bigger factor in sending signal to control air:fuel ratio (more efficent). Yes, a straight pipe will be better that a gutted cat, but will be just as bad for the enviroment. A high flow cat will cut down on emissions and still flow as good as a straight pipe.
Le Mans Master
Joined: May 2004
Posts: 5,866
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From: Hellinois
Finalist 2020 C4 of the Year - Modified
Read this slowly and clearly, YOU STILL NEED A HEATED O2 SENSOR! The Hypertech chip will do more harm than good, with your setup the engine will run lean. I've just been through all this and I got a custom chip from ski_dwn_it here on the forum. His prices are just a bit more than the Hypertech but his chip WILL work and he stands behind it 100%. If something is not quite right with the chip he will re-do it for free. He hit my combination perfectly the first time.
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Joined: May 2006
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From: Michigan City Indiana
Sounds good to me. A custom chip just sounds more reasonable, instead of what sounds like a generic chip (Hypertech). Everybody's car has different mods. Different setups. Thanks
Le Mans Master
Joined: Apr 2000
Posts: 6,341
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From: Shelton CT
Yeah the Hypercrap chip is NOT GOOD ENOUGH for your mods.
The second you added the headers and the superram you required teh custom chip. I am surprised you are not having issues with the engine starting time and WOT being leaner than hell..
Get a good tune, keep the catalytic converter (I ran low 12's high 11s with my '85 and it was still emissions legal.)
Yes, you'll gain 1-2 tenths from it, but that little didn't matter. To Me at least. The Heated seonsor will make sure you get into closed loop. ALthough on my '85 I didn't need it, most of the time ones you add longtube headers you should add it..
The second you added the headers and the superram you required teh custom chip. I am surprised you are not having issues with the engine starting time and WOT being leaner than hell..
Get a good tune, keep the catalytic converter (I ran low 12's high 11s with my '85 and it was still emissions legal.)
Yes, you'll gain 1-2 tenths from it, but that little didn't matter. To Me at least. The Heated seonsor will make sure you get into closed loop. ALthough on my '85 I didn't need it, most of the time ones you add longtube headers you should add it..
Le Mans Master
Joined: Feb 2006
Posts: 8,753
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From: Louisiana
An easy way to tell is checking your spark plugs. Another is to use a paperclip in terminal A and B of the ALDL (two next to each other on top right) after the engine is running. This is considered Field Service Mode... the Service Engine Soon light will start flashing. If it flashes once a second, the O2 sensor is telling the ECM that it is within range. If the light stays on more than off... it is running rich. If the light stays off more than on... it is runnig lean. Other than that you'll need a diagnostic scan of your BLM's
Three ways I know...
Three ways I know...
