96 LT-4 Build Dyno results
#81
Stay away from a Holley, they look pretty but could never get my car to run right when I had one and I'm not the only one who has had an issue. If you are on a budget, Professional Products works well. Another option is BBK but I've not run one.
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Gen2-LT4 (11-19-2019)
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Gen2-LT4 (11-19-2019)
#84
#85
Was it due to no air passage for the IAC? I have a 58mm LPE/Acell and for years I couldn't figure out why my car wouldn't idle for **** and would have to relearn if power was ever disconnected from the PCM. Wasn't until I read here about some aftermarket TB's not having an air passage. Drilled one and now it's fine and doesn't have to "relearn."
#86
IMHO, if you can find a source to do it, have your stock 48 bored to 52. Many years ago a guy named David Kudos did them and is the guy who did mine. A stock TB re-bore is WAY more plug & play as it has the correct IAC air passage.
I will note you "may" (if this is a H/C build) need to drill the stock 1/8" IAC hole 1/64" larger but DO NOT do this unless you have scan ability to read IAC counts. That note applies to any TB especially aftermarket ones where you will need to drill the hole. IAC counts want to be 32 (30-35) at idle with engine at full operating temp
Bypass the coolant flow through. I just use 3/8" vacuum caps on the ends of the TB nipples but none are needed
I will note you "may" (if this is a H/C build) need to drill the stock 1/8" IAC hole 1/64" larger but DO NOT do this unless you have scan ability to read IAC counts. That note applies to any TB especially aftermarket ones where you will need to drill the hole. IAC counts want to be 32 (30-35) at idle with engine at full operating temp
Bypass the coolant flow through. I just use 3/8" vacuum caps on the ends of the TB nipples but none are needed
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Gen2-LT4 (11-19-2019)
#87
Was it due to no air passage for the IAC? I have a 58mm LPE/Acell and for years I couldn't figure out why my car wouldn't idle for **** and would have to relearn if power was ever disconnected from the PCM. Wasn't until I read here about some aftermarket TB's not having an air passage. Drilled one and now it's fine and doesn't have to "relearn."
Another nice option, if you can find one, is an AS&M (Arizona Speed & Marine). Oh and definitely bypass the coolant passage, you have no need for it.
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Gen2-LT4 (11-20-2019)
#89
You are correct, there website lists it as, "no longer available" but I ordered one over the phone. Apparently the person who took care of the website side of things passed away 2 years ago and took the access with them...
#90
I ordered the MAF housing they offered since it was only $75. If it proves no extra power and/or causes any issues ill just return to stock, small gamble. Ill post DYNO results but due to the holiday season im not sure exactly when that will happen. Is need to send the Nitrous kit to Induction Specialties to have it inspected and flowed. I dont want to take any chances (even though its only jetted 175hp)...
#91
I ordered the MAF housing they offered since it was only $75. If it proves no extra power and/or causes any issues ill just return to stock, small gamble. Ill post DYNO results but due to the holiday season im not sure exactly when that will happen. Is need to send the Nitrous kit to Induction Specialties to have it inspected and flowed. I dont want to take any chances (even though its only jetted 175hp)...
Are you installing a 52mm TB at the same time?
#92
I have a 3rd bung in my collector just for the wide-band O2 my DYNO guy uses. Ill likely get a wide-band stand alone and install it to keep an eye out when using the N2O...
Anyone have a recommendation for that?
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Gen2-LT4 (11-20-2019)
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Gen2-LT4 (11-20-2019)