my 1994 caprice classic 350 LT1

[96capricemgr]

The Borla b-body system is 2.25", going to choke a serious motor. Now if you are talking a custom system using larger universal fit Borla mufflers than fine but I was refering to the available catback.

Most people would say my car needs more than 2.5" but sofar I am getting by, think the x-pipe is what is making the dual 2.5" work as well as it does, gain little opening the exhaust.

For easy boltin, good sound, and flow I like the Dynomax system. Deep and mellow and never too loud.

It is what I started with and then added an x-pipe, get lots of compliments on the sound, closest thing to a negative comment is some guys say it is too quiet especially for the times it runs. That is a good thing though loud exhaust gets old if you are an adult(not just chronological age applies). I leave for work at 5:20am and the neighbors have no complaints.

[454Chevy]

Originally Posted by ilovedizgame

Can you tell me why my caprice takes 1996 impalas i have no work done to my engine. i have raced three diffrent impalas more than once and everytime i take them by atleast a car and a half. I know the car used to be a cop car.
What makes my car so fast? i think the chip theory is real.

The reason for that is that the impala weights more so it slows it down a bit. impalas have carpets and heavier seats etc. there is no chips or anything that make them fast they are the same. And if they did they would not give you the car with the chip.

[silicon212]

Originally Posted by 454Chevy

The reason for that is that the impala weights more so it slows it down a bit. impalas have carpets and heavier seats etc. there is no chips or anything that make them fast they are the same. And if they did they would not give you the car with the chip.

Wrong.

The Impala does not weigh more than the Caprice. The rubber flooring that's in many 9C1 cars is actually heavier than the carpet it's used in place of. It also has lighter seats - 9C1 seats are heavy duty meaning they have more metal in them, as well as shielding on the back of them that prevents a perp from slamming a knife through the seat.

You're right about the chip in that it doesn't exist. Do you really think they'd keep stock chips on hand to replace? Hell no. Most times, they even leave the wiring in the car, and sometimes they even leave wigwags and such in the car. I still have the electronic wigwag that was in my car.

[j cAT]

Originally Posted by ilovedizgame

Can you tell me why my caprice takes 1996 impalas i have no work done to my engine. i have raced three diffrent impalas more than once and everytime i take them by atleast a car and a half. I know the car used to be a cop car.
What makes my car so fast? i think the chip theory is real.

I know of two people that have installed a performance eprom. this will greatly give you more off the line performance. but at a cost. I did not install this because, the gas mileage they both agreed, went from 25mpg to 18 mpg maximum. I don't know if it is still available, hypertech I believe did have this as well as a eprom progammer for this car. eprom performance chip was $275 programmer was $600-800.

[96capricemgr]

The software to be able to truely tune is under $100, allows complete control over fuel, spark and transmission.

Hypertech is garbage.

Far as milage if tuning is done right it can increase fuel economy. My car is not really tuned perfectly I had a professional email me a program which I loaded into my pcm using a program called Tunercat even with a setup as powerful and far from stock as mine with 3.73 gears and a 3400 stall converter I still get about 19mpg mixed and feel with new O2 sensors and some tuning time I could improve that number.

With injection power and economy can be had in relative balance. If you are always deep in the throttle well then economy will suffer but with normal driving no problem.

[Blue Bowtie]

EPROM? The PCMs in these cars a flash-ROM (E²PROM), not EPROM.

I'd agree with the 96mgr - Hypertech is a compromise product, and is not anywhere near optimal. Never has been.

The programming of these systems is relatively easy - Even I can do it. It is also very easy to enable Highway Fuel and Highway Spark modes, raising cruise fuel mixture to 17:1 (or higher if you dare) and to have cruise spark advance well over 50º BTC. That makes for some serious mileage gains, and with a judicious application of EGR, completely prevents detonation and overheating. On the other end of the spectrum, Power Enrichment mode is very adjustable, and PE mixture and spark map, VE tables, and MAF tables are configurable enough to make plenty more power than the factory provided with no mechanical changes. Add some good heads, a reasonable cam, and allow more air through the engine, and the limits are a lot less of a problem. If you want noticeably more power, and 29 MPG when you're cruising, it's not impossible. The factory programming is very conservative, and left lots of room for improvement if you want to take the time to monitor your specific engine and tune several times to get it just right. the reverse flow cooling can be used to great advantage to keep the chambers cool at some fairly lean conditions, and the Detonation Attack and Recovery rates can be tightened up to control any problems and prevent damage. I'm almost certain that's why the factory left so much potential on the table, since they needed to provide a warranty with the engine and could not control the nut between the steering wheel and the seat.

I'd send you my program, but the guys in the black helicopters would have to kill you (government regulations).

[silicon212]

Originally Posted by Blue Bowtie

but the guys in the black helicopters

You called?

[96capricemgr]

To give you guys an idea of how much the computer can handle, when I became interested in cars everything I read said 180-190psi cranking compression was the maximum you could get away with on 93 octane. Now a bone stock b-body cranks 200psi and runs on 87 octane, my car with 11.2-3 static compression cranks more like 230psi, 93 octane is fine. The stock L99 starter turned it over just fine too untill I broke the solenoid removing the wires.

GM got a lot more right with these cars than they did wrong.

[ilovedizgame]

another thing... sometimes from the rear end it smells like pure gas!!!!also inside the car it smells like gas... wut can that be?

[silicon212]

Originally Posted by ilovedizgame

another thing... sometimes from the rear end it smells like pure gas!!!!also inside the car it smells like gas... wut can that be?

A leaky line or fuel filter. There's really not much else that can cause that.

[ilovedizgame]

sup guys havent been online for a couple of weeks. i've got dynomax full exhaust and a k&n cold air filter so far i dont know what type of headers i should go with.... any suggestions??? what else do you guys suggest that i buy in order to make the ar faster.. without opening that block?

[ilovedizgame]

Im also getting new tires very very soon i want some big boys. i got impala wheels and i wanna know whats the fattest i can go???

[96capricemgr]

Last time I tire shopped I settled on the stock Impala size, best balance of height and width I could find. You can get wider if you go shorter but then you are pushing the tire to it's limits because it should be on a wider rim. Think 284/40/17 is what some guys use but they are 26" instead of 27" tall and I was not willing to make that compromise. It should also have more like a 9.5" rim instead of the Impala 8.5".

On the headers is emissions inspection a concern? Probably the biggest single concern when considering headers.

Next mod would need to be headers or gears and posi.

[ilovedizgame]

thank you what gear ratio would you guys suggest for my car to be faster on a quarter mile then on the highway?

[ilovedizgame]

also no emissions inspections are of no concern...