Search results

Like the guys said, 2-1/2" pipes should work fine, since the vast majority of the restriction or backpressure in your system comes from pipe transitions and catalytic converter and muffler internal restriction, very little from frictional flow resistance. I made a 2-1/4" system for a stock '91...

Bosch platinums work fine in my car (L98), too: 50,000 miles on my first set, 51,000 and counting on my second set. But the original poster has a '96 with probably an LT-1, so it's quite possible the recommended Bosch is the wrong heat range for those engines. In which case, of course, you try...

Sure your cats can be removed (when was the last time you saw a federal policeman?) but your car might not run very well since you don't have a mass airflow meter, and removing the cats will enormously increase the gasflow in the exhaust and the airflow through your engine. You'd need a new...

I did my '89, I'd think your '93 is similar. Figure an hour or two: it involves removing the rear inner fender to get room to work on the antenna. Not too bad a job, really.

Technically, valve float occurs when cam RPM hits the resonant frequency of the valve train. Best way to prevent this is not to turn the engine that fast, and the cam manufacturer should be able to tell you how fast that is. You can run stiffer springs, and/or spring dampers that act like...

It's not running lean by himself that burns pistons, but running lean and getting spark knock. Diesels run about as lean as you can get, but without burning pistons. What spark knock does is this: the "explosion" disturbs the boundary layer, a thin layer of gases that is not in motion, that...

What you have with the production ECM spark map is what GM thinks should work pretty good almost all the time, for almost all types of driving, and the knock sensor is supposed to be just a way of fine-tuning that map, and protecting against for example a tankful of bad gas.* So you could...

One listened for "knock" or ping, and one dialed the spark back accordingly, if necessary. It's important to keep in mind that not all "knock" is dangerous - just the full-throttle (maximum load) knock. At Ford, we used to call spark knock "the sound of fuel economy" since by the late...

De nada. One more thing about removing the knock sensor: it would have to still be electrically grounded via a jumper wire to the block, or else your ECM would set another fault code, and probably run with spark in full-retard mode. - R

Ken: I doubt the EGO sensor simulators would do you any good; they're intended for OBD-II cars to let you remove a cat without setting a fault code. The two EGO sensors upstream and downstream of the cats on OBD-II cars look for O2 readings that are in-phase, that is, that they vary more or...

Exactly.

Re: pup cats That's because the pups are just "lightoff" cats and aren't needed once the car is warmed-up and the underbody cat is working. - R

Pull the cats; all you have to lose is time - in the quarter mile! Reduced backpressure won't "lose horsepower" for you, increased airflow without increased fuel does. But you've got a MAF sensor that picks up on things like increased airflow, and adjusts accordingly. You stand to gain on the...

A while back I accidentally changed to Mobil 1 15w- 50 on my 7-series BMW with 173,000 miles on it. Don't even ask how you do that "accidentally." You had to be there. Anyway, the only thing I've noticed since is a slight reduction in oil consumption, not an increase, and the several minor...

Depends on where you live - and drive: I wouldn't want to cut out the heat sinks if I were driving here in Texas, in the summer. OTOH, you could always have a "winter" MAF sensor with fins removed, and a "summer" one with fins intact.

Thanks but no thanks. Doesn't seem like a good idea, buying a car from a guy who operates out of a hotel...

I did it, maybe 60K miles back, no problems. Did it exactly as described in the TPIS book, and I saved them for re-installation if there turned out to be no improvement. Just too lazy to put them back though. - R

sscam69: Would that be a ZR-1 you've seen for $15K? A '90? In El Paso? - R

Regarding roller rockers, one theory often mentioned is that they are stiffer than the original stamped steel rockers, and therefore will give the full theoretical valve lift even at higher RPM, giving a slight edge in horsepower. Some folks have tried to document that advantage, but I'm not...

Just curious: What is the coil spring compressor used for? On a C4, that is? :)