haha, big time! I only use CL for wheel & tire fitments. I like Lextreme because its civil, to the point and like you said, more DIY oriented. 90% of the engine experience on their forum comes from 2JZ backgrounds so for someone modding a 1UZ, its like being in a foreign country.I originally found club lexus, but they seem more interested in hella flush and 20's
As an engineer, buy this book: "scientific design of intake and exhaust" - I think that's the name. For a fee burns stainless will do the analysis fir you too- they are top shelf. I've studied it extensively and there us a lot to know.I appreciate the help, I'll see if I can ask JBrady some more questions. As an engineer, I tend to ask a lot of questions, and seeing data helps. If there's dyno charts of with and without cats, it'd be cool to see.
Spinnetti, I know your speedo is a bit off from the final drive but can you estimate what rpm your seeing at 75mph? My SC400 has a slightly shorter 4th gear so im seeing 3,000rpm at 75mph. Maybe 2800 on the LS?
Well, the car doesn't know how fast its going. I calculates it based on RPM at the output of the transmission. That way, doesn't matter what gear you are in, or what the RPM of the engine is - it "knows" what the speed is based on the assumed tire diameter and rear axle ratio x the drive shaft RPM. As you go "bigger" in rear gear, it will actually read that you are going faster than you really are. Conversely, if you put taller tires than the stockers or a lower rear axle ratio, you will be going faster than it reads. So, if you want to be safe, put the SC300 rear in and you will read about 10mph fastgood info, thanks. This is funny but now I understand why I got a speeding ticket a few months back. I was clocked going 95 in a 75! I was judging my speed based on the transmission speed sensor so I was assuming I was around 85mph but now knowing that I was genuinely doing that speed, i'll lay off the gas from now on. I have been told the trans will tell the ecu a different speed so my top speed is cut a bit short but im wondering ig I can trick the VSS with a resistor to squeeze out some extra top end.
Thats what i assumed. I want to try swapping an sc300 speed sensor to hopefully re-calibrate. I feel ya on the posting edits... we used to have a 5 minute grace period but ever since the forum was hacked, we lost the privelage.you should have been going SLOWER than indicated, not faster.... mystery there.