When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Just another dyno - Toda header and Megan Testpipe
I went to dyno today at a local speedshop with a dynojet after adding the Megan TP and Toda header. Last weekend, I got a baseline dyno with CAI and Mugen exhaust - 193 HP / 138 Tq. Of course I was less than impressed, and I was informed that stock S2K's have recently been putting down about low 190's on their machine. A few days ago, I installed the testpipe and felt a noticeable difference. I tried to go dyno again with just the testpipe, but that didn't happen. So a good friend and I installed the header last night (Prolene's recommendation of using the OEM car jack to push the engine aside worked well). And off to the dyno we went. I did not reset the ECU since I did not want any differences in the dyno numbers to reflect the reset.
Run 1 is the baseline run with 193 HP from last Saturday with just the CAI/exhaust. Run 2 (not shown) put down 190, and run 3 was an anomaly and was chucked. Runs 4,5, and 6 are today's numbers - 199, 200, and 203 HP. The biggest gain is right after 6K rpm with about a 10-11hp increase. The increase in torque is less than stellar, but I wasn't expecting much. Now the caveat here is that the runs were done on different days and different operators, who may possibly use different settings on the dynojet. There is also a slight difference in temperature (88F last week and 85F today), which may account for the increase in HP. Also, how much of the increase is attributed to the testpipe or header individually? I can't answer that since I wasn't able to get it dynoed right after installing the tp. Overall, the gains were mediocre. Should I be impressed? I've read other threads where people are seeing gains of over 10 HP from just a testpipe alone! I just don't know. The Mugen exhaust is not helping I bet, but I do love the note.
My friend also dynoed his SR20T-swapped 240SX and put down 210 HP/ 208 TQ. And yes, he pulled on me on the highway about a car length or two from a 60mph punch while we were heading to the shop.
Thanks to pitstops for the tp, Vader for the header, and S2kracka for the CEL fix. No CEL so far. The CAI that I'm running turns out to be an Injen replica fwiw.
Those gains are pretty respectable, in all actuality. There's a healthy delta between the stock and new curves. I can tell you that you could defenately benefit from some form of ECU tuning, whether it be a VAFC, Greddy, or AEM EMS. Your AFR runs lean just before VTEC (typical), and goes really rich in the upper rpm's. Fattening your fuel just before VTEC will put you back into the safe region, and leaning it out up top will help get the peak gains you were probably looking for. For N/A applications, I'd shoot to get your AFR between 12.8 and 13.8 through the entire powerband.
06-03-2006, 07:10 PM
Just another dyno - Toda header and Megan Testpipe
Overall, the gains were mediocre. Should I be impressed? I've read other threads where people are seeing gains of over 10 HP from just a testpipe alone! I just don't know. The Mugen exhaust is not helping I bet, but I do love the note. 
The CAI that I'm running turns out to be an Injen replica fwiw.
I am debating whether or not to get a single though.
