Welcome to the SR20 Community Forum - The Dash.
SR20 forum logo

Thread: BC stage 2 or Tomei poncams

+ Reply To Thread
Posts: 41-43 of 43
2013-12-13 23:58:51
I will have to say that those dyno's are only good to look at individually but not to compare side by side. Different dyno's is one like you mentioned, but ECU change and temperature difference are the biggest offenders for a VS comparison.

Yes the dyno does SAE adjustments for pressure and temperature, but the MAF and the ECU is to blame for the inconsistency. MAF works by cooling a wire, and the amount of voltage it takes to reheat that wire is what your airflow is determined to be. Colder day means for the same airflow your cooling the wire more, sure you have more oxygen per square inch but that only affects the AFR's. Different temperatures put you in different load columns (TP columns), thus for the same amount of airflow your now running more or less timing. You could tune your car our to run the same timing for both cold and hot day TP columns and have more consistency, but OEM ECU's don't do that.

Either way JWT S3 and S4's is a known 100% bolt on afair, they are also well respected for quality and power gains. Thus if you want something that will drop in and give you gains right away I would stick to JWT. If you want something that may require additional tinkering (cam gears, valve springs, etc.) then go with what ever you want. Another great and cheap option is the 91 intake cam, it's really hard to beat 8whp for $50, S4's will get you 14whp for $400, price per whp is no where near the 91 intake cam's.
2014-01-12 17:16:31
Ended up going with Tomei's shipped for $315 brand new shipped to my door kick ass Japanese custom order, lol. 6-8 weeks to receive though which kind of sucks.

S4s, appear to be the best overall from what I have read. But they are more used, than Tomei new, and Tomei should have zero losses which will suit overall needs and city driving where powerband needs are different. Should also suite Auto-X well.

Surprisingly, very few non roller Tomei poncam dynos to be had with a non turbo engine. I will do a before and after dyno with cams being only change.

BC2s also, CAN have good gains from my research. But it will require cam gears, and dyno dialing time, which I can't justify when a VE is ultimately what I am looking for. And they are SOOO cheap used. Although, they can be dropped in, the powerband is horrible without cam gears.

Thanks all for the input. Love the dramatic banter, and GENUINE advise. You guys and the forum rock. As you were!

2014-01-12 19:07:00
Thanks for the update, that is exactly what I would have done. I look forward to future updates.
+ Reply To Thread
  • [Type to search users.]
  • Quick Reply
    Thread Information
    There are currently ? users browsing this thread. (? members & ? guests)

    Back to top