Non-turbo 428rwhp FD build up and history by GtoRx7

By diyauto
( 5 )

3 minute(s) of a 136 minute read

12-2-2011

12-2-2011


The new findings will directly correlate to a sideport engine. As most of the gains were not p-port related. 25-35hp is the gains a sideport engine under 9k will get vs. were I was at before. IDK about 400rwhp, but maybe. If I have some time I will do a pull with p-ports capped off. It wont be a great indicator, because I designed the exhaust to resonate at 8.5-9.5k. Sideports alone wont flow really well there, so torque will suffer. Be cool for a reference though. 


Looks like the transmission didnt break a gear. I drained the fluid and there are no chunks in it. If I had to guess the pressed in dog ring separated from the gear. There were lots of metallic metal in the oil. It looked like metallic red paint. So something wore away or metal on metal rubbing. Will tear it apart soon, but going to take a bit of a risk and go back to dyno and use 4th gear. Need to get a final number before engine mods!




12-8-2011


Got on the dyno for the final time this year. Took a risk and just did runs in 4th gear instead of 3rd. Eats up more horsepower on a car like mine because the pulls are going into the 175mph range. 


Results were still pretty good. Matched hp, and gained torque and a lot more under the curve. 475rwhp and 281 rwtq. In the standard 3rd gear run it would be 481rwhp and 284 rwtq. 


Tuning gave me a bunch of issues. The fuel pump seems to be maxed out (walbro 255) so it was very inconsistent. AFR's on the best pull were still 12.6's so some more was in there. 


interesting results-


Race gas lost hp and tq. Not a huge amount, but it did drop power. 93 octane seems to still be the best. 






6-15-2012


Over the winter my RX was featured in a smaller magizine called "S3". A lot of good photos came out of it, so figured I would post a few. The last one with me walking away from the car wasnt planned. I didnt even know they were taking pics right then! Haha










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