700hp goal, injector and stud question
09-13-10, 07:44 AM
#26
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Two years straight, same engine, over 200 passes so far, last season... 780whp, this season... 866whp, stock e-shaft. Still 110psi compression on the same engine, STUDDED no issues whatsoever. This is running two different sets of apex seals front to rear as I wanna compare wear on materials. The moment I switched to studs years ago my problems went away, you say the moment you switched to dowelling your problems went away. Maybe I sucked at dowelling and you sucked at studding, just a thought 
~S~
~S~
09-13-10, 08:24 AM
#27
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700hp? If you're gonna be dumping in so much fuel why not do E85? Find a good tuner that knows what he's doing and you can achieve it with the supporting mods. I doubt you'll want to drive this everyday, so why not go big.
Last edited by SLEEPY_FD; 09-13-10 at 08:28 AM.
09-13-10, 08:59 AM
#28
Just so it's clear I'm not attacking you, I'm just fed up with having to explain to my customers that it can and does work simply because they read on the internet it doesn't and dowelling is better.
Marcel,the engine is a HBP build running a S480 with a 1.10 rear. I may be tearing it down at the end of the season or building a second one for the owner because he wants to try a centre bearing e-shaft we are making and go for a good bit more power. I also agree with RX72c in that porting can help we make power all the way to 9500rpm then it just stays flat to 10.2k where we stopped the dyno run.
OP I can only hope you have a person that knows what they are doing 700whp on simple 93 pump is not a easy task.
~S~
09-13-10, 02:14 PM
#29
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logic says proper porting will help you make more power. Larger ports = more air, more air = more power. properly designed ports can affect the power delivery, there are plenty of threads discussing port design theory. Dan Chadwick for example has designed his ports to specifically promote lower end power so he can use more of the rpm range so he doesn't have to shift during autocross runs. You can find his build thread on one of the other rotary vehicle forums (there's a hint in the way I worded that). The last post in it was back in June and it's titled 93 BB base FD build-up. Granted he's using the 9.7:1 rotors, but the port-work theory is applicable on all rotaries.
09-13-10, 06:50 PM
#30
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I run a semi perepheral port with very large street ports (as large as was physically possible!) GT45R with a 1.28 rear , oversized studs , two piece shaft with center bearing , excessive oil pan and steel block guard, pro jay intake , 2 stage WI and a big air to water Ic set up. I think I may be able to get close to 700.
09-13-10, 09:17 PM
#32
logic says proper porting will help you make more power. Larger ports = more air, more air = more power. properly designed ports can affect the power delivery, there are plenty of threads discussing port design theory. Dan Chadwick for example has designed his ports to specifically promote lower end power so he can use more of the rpm range so he doesn't have to shift during autocross runs. You can find his build thread on one of the other rotary vehicle forums (there's a hint in the way I worded that). The last post in it was back in June and it's titled 93 BB base FD build-up. Granted he's using the 9.7:1 rotors, but the port-work theory is applicable on all rotaries.
09-13-10, 11:35 PM
#34
did he do back to back testing to show that different ports couldnt produce the same low end power as well are more top end power?
The ports i do i have back to back dyno sheets showing more power and torque from over 3000rpm with everything else the same
The ports i do i have back to back dyno sheets showing more power and torque from over 3000rpm with everything else the same
09-13-10, 11:56 PM
#35
Amazing how chidish people can get when they get put in a corner. Zero R thats fair enough mate. I cant argue with your results. If that works for you then your doing it right.
Some of the other people in this thread are amazing.
If you can only produce 780rwhp on your beloved race fuel and you think porting means nothing. You need to go back to your drawing boards and start again.
Some of the other people in this thread are amazing.
If you can only produce 780rwhp on your beloved race fuel and you think porting means nothing. You need to go back to your drawing boards and start again.
09-14-10, 09:13 AM
#36
I have mazda SAE data showing that huge exhaust ports work at 100% throttle from 2000rpm and up. Thats for an NA engine with a race exhaust. **** changes when you stick a small turbine on the engine.
All you need to do is put a massive turbine on the car, and have as wide as possible intake ports with no extra late closing duration, and whatever big exhaust port your testing shows works with your given turbine housing, and you will indeed have more from 3000rpm with your given setup. Now go try those same ports with a baby turbine housing!
I just skimmed Dan Chadwick's build. I'm going even more conservative than him. My intake will be longer and my ports smaller. 10degrees earlier closing all round, and 13 degrees later opening on primaries.
09-14-10, 10:23 AM
#37
logic says proper porting will help you make more power. Larger ports = more air, more air = more power. properly designed ports can affect the power delivery, there are plenty of threads discussing port design theory. Dan Chadwick for example has designed his ports to specifically promote lower end power so he can use more of the rpm range so he doesn't have to shift during autocross runs. You can find his build thread on one of the other rotary vehicle forums (there's a hint in the way I worded that). The last post in it was back in June and it's titled 93 BB base FD build-up. Granted he's using the 9.7:1 rotors, but the port-work theory is applicable on all rotaries.
Agreed you can port for more on the low end, Best I've got to date was 776whp and 618ft/lbs.
~S~
09-14-10, 09:06 PM
#40
I guess thats a hard question to answer. I dont think their is a set rwhp to achieve to show that it works. Why i am curious about, is with for e.g your setup, you do your gt30 setup with your special ports and what not. And then try the same thing with my "backyardy" early opening late closing ports etc.
09-15-10, 12:51 AM
#41
bottom line there is not much to gain in a "street port" but there is much gain in semi port/bridge port if done corectly perfecting the amount of overlap is key
no matter who's drawing board your on......... turbine housing tuning is a totally diffrent board, depending on power band ...........
perfecting the amount of overlap is keyno matter who's drawing board your on.........
turbine housing tuning is a totally diffrent board, depending on power band ...........
09-15-10, 02:12 AM
#42
i agree with some of what your saying.
I disagree with you on the street port. Most street ports are not very good and do anything. But i think the street ports i do are much better then most. they work on the same concepts as a bridgeport or peripheral port with very early opening times and late closing times.
I disagree with you on the street port. Most street ports are not very good and do anything. But i think the street ports i do are much better then most. they work on the same concepts as a bridgeport or peripheral port with very early opening times and late closing times.
09-15-10, 07:04 PM
#43
i agree with some of what your saying.
I disagree with you on the street port. Most street ports are not very good and do anything. But i think the street ports i do are much better then most. they work on the same concepts as a bridgeport or peripheral port with very early opening times and late closing times.
I disagree with you on the street port. Most street ports are not very good and do anything. But i think the street ports i do are much better then most. they work on the same concepts as a bridgeport or peripheral port with very early opening times and late closing times.
i'm jus kidin so don't go all GI JOE on me
09-15-10, 08:59 PM
#45
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i agree with some of what your saying.
I disagree with you on the street port. Most street ports are not very good and do anything. But i think the street ports i do are much better then most. they work on the same concepts as a bridgeport or peripheral port with very early opening times and late closing times.
I disagree with you on the street port. Most street ports are not very good and do anything. But i think the street ports i do are much better then most. they work on the same concepts as a bridgeport or peripheral port with very early opening times and late closing times.
lol damn thats strong
09-22-10, 01:37 PM
#47
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Hey, NI, didn't know you were on RX7club, this is Willie,
I was planning on going with a v160 transmission, but since I decided to wait on the GT42r it won't happen until I go 20b with a ground up build later on.
I was planning on going with a v160 transmission, but since I decided to wait on the GT42r it won't happen until I go 20b with a ground up build later on.
