Wondering if anyone has stories or experience of high compression n/a rotors. Mainly the s4 9.4:1 rotors.

Was thinking of doing this if I move back east where I can get 93 octane daily.



Anything at all other than stupid hearsay would be appreciated!

Thanks,

Ben Martin

how much power are you lookign for?



i have realized, i ask this quastion every other post https://www.nopistons.com/forums/pub...IR#>/smile.png

well, im running pretty much bone stock s4 t2 except for dp right now



i have fd fuel pump, hks fcon and rb presilencer, but thats for this motor. no highcomp for stock ecu! or at least not w/ any real power







I was thinking 60-1 and over 300rwhp on pump. but thats a long ways from now

the compression depends a lot on how much boost you want to run, and what power goals you have, and a BIGEST part is how its tuned.

take one for the team and get some renesis rotors. see how far you can get with those...

[quote name='BigTurbo74' date='May 16 2005, 01:03 AM']take one for the team and get some renesis rotors. see how far you can get with those...


[/quote]

thank god for post *****s



nice sport btw, ever dyno her?

i wish it ran...

for 300rwhp, i dont see a need for higher comp rotors?

my buddy used the 9.7:1 compression rotors on a bridgeport with a t66.



budget limitations are holding ti to about 8psi for now, but it's got AWESOME low end!!!



the high compression rotors really seem to like the 4-port motors. i'll be using them in the cosmo 13b that's going in my fd.

i THINK voskos old fd (god rest its soul) had either 9.5 or 10 :1 and ran on street gas (93)



find out when you move back here if the area you will live in will have a gas station that sells cam2 100 or sunoco GT 104. 2 sunocos within walking distance of my new place sell gt104 at a pump.

imma run mine on crappy californian 91 https://www.nopistons.com/forums/pub...#>/biggrin.png



this engine will have water injection and NO timing until i figure out what i can get away with.

just to get it straight my old car had FD 9:1 rotors. S5 n/a are higher cr and when i build another engine it will be using those.....

Timing becomes most crucial when upping the compression...can this be equivalent to tuning for more boost, or is this completely different?



Sorry...n00b trying to learn somewhere. https://www.nopistons.com/forums/pub...IR#>/smile.png

na, you got the idea. i wish i were more help right now, but the engine isn't together, so i don't know how much timing to run yet. i plan on having it all running by mid-late june though.

I think this is the wrong thread for this comment, but I think there are better ways of getting low end response and power. You can use a smaller (.84) a/r turbine housing and increasing the timing at negative, zero, boost levels.

but imagine increased timing at vaccuum w/ high compression https://www.nopistons.com/forums/pub...#>/biggrin.png





but yea, a 60-1 even on stock ports spools damn good. i guess i just like to over complicate things

I ran 9.4 rotor with a T3 turbo for 18months. Everyone thought the car was on laughing gas it was so responsive. Ran 19-21 psi with the 60-1 .86 stge III wheel.

The motor was a 86 na 6 port with turboII port matched LIM. One weekend during a Nopi event the car ran four 11.8 and one 11.6 at 120-123mph. 2720lb with me. 16psi in first, 17 psi in second and 3rd and 4th gear was 20psi. Then went to a T4 turbo, 96a/r p-trim with 8.5 rotor and a small bridge. Two completly differant motors. For intown use the 9.4 rotors with the T3 turbo would kill my second set up. but if we got out on the open road the 8.5 rotor and T4 turbo would easly walk away, above 120mph. Ran both set ups at 20psi. best time with second set up was 11.4 at 127mph, (85% tuned) you can see the mph differance.

I know the turbo has something to do with how the motor pulled, the rotors has to have something to do with it also.



I did crack two rear s4 plates trying the na rotor and T3 turbo. They cacked because of my stupid mistakes. Not from anything else. When I return to San Antonio I will go back to 9.4 rotors. With S5 turbo motors, the ones with bigger casting around the dowel pin areas.

chuck

Give it up Ben.



-Destin

[quote name='sleeper7' date='May 23 2005, 03:09 PM']I ran 9.4 rotor with a T3 turbo for 18months. Everyone thought the car was on laughing gas it was so responsive. Ran 19-21 psi with the 60-1 .86 stge III wheel.

The motor was a 86 na 6 port with turboII port matched LIM. One weekend during a Nopi event the car ran four 11.8 and one 11.6 at 120-123mph.
[/quote]

i am very impressed by this.