S5 rotors s4 ecu.....timing??
I am building my engine right now with s5 turbo rotors, and I was curious if the s4 turbo ecu would be dangerous to run. I don't want to have issues caused by the higher compression and i dont know how much different the timing is with the s5 ecu to compensate for the compression. The plan is to eventually upgrade to 720's and run rtek 2.1, but I want to get it running and broke in before I start spending money on performance upgrades. What do you guys think?
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Anybody have input on this????
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I had S5 NA rotors in my S4 Turbo engine for last summer, 8K miles on it and had no problems.
As for the ecu, timing is the same, but I think the s5 has a better knock control unit. |
Originally Posted by The_Eff
(Post 10969693)
I had S5 NA rotors in my S4 Turbo engine for last summer, 8K miles on it and had no problems.
As for the ecu, timing is the same, but I think the s5 has a better knock control unit. s4 Turbo 8.5 to 1... CR. and you're telling people the timing is the same.. happy blown motor... for the record.. i run s5 N/a rotors in an s4 Turbo engine. on 87 octane! and with stock timing, i didn't get any knock as long as i had 93 octane gas... with 87, i had to retard the timing in all boost areas over 2 psi...before, it knocked real bad.. OP s5 turbo rotors are 9.0 to 1 CR... you should be fine with a stock ecu and stock boost levels, but you way want use 93 octane for safey's sake. |
If you guys ran NA rotors I'm just going to assume that my 9.0:1 rotors should be just fine for a little while. Thanks!
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Originally Posted by 198713bt
(Post 10969761)
If you guys ran NA rotors I'm just going to assume that my 9.0:1 rotors should be just fine for a little while. Thanks!
:scratch: is not fine for a little while. as long as you have the right afrs and the right timing you will be fine. just dont go all out on the boost thats all |
Port the waste gate if you have ANY exhaust mods.
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Originally Posted by lastphaseofthis
(Post 10969705)
s5 N/a 9.7 to 1 compression ratio
s4 Turbo 8.5 to 1... CR. and you're telling people the timing is the same.. happy blown motor... And thank you, but my motor isnt blown. |
Timing marks don't mean the ECU's run the same timing.......
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