Well im thinking of buying a 88 TII which has a frankenstein motor...the motor is a s5 TII engine with s4 n/a rotors and everything else is s5 but it has s4 ecu and wiring harness... my question is will this thing run safely if i put it back pretty much stock with the higher compression rotors? or does it need to have a standalone??? he said it ran good on the stock s4 TII ecu and wiring harness with everything else stock on 6psi...i have a stock s5 TII wiring harness and ecu if it would run better on that...

thanx

 

3 years ago i ran a S5 block with S4 NA rotors 12 psi daily driven with stock S4 electronics and it ran fine,it was faster than a lot of T2s here in PA,my mods were
3 inch Turbo back
ported wastegate
Greddy Profec B
AEM Wideband
Fuel cut defenser
streetported motor
RA super seals
It ran perfect never had a problem with it.

 

cool i jst didnt kno if the bump in compression would cause it to go lean on stock boost or not... u were running the stock 550cc injectors right?

 

ran stock 550cc but i forgot to mention that i had a aeromotive FPR and i had set my fuel pressure a little higher than stock and that i retarded the dizzy a little bit,i never had any detonation issues at all.

 

so do you think it will run ok if i only run 6psi? with stock fpr...it will have a walbro 255 also

 

i had a walbro and 2 be honest a was running a little rich so 6psi sounds fine 2 me.

 

alright i figure if i wanna go any higher ill get a wideband and go with a rtek 2.1...anyone else have any opinion on this?

 

so are there any advantages to running N/A rotors in a TII motor? i have a S4 N/A and Turbo II that im currently rebuilding

 

you will be running higher compresion...hence more power

 

im gonna say it and call bullshit.

you forgot to mention anything as far as fuel upgrades go.

 

n

 

,

 

thanks for the info alex91n/a another question will this work with my stock N332 & N333 ECUs? thanks to anyone in advance

 

...

 

i alwaayys wanted to run 9:4 rotors in a 4 port t2!!..one day i'll try it out. my next engine will be that.

 

I would highly recommend you have an engine management system that can control timing, either Rtek 2.1 or a standalone.

 

Im runnin 12 psi on my 9.7cr rotors....

 

hmm, I have a s4 t2 AND a s4 N/A. I need to rebuild the t2 and my N/A is starting to run ruff. the theory is the same for an s4 t2 motor right? I think the difference in compression between s4's and s5's is from the rotors themselves so housings should be the same other then minor spark plug location iirc. maybe I'll tear down my N/A too and use those rotors for the t2. I'm swapping that all sound like it would work out the same? joeylyrech said he was using s4 electronics (I assume all s4 sensors on motor) so sounds like it wouldn't pose any problems.

 

That is correct!I was using all the S4 turbo electronics and i had no problem at all!

 

so do you think it would be safe to be running 300-350 rwhp in a high compression motor like that? with supporting mods of course (i.e. stand alone EMS, fuel mods, bigger injectors, streetport, etc). It would end up running less boost to reach those levels due to higher compression but I don't know if it would be better just to run stock t2 compression and more boost to get the same results.

basically, I'm wondering about the longevity of the engine before blowing something. is there more chance of blowing coolant seals are coolant passages when using a high compression rotary? I'm going to go out on a limb here and say that either way, the engine would be seeing the same amount of internal compression for that hp. just less boost for high compression and more for lower compression. not sure if that is right at all. opinions? this car is a drift **** and my dd so would like a rebuild thats going to last a little while. Just thinking for down the road as that is my hp goal.

 

thanx for all the input guys...im piecing the car back together right now...its gonna be run on s4 TII electronics with stock boost...my injectors are out getting serviced right now, fuel rails and afm are fixn to be in the mail so hopefully ill hear this thing run pretty quick!! it has a s5 turbo so i think boost control shouldnt be hard....only other thing aftermarket will be walbro 255 pump...that should be fine for stock boost right? only looking to get this thing back on the road and put it for sale to fund my 89 TII project!!

 

s5 na's in my junk, runs great!

 

^wat other supporting mods to you have what boost level?