hi guys, about to buy a evo ix with a built motor with 10:1 pistons, car is currently tunned with e85, and i was wondering if its safe to tune on 93oct with those pistons at like 25psi?
hopefully some of you guys have done this b4 and could give me some recomendations

thanks..

 

oh, i forgot. its with an fp black

 

I've seen it done, but it's always preferable to go E85 if you can get it. I'd say in comparison E85 will be safer, but pump gas can be tuned for the 10:1. You won't see the HP you want due to the more conservative tune, but it can be done. Oh and if you plan on tracking the car use E85

 

10.0:1 Compression on pump gas means you have to be very very conservative...... If you're switching to 93 permanently and want to make any kind of power you may consider Meth or Alcohol injection..its cheap and easy..

Boost will be low and timing will be low to keep it safe..

FWIW I tuned my buddies DSM with arias 10:1s to 35 PSI (~60 lb/min) on midish framed turbo (some oddball garrett) on pump/meth 1000 cc of meth .. it was pretty nasty really 35 psi 17 degrees timing advance.. felt really strong and a reasonably quick spool...

A good intercooler goes a LONG way on pump gas though too... and Meth makes things even better ;-)

 

Depends also on the headgasket thickness

 

Read the bottom of the page, if thats not enough to say 10:1 will be fine on pump then nothing will be
https://www.evolutionm.net/forums/ev...r-build-4.html

 

i prefer conservative tho, the car is gonna be my dd. the motor just came with the car and i was hopping i didnt have to sell it for it to drive the way i want to..

ive used meth b4, i might keep it under consideration

 

hearing it from the man him self, makes me wanna take the car to him to tune

thanks...

 

i have e85 not that far to me, my problem is since my car is dd, whats gonna happen if i go out of state and run low on gas with no e85 close to me

 

No problem is the answer to the question BUT you need to have some other good parts and not just higher compression. FMIC and cams will be helpful.

 

^this is what the motor consist of along with the rest of supporting mods, is to my understanding that you had tuned this car b4 for the previous owner but you might not remember it

Long block build by Accelerated Performance:
Built 2.0
JE Pistons .20 over 10:1 upgraded wrist pins and coated sides
BC Rods w/ 625 bolts
Manley Crank
Balance shafts removed

Supertech stock size valves
Supertech Dual Valve Springs
Supertech Viton Seals
Supertech valves
ARP L19 head studs
Cosworth M2 cams
Fidanza Exhaust Cam Gear
Gates Kevlar Timing Belt
Buchur Underhood shifter bushings
AMS shifter base bushings
Torque Solution Motor Mount Kit

ID2000 injectors
Sun auto ignition amplifier
Buschur Double Pumper
Mil.Spec 65mm Throttle Body
Ported Intake manifold
EGR Blockoff
Buschur BFIC intercooler
ETS 2.5” LICP
Custom 3” UICP
Tial Q 50mm BOV
Hallman inline mbc
Buschur ported exhaust manifold
FP Black ported w/ 25psi Actuator
FP 84mm Intake pipe

is it good enough

 

You'll be perfectly fine at 25psi with those mods. I have a Buschur 2.1 10:1 @ 27psi... stock turbo, but my tuner said he could have got even more HP out of adding boost - I just started running out of injector.

I will be throwing bigger injectors in this week, and getting re-tuned.

 

Valve timing events will determine whether or not you can run pump gas with 10:1 static compression. Calculating your dynamic compression ratio will give you a better insight as to how much boost you can run on that compression ratio and how conservative you will need to be on timing.

 

Yes.

 

do you ever come to ny? id really love to have you tune my car