BryanDyer;1935287 said:
400 hp
stock head is fine if recomend upgrade in springs
forged I internals
intercooler
2.5 inch hard pipes
tuning device or standalone
550 cc injectors
lexus intake
upgraded turbo
3 inch exhaust
itd be easier to hit if you went t4
oh and upgrade fuel pump also
this will limit you to about 450
a good tuning device is something like a MAFT pro which then you don't need the lexus afm
all correct except not all explained. If you go with a 57 trim CT26 or a 60-1 CT26, you can keep the "stock" 3" exhaust setup, if not, then your going to need a different manifold. If you can afford it.. go T4.. newer style turbo.. more power.. less limitations. Cheaper to go there now then to upgrade everything and decide later the CT26 wont flow enough (its a small turbo relatively speaking).
Tuning device can be very dependent on the tuner. Find the tuner first.. then get what he can tune properly. But go be references... there are many ways to tune the car, but the best tuners will do you right. Lexus AFM and 550's will not allow for tuning. Also, the injectors are very dependent on your turbo as well. Higher flow may demand more fuel. For your power goals, the 550's are ample although you may need to go with a larger fuel pump (Walbro 255 lph or there are others, I went with the Denso MKIV fuel pump). You will need an AFPR to control your fuel flow if you go larger. I was washing the cylinder walls with over fueling at WOT so I had to turn down the pressure. You don't really need an upgraded fuel pump with the 550's initially. Your biggest problem will be if you lean out at WOT though.. it will kill the engine quick. (If you don't understand this... you should research detonation and leaning out)
Also, you do not need forged at your power goals. The OEM pistons would be fine. However, you aren't mentioning car overall condition or if its R154 or auto or W58 transmission. 400 HP will make a stock clutch setup slip if I remember correctly...
You can run with stock intercooler, however it has some bottlenecks. An upgrade is a good idea.
Then... think about how your going to actually stop the rocket when it takes off... and how well your going to handle a curve... suspension and brakes cannot be overlooked.
In the end, planning for a stand alone is far better than going with the Lexus/550 upgrade. I would only consider Lexus 550/AFM for a stable 300-325 rwhp MK3. Higher is riskier and harder because the ECU will get you so rich on fuel you will peak out. Too much fuel means no room for air so you max your power sooner. Your torque (which is also really important) would probably be at about 375 with the lexus afm/550 setup when you hit 300 at the wheels. Good hard pulls, but you peak early. Too little fuel will mean you lean out and melt your pistons... (is very hard to do with 550's and a CT26.. the ECU is setup to prevent that). The Lexus afm/550's was intended for higher flow without hitting fuel cut but keeping the engine safe as well. It has its limitations to prevent engine death. After going this path, I am now going stand alone.
And research boost controllers.. you will want that. My 57 trim wastegate was 10 psi.. so without the boost controller or shimming the wastegate, that was my limit. It felt nice.. but I wanted more. For 400, you will need more.
My final thought is... a lot of folks don't realize what 400 rwhp feels like in a MK3. 300-325 is pretty damn awesome, but I break traction with my low profile 255's on a 18" rim.
So... questions.
Got a photo of the car its going into and specs? (age/mileage/trans/suspension)
Planning on streetable DD style ride or tracking the car for 1/4 mile runs?
Dropping it into a Supra or a Pinto?
All the info here is probably going to be slanted on you building a 1986.5-1992 Toyota Supra.. not a 7MGTE powered Rav4....