driftin180sx

i kno it will be a while til i get my FD (probably like 2-3 years) but hey it never hurts to do some research early right? neways i have always loved apexi products and wanted to make my FD a testimate to them (besides the bodykit which i think is ugly). i was plannin on going with apexi RX6 single turbo conversion/large front mount/power FC/N1/downpipe obviously with appropriate non-apexi cooling/fuel system/clutch/apex seals to cominsate for the increase in power. i was just wonderin a general estimate on hp and torque ratings on what this setup will yeild, or if anyone has the RX6 turbo if you have a dyno sheet. thanks a lot.

GsrSol

In 2-3 years I'm sure the RX6 would be replaced by something better. Anyways I think most single turbo conversions with the appropiate mods produce in the 430- 450rwhp range for street use.

Search the Single Turbo forum

BlackR1

maxcooper has a real nice RX6 turbo set up. He put down ~360rwhp @ 16psi (?) very nice numbers...Unfortunately I think his engine is blown right now so it'll be some time before he gets to do another dyno pull.

I'm going along a similar route with A'pexi products...i'm hoping with the larger FMIC and larger GT spec piping, I can pull the same numbers with lower boost. (max is using the m2 SMIC and RS*R exhaust)

check out www.maxcooper.com for a very well done detail on his car's evolution.

I'm halfway there with exhaust and fuel mods (GT spec, Power Intake, PFC) and I have a dp, mp with dyno tuning coming soon after I get my car out of the shop sometime this week.

Good luck on getting your FD, and be patient

thatoneguy

He blew his motor?! Didn't he spend a fortune getting it rebuilt by Mazdatrix last year? Poor Max.

BlackR1

oops.... 367 rwhp @ 13psi

I remember reading a post either here or on the big list some time ago where he mentioned that it blew up. Maybe he'll chime in and correct any misinformation. Hopefully I'm wrong

maxcooper

Yeah, that 360@16 psi was the first thing I wanted to correct! I have since noticed that the boost is down to 12 psi by the HP peak, so it was probably more like 367@12 psi.

I did blow the motor. It still runs okay, but I am pretty sure I cracked a seal. The boost control failed (I think the WG got stuck shut) and it overboosted big time. My peak/hold fuel pressure gauge normally reads 58 psi after running 13-14 psi of boost. I have the stock FPR, so it should just read 40 psi plus the boost, but apparently it gets a little higher than that. Anyway, after the incident my gauge was storing a peak of 85 psi. WAY too much boost. It boosted up to about 18-20 psi before I let off in an investigative drive I took after the engine popped.

Most of the time it just boosts to 12-13 psi, which is the "spring" boost with the pressure hose going straight to the WG line like I have it. I used to have the stock solenoid under control of the PFC feeding the other port on the wastegate (including a vent in the line), hence the 15-13 psi boost patten from my dyno run. But that didn't work very well because the stock solenoid doesn't flow enough air. So, I just installed an AVC-R to handle boost control when it is 100% again.

I think the wastegate is acting screwy, so I'll probably replace it during the rebuild. I think I'll switch to a proven unit from TiAL. I hate to blame the A'PEXi wastegate without more data, but I suspect that it is the problem and I don't want to waste another engine finding out. It has received extreme abuse in my car with the J&S falsing and retarding the ignition (really hot exhaust gas), so perhaps it is more reliable under normal circumstances. I also seemed to have a problem on the track in that it would get really sluggish boost response at low RPM, which I think was caused by the wastegate getting stuck open. It didn't matter much because you aren't at low RPM much, but it was annoying in some corners where you are at the bottom of a gear. I'll try a new wastegate and see what happens.

My goal is still to make a streetable, trackable car that runs 15 psi without overheating or failing under heavy track use. It should make 400+ RWHP like that. But it's got to LAST! I don't want to build the car to post a couple of dyno numbers and then pop. This has been my goal all along, but I hit a bump in the road with the boost control problem.

One thing to keep in mind in planning a build-up is that it takes a lot of tuning and experimenting to get any setup to make good power and work like you want it. I don't think very many people have successfully just bought a big load of parts and had everything work well immediately after the install. Plan on a fair amount of debugging and fixing and/or upgrading the supporting systems. It takes a lot of development to get it all working right and durable, especially if you plan to track the car.

I am not heartbroken. This kind of thing just goes with the territory. The car will go back to Mazdatrix for a new motor. The last one they built me held up well to a lot of abuse, and my overboost would have killed the motor no matter who built it. I am surprised it runs as well as it does after that!

-Max