I’ve been meaning to make a thread on the latest manifestation of my car but I haven’t had a chance till now... the new motor just hit 3k miles, got it back together in March of this year.

So, long story short... I finally put my motor back together earlier this year (crankshaft failure on last motor after 2k miles) and threw it back on the dyno, the only real change I made from my previous setup (which yielded just over 460whp) was switching to the larger 1.06 exhaust housing (from the .82 housing). Still running stock exhaust manifolds too.

I’m still waiting to upgrade my fuel system; it currently consists of 600cc DeatschWerks injectors and a Walbro 255LPH fuel pump. I have a CJM stage 0 RFS waiting to go in, along with 1000cc DeatschWerks injectors. I’ll also be picking up a larger fuel pump as well. Thereafter, I’ll be shooting for at least 550whp on E85.

Here’s the dyno a few shots of the car/motor:

 

Nice power for only 91oct & 600cc Injectors! Congrats GL

 

Congrats! Nice to see another PowerLab car making 500+whp on pump gas with stock manifolds despite certain naysayers who claimed it isn't possible. Was this on ProEFI's dynojet?

 

Thanks!

Yeah, this was on ProEFI’s dyno... for comparison’s sake on the same dyno I made 258.57 whp and 238.90 torque w/Injen intake, PowerLab plenum spacer, TiTek test pipes, HKS exhaust, and UpRev Osiris dyno tune a few years ago (a stock 350Z made approximately 220-230whp).

I could’ve squeezed out a bit more power out of this turbo but I maxed out the injectors and figure it’s time to add a RFS.

 

def hitting the limits of that turbo since trq surpasses whp at higher boost.

 

Yeah, exhaust back pressure was starting to spike beyond 16 psi or so... I figure I should be able to easily squeeze an extra 50whp out of the turbo once I'm running E85.

 

Where was the backpressure measured?
CR?
Boost pressure?
Stock cam?
Exhaust?

Your numbers are comparable to my MTM (same AR) setup at CR= 9:1 and 12 psi.

I have a rear mount 200CEL CAT (v-banded), that when installed drops my rwhp ~40 and peak rwtq remains about the same. So post turbo BP definately affects my rwhp vs. rwtq ratio quite a bit.

 

Its time to switch to PT6266 or better yet the PT6766.

Nice numbers.

 

Backpressure was measured at the turbocharger’s exhaust housing via a ProEFI exhaust backpressure sensor. I’m running Wiseco 8.8:1 96.0mm Pistons, around 14 psi, stock cams, and the exhaust is an HKS Hi-Power with a reverse Y-pipe.

I’ve got a v-banded catalytic converter too, haven’t put the car on the dyno with it though, I’d probably see similar results too.

 

I noted you will be installing the stage 0 RFS. Pay mind to the loss of the driver side fuel damper.

I went though the whole lean resonance issue last year. Ended up adding an OEM damper back in on the Driver side and even added added a third on the passenger side. Works great now.

But If they had existed back then , I would have upgraded to the damper rails that Charles now offers.

 

Yeah, I’m probably picking up the rest of the stage 1 RFS w/dampers... I’ve had issues w/hesitation at 2400 RPM before, don’t want to run into that issue again.

 

Thanks! I would upgrade the turbo but I think I’ll be really happy with 550whp in this car.

 

Nice! Any plans to change the manifolds?

 

Not really, the car already made 500whp with the stock manifolds, I don't really see any need for headers now. Just looking to upgrade the fuel system now.

 

What fuel pump? Flow rates and power I've tested with e85 shows that at least a single 485 would be needed to sustain the fuel flow. not sure the tiny stock hard line would hold that as well.

When I switched over to e85 most of my boost cells required 80-90% increase in fuel despite what people say about only needing 30-40% fuel. That holds true under vacuum map only.

Nice numbers and spool.

 

Nice numbers. Do not use the car with that fuel pump, the pump is at the limit, it will fail.... Happen to me.

 

Right now I’m running a Walbro 255LPH fuel pump, I’m planning on upgrading to the Walbro 485 pump, at the same time I’ll be adding the CJM stage 1 return fuel system and DW 1000cc injectors.

Thanks! AH, the car has been a lot of fun; just need some stickier tires now!

Thanks! What pump? How much power?

 

I was with a 255 and leaned cylinder # 5 because the pump dropped efficiency. The rest is history. Now I did my on fuel system, used the supply fuel pipe as return and a new line number 8 from a 255 in the tank to the fuel rail and putted a Bosch 044 in line.

If you search on the internet fuel flow vs boost for pumps 255. 340, and bosch 044, you will see that 255 and 340 drop flow dramatilly as the boost goes up and the 044 stand almost the same flow.

If you can not make a fuel modification right now, you better run less psi.

 

Awesome to hear people still pushing these kits. Powerlab brothers unite!

 

WRT
"just need some stickier tires now!"

Highly recommend trying the MT Street ET 305s.

Been running around all summer on these , and on the street, really , really impressive how well they hook up. On my normal 315PS2s , when my boost comes on with a vengeance around 3.5k they just haze in anything below 4th. The MTs just hook and rocket in all gears. Just need to deal with the 2x as fast wear. Actually suprised that they actually hook pretty well on a damp road. Don't really need much of a warm up either . I just would avoid heavy rain to temps much below 40. Did need to roll rear fenders a bit.