RIP, I know the feeling, hard to get anything these days. I think I may just go back to the stock TB when I throw the kit on. Have you experimented with different intake or filter setups?

 

Unfortunate to hear about the delay. I came across a momentum turbo kit and decided to jump on it instead.

 

No I haven't. With the smaller hks kit I had a different intake setup. The original design wasn't too good and it sucked in hot air from the engine bay.

There would be room for a bigger cone filter, but the HKS mushroom is quite large and well positioned. So I think the difference would be quite small.

 

I was looking at the placement on the installation instructions and it indeed looks like a great placement, reason I've be wondering is I don't really trust foam filters. Also been thinking of maybe spraying the intercooler so I wouldn't want the intake to pick any of that up and if that was the case I would want to create a way to isolate the intake filter if possible.

 

Finally got my built motor together and in, hopefully going for a tune with the higher boost pulley in 2 weeks

 

How'd the tune go?

 

Yea I made it out this past weekend and got it dynod. It made 375rwhp and 374ft lb's at 12psi on 93 pump gas. This is on a dyno that reads notoriously low, so if I were to take it somewhere else it would probably read in the low 400rwhp range.

Power was very linear, it made over 300ft lbs from 3000rpm on, so I am pretty happy as I wanted the car to be linear and responsive. The plan now is to clean up a few things, hit a handful of track days to make sure the package is 100% reliable, then I will likely add larger injectors, a modified factory upper intake plenum with a larger throttle, and go E85 and gun for somewhere around 420-440rwhp on that same dyno.

All in all not bad results, very responsive and linear power, and about 130rwhp increase or so over n/a with bolt ons and a tune.

 

so what r your mods other than the HKS?
Looks like the claimed 500 is @ the flywheel then.

 

Its a pretty basic setup

OEM Heads, Cams, and valvetrain
Wiseco Pistons
Manley Rods
ACL Bearings
OEM Rev-Up Oil Pump
OEM Rev-Up Lower Plenum
OEM HR headgaskets
ARP headstuds

OEM VR38 Injectors
Walbro 340lph pump iirc.

ISR Performance long tube header
ISR Performance Y-pipe
ISR Performance GT Single with a modified mid section for G35 coupe fitment.

HKS GTS8555 kit

I deleted a lot of the unnecessary stuff since its only going to be a track car (removed A/C, removed a bunch of misc coolant lines to throttle and what not, etc.). With E85 or race gas we should be able to add a good bit of timing in it and gain some more power, and then I think the OEM throttle and upper intake plenum is probably a restriction as well. So we'll do some testing and then look to upgrade those two areas and go back to the dyno and try to hit that 420-440whp range. Once I get there I'll probably look at a mild cam and maybe play with porting to squeeze a little more out of it and leave it at that and see if I cant get it around 450-470whp on that same dyno.

 

Heres the dyno with one of the last dyno pulls on the low boost pulley with the restrictor and a stock motor, and the new one with built motor, no restrictor, and the higher boost pulley.

 

I see some jwt camshafts in your future.

 

I really do wonder if a bigger TB will even do anything without increasing the size of the pipe from the intercooler to the TB?

 

I guess it wouldn’t. Best thing to do imo is decrease the length and bends in all the piping, enlarge the piping and then go for the tb all in an effort to reduce pressure drop. I did see other sizes of pulleys somewhere on a sellers website. I cannot remember but they had something like 10 different sizes.

 

I dont think it is so much an issue with the throttle, as it is with the upper intake plenum. Others have tested it pretty thoroughly and found that to be a pretty sizeable bottle neck. If you take it off and look in behind the throttle body you can see it has a pretty sharp over 90 degree bend that also kinks down a fair bit. I've got a spare upper that I've got nearly finished up, I just need to find a decent Bosch or Hitachi throttle in the size I want, make an adapter harness, and finish welding up the plenum

 

that’ll take care of 1 nasty bend.

 

That's why I run the Kinetix, my point was the TB being larger than the piping that goes to it isn't ideal.

 

WTF? Is that an intake topped pizza?

 

Or youcould say eff it and cut a hole thru your hood because you want throttle by wire

 

I understand you want to step your way up to more boost but I was curious, the pistons and rods kept the factory comp ratio or changed it?

Just curious if that also contributed to the bump in power or was it only because of removing the restictor plate and going down in pulley diameter? (110mm to 100mm ? Or 90mm?)

Thanks!

 

I'm interested in your pulley size too. My setup will only produce 10 psi on E85 with mild JWT S2 cams. I dynoed 400 whp.

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