Doober

iTrader: (5)

Im not super active on the forums but I do browse a lot. Mostly in the classifieds lol. So I just felt like posting my Z build. It's been finished for a couple years and I've had plenty of time to enjoy it, so here it is.

Built by Accelerated Performance. Tuned by Pure Tuning here in Toledo, Oh. Both great shops.

Weiseco 10:1 Pistons
K1 Rods
ARP Head studs
ACL bearings
Koyo Radiator
APS Single Turbo with exhaust upgrade / external WG (pieced together Used from the forums)
DW 1000cc with DW 320lph pump and full return
UpRev Osiris

Some eye candy

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I dont have a lot of pics of the car, but here's one with a friend of mine with his 50th Anniversary Z06. We went to the strip that day.

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And a dyno sheet (3rd tune)

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Here's a time slip. It was the only run I got for the day and I am by no means experienced. This was also on one of my earlier tunes without numbers that I'm at now. I had a TON of wheel-hop and didnt get traction for the first couple gears. The vette red-lighted but I was right on him the whole way.

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Right now the car sits most of the time. Im having some overheating issues. It pretty much only happens when I get into boost. Ive bled the air out of the system I dont know how many times. Ive used the no spill funnel and followed the whole 3k rpm system, but it doesnt seem to help. I can cruise around like normal all day, but if I hit boost, it will shoot right up. Im planning on getting it figured out this spring.

Anyhow, let me know what you guys think.

Doober

iTrader: (5)

Also, any ideas on why my numbers arent as high as some other similar single turbo setups that are around? My tuner says that Osiris is holding me back a little, and that the turbo is pretty much out of breath.

Boosted Performance

iTrader: (14)

Your turbo is waaaaay too small. Get a properly sized T4 frame turbo and you will make a lot more than that. The fact that you are making a lot more TQ than power, and your tuner is telling you that UpRev is holding you back would be great reason for concern for me.

If he doesn't know how to read that graph, and give you good advice, then that would be a big problem.

I would however focus on your overheating problem, that is bigger than your lack of power.

Doober

iTrader: (5)

Thanks for the reply. I guess to clarify, his problem with osiris was that there isnt a very high resloution for tuning compared to a haltech for example.

I definitely agree with you on the small turbo. Im just not sure if it will just be as easy as swapping a new one in without any major modifications.

Highway Riding

iTrader: (6)

Yeah generally more TQ than HP like that historically has shown to be troublesome and can bend rods etc.. in the VQ. At least ur built so in that sense your hardware should be able to handle but def listen to Boosted and get a bigger turbo and less restrictive exhaust setup. What is your exhaust setup BTW? I would read up on older posts with regards to the overheating could be a few things and or lack there of.

Doober

iTrader: (5)

The exhaust is whats shown in the top pic with the turbo, with a nismo/factory muffler on the end. Sounds really good and I like the stock look. I dont know how restrictive that muffler is, but I would be open to replacing it with something better.

iideadeyeii

iTrader: (6)

13.2 with 392 whp/ 445tq I would have left that time slip on the fridge ...like upside down

Also my single turbo puts out about 13% more tq than horsepower. Seems normal

Doober

iTrader: (5)

Upside down? is that a good time or bad? lol

It was the first and only run I got to do and all I can remember is how bad the rear was spinning and hopping in 1st and 2nd. I was happy to be that close to the vette.

thatv35guy

iTrader: (1)

If you're putting out more torque than hp you've probably got some pretty serious exhaust back-pressure at the turbo... seems pretty common on an APS single turbo kit though.

I bet if you backed off the boost a bit you probably wouldn't see much of a drop in whp, just torque.

Highway Riding

iTrader: (6)

+1 same with Turbonetics kits as well

Doober

iTrader: (5)

ive also read about the rubber section of the turbo inlet can be "sucked closed" under high boost . I might look into replacing that with a hard section of pipe...especially when i go with a bigger turbo

iideadeyeii

iTrader: (6)

[QUOTE=Doober;10727978]Upside down? is that a good time or bad? lol

Bad time. On the cheapest 275 wide street tires I ran a 12.9 at 107 with 294 hp 335tq. You should be at a very low 12

Vas_Z33

iTrader: (39)

Nice but I would definitely Save up for a new turbo kit

ogiehooker

COOLING ISSUES-try a maradyne extreme platinum twin 12" fan setup...ultra thin, 3100 cfm...what oil cooler and radiator are you using? upgrade? Evans coolant? Bumper opening size?

Overheating seems to be a huge problem on the boosted VQ's.

Doober

iTrader: (5)

I've looked into upgrading fans. Mine stay on pretty much all the time. But I dont believe thats the problem. Same thing with the evans coolant. I feel like, if I AM having a bigger issue, this would just cover it up if anything.

I dont have an oil cooler and I have a stock bumper.

Doober

iTrader: (5)

whats wrong with the APS kit? other than the fact that ive outgrown my turbo?

Zivman

iTrader: (19)

if you have overheating issues and have gone through a few bleads/refills, you have bigger issues. ask me how i know.

you can try installing an expansion tank and see if that resolves the issue. if not, you are looking at head gasket issues.

normal ARP head studs or ARP L19 head studs? paired with what headgasket?

Zivman

iTrader: (19)

nothing is wrong with it. IMHO it pairs very well with a stock motor keeping mid 300's whp and a slightly higher amount of tq.

not sure I would have built a motor to run it, though I don't know what your situation was.

Doober

iTrader: (5)

spun a bearing and i knew i wanted to go turbo and eventually closer to 500whp.

they are normal ARP studsand if I remember correctly, cometic head gasket

ogiehooker

NO oil cooler? Why not? Z's have an issue with high oil temps...cheap and easy install..just sayin' Stock radiator?

You can't build a high performance engine and go cheap or eliminate other areas, like cooling....I won't waste my time posting anymore....