HyperGear ATR25 Build up and Evaluation thread

From what I have read 270rwk at almost maximum duty cycle, never heard of anyone running 300rwkw on stock injectors before.

 

NO !!! not without melted pistons

 

Ask chili I think it was he who did it ? 272rwkw or something ?

 

how does stock injectors equal melted pistons? lol

 

doesn't provide enough fuel

 

Leaner afr = higher temps

 

12.8 is lean, I had a 12.8 Tune in my sil180 (344rwkws) which pins depends on weather. Most tuners would leave it at 12 ~ 12.5. Your stock is VG30dett is about 10. and most of factory tuned cars are around 8~9.

I was told by a car manufacture executive who said "we are not paying for fuel, EPA's regulation's only up to 4000RPM, and richer mixture won't bring us warranty issues so why not."

Well very true.

 

8-9 afr is silly rich. If your running very high charge temps due to large boost, without fixing the problem of temp you can throw fuel at it. Still rich and not enough air for the charge to combust well.

A stock vg30 isnt 10 and most factory tuned cars arnt 8-9. 8 is off the chart rich and would have running issues. Being a turbo builder im surprised you can say that a car being at 8-9afr will even run well, let alone be a factory tune.

Tuners leave it at 12-12.5 for a turbo car because its on the safe temp side of peak power.

 

Ok my opinion on the stock VG30det might not be accurate. might because I had failed O2 sensor and other issues I had 10.3 full throttle with stock turbos before any modifications done.

The AFR been 9 on full throttle is what I've been told from a OEM Part meeting and this is for a brand new car. I'm not going to enclose manufacture's detail. It is not a Nissan but a sports car you see often on road.

 

Pinging or detonation isn't caused by afr. It is caused by excessive timing for the ammount of fuel injected. Your sil80 probably had stupid ammounts of timing in it to detonate at 12.8:1.

Yes most tuners will keep on the safe side at 12-12.5:1 and right down to 11:1 at high boost and rpm to account for varying conditions in which the car is operated.

No manufacturer will run a car at 9:1 afr and expect any sort of acceptable fuel economy, emmision levels, driveability or service life. The richest the vg30dett maps go is 10.2:1, at higher than stock boost levels they are often running lean due to the air flow limit settings. Your car with failed O2's may have been around 10.3:1 which is irrelevent as it is out of closed loop, most likely caused by a det fault or some other issue.

12.8:1 isn't lean, an engine makes best power at 12.6 generally speaking. It amazes me that you can claim to be able to build a turbo that will do X hp but have no idea about the very basics of what an engine requires to run.

 

Yeah

"It amazes me that you can claim to be able to build a turbo that will do X hp but have no idea about the very basics of what an engine requires to run"

it's sad really, the whole thread is full of guess work, and inconsistencies.

 

I've been through dyno tuning and turbo testing plus engine rebuilding for the past 4 years and its not stopping here. So I know how things works and what you are on about.

I just passed on information from what I've seen on my own Z and what I heard from a OE part meeting. I posted it here as I found its interesting as those are words from a car manufacture's excusive, Not mine. and reasons of why he wanted his brand new cars to run stupidly rich.

that is all.

 

Wrong button lol. Anyway found my tune is kinda crappy as alot of timing was removed. Less than stock in most places. So Karl the man is gonna try fix I up for me.

 

im on boosted stock turbo's and ive had to remove alot of timing from the stock tune as well mainly because it was detonating quite a bit on the track. I'm not suprised you have to remove timing with even more boost from aftermarket turbo's even if they are running cooler air temps (not that i know that much about tuning)

 

This is Part 1 footage of our 344rwkws ATR28G4 S13 drift car at winton last month. Enjoy : )



I will upload part 2 and part 3 tomorrow.

 

by XTC are you talking about me ....


i think not

 

Technically, yes there is. You just need to run silly high fuel pressures. In the realms of 70-80psi. Trim your latency and bobs your misgotten uncle.

I however would not advise this as I have no idea of the reliability or the spray pattern of stock injectors at those fuel pressures.

 

lol. XTC as in XTC Dyno tuning also called Phase autos. They mainly does Ford and Holden Flash tunes, They can flash tune Nissans as well.

 

still wont do it Andy, ive looked into this and did the maths a while back, with the stock rising rate reg, they already run high pressure and can only go an extra 10 or 15psi. which is not enough for a genuine 300rwkw.

I guess technically it is possible on some of the dyno's ive seen printouts from .......

A budget solution ive been keen to look at would be 2 extra injectors mounted in the intake hardpipes, used to be a big thing back in my 4cyl days to run a 5th injector in that way

 

Pmack is running 100psi through stock injectors. His 1/4 speed inditcates 420 moroso hp. That is probalby about the limit of the system I would think, maybe he will chime in and tell us???

I am a fan of the old school aux injectors, just not sure if fuel distribution would be all that great through a z32 plenum.