R32 Gtr Build In Usa

[reaper]

19 hours ago, HarrisRacing said:

I'm really thinking the stroker geometry and slow top end piston speed must REALLY like more overlap than I was giving it with these small Poncam A's and straight up cam timing. I just drove it again...damn car is an ANIMAL! I can not wait to try another 1/4 mile run in it! I can only imagine what a 3.2 with V-cam would be like!!!

I shall know soon enough. No 8374 this time around though figured even the 9180 was a bit small for 3.2 and vcam so went a 6870 precision. 9282 might be the ticket once its finally released though

[HarrisRacing]

2 minutes ago, reaper said:

I shall know soon enough. No 8374 this time around though figured even the 9180 was a bit small for 3.2 and vcam so went a 6870 precision. 9282 might be the ticket once its finally released though

Heck yeah. Do tell us how it works out!

[HarrisRacing]

Been quite a while. New job...working like mad and went to Washington DC for vacation with the wife and kiddos. Also bought a C5 vette that I'm gutting and building a track car out of. And I picked up an Exige with only 5k miles on it in BRITISH RACING GREEN!

 

 

Anyway back to the skyline...

Getting car ready for an event down here called skyline nationals. I finally got shims and redid my valve clearances. I have all of them identical save for 1. Set the intake at .010" and exhaust at .014" (one is .015"). This should net me better compression across cylinders now. Before I had spreads from .021" to .016" on intake and .018" to .014" on exhaust. Cams still look perfect. Motor looks CLEAN.

 

New HKS timing belt while I was at it and I bought a small CNC mill / lathe combo. First part is a prototype CAS replacement that holds GT101 sensor. It's oak wood for now but aluminum coming up soon.

 

Also made an adaptor and installed GM electronic 90mm TB. This will be controlled by new EMU black ecu...so no more haltech.

 

The ecu also allowed me to increase crank trigger resolution. Now I'm at 36 teeth instead of 12 (limit of haltech platinum). I also installed a high rate GT101 sensor on the crank to replace the honeywell part (which was beyond specs at high rpms).

 

Installed Corvette electronic pedal. Machined a small plate adaptor out of like 1/8" thick aluminum plate. You could easily use a drill press and jigsaw/bansaw.

 

Also installed new bosch knock sensors and now moving to electric fans.

 

Last final drag runs were all 126.6-126.2 mph in low 11 range. Still on US93 octane.

 

Also bought water/meth injection and will be trying to push this 8374 EFR .92 IWG a bit harder.

 

Why all the changes?

1) idle quality...with cams overlapped the factory IAC was maxxed...had to set revs too high. The GM TB will now control all air to engine.

2) rolling antilag. Yes the emu black with electronic pedal and TB will run rolling antilag [emoji4]

3) better boost control. The algorithm IS better in the program for sure.

4) bluetooth logging and remote bluetooth gauge app (no more laptop riding in car for passes).

 

Wiring coming up this weekend!

 

 

 

 

 

[PranK]

Great update!

I'm intrigued by the pedal change, why did you do it? What are you noticing with it installed?

Is that a timber crank angle sensor cover??  

[HarrisRacing]

Great update!
I'm intrigued by the pedal change, why did you do it? What are you noticing with it installed?
Is that a timber crank angle sensor cover??  

Prototype sensor holder for now. Will be aluminum soon. Just testing the CNC mill.

Have not run the car on the new ecu yet so I can't comment on the pedal yet. But the plan is better idle and drivability. Also may allow for CRUISE CONTROL with later firmware update. Allows for rolling anti-lag. Also can totally map pedal sensitivity with a knob from in car to swap responsiveness on the fly later. Also allows throttle blip on downshift.

We shall see.

[HarrisRacing]

Here is the TB adaptor...made it before I bought the CNC machine.

Oh yeah forgot I put SPARCO seats in it.

[HarrisRacing]

Getting close. Finished the conversion of pinouts etc in a spreadsheet and in the emu software. Time to get to wiring! Also should be able to change cam gear settings easier now after milling the bracket.

[PranK]

So clean! 

[HarrisRacing]

Got the EMU black almost all wired in but had to test the electronic TB setup.

Pretty sweet setup so far!

[HarrisRacing]

Getting there! New dyno and drivability coming soon!

 

Anyone intrested in the EMU black should not buy the RB26 adapter. It is for a standard EMU and caused nothing but issues when trying to Wire with it. That being said the electric throttle body idols incredibly well so far and I haven't even touched it yet. The auto tune feature is extremely handy for getting your base fuel correct and seems to get within 1% on the first try.

So soon dyno numbers will be with new Bosch 2 wire knock sensors, water meth injection, and valve lash tightened throughout. Hoping for 700 whp this time.

 

 

[Piggaz]

Have you got a speed sensor? Are you measuring exhaust gas pressure at all? At full tilt, the 0.92 rear end might choke it up a bit.

[HarrisRacing]

Have you got a speed sensor? Are you measuring exhaust gas pressure at all? At full tilt, the 0.92 rear end might choke it up a bit.

Yes to speed sensor. No to turbine. I'm running my cams pretty overlapped...going for bottom end HP.

[Piggaz]

I may have missed it but what was the reasons behind the big single throttle conversion, mate?

[HarrisRacing]

I may have missed it but what was the reasons behind the big single throttle conversion, mate?

It actually simplifies a lot of things. No more idle air control motor external of my intake manifold. When I overlapped the cams real hard I lost vacuum signal and it made the car not be able to idle in full range with all of my accessories and air conditioning going. So the other idea is that now I will have a position knob that I can change sport mode on the throttle pedal on the car as I drive it. I will also have rolling anti lag. I will also have Cruise control!

 

[HarrisRacing]

Things are going well!

EMU black is up and running very well. I ended up cutting 36 notches and doing a -1 on the crank pulley for better resolution and a crank HOME signal. I also machined a new GT101 sensor holder for the camshaft on my home CNC machine and TIG'd it up. Drive by wire works perfectly! Never thought I would like it as much as I do, but the idle...high idle while cold until it warms ups, etc all works GREAT. Got some new numbers on the tune but I think the limits of this .92 housing is about 640 whp. Only could get 636 whp and 515 TQ out of it this time. I think my old numbers are bad. That or my cams are now too overlapped from the tighter shims. I will be dynoing more to get an idea, but full race thinks I should go dual EFR's or slap the 9180 .92 on and see what it does. Not that I'm not happy with 636 whp and the car FLIES, but it made NO more power going from 21-24 psi boost...it's too choked on top end...only gained in midrange...even after more timing and Water+Meth.

Cool thing is on pumpgas and WASTEGATE pressure of 15.5 psi it runs 504 whp! and it REALLY hauls at 21 psi now (AND I GET SOLID BOOST!!!).

Also started on a new sump design that drops in the tank from the top. 2x 460 walbros and a 3rd feeding this sealed sump. It's coming together nicely!

ENJOY! 

[Piggaz]

9180/0.92? YUCK! That combo shouldn't be available and the 8374/0.92 isn't much better! I bet if you were to log exhaust manifold pressure it would be pretty damn high!

Want more power? Get rid of that restrictive rear housing and let it breathe. 

Subboy went from the 8374/0.92 to a 1.05 and gained 50 HP, "target boost" was 200 RPM later. 

It really is an odd theory to have a large cold side that can flow "x volume" of air but then choke the chook on the hotside. You're never going to make the most out of the compressor, so why have it? 

Air in AND out. 

 

[HarrisRacing]

47 minutes ago, Piggaz said:

9180/0.92? YUCK! That combo shouldn't be available and the 8374/0.92 isn't much better! I bet if you were to log exhaust manifold pressure it would be pretty damn high!

Want more power? Get rid of that restrictive rear housing and let it breathe. 

Subboy went from the 8374/0.92 to a 1.05 and gained 50 HP, "target boost" was 200 RPM later. 

It really is an odd theory to have a large cold side that can flow "x volume" of air but then choke the chook on the hotside. You're never going to make the most out of the compressor, so why have it? 

Air in AND out. 

 

Ok...so Twins? All I need to know is the answer..I'll do it.

 

[Piggaz]

Why?

You have everything for a single? The twin kit is not cheap and to be honest I am yet to see solid proof that they outperform a single setup on an RB. 

Where do you want to go from where you are?

What are you chasing for FR to suggest a twin kit?

[Mick_o]

Paul has the data on his 8374 setup and it shows that he was out of turbine with the 1.05 A/R.. Around the 52psi zone from memory... So going up in compressor size when you have exposed the limit of the turbine already really is flogging a dead horse in my opinion. Time to go up a turbine size and enjoy some more torque and a few more ponies! 

THEN if you feel like you want more you'll have the manifold and gate setup that will get the most out of the 9180 compressor ?

[HarrisRacing]

so twin gates....I can weld that up in a weekend. really thinking twins though...the smallest efr are looking strong out to 88lbs min