A Terry and Mike sighting on the same day...

Miss both of you guys around here. Still have the G Mike?

 

Terry I was just thinking about your build the other day. Sorry that this is taking so long, just curious of what other custom things need to be done? I would love to see you get on the road.

 

Hi Chris.. Yeah, I still have the G...thats reminds me, time for me to start it up and let it run for a while

Terry maybe ready in time for the next Zdayz event

 

Custom fuel return system, customized downpipes with the dumps porting back into the exhaust, embedding the HKS displays into the dash, customized wiring/implementation of the meth injection system, custom oil cooler setup, new custom seats (sitting in their store room), hopefully custom harnesses, and some other things. Moreover, I asked that all of the wiring in the engine bay be tucked away from view, everything polished, etc., to make the engine bay look really clean. Japtrix is geared towards race cars, and alot of the stuff for "show" is not what they are used to normally doing, and probably seems like a big PIA to them. Maybe that is part of it.

I just want it done, and done right, and Roger knows that. I have not been too much of a hard *** because I don't want anything to go wrong and I have been too busy with other things this year to keep on top of them.

 

Hi Mike. I'm hoping. It was supposed to be ready for the last two...

I haven't had it so long, it will seem like getting a brand new car.

 

Hi Chris. I've been busy, and coming on to the site just reminds me how much I miss my car. Once I have my car back, I'm sure I'll be pumped and get more active again.

 

I just did the same today, I let it run for about 20min. One of these days it will see the road.

Terry wish I could help, if there is anything on the cosmetic stuff that they do not want to finish up for you let me know. I can't wait to see it.

 

Terry, Its nice to see you back and also have kinda good news about your car.

Mods, please ban Mike until he posts some full throttle high boost vids.

 

This is absolute bullsh|t. No way in hell I'd let a shop keep my car for well over a year with nothing being finished.

 

Ya i dont understand how people allow this.

 

Definitely will be interesting to see closed deck performance on a high whp VQ...

 

thought i would poke my head in here too

 

I've been on both sides of this so I can see how it happens.

Your tech advice is always valued greatly. I feel exactly the same way about my car.

 

WTF!! get you a$$ back in here boy


where iz the updatz?

 

Hope they will put your car first...I am sure they know its good press doing a build of that level



I learned it the hard way letting my RX7 sit for many years without starting it up Expensive mistake.

 

it r coming i've never been one to talk before things happen only after.

-note to thread jack

 

Here is a long overdue update on my car.

First, it took a long time for Roger to finish my car. A lot of weird issues popped up, for instance a dead F-CON. I finally got it back 6 or 7 months ago. There are still some issues to iron out, but we are almost there.

It turns out the .64 A/R on the turbine housings of my GT3071R turbos, and my Greddy exhaust system, are a little restrictive for the combination of the 4.0L motor and C8 cams. At 16 or 17 psi of boost I had 640 ft. lbs. of torque by 4200 rpm, but then it drops off. With the mid-pipe on the exhaust removed, this helped, and we were able to get over 600 whp (about 614 if I remember correctly) around 6k rpm or so (without fully optimizing the timing yet), but still, I want the torque to hold longer.

So, very soon, we will be changing the turbine housings. The .86 A/R version of the turbo has a different turbine, so that housing will not work. It looks like we will be having GT28 .86 A/R housings machined out to fit my turbines.

Also, another issue popped up. I had both the inside and outside of the turbine housings ceramic coated, but maybe I should not have done so on the insides. When the turbos heat up on the dyno after a few full boost runs, the boost ramp up all of a sudden gets delayed. We think the turbine blades in at least one of the turbos is scraping against the ceramic coating when the metal in the turbine housings expands. We won't know for sure until we drop the turbos and inspect them.

The weird thing with the exhaust is that it worked perfectly fine with my 3.5 L motor, C2 cams and Greddy 18G TT kit. It relatively easily made 609 whp. But the fluid dynamics are a lot different with the new setup. The Greddy exhaust is 2.77", but the resonators and mufflers appear to drop down to 2.5", which appears to be too restrictive with the new setup. I now have the parts to put together a custom 3" exhaust system, using 3" resonators and mufflers. The mufflers are Magnaflow, but I don't remember if the resonators are Magnaflow or a different brand.

Other than the turbo and exhaust issues we will be addressing, I'm pleased with the performance of the 4.0L motor. I'm going to need new tires, however. The rubber in my tires has hardened with it sitting so long. At 305 width, they break loose when the turbos spool up on hard acceleration, even in fourth gear... 640 ft. lbs. is fun to play with, though.

Once we get the turbine housing and exhaust issues addressed, we can go for more boost. The motor has 8.5:1 static compression. We measured 7.7:1 dynamic compression (dynamic compression is lower due to the 272 duration cams). With this relatively low compression, we should be able to give it a lot of boost, even on 93 octane. If I can hold 600 ft. lbs. to 7k rpm, we should get over 700 whp. We will see...

My H2O/meth system is not hooked up right now. Depending on how we do on pump gas, we can install that if need be to get further. First, I want to see how new tires handle the power after we make the turbine housing and exhaust changes. If we are at their limits, no use in pushing for more hp. Yes, I can put drag radials on the car, but that would not be optimum for road course use, which I plan on getting back to when we have everything complete.

 

Man back from the dead. Thought you gave up on your car but glad to see everything is coming along. Good luck and keep us updated.

 

^^^

During the long wait to get my car back, I had to back away from thinking about it to keep my sanity. Hence, I stayed away from the forum. Now that it is back, I am feeling much better.

 

Welcome back! Technology has changed - consider swapping to GTX2867s - u will get the spool and top end you are looking for.