The stuff I used is a ~1mm - 2mm fiberglass mesh/weave with an foil backing...I think the tape is good but in a heat-soaked engine bay I dont know that the foil tape would do much either.

It may be worth it to try a fiberglass exhaust wrap especially over the passenger side header - I believe this section of intake charge pipe would be the most susceptible?

Another thought would be to fab/install a thin sheet of aluminum as a heat shield or possibly a ceramic coating? I guess its how much money you want to spend and how far you want to take it -

 

I ran into another issue last week. When making a pull the car wouldn't rev past 6000 rpms. I put in a fresh set of NGK LFR6A spark plugs gapped down to .030. That didn't solve my issue. I made several hits with thatv35guy logging my car and it was actually starting to cut out around 5700 rpms. After much discussion, we decided to throw in a set of ignition coils. I should note that I didn't have any misfire codes show up. So this was just kind of a shot in the dark. I picked up 6 oem coils from someone who was parting out their car for a real good price. I installed them and made a pull and the car pulls happily all the way to 6800rpms now. The car also feels like it drives a lot better. The throttle response is nice and crisp, it honestly hasn't felt this good to drive in awhile. So my coils may have been on their way out for some time.

 

Well, on a bit of a whim I decided to pull my turbo off the car. I sent it off this morning to Pure Turbos. They are going to machine out the compressor cover to fit a billet wheel. It has a 64mm inducer and a 88mm exducer. They are also going to machine out the T3 1.06 turbine housing to fit a 66mm turbine wheel. So the turbo will be a 6466. I'm looking to make just over 700 whp possibly a bit more.

Don't mind the cabinet door, I needed something for a hood prop.

 

 

I actually talk with the owner on IG. It's real impressive to see what you guys are doing at the shop. I'm super curious to see what the 6870 will do on a VQ35. There is another Z on the forum that is also using a 6870. The GT3582R was able to make 625whp and 650 lb ft on my setup. But I'm using 8.8:1 pistons and stock de cams. The biggest issue I was running it is exhaust backpressure. With this turbo upgrade I'm thinking I should pretty easily break 700whp. I'm also probably going to do the treadstone tr1245 intercooler.

 

I should have my turbo in my hands this week. I'm thinking I should be able to get the car into the 750ish whp range with the 6466 upgrades. In anticipation of the new power level, I've been debating the idea of swapping out my rear diff with the 3.5 gear for the auto rear diff with a 3.3 rear gear. Anyone have any thoughts? Here is a speed calculator I found.

 

Is the swap worth, the extra ~5mph at the end of each gear?

I mean if you're trapping 100-101 at the end of a 1/4 mile not having to shift to 4th would be nice and you cut off a little time.

Then again turbos do like longer gears to a point.

 

If it was me I would keep what you have. I value a quicker acceleration vs. a higher top end but I wouldn't fault you if you did drop down to a 3.3 - just personal preference.

 

Thanks for the input guys.

With going to the 3.3 I think it would help with some traction issues. Even with the drag radials on and boost by speed the car can still get out of shape at times. And on the street, where the car spends most of it's time, I feel like it might benefit from a longer gear.

From what I've seen if I can get it to make 7xx whp I should be able to trap in the mid 130's in the 1/4 mile. If I bump the rev limit to 7k then with the 3.3 I could get 137 in 4th gear. So for the times that I do make the trip to the drag strip I should be able to stay in 4th and not have to grab 5th.

 

I should have my turbo back from Pure Turbos by the end of the week. Since my goal is to hit 750ish whp I know I need to upgrade from my precision 1200cc injectors, they only flow 1160cc. I think I've got my two options Injector Dynamics ID1700 injectors or Fuel injector clinic FIC1650 high Z. Anyone have a recommendation?

 

Put some 2000cc's in it and never worry about running out of injector again.

 

I can think of two options ...

what TT said and get a set of 2000cc injectors and be done. Problem solved for life.

Or look into a second set of injectors (say in the 1000cc range) and modify your intake manifold to take a second set of injectors and stage them. Obviously a little harder but an option.

I think ID makes the best injectors available

 

Thanks for the input. Unfortunately, I don't think my EMS can drive 12 injectors. If I had the bigger Pro128 I know that one will, but my Pro48 won't. I haven't really thought too much about 2000s. The 1650-1700 should flow enough to get to 1000whp on ethanol. However, I'm going to look into 2000, but I want something that idles nice. And I've heard 2000s sometimes have idle issues.

 

yeah - staged would be a long shot but the bigger builds in the industry are doing multiple injectors ...

yeah, 2000cc injectors will have idle inconsistencies for sure - nature of the beast.

 

I hit 864 whp with ID1300 cc injectors at 100% duty cycle (toned down to 820 to not go that high on a routine basis). You can slightly bump base fuel pressure if you need to (if you have the pump flow headroom). I would not recommend the ID2000, at least for a daily driver. The ID1300 is much smoother from a driveability perspective and you can reach stoich on both E85 and 93 at idle. On ID2000s, the best you'll have is low 13s AFR at idle on 93. You can reach stoich on E85 at 1000 rpms on ID2000.

I have the 3.3 gear and can stay in 5th to redline in the 1/2 mile (165ish). As you pointed out, traction in the lower gears and staying in each gear longer is the true benefit. Don't forget that the true final drive ratio is your tire size though so...

 

Just raise your rev limiter to 7100-7200 rpm. I've got 28" tall tires, the same as your 275/60/15's, and I trap 130 @ about 6800-6900rpm.

You cna shift at 6800 and then just run it higher thru the traps.

 

Thanks for the input guys. I'm still on the fence with the 3.3 rear gear. If I can pick up a rear diff from a junk yard for cheap I may try it out. I think my wife is going to allow me pull the trigger on the FIC 1650 injectors. Thanks to thatv35guy helping to convince her that I absolutely need to spend the $, lol.

In other news my I got my turbo back from Pure Turbos. It's officially a 6466 now. I dropped off the turbine housing for ceramic coating. I'm hoping to put it back together this upcoming weekend.

 

dam that looks purty,

 

I got the FIC1650 injectors. I'm just waiting on turbine housing to be ceramic coated. Hopefully the car will be back together soon.

 

nice ... whats the ETA on the turb?