Why do you care what they say. Just ignore it, they have no impact on your life

 

Geofraphical location is not a factor. I wasstating that because out here we have many shops thatcompete for business vs the amount avail out there.

I know aboout 40 cars in the DC metro area that have been boosted since 05/.

I applaud yoyr efforts but to say VQS are booat unreliable wull need ahuge sample.even my experience and opinion are limites and bias.

Im willing to aid in survey,push mods to help us.
My humble opinion is a Chevy 350 has 50 yeara od R&D,vqs are still under developement,however I lean on its,a great fi platform.

Let me know if I can help

 

Android post suck

 

4shizz I think I got the jist of what you were saying but when u get a chance can you clear that up?

Just wanted to put in my two cents. To say that the Vq is inherently not a good engine to boosting is kinda unfair. The Vq35DeR (what I have so that's what I can talk about) has a high relative compression ratio 10.3:1, vs a stock CR on the 2g turbo 4g63 (factory tuned Mitsu Evo is 8.5:1); is tuned to maximize it's potential from a naturally aspirated setup including cam/valve timing.

I mean in my eyes the argument that is being made is like saying an olympic sprinter is out of shape for not being able to run a sub 4 and a half min mile. It just wasn't geared towards it from jump. Therefore it takes a lil work to make it so and as everyone else is saying, after that point ti's all about the tune. Hell it's always about the tune.

Apples and oranges is what I was just tryin to get at here. Btw that's the same deal with that Mustang handling argument that I had issues wit before. One car may get around a track faster that has very little curves but that doesn't necessarily mean it's the better handling car. it's about HOW it gets around there. How easy it is to take the edge of it's limits and how easy it is to bring it back. In my eyes, the portly mustang will never be able to hang wit the lighter 350 or 370 in that regard. Giving a **** ton of power to any car and put em on a long *** track with relatively few turns and trying to base that as the reason why it's a great handling car is a logical fallacy which would take me alot of time to go into why that's so but please just see it as such.

Anyway sorry for the book. I just hate when some statements are made baselessly.

 

I think this is a fair statement - and I would qualify this. If you were to take a VQ and FI it, you have a few different builds and the result. I will use some examples.


1) Stock VQ with bolt-on super/turbo, perhaps a fuel pump, piping, intercooler. This setup is the most doomed of them all, since the compression ratio will be very high under boost and there is little control of boost spikes, spooling, etc. The VQ was not built to run at that boost, as you say above, wheras a factory turbo will be 8 to 8.5:1. Beat on this configuration and you'll trash it. Most homebrew installs are this.


2) Minor Built VQ - lowered compression using heads, properly large injectors, manifolds, boost controller, etc. This has a long-term chance of reliability. I would say this build is probably fine for a lot of regular drivers who don't beat on the car. A small percentage of 350zs are done this way.


3) Major Built VQ - forged rods, cylinders, specific turbos, header, manifolds, crank, timing alterations, pressurized fuel system, full intercoolers, dual intake, independent MAFs, fully isolated exhaust, over-spec injectors, upgraded oil cooling, etc. etc. There is no problem running a VQ like this and you could make a ton of power reliably. I've seen almost none of these builds on the road, because you could buy a better car for the price.


I think when people say the VQ is not suited for FI, I think they are referring to setup (1) above. The stock form of the engine is not built like a VG30DE.


Speaking of the VG30DE and VG30DETT, there is a lesson about FI from Nissan here. The VG30 engines were solid iron blocks. They had a lower compression. They had forged components from the factory. The transmissions could hold 650 hp. They were engines from a different age of car, and they were overbuilt rather than underbuilt. Would I be comfortable bolting larger turbos on a VG30DE and boosting it? You bet, but even the VG had it's fair share of bolt-on failures (typically burnt valves).

To say that the VQ, with aluminum design and inherent oil blow-by from the factory, is a tough enough engine for stock bolt-ons, is a stretch. It will handle it, but it wears out quickly. That is why it needs some building.

 

Perfect response and thank you.

 

I think its really the DE motor that is the cause of all this. No hate on the DE, I owned a G35 and i loved it but now i have the HR. From what i have seen the DE just cant get the power out so nicely with just bolt on turbos, or bolt ons at that. You really need to put new internals and other crap into it. bolt on turbo DEs dont really run lower than the high 12's it seems. However Ive never seen anything on a turbo HR and what times those usually run so its hard to say but its got to be a bit better since stock for stock its alot faster.