EvanZR1

Dropped my 2013 GS off at Quality Motorsports in Dallas (Lewisville) yesterday to have an A&A kit installed. Blacked out V3Si with cutdown Dewitts radiator with integrated oil cooler. Car is bone stock other than LS7 exhaust mainfolds and put down 407RWHP with the LS7 manifolds. Hoping for 550-560 RWHP on pump gas (93 octane here in TX). Car is just barely over a year old with about 9K miles on it. I resisted for as long as I could, but a year was about all I could take. I'm hoping I can last about a year with just the blower, but my long term plans are:
Stage 1: A&A V3Si - target of 550+RWHP
Stage 2: Meth kit and retune - target of 600+RWHP
Stage 3 (optional): Fuel system, pulley change & possible blower cam - taget of 650-700RWHP
I really don't plan on wanting more than 600-650RWHP, but if I ever do feel the need:
Stage 4: YSI upgrade
I'm hoping I can last about a year between my planned stages above, but we'll see how that plays out.
The main use of the car is street use, and it's only driven on nice days. I am planning to start doing some standing mile and/or runway events, but don't really plan on much drag racing. I might also do a road course event here or there, but probably no more than 2-3/year (if that).

So any recommendations or suggestions?

jon6.0

You sound like a dude that will want more power. Don't get the Si blower. Get the Ti. That blower will support 800-850rwhp.

Corvettinator

I'm with Jon. Why not do the YSI now and just use a large pulley and super-conservative tune? Then, the later upgrade will be much cheaper just by pulley swap(s).

Anywho, good luck and let us know how it goes.

TT32VGT

Ya, def do the t trim now.. I would think the t trim would make more power down low vs the ysi.. all about efficiency range, right?

Unreal

Ysi now if you ever plan on going 700+. The downsides of doing it later outweigh the cost savings now.

That or do a Ti trim which is good for ~850rwhp which is the most I would ever want out of a vette.

EvanZR1

A few reasons for going with the Si:

• I really want the blacked out look.
• While I will probably want more HP, anything over 600-650RWHP will be very hard to use on the street.
• Cost: If I do the YSi now, I might as well do the 8 rib setup as well, which would be $2K+.

I really don't need anymore than I've already got. I'm hoping I'll be satisfied with 550+ for quiet a while, and by the time I get bored with it I may find an additional toy to play with. I may think about the T-trim, but from discussing with my tuner and the research I've done on here, it doesn't look like there would be a huge difference between it and the Si for my plan other than extra low end, which I really don't need.

Unreal

Do the Ti trim. They come in black too. Worst case powdercoating it is super easy.

I would never touch a Ysi without a 10 rib cogged DD setup so add $1500 or so to the Ysi if you ever want to do that.

EvanZR1

Was not aware the Ti came in black. I'll call tomorrow morning to ask about it.

Silver Bullet C6

If you choose to stay with QM, ask them what your air/fuel ratio is throughout the tune and at what % your injectors are...they left my car very lean when they did my 1st install/ tune. Others have had similar issues.

EvanZR1

What A/F should I be looking for?

needcheese

Please, keep us updated with the results.

jon6.0

On a boosted motor with no meth on pump gas I like to see 11.4-11.7:1. If it's over 12:1 that's too damn lean in my opinion.

Corvettinator

At least until they come out with that AWD conversion kit.

I'm actually considering the switch to Ti right now. Why pay more later, when you can just start with a larger pulley and pulley down?

Detoxx03

I would never bother with a si just go straight to ti

needcheese

The higher the first number means there is more gas (rich).

jon6.0

Just so I'm clear on this are you trying to say 12:1 is richer than 11:1? If you are, then you are backwards.

EvanZR1

Thanks, I knew lower number if richer, but it's been quiet a while since I was doing tuning. It's been probably 10 years, and I was working on my 88 944 Turbo. Plus I was running non-ethanol blend 93 octane, and if I remember right I was targeting 12-12.5:1. But then that was a fully forged motor with low compression designed for boost. I know the last N/A cars I worked with tuning on we targeted about 12.5:1 on non-ethanol blend 93 for best performance. The suggested 11.4-11.7:1 sounds very reasonable, my only question would be should I adjust that any for the ethanol blend we have to run in Texas, and if so how much and which way?

Pitufina

Personally, I would feel safe anywhere between 11.1-11.5. Above that I'll feel leery about it. Even n/a LS3s seems to run better 12.2-12.3. Just my opinion.

needcheese

Your are correct and I am wrong. I misread some research I was doing.

jon6.0

No worries dude. That's why these forums exist.