Turbo Comparisson and Recommendations

[my1stgn]

Id figure I would post over here instead of the Turbo section to get more views and more input. I want to upgrade my turbo from stock and I was recommend the Ball Bearing GT6131e Turbo. Was told the stock T/C would work fine and it should be good for mid 11's. Im looking at trying to go low 11's and eventually mid-low 10's but obviously I have to hit 11's first. Mods are below and the link shows the other turbos I was considering. For $1200, what would be the best turbo to get as far as running low 11's and keeping the stall convertor at about the same stall speed (give or take 600 RPM) Any advice would be aprreciated. Also will have 3" THDP, 3" High Flow CAT, 2 3/4" Exhuast, Alky Kit w/ TT Chip. Plus fuel mods below. Thanks fellas!

 

[my1stgn]

Heres the link from my previous post!

http://www.turbobuick.com/forums/showthread.php?t=196261

 

[my1stgn]

Ttt

 

[my1stgn]

Damb this sucks, no replies....... :frown:

 

[HighPSI]

Sent you a PM

 

[Razor]

What is wrong with your current turbo?

How fast have you gone with it?

 

[my1stgn]

I dont thin anything is wrong with my current turbo. Its stock...... but bigger is better (sort of) I was just looking at upgrading and I also have other mods I was going to do (alky, exhuast, MAF Gen II, ect) How fast will the stock turbo take me?........

 

[c&cgn]

Slow down dude.......take breather.......now....run the car as is and baseline it. Don't throw parts at it before you know what it can (and should) do.

There are tons of TR's out there with bigger turbo's and lots of mods that don't run anywhere near as good as my Turbo T - low 12's @ 110+ thru exhaust. You have to get it baselined and then make intelligent mods, one at a time.

If my GN had of ran as good as my T does, with the same mods, I never would have modded it the way I have. These cars run great with just small tweaks. Take them one at a time and enjoy the car.

 

[GNDriven]

The Two Step Program

I did not see a Torq. Converter in your Mod list or cam, head work, IC, which all helps in knowing in order to give good advice on where you might be power wise with a particular Turbo choice.

If you have a very good TC 9" 10" L/NL, 3200 stall minimum,and the supporting fuel, then there are several choices that you can go with.

In my experences, GN guys who eventually see themselves at high-tens, which I think is probably a money catagory, which is around 8k counting tranny rebuild, and all support pieces. It is common knowledge that the Turbo 109 stock block can acheive those type numbers on borrowed faith. Anyway I getting off subject. If you are one of those go fast buick guys, and it sounds like you may be, then I think there is two rational turbo choices in sequence from a stock piece. A 61-63mm Wheel with 009 injectors, and then a 67-70mm compressor wheel with 60# or 72# injectors. After that build a staged motor and educate me on turbos. Now people will tell you that they have went faster with such and such turbo, but it is matter of supporting cast, and how much boost did it take. Anywho, a 61-63 mm compressor wheel is a good wheel for learning how to TUNE, handle, drive, and work on your engine changing head gaskets. This size turbo is forgiving enough to make a few mistakes on, but powerful enough to blow your skirt up and earn some street credit. Then once the learning curve is over and your tired of running 27-30 PSI for an 11.teen, Then upgrade to a 67-70 mm compressor wheel and create enough power to run 10.90-10.50s on 25-27 PSI with alky, until you split a crank cap. Then build a TSM 109 block and run 9.90s. P.S Don't get caught up to whom you should buy from.

 

[my1stgn]

Well the reason I didnt post what ehads, cam and I/C I have is because they are all stock. I have already made a few baseline passes to see where I was at and , well its pretty slow. Also all the parts I just ordered (alky, turbo, MAF Trans. Gen II, ect) will all be installed one at a time, then Ill make some more passes, tune and then mod again. I will probly run the MAF Gen II with the LS1 MAF sensor and a wideband and tune to see what the best time I could get. Then Ill do the complete exhuast (which is on backorder) w/ DP and High Flow cat and see how much time that improves including tuning. Do the alky kit, tune and then install the turbo and see where Im at. But thanks for the info guys!...... so which turbo should I go with?

 

[Razor]

Stock turbo.. until it goes out or develops issue.

 

[VadersV6]

Yeah when asked what your times were, you say "pretty slow". Work on getting it "not slow" first with what you have. Lots of people in the low 12's on the stock turbo. Some have gone 11's.

 

[Razor]

+1 Bigger turbo wont make you faster if you have issues.

If your running in the 11's on a stock turbo.. then upgrading would be natural progression.

 

[my1stgn]

So what time/mph would be good on a m ostly stock car in the 1/8 mile? I havent been to a 1/4 track in a while.

 

[Razor]

Low 8's running great tires and boost.

On street tires, and 15 PSI.. low 9's. fastest stock turbo ran like 7.3

 

[c&cgn]

High 7's would be a mid 12 car in the 1/4. MPh in the 84 -85 range would be reasonable.

 

[my1stgn]

Well I only made two passes in the 1/8 and so far the fastest was a 10 flat...... wayyyyyy to slow. I think my MAF is falling on its face intermitantly so I ordered the MAF Trans Gen II with a WBO2......and a few other little mods :biggrin: