Hey I have a 2009 corvette ls3 A6 2.56 gear
heads ported
btr cam stage 3
kooks headers and catless x pipe
vararam cold air intake
circle d 3k stall converter

• trans cooler coming ASAP
• have had the build now for a year with no issues other than tranny temps getting over 220+ degrees 3 times
• I have loved everything about it

now I’m wanting to upgrade it even more thinking about putting a 150 shot on it brand new system will be professionally tuned, my question is 5 years down the road what shape will my internals be in, bad or still good? Keep in mind they are stock, will my all motor setup weaken, will my nitrous setup weaken? And how will the trans hold up during all this, also keep in mind this car has never been to the track and it never will be, it will only be sprayed in 2nd gear 40 50 60 rolls, with that being said can someone please help me and give me some professional and honest advice, thanks!

 

I would say within 5 years your internals will be laying on the pavement somewhere. If I could see into the future I would play the lotto tonight.sorry you’re asking a question that can’t be answered

 

First, put a decent trans cooler on it, if you don’t have one already, which I’m assuming you don’t, because I’ve never seen those type of trans tamps even racing my car with a 3600FTI. I have a Hayden #679, and that works great.
To answer your question, if you have the fuel capacity (or if you add a dedicated stand-alone fuel system for the nitrous) and you have the right plugs (stock ZR1 iridiums or NGK 7IX should be fine) a 150hp shot won’t be a problem.
But you need you will make sure that your trans is tuned properly and in particular the shift speeds are adjusted lower on the spray for the 1-2, 2-3 and 3-4 shifts, otherwise it will bang up against the limiter instead of shifting.

 

Thank for the replies and yes trans cooler will be installed with the nitrous, and my tuner is Stephen at ss lsx, idk about transmissions but he is the best in the state on a ls3 tuning, I have faith in him with the trans, He’s done a ton of auto ctsv, with nitrous and heads cam, idk how many auto corvettes he’s done with that type of power, but he’s done a ton of manuals, but my question to you is 5 years down the road with a dang good tune how my internals will be and transmission would be? Thank you!
he says he can hot wire my stock fuel pump
did you have stock converter in your grandsport??

 

5 years down the road you will probably have rebuilt the transmission several times by then.Friend is on his 6th one right now and it needs another rebuild as its slipping in 4th,5th and 6th.Good luck with it

 

The 4th, 5th & 6th clutch pack is the weak link on these transmissions, but with a 2.56 rear gear, 6500rpm equates to somewhere around 165mph in 3rd gear with a 26” tire (@5% converter slip), so I doubt that the OP would ever need to make a WOT shift into 4th in the 1/4 mile.
This BS about these transmissions being “weak” and needing to be rebuilt regularly mostly comes from failures due to bad tuning (including disabling the MAF to run in SD mode, which is popular with a lot of centri setups) and excessive heat.
There are many very good tuners who, in my estimation, don’t know how to tune these transmissions, whereas tuners like Bluecat, subfloor and Pat G seem to have them figured out. The fastest A6 C6 on here runs mid 8s at 160+mph with a stock GM trans in it, tuned by Bluecat.

 

Ci gs, now I’ll never ever take this thing to the track, only 2nd gear highway pulls when sprayed, now I make 478 whp and 449 wtq, so with a 150 shot that would be what 625 whp and 625 wtq, I only race like once or twice a month and that is when it will be sprayed, and I may drive it work on fridays, but just on motor obviously may do a motor pull or two on the way there or back, but only sprayed once or twice a month max 3-4 pulls a night on spray, thanks for the recommendations, but ss lsx is the closest best option I have, what do you think?

 

I sprayed a little more than that on my cammed LS3 and as long as the tune is decent should have no problems with the internals. My car is M6 so cannot comment on the auto trans.

You will need an upgraded fuel pump setup. I ran a 1 gallon nitrous outlet standalone in my engine bay.

 

CI GS-I agree that there are many good tuners out there but they are lost when it comes to tunning an A6.The last tuner that tuned friends trany has had his fathers car run in the 8's with the A6.

 

Yep. That’s a big part of the problem. Don’t get me wrong, the 6L80 isn’t flawless or bulletproof, and the earlier versions had some design flaws which had to be addressed, with updates to the valve body, pump housing, etc. to deal with flaring, hard shifting. The one in my 5700 lb. 2008 AWD Denali is starting to behave weirdly now too, but I have abused that thing so badly over the past 12 years (including dicking around with tuning when I didn’t know ****) that I can’t really blame it on the transmission. I’ve even hit it straight out of the hole with a 150-175 shot of nitrous, too many times to count, and it’s held up. So yeah, they’re not weak transmissions, from my experience. But heat and bad tuning will kill them, quickly. And hard high powered pulls through 4th and 5th will fail that clutch pack. That’s their Achilles heel.
And re what I said before about SD tuning: I have been advised that the MAF must be functional in order for the ECM/TCM to be able to calculate torque input for shift pressures etc. and that disabling the MAF will consequently lead to early failure of these transmissions. When you look at a 6L80 TCM tune and see that amount of tables that control these transmissions, you start to understand how blindly messing around with the tune can cause all sorts of knock-on effects. I do my own “tweaking” (I wouldn’t dare call it tuning) myself, BUT only under guidance from smarter guys in the know, and only making small changes at any one time.

 

I’m only building this car for the street no track what so ever, if it were to run drag strip it’ll run low 10’s high 9’s, it’ll only have 650 whp- 700 whp and now thinking I’m going a&a kit instead of nitrous and going with trans cooler and oil cooler, should be a good tune the guy has done abunch of ctsv and a6 corvettes, it should last a while in my mind what do you think? It’s only been above 210 degrees a handful of times n/a heads cam and converter build, seems fine now, and my 4th gear goes to 180 so I won’t be shifting into 4th ever at full speed lol maybe once just to see the speedo go to 200 mph