For the 7AT guys with FI

shadow85 · 10-27-2016, 04:08 AM

Hey guys running around 500rwhp or thereabouts, did you guys upgrade the 7AT tranny?

I am planning on Stillen A2A SC, but worried about my tranny blowing up. Do the factory trannys reguarly fail with hard driving with FI?

I have read the entire 7AT and FI thread, some ppl say theirs fails some say it doesn't.

Basically do I need to beef up my stock trans if i am aiming for 400-500whp?

If so, do I need something like the whole level 10 7at transmission, or can I get away with just the level 10 valve body, or level 10 torque converter?

And should I also be grabbing the FI flexplate and oil pan spacer?

I am in Australia so I don't really want to ship over a complete level 10 trans from the states, going to cost an arm and a leg if it already isn't going to.

Array · 10-27-2016, 12:39 PM

400WHP would be pushing it, 500WHP it will make it down the street from the tuner before a replacement

I believe somewhere on the site it said 350WHP is safe and most of those who go FI dont push the AT past that number.. otherwise KaBoom, Flexplate & Oil pan will always help the cause but not the power going to the tranny, its still a risk.

As far as the lvl10 AT, I hear that its mainly the Valve Bodies that are popping

Chuck33079 · 10-27-2016, 01:01 PM

It's not the hp, it's the torque. The old rule of thumb was that the clutch packs in 5/6/7 weren't able to handle over 400 foot pounds at the wheels. There haven't been a lot of people who have reported blowing them up, but I couldn't tell you whether that's because not a lot of people boost the 7AT, those that do blow them up don't post about it, or they don't blow up.

future370zzz · 10-27-2016, 01:41 PM

I'm boosted with only a GTM valve body upgrade but I don't boost in 5/6/7 gears. I think winding out 4th gear gets you up to 122mph so that's fine with me.

I also make sure to warm up the trans oil before boosting. Trans still working, knock on wood.

shadow85 · 10-27-2016, 04:53 PM

Well it would suck to dump a mountain of cash into SC A2A to 500hp but not being allowed to launch it, or boost in high gears.

What do I do? Sell 7AT and get a 6M and buy a heavy duty clutch, then go FI?

future370zzz · 10-27-2016, 05:07 PM

I still launch it, just not in 5-7 gear. I guess if you're doing a highway race to 140mph then you would need to build the transmission with a 7AT.

shadow85 · 10-27-2016, 07:49 PM

Ok.

10-27-2016, 04:08 AM	#1 (permalink)
shadow85 Track Member Join Date: Jul 2015 Location: South Australia, Austra Posts: 917 Drives: 15' 370Z A/T AMM TT Rep Power: 24	For the 7AT guys with FI Hey guys running around 500rwhp or thereabouts, did you guys upgrade the 7AT tranny? I am planning on Stillen A2A SC, but worried about my tranny blowing up. Do the factory trannys reguarly fail with hard driving with FI? I have read the entire 7AT and FI thread, some ppl say theirs fails some say it doesn't. Basically do I need to beef up my stock trans if i am aiming for 400-500whp? If so, do I need something like the whole level 10 7at transmission, or can I get away with just the level 10 valve body, or level 10 torque converter? And should I also be grabbing the FI flexplate and oil pan spacer? I am in Australia so I don't really want to ship over a complete level 10 trans from the states, going to cost an arm and a leg if it already isn't going to.

10-27-2016, 12:39 PM	#2 (permalink)
Array Enthusiast Member Join Date: Jun 2014 Location: home.jpg Posts: 286 Drives: '12 Pearly White Rep Power: 10	400WHP would be pushing it, 500WHP it will make it down the street from the tuner before a replacement I believe somewhere on the site it said 350WHP is safe and most of those who go FI dont push the AT past that number.. otherwise KaBoom, Flexplate & Oil pan will always help the cause but not the power going to the tranny, its still a risk. As far as the lvl10 AT, I hear that its mainly the Valve Bodies that are popping __________________ 2012 370z 7AT- ES2 with PSS, K&N Drop-ins, LED's all around, Berk HFC, FI CBE non-res, KW V1's 2003 A4 5MT- The Beater Last edited by Array; 10-27-2016 at 12:44 PM.

10-27-2016, 01:01 PM	#3 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29538	It's not the hp, it's the torque. The old rule of thumb was that the clutch packs in 5/6/7 weren't able to handle over 400 foot pounds at the wheels. There haven't been a lot of people who have reported blowing them up, but I couldn't tell you whether that's because not a lot of people boost the 7AT, those that do blow them up don't post about it, or they don't blow up. DEpointfive0 likes this. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

10-27-2016, 01:41 PM	#4 (permalink)
future370zzz Track Member Join Date: Dec 2011 Location: Bay Area Posts: 555 Drives: 10 Nissan 370z Rep Power: 14	I'm boosted with only a GTM valve body upgrade but I don't boost in 5/6/7 gears. I think winding out 4th gear gets you up to 122mph so that's fine with me. I also make sure to warm up the trans oil before boosting. Trans still working, knock on wood. __________________

10-27-2016, 05:07 PM	#6 (permalink)
future370zzz Track Member Join Date: Dec 2011 Location: Bay Area Posts: 555 Drives: 10 Nissan 370z Rep Power: 14	I still launch it, just not in 5-7 gear. I guess if you're doing a highway race to 140mph then you would need to build the transmission with a 7AT. __________________

10-27-2016, 04:53 PM	#5 (permalink)
shadow85 Track Member Join Date: Jul 2015 Location: South Australia, Austra Posts: 917 Drives: 15' 370Z A/T AMM TT Rep Power: 24	Well it would suck to dump a mountain of cash into SC A2A to 500hp but not being allowed to launch it, or boost in high gears. What do I do? Sell 7AT and get a 6M and buy a heavy duty clutch, then go FI?

10-27-2016, 07:49 PM	#7 (permalink)
shadow85 Track Member Join Date: Jul 2015 Location: South Australia, Austra Posts: 917 Drives: 15' 370Z A/T AMM TT Rep Power: 24	Ok.

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