z28adiction

iTrader: (1)

I was just wondering how these kits compare to each other. im pretty set to buy ls1speeds twin kit, since there power numbers are great and tehre kit comes with all top quality hardwareThey seem to be one of the best in the buisness too. But i just came across the APS kit jsut wondering what your thoughts were on the kit

Mr.MartyStone

iTrader: (12)

LS1 Speed kit. It will make more power and has been proven time and time again.

Marty

z28adiction

iTrader: (1)

This is what i was thinking thanks

qqwqeqwrqwqtq

Fwiw our street twin turbo system is not currently for sale. We're in the process of having our manifolds duplicated in cast iron as we've (unexpectedly) had 2 of the fabricated manifolds crack.

Q8CamaRo

iTrader: (4)

Speed INC. ofcourse.. i hope they will get the street twin turbo kit with the cast iron manifolds relased ASAP

Fahad marei

onfire

iTrader: (17)

For pure power compare the compressor maps each will support.

z28adiction

iTrader: (1)

intmd8 thanks good to know. but im not in any hurry to purchase it. still in the process of saving but good to know the problem was foind and has been taken cae of.

JMBLOWNWS6

iTrader: (17)

I honestly wanted the speed inc kit but just didnt have enuff $ to do all I wanted to do.

z28adiction

iTrader: (1)

yea i knwo how htat goes it will take me a while to save to do waht i want to do. Just the average forged 370 sportman with ls6 intake manifol with afr heads and a nice soud turbo cam to go along with it. out through a strange dana rear end.

DanZ28

iTrader: (5)

If not for the manifold issue, I would have Jim's kit on my car already. Jim was alomost done with my Kit when the manifold issue came up and was very forthcoming with the issue and gave me another recomendation.

Funny how two other similar kits came out after Jim built this kit ...

Dan

tt427ls1

I would go with speed inc also. Seems like a great quality kit with name brand parts.

z28adiction

iTrader: (1)

Yea all the parts in teh kit are top quality name brands adn teh turbos are highest quality ith the upgraded ones.

Big Bird WS6

iTrader: (9)

ok. why is the only questions none of you say why you would do a speed.
so please someone say why

Screamin_Z

iTrader: (2)

biggest reason is the turbos, LS1 Speed uses bigger ones...I believe GT35Rs and APS uses Mitsu 20Gs

IMO best kit for TRUE street cars who will not use the GT35Rs to their max then the Mitsu 20Gs will do just fine. intro price of 5500 APS kit vs. 8500 for LS1 Speed.

Mistu 20Gs will be able to support 400-500 hp each

GT35Rs will suppord 500-600 hp each I believe

pssonu

APS uses Garett Gt30rs for 350z's, so I would assume, that they use Garretts for the LS1's.

Does the LS1 Speed kit use external wastegates, or internal?

The 35r's, will support just over 600rwhp.

Screamin_Z

iTrader: (2)

if u go read in APS's thread about the TT kit for the LS1 (GTO, C5 and F-Body) it says they use Mitsu 20Gs.

page 79, post #1567

C5, GTO and F-Body use Mitsu 20Gs

C6 uses DBBs

C6 Z06 uses GT35R DBBs

TNTramair

iTrader: (15)

I dont think quality is an issue with either kit...both kits appear to be of the highest quality. what it comes down to is what are your goals?? APS is a great street kit for running in the 600-800+rwhp range....speedinc's will no doubt make a lot more cause of the bigger turbos. the last thing...the price tag. i love Speedinc's set up but just dont have the coin to drop on it.

my opinion....you cant go wrong with either kit...but speedinc's will make more power.

pssonu

Wow I didnt know that. I wonder why they would you Mitsu., knowing they are older in design and typically less efficient! On another note, why would they use Garretts for 350z's and Mits. for Ls1's. That doesnt make any sense. What about the external wastegates for the Speed kit? I wouldnt use internal wastegates for over 6-700hp, especially on your V8 applications.

TNTramair

iTrader: (15)

I think it might have to do with the space restrictions...mitsu's may be physically smaller i believe...someone can correct me if im wrong though.

wannasupra

the mitsu's will support maybe 500 on race gas, where the 35R will do that easily on pump. there are a couple SRT's that have put down high 600's, low 700's with a single 35r, and one cat with the AMS kit put down 792 at the wheels. keep in mind it's a 4 banger. even if you used twin 50 trims which are much smaller than the 35R, you'd have the capability to make 1200 whp from a v8.