99VetteFRC

So I put a pair of t70's on my stock 4.8l and they seem to be too big. They start to spool around 3000rpm. I am just wondering what size turbos I should go with to get 600RWH with my stock engine and get them too spool earlier? I bought these before I was on this forum and didn't really know what I was buying. Any advice would be appreciated.

denmah

iTrader: (2)

do you have t4 turbos on?

get two 50-57mm honda turbos they will light up quick

t3 of course

TurboMark8

are they the ebay "t70's"? what is the inducer mm on them and footprint? got pics?
And you say it isnt tuned yet? What is your full set-up? fuel, wastegates, boost, etc

99VetteFRC

I don't remember all the specs, but yes they are the ebay t70s and it says on the houseing a/r70. It was street tuned and they come on very hard at 3000 rpm. I'm using 80# injectors and a1000 fuel system. I zero running problems, I just think performance would be better with smaller/faster spooling turbos. When the car is at idle the turbos even stop turning, thats why I think the stock engine is too small for the turbos.

TurboMark8

I beloeve those turbos are ~60mm with a t3 footprint. Perfect size. I would look at the tune. What does your datalogs look like? What fuel? What is your afr getting unto boost? Timing?

99VetteFRC

Unfortunately I bought the HPT basic and it doesn't log. I had the car tuned by someone on the site and it does run great once the turbos start to spool. The wide band stays around 11.5:1 and the tiiming is around 17*.I was told when I first joined and started my build thread the turbos were probably too big. They work they just don't come on till about 3000 rpm. I'll attach a copy of my tune.

Domer

You want a pair of T3 turbos, with nothing bigger than 60mm compressor inducers. Even smaller would be slightly better. Like a pair of GT30s. T3 .82 would work well, and so would .63 if you are more concerned with spool( probably about 300 rpms difference).

Here you go;
http://www.turbosource.com/GT3076R-p/ts1-1-65180.htm

Old school To4E 57 trim would work too

99VetteFRC

When the engine is idling, the blades stop turning. they are JDM t70 serial tbo1104007.