71 chevy

iTrader: (18)

I have two master power t70s, .68 AR and a 5.3 lm7

what cam would I need to get to use these, and what rpm range would I be looking at.

I know, they are way too big but its what I could afford.


alternatively, are there any turbos under $700 that would be better suited? Im thinking around a 60mm

cbr600rx7

iTrader: (12)

A lot depends on what your trying to do with the set up. If its a street car i would keep it low around a 228-232. However i dont know if twin T70s are going to be the best way to go on a stock bottom end.

71 chevy

iTrader: (18)

its a 100% drag car.

is it possible to sleeve these turbos to make them "smaller"?. I think I read something about that on the bigger t6 turbos.

Fireball

iTrader: (21)

sleeving them makes the inlet smaller, but you still have the same inertia/wheel characteristics so it won't do a thing for spooling.

spooling those with a small motor is probably going to take a cam thats quite a bit advanced to maximize lowend torque. compression will definately be your friend here too..

71 chevy

iTrader: (18)

hey, thanks for the input.

tbh, im not too worried about the spooling as it will be on a t-brake. what has me scared is the fact that it looks like(using an online calculator) it will be behind the surge line, which could be disastrous to the motor and the turbos.

do you know if sleeving will pull back the surge line?

the compression is stock 9.4 and the gas is e85

I would like to keep the rpms below 6500. I feel like even with a huge cam I might be better served going to two smaller turbos

turbo'd stang

What converter are you going to use?

You are going to need to build boost on the footbrake, before you ever get to the transbrake. Once you go on the transbrake, you need to be ready to leave the line.

The cam and converter need to work well together. What works well together.....thats were peoples experience comes into play. Pick someone and go with their receipe.

71 chevy

iTrader: (18)

thanks man. the converter Im using right now is about to be sent back as it only stalls to 3200 rpms and im thinking I will need something that stalls to 4200 or so.

the problem is I cant find any twin t70 5.3s out there( which makes sense because its not a good combo imho.

turbo'd stang

Try the converter....it will give your converter guy something to work with.

98Z28CobraKiller

iTrader: (17)

If it's a race car, you can make it work. It'll probably cost you more than just starting out with more cubes though.

Fireball

iTrader: (21)

you better do alot more research...just doing what you said is a major mistake. 4200 NA stall will blow thru the converter something fierce in boost.

71 chevy

iTrader: (18)

I think I should just get a 6.0 and copy tirefryin-s10s build

boosted LT1

iTrader: (3)

I am considering upgrading my Ebay T70's to twin MP70's on my drag car. It is a 377 LT1 with Twin T3 (T70) 232/234 solid and stalls to ~3000 on footbrake and gets boost ~3200.

With two step I expect to get boost at launch and the MP70's I think will bolt to the Ebay turbine housings and give me a bunch more up top. In the 1/8 th the Ebay turbo's hang but the motor has alot more than they seem to supply. I think the end of 1/8 th will pickup since the Ebay T70's I think run out before the end of 1/8.

The setup has only been to the track a couple times and did a 6.11 @114.97 (2800 lbs race weight)

Just some data for you to consider.

71 chevy

iTrader: (18)

thank you for the data. what are the specs of the ebay t70 compared to the master powers? at what boost level did you get a 6.11? and how are the turbos holding up

boosted LT1

iTrader: (3)

Ebay turbo tend to be what they send you...I will send you a link in message I don't think they want ebay linked on site.

Master turbo is a FAR better turbo, they will make more power and last longer. You get what you pay for sort of thing. The turbos are cheap I mean they sell them for <250 to your door and do it all day so they are making money.

A friend also uses them and he had them on for a couple seasons the bearings seem to give way but also might be that we pull more than we should through them.

I sized my system with them so im ok with it. Also IF the T3 turbines fit on the MP it will be great. I will check in next couple weeks.

I didn't max a 2 bar map so <14.7 psi was my boost. With two stage meth (M7 and M10) I run ~ambient IAT at that boost in 1/8 I actually get cooler going down track compared to launch IAT

71 chevy

iTrader: (18)

thanks for the data. I just looked up the specs of the ebay t70 vs the mp70 and it seems the compressor side is bigger. 73mm vs 69.09 for the master power, so that gives me hope.

but, you have a lot more cubes, which switching to a 6.0 would fix for me.

do you have any N/A power data on your 377?

we have a lot of similar aspects. weight is around 2800 for me, same tire, water meth injection, similar stall,same trans, so your numbers give me something to shoot for.

what rpm do you see full boost at?

boosted LT1

iTrader: (3)

I will have to find data file as I recall I cross into boost ~3200 - 3500 and hit 12 ~5400 (not sure I hit max in first will need to locate laptop it is on and verify).

In first boost came on slow next time I will have two step so I expect to have boost at line. Second is when the car makes power it carried the wheels through second but the gear is really short I'm in drive forever

TurboS10

iTrader: (12)

2 GT61's from Forced Inductions are less than $700 each.
.81 ptrims should but you in the 9's easy. They will support 1200fhp.
Bore the 5.3 to a 5.7 when it breaks and put a 224ish cam in it.
T70's need ported inlets to run on the "small" motors.

71 chevy

iTrader: (18)

cool dude, so a 7000rpm cam will really scream

boosted LT1

iTrader: (3)

Seems to me Nelson racing makes 1200 - 1500 whp and has small cams I seem to recall he uses a ~228

So high hp has been made on boosted motors with small cams. Also smaller cam gets it done with lower rpm which i prefer other like hi rpms

71 chevy

iTrader: (18)

I did not know that. maybe I should sell my t70s and go that route. thanks for the head's up.

what do you mean by "ported inlets"

edit: dont see this turbo on their website. do you have a link?

Im not opposed to a small cam at all. I just dont want a cam that dies before the engine is in full boost.