hi all
Max RPM 7000
Which one should I choose for Sierra 2.0 DOHC 8v ,GT28R,GT30R,GT35R

 

What power level are you going for mate? a t28 will be smaller than the turbo you have already, but maybe you want less lag?

 

I want high-TORQ
I use T3/T4 63 A/R, External Wastegate 28 PSI Boost now

3500 7000 rpm range
I would like a big turbo

I want to with a big turbo, low boost ,high-TORQ

 

Less than 28psi? the turbo you have is quite large for a 2 litre, i had the same on my 2 litre 8v zvh, was a lot of lagg and no power until 4000 rpm, what is the reason for changing turbo?

 

A t34 .48 would give you similar power but much more low down torque and drivability. At28 is a bit small IMO, based on a t25 footprint.

 

I think with a large turbo- 15 max 20 PSI
Sample : GT30R - 3500 7200 RPM - 15 PSI , may be more of a power

1.6 honda civic uses GT35R

 

honda revs to 9000 rpm though and the head flows much better, a bigger turbo may not come in till 4500 or even 5000 rpm, then you will loose low down torque and power, and im not sure it will make the power at lower boost even if it is bigger.

 

small turbo high revs is not enough (2000 RPM 4500 ends)

 

lots of boys use them on yb cosworths upto about 350 bhp, how much power are you making? i think the turbo size you have is good

 

I love twinky ,I do not want Cosworth yb

target GT3076 ,285 cams 450+HP

 

i was comparing power outputs of the engine with the .48 turbo

 

now I use the turbo T3/T4 inlet 50 ex 63 Comes 3000RPM
not enough over 5800 RPM
I'm looking for a powerful turbo, Up to 5800RPM

http://www.streetfire.net/video/ford...st_2079982.htm

 

i'am using a hx35

 

What is the Turbo Spec ?
What is the rev range
thanks.

 

holy fuck, thats a fair sized turbo

 

I think I will be better ,GT3076 with 20PSI Boost (3500 7200 RPM)

 

it's a hybrid hx35 with a smaller turbine should spool it by 4000 rpm . 3 bar of boost if needed i'll run it at 2.4 bar [if i can get it on pump gas]

 

what tire you use ,will grip the road problem
I've had 2.bar boost

 

lol, this is the problem we all face

 

Mickey Thompson Performance Tires


Do you have that uses

 

285cams on a turbo car. std dohc drives std 244 degrees and 10.5 mm lift.

to get low down power then abaut std degrees and more lift. ive mounted 11.55 lift regrind cams on a NA dohc with out problems.


a dohc are not a rpm engine. but a high tourque engine.

last dohc ive made for a friend made 150NA hp with out ajustment and 200nm.
pullede all the way up to 7000rpm

there are a lot of flow to get in the head.

were are you now with HP?

 

shangdon linglons

 

I use stock cams
Just think of 285 cams

stock cam, stock crank with I use 7000rpm 28PSI boost no problem

 

anyone know a cheap place that does turbo manifolds for dohc sierra engines

 

hand made