Hey
just a feeler here, currently doing my build and would like some feedback on the above set up
i just did a fully built 2.4 destroked to 2.1 running a gt35r turbo with a .63 back housing. I am hoping it will break 600whp with this set on e85. Does anyone here have this combination and what was your results? All other supporting mods are there , turbo kit is a top mount runnjng a dyno comp mani.
i am also gonna install a double pumper .
thanks for the feeback in advance .

 

But why destroke a 2.4 to 2.1? 2.1 is more suitable for drag racing and 2.4 is better for daily driving etc. If your goal is just 600whp I would stay 2.4. Also I think that a 0.63 a/r will choke your setup and hurt your power goals. If you move on a higher a/r I am 99% that you will not lose spool at all. You should really try a 0.82a/r vband turbine housing. Just my 02c

 

i will be drag racing the car thats why i choose the 2.1. But yeah i do aggree the .63 back housing will hurt me in the back end. Will probably see if i can switch that out before i do the tune thanks though!!

 

The 0.63 was my limiting factor on a 2.0l setup with 93 octane fuel. Swapping it to the 0.82 allowed me the extra power, and only compromised around 125rpm worth of spool (comparison was done from 3k rpm), however,. i did lose a little bit of response upon downshifts at higher rpm's (don't have numbers on this to share).

 

how much did u make? I am on e85 as well .

 

I made 440 whp/28psi/93 octane on a dyno jet. It was an HTA86 turbo if that makes a diff!
https://www.evolutionm.net/forums/ev...93-octane.html

 

I read your post that must of been a super conservative tune, a HTA 86 should make over 500 whp all day on pump , you were basically making what a FP red would make on pump. If I’m not mistaken the HTA 86 is a 75 lb min turbo so basically around 750 whp on e85.

 

aggree that's low, i hope i break 600whp.i made that power on a fp green on stock block.

 

Guys,
our 93 octane fuel is knock-limited, and a good tuner should always know where to draw the line to avoid unnecessary knock at the cost of marketing high hp numbers.

On the mentioned setup I drove for 50k miles without a single issue. Don't chase the # 's on the stock block because it will become costly!

 

2.4s torque is a drivetrain killer. You will be replacing all the drivetrain components (trans, clutch, tcase, diff) more frequently. Also cause of the piston speed the 2.4 cant rev as high as the 2.1. While the 2.4 is fun I wont argue that the 2.1 is a much more reliable engine.

But as previously stated the turbos AR is going to be a huge limiting factor. 2.1s have been rev'd to 11,000 rpm (I would advise this though unless you are fully balanced and have aluminum rods) with that small of an ar you are choking down the turbo and will have a major restriction up top.

 

I understand we’re your coming from but Fp reds on 93 pump make that power rather easily with out pushing the tune on the ragged edge. I have a built 2.3 so not as worried but tune still has to be good it’s not like a built engine makes it bulletproof to a bad tune. It’s great that that your engine went 50k with no issues!!

 

That tiny turbine housing will choke that turbo up top. I made 720 to the tire on a 2.1 with a gen 2 GTX3582r. The engine was a simple rod/piston 2.1, stock port head, S2's, stock intake manifold and throttle body as well.

 

nice # ^^ yeah i will definitely look for a .82 back housing before i get the car tune.