ok so i know im going agenst all turbo religion be doing some of this but i like to experiment.


a buddy of mine who owns a diesel shop sold me a pair of low miles good condition hx35 Holset turbos. i have a 90k mile LS1 im considering doing this on and if it wont work im gonna throw the pair on a low compression 5.3 in a project car..


what im thinking is WASTEGATES ARE EXPENSIVE!!!!! and these holsets have built in wastegates but they are set for around 20psi to keep the turbos form overspinning. how bad would it be to run them as is and then put say a 60mm 60mm wastegate on the cold side to bring it down to 8psi were i wanna be on this 98 motor. no worry of turbos overspooling because of the stock wastegates. but i dont want to overboost my engine either.

if i run individual wastegates ill weld up and delete the built in ones.

my 3rd idea is to run both manifolds into 1 3'5" hot pipe and thenhave that come up in the biddle of the radiator and then split into 2 hotsides at a 90* curve and into each turbo with one wasteate to regulate... reason i say this is i can get a single quality wastegate for a reasonable price but a pair is kinda expensive to get any kind of reliability out of them.

im also not going to take this 98 block over 8psi even with bigger injectors. all i want is just over 500 wheel and if i can do that with a single ill go that way and throw the other single on the 5.3 with like 20psi and see how she holds it =P

these HX35's are 57mm turbos with a .64ar


also if anyone has any good ideas on RELIABLE 38mm wastegates that i can get a pair for under 300 let me know as ill go that route.

 

Why not just buy the adjustable actuators that exist for those turbos for about 80 bucks a piece instead of trying to cobble something together?

Whats the Cm2 of the turbine housing? Holsets arent usually done in A/R.

How many blades are on the compressor wheels? 6,7, or 8?

The only way your making 500 rear wheel is by using both of them.. and running some big boost numbers. That turbo doesnt start getting happy till 20-22 psi.

I tried breaking 400rwhp back in 04 with one. Made 394 with 140 ci 4 banger and 38 psi of boost... upgraded to the HX40 comp wheel and made 460 @ 32 psi.

 

You could just change the actuators on the turbos' wastegates to an 8psi unit. They're all over ebay.

 

ok cool i did not know that. so to run the car at 8psi i just need a pair of 8psi ones and reference them as close to the throttle body as i can? 12cm^2 is .63ar on the Holset and i believe the hx35's are 7 blades?

and dude your a moron comparing an LS1 to a 4 banger. These things spool VERRY fast and airflow is airflow. i dont need to run crazy boost to reach that kinda power. ive been around a few turbo ls1 cars so im not clueless on this i was just trying to figure out the wastegate portion of it.

and as far as HP numbers. my buddy just made 470wheel on a stock 5.3 with 6psi using a 70mm ebay turbo so a pair of 57mm turbos on an LS1 should easily do 500+ with 8psi

 

Well.. since you want to be a smartass and insult someone trying to help you...

You sir can go screw yourself.

But before you do... you might aught to go learn how to read a compressor map and figure out how to discerne mass flow versus pressure ratio.

 

This post is funny

 

It's getting got in herr!!!!

 

Lol you're clearly the moron here.

 

You sir are an idiot, for insulting someone who knows a **** load more then you.

 

LOL

 

people use waste gates on the cold side. phil did it with his LSX mustang (albeit he did also have wastegates set up conventionally.. still point remains). people also do it to centrifugal supercharger setups. they use a slightly smaller pulley and bleed off extra boost. would work roughly the same way in your instance and would probably be MUCH more consistent.

ultimately... it could probably work and work well. try it, report back. im confident that itd work out.

a major sponsor/builder here did a setup with stock grand nat turbos on a 6.0l and made 600? rwhp with a torque curve that resembled a roots blower. the small turbo idea isnt a bad one but it takes some effort to get it to work the way u want.

 

Just because im in the mood....


12 cm sq is not equal to .63. The 9cmsq housing of the HY35 is equal roughly to about that. The 12cm housing is roughly equal to .77-.82 iirc.

I asked you how many blades for a reason. The HX35 had 3 different wheels depending on application. A 6,7, and 8. The 6 moves 51 lb min. The 8 moves 54 and the 7 is the best of the 3 at 57 lb minute.

 

sorry if i was rude. it just pisses me off when someone tries to compare results on engine x to an LS1 especially when engine x has half as many cylinders. the ones i have are 7 blade. and the .63 is just what i was going off of based on some of the cummins forum guys written responses.

talked to my buddy about it and the internals are too small to manage the boost well enough for low boost. im going to get a used pair of Tial 38mm's off my friends old car and use those. but regardless a pair of 57mm's at 8psi should break 500wheel. if they done im gonna sell the kit and be done with it

 

Airflow is airflow. Air MASS flow Is air mass flow. A turbo only moves X amount of lb/min of air no matter what size engine its on. 1lb minute equals 10 hp approx. If a hx35 with a 7 blade wheel moves 57 lb min... it doesnt make a damns bit of difference if its on 140ci or 325... 57 lb min is all its going to move. And ill GUARANTEE YOU it will make more horsepower on the 140 than it will on the 325 because the bigger motor will put the turbine into choke way quicker than the little motor will.

Yes you WILL HAVE to run "crazy" boost to make that turbo work correctly. Holsets are designed to move air at a higher pressure ratio than other turbos. Why do you think the stock wastegate is set at 22 psi? Thats where the wheel is MOST efficient. Garrett and othercompanies turbos will move more air MASS at a lower pressure ratio than a holset will.

You wont have to run 20+ to make 500 rear wheel.... But ill bet you a steak dinner you wont make 500 at 8 psi. The design of the wheel just does not move the required air mass at that pressure ratio. Find a compressor map of the 7 blade wheel and i'll show you. Itll be in Kg/sec but its easy enough to convert to lb/min.

Have a nice day.... and a Merry Christmas.

 

You arent listening. There are plenty of 57mm turbos out there that can move 28-30 lb/min of air at 8 psi....

The holset HX35 is just not one of them.

The aerodynamics of the wheel are designed to be more efficient at a higher pressure ratio for the diesel application it was originally designed for.

 

thats a rough flow map of a 7 blade



and if thats the case they **** turbos. i cant justify spending this much money on one and 50% of the time people are fixing stuff that dosnt work.

 

everyone says the hx35 7 blade flows about 60-65lbs/min and is compatible to a GT35...

 

Do you have any idea who you're arguing with?

 

Um, what?

 

im obviously not arguing with you. if you dont have any productive information to add please leave. i know twin hx35's with the 7 blade will support up to 1100hp


and as far as my last comment... turbo setups see more down time than driving around time. somthings always not working right on them. constant jacking around with the setup