cougar

In looking for a suitable towing turbo for my 92, I ran into differing nomenclature for exhaust housings. I'm use to Holsets use of "cm"'s and have a good idea on sizing, but how does aspect ratio translate? I'm currently running an H1C with a non waste-gated 16cm and a GDS 60mm turbine side. Not enough air to clean up enough my 7X.010 injectors. Not looking for turbo recommendations, just a comparison between cm and ar.

Thanks

bigragu

Hey, Cougar, I'm not trying to deviate at all from you original inquiry about aspect ratios, not at all. But I'm curious, as to I do not see any intake air upgrades on your sig. have you tried upgrading to a Powerstroke intercooler and larger intercooler pipes yet? To feed that extra fuel?
Also, another suggestion, based on recent tid bit info I've heard and experienced with my previous DAP 5x12 VCO injectors- mine started hazing really really bad. Like eye and nose irritating. The promises of no haze and better mileage I got from DAP were untrue, as my mileage suffered greatly and smoked bad. It was nasty, and I like the smell of diesel exhaust, lol. Found out mine, and other complaints I've read, that their injectors drip, causing unwanted and unnecessary smoke. Even with my upgraded charge air intake to a larger intercooler and tubing, those did not help.

PM being sent to you.

gyman98

I’ve never seen the use of aspect ratio in turbos but it would have to be used a comparison. Ie if the intake housing was 25cm3 and the aspect ratio was .75, the exhaust housing would be 18.75cm3

cougar

I was going to do the PS intercooler on my 91.5, but it turned into a bigger hassle than I was able to deal with on my own. Besides, the truck was running just fine without it on the big HTT turbo.
I have an idea what I want to put on my 92 to aerate the 7X.010's, but when all they give you is an ar number for the hot side I don't know how to compare that. Will it be so big as to cause a delay, or will it be so small it drives the EGT way up even though it does spool fast.
Among the candidates I'm looking at is an HX40 hybrid with a .82ar hot side. Holset Hx40 62mm By 86mm T3 .82 Turbo | eBay

u2slow

A/R stands for Area/Radius. Its common to see Ford (garret) turbos referenced this way.

https://www.turbobygarrett.com/turbo...housing_sizing

A certain AR value can be achieved on many different ex housing volumes. The actual cc size is only comparable amongst similar sized turbos.

Hope that helps...

cougar

Yes, a little. But insufficient information to make a comparison. Example; how would a .82ar compare to a 16cm on the average 6BT?

u2slow

Exactly. AR is a ratio, and cc is a quantity. You can't compare those values.

You could have a .82 AR turbo on a 72L/2000hp marine engine that a 6BT couldn't even begin to spool. Such a turbo could be physically 5x the size.

MrFusion

Look at some of the DSM or "tuner" forums and you might get a better idea of similar performance characteristics expressed in A/R vs. CM2. Just a warning: your eyes will probably cross and your brain WILL hurt.

cougar

Would there be any advantage to increasing the turbine wheel size and/or blade count along with the 62mm compressor wheel? Looks like I can get a 64mm turbine wheel from BAE. So I could mod my H1C to 62/64/16 for less than $500.

u2slow

I don't have any experience modding the H1C. Used HX35s have been so affordable it never made sense.

FWIW, the broad consensus is the 7-blade HX35 outperforms the 8-blade one.

MrFusion

I modded a WH1C with 14cm2 turbine housing and a Gilette Diesel Service 60mm compressor wheel and housing. Unfortunately I haven't run it more than up and down the road because the my rig is still in the project phase.

1972RedNeck

As mentioned, A/R isn't really "convertible" to CM^2 or vice versa. On S300 frame turbos, .7 A/R is about 12 cm and .8 is about 14 cm. This cannot be readily transferred to other turbos as A/R is dependent on wheel size as well as housing size.

If you want to get your setup burning cleaner, you need to go tighter on the exhaust side. VE pumps fuel hard down low and tapper off up top - therefore you need a turbo that can spool hard down low. The cheapest way to get this would be to swap on a 12cm wastegated housing from an HX35W.

The best affordable option would be to upgrade to an HE351CW. 9cm undivided exhaust housing will spool like lightening and the better designed wastegate helps keep things cooler.

The compressor has a 60mm inducer as does your current setup, but the exducer on the HE is 86mm whereas yours is only 82mm.

I have ran the 60mm compressor upgrade on an H1C along with a 16cm housing. It was a fair bit better than stock once planed out and pulling hard, but spool up was only marginally better than stock. I switched to an HE351CW and saw huge improvements in spool up as well as greatly decreased smoke and lost another 200* on the pyro from my "upgraded" H1C.

Take the $500 from "upgrading" your H1C and put $3 - 400 of it towards an HE351CW.

johnh

Asperct ratio????????????????????????????????????

cougar

Is the HE351 a direct bolt on?

1972RedNeck

It has a T3 foot so it bolts right onto the manifold and the drain line hooks right up as should the pressure line and intake.

The exhaust outlet is larger (thus enabling the wastegate to work more efficiently) so you will have to do a little welding and the charge pipe will need to be addressed as well.

It is by far the best "bang for your buck" turbo upgrade out there.