hx-35 or hx-40

[jdombrow]

hey all, Sorry for the newbie thread, i was just wondering the main differences between using a hx-35 7 blade and an hx-40 8blade with a billet compressor wheel. since both are 60pd a min turbos with just about the same spool up is their any advantage of going with one or the other?

also I's there a Hx-35 7blade billet compressor wheel? Ive got someone trying to sell me one and i didnt think they were made .

I'm basically just looking for a turbo that can do 60 lb/min and both seem like great turbos

also I've read running a divided t3 manifold will increase spool.

what about running a divided t4 manifold? would this increase spool any more?? I also heard some hx-40s came stock with a t4 flange if this is the way to go?

I'm basically looking for max spool. Ive heard running divided t3 manifold can save some rpm's along with using a billet wheel.

and finally if you have a turbo flanged for a t3 manifold, how hard or expensive would it be to change it to a t4 flange?

I got a really good deal on a divided t4 manifold so would prefer to get it as a t4 flange

thanks everyone

-Jeff

 

[1gDSM4g63]

Read this..., you're pretty far from jump into this and expecting plus 500 hp without understand the turbo and other things needed. There are a lot Holset thread you can look into, Holset Turbos, Holset Turbos, PART 2, http://www.dsmtuners.com/forums/turbo-system-tech/274459-holset-turbos-part-3-a.html, http://www.dsmtuners.com/forums/turbo-system-tech/303969-holset-turbos-part-4-a.html, http://www.dsmtuners.com/forums/turbo-system-tech/314629-holset-turbos-part-5-a.html, and http://www.dsmtuners.com/forums/turbo-system-tech/327647-holset-turbos-part-6-a.html.

The 8blade hx35 has a 56mm compressor inducer. This is found on 1995-1998 cummins manual pickups. The compressor flows 52 lb/min according to the compressor map. The bolton BEP housing (0.55 a/r) is enough to push the limit of the compressor. There's several 500whp 8blade hx35 cars out there with the bolt on housing. It reaches 20+psi by 3500rpms in 3rd with 272 cams. Smaller cams would equal a faster spool speed in most cases.

The 7blade hx35 has a 56mm compressor inducer. This is found on the 1999-2002 cummins manual pickups. The compressor flows 60lb/min according to the compressor map and logged results from a member here. The bolton BEP housing with the hx35 turbine wheel do not SEAM to have enough flow to really reach the potential of 60lb/min. But many have logged over 50lb/min so far and seen 500whp. The stock hx35 12cm^2 twinscroll turbine housing is a t3 flange housing. This mated to a NON-divided runner manifold has produced a 132mph trap speed with a full weight 1g AWD. This is about 600whp. So the flow is there with the stock housing if you use a non-divided manifold. The spool speed of the 7blade hx35 is similar to the 8blade hx35 with 20+ psi by 3500rpms in the bolton housing and by 4000rpms with the stock housing with a non-divided manifold.

HX35-40 hybrid:

Keeping the long tradition of the marriage of sportcompact and hybrid turbos, there is the hx35 turbine and the hx40 compressor. It is strongly recommended to use the large bep turbine housing or the stock hx35 turbine housing with an non-divided t3 manifold for this turbo. The small bep housing around a t31 size hx35 turbine wheel is probably not enough to merit any of the hx40 compressor wheel upgrades. 20+ psi by 4000rpms can be seen in the hx35/40 with the hx35 12cm^2 turbine housing with a non-divided t3 manifold. With the large bep housing, spool times are to be determined. But likely similar.

HX40:

The 8blade hx40 has a 58mm inducer and flows about the same as a 60-1 (around 60lb/min) with ALOT better high boost efficiency and spool speed. It is the most common hx40 out there. The small bep housing with the hx40 turbine wheel is plenty to reach the full potential of the 60lb/min 8blade hx40 compressor. 20+ psi by 4100rpms with 272s.

The 7 and 6 blade hx40 is called the super40 and has the 60mm compressor inducer. This compressor flows around 69lb/min. You can get this wheel in billet style (think HTA). The non-billet wheel spools as fast as the 8blade hx40 in the bolton bep housing and has done 653whp at 40psi per the holset results only thread. Billet should spool even faster. The t3 .70 a/r BEP housing slows spool about 400rpms. But reports show a significant gain in flow per psi. So expect more power at lower boost with that turbine housing.

 

[jdombrow]

slowly making it through them. theres alot of info there I've been picking away at it for weeks

was just hoping for some simple advice

 

[Gstclipse69]

I would also like to know if anyone has run or has any opinion on running a divided t4 manifold to the stock hx35 twinscroll t3.
My current plan is: Dark performance divided t4 manifold http://www.dsmtuners.com/forums/ven...rbosmart-45-mm-hypergate-wastegate-combo.html

Then has anyone run a t4 to t3 adapter like this? T4 divided manifold to T3 divided turbo adapter 3/4":eBay Motors (item 110373544558 end time Sep-02-09 18:09:17 PDT)
It seems like a decent idea to me. You would still have a twin scroll setup for faster spool. I kind of like this idea rather than an open t3 to the stock twin scroll hx35. BUT, I dont know if the adapter plate will cause any kind of problems? Any feedback is appreciated.

 

[JusMX141]

I'm basically just looking for a turbo that can do 60 lb/min and both seem like great turbos

HX35 7-blade, .70 A/R T3 BEP turbine housing. At 28psi, my buddy just logged 58 lb/min with this exact turbo on Sunday at the DSM Shootout, and we're pretty sure his intercooler has a boost leak.

Spools as fast as a 50-trim in a similar turbine housing, but once you're on boost you'll forgive any additional lag.