I ran today at Newlexington, Oh. truck pull and made 451.4 hp and 1024.1 tq i was very happy with my ht2b with a 12cm exhaust housing. Cleared almost all the smoke at 40 psi and lit around 1800rpm on the dyno.

 

More Power,
Those are some really good numbers! What kind of dyno was it? What are your 2.2 EDM's rated at? Also, can you tell me what setting you had your Drag Comp on to get those numbers? did you try different settings? I am going to dyno in October on a Mustang dyno again and would like to get an idea of what Comp settings give the best results. I'm hoping to make 400hp. Thanks

 

Congrats on some great numbers! I've gotta ask though, what's the pyro look like with a 12cm at 450 horsepower? That thing had to be glowing to flow that much fuel, eh?
g

 

I can get to about 1300 on 5x5 with the Drag Comp and DD-3's. I only have a 12cm HTB2. you can't compare a Holset 12cm to a HTB2 12cm.

 

Is it a different 12cm exhaust housing, or do you mean the htb2 compressor side vs the holset? Just a little green here, sorry.
g

 

Well when I was ordering a turbo from HTT, Paul suggested the HTB2 (62/12) for my projected horsepower level of ~450. I told him that I was currently running a HX35 w/14cm housing, and asked him if going to the 12 would be ok. That's when he told me that having a 12cm on a HTB2 is not the same as on a HX35. 12cm is 12cm no matter what, but I believe the design of the housing along with a bigger compressor wheel is the difference. That's my take on it. I'll let the experts chime in now.

 

I'm no expert, but the reason you can't compare one 12cm to another necessarily is because the turbine wheels are different sizes.

For example with Holsets, say you have t a 16 housing for an HX40, and housings up to a 21cm housing for the HX35.

An HX40/16 will flow MORE than an hx35/21. This is because no matter how big a turbine housing you put on it, all the gases still have to flow past the turbine wheel. So on the hx35/21, the housing is less restrictive than the turbine wheel.

With the HX40/16, the housing is MORE restrictive than the turbine wheel.

That's why A/R is so much more useful and descriptive than the 12cm, 14cm housing sieze, etc. The Holset system of just listing size in sq cm gives you just the A portion of A/R. So you know the area, but without the radius (a function of the turbine wheel size), it's all but useless.

Under the A/R system, you could see why an HX40/16 would flow more than an HX35/16. With the Holset system, you just see that both are 16 housings, and that's all but useless.

It's like saying-- "man, today is much colder than normal" You have no idea if it's -20 or +60, because it depends on what "normal" is.

Hope this helps clarify a bit.

jh

 

That puts it in perspective, thanks Hohn!
g

 

Which truck were you? Your 451hp run was the highest HP for the day.

We dyno'ed a set of Jammer 5's (rated 155fwhp) in a 2001 truck and they added less than 105 rwhp. Needless to say, there's another set of Don's Mach injectors in someone's future.

brandon.

 

My truck was the third truck on the dyno Silver single cab 2500. I got the highest tq numbers for the day but high hp was 456 out of a newer chevy. The dyno was a dynojet and i ran drag comp on 5x5 my egts on the dyno hit 1400.

 

Neil, You should not have any problems dynoing 400HP... you should be in the 450 range.. I'm a little over 400 with the DD3's and Drag Comp.. on a stock charger..

Brandon.. (JoeFarmer) on the Jammer 5's dyno run... what turbo was he using.. and had the injectors been tested before they were installed??? Just curious...
Bryan

 

Stock turbo, drag comp off. The injectors were not tested before they were installed. However, the truck doesn't idle rough-- I thought that's one way to tell if they are mismatched?

brandon.

 

Brandon... I can't always say that it will idle bad... I put together a set for a friend.. it idle normal with the stock injectors... he had 5 that were low (270-280bar) with the jammer tips in the pressures didn't changed... so we had to reset the pressures...
I haven't ran the Jammers 5's with the box off on the dyno.. but with the box on.. and a stock turbo.. the higher the setting the worst the power will be.. have seen the same thing with some of the Mach (JR's).. (and on the drag strip) once you change to a bigger turbo they really start to shine.. (the bigger injectors..) Nothing wrong with Don's injectors.. they are some of the best out there.. but they are in a different price range than the Jammers... Just seen people complain about the jammers.. and others that just sell the tips.. when they are not setup properly.. and do not have enough air...
Bryan

 

The only thing that was disappointing was their rating. Now, I'd expect them to be rated at fwhp, but 32% less power than advertised?

If this was the case elsewhere, paying $45k for new 325/605 truck would net you 214 rwhp / 399 rwtq on the dyno. Ya get what you pay for...

brandon.

 

FWIW my truck made 417hp 874lbtq with jammer 5's alone, with setup in sig. I never dynoed my truck in stock form, but supposedly an etc is right around 200hp to the wheels.