Hi all , just wondering if any of the Honda family have thought of trying these GT37R turbos .

For those not aware of them they are a Cummins Diesel upgrade by Big G of North America .

I'm told they're based on the 72.5mm 78 trim HP series turbine in the big shaft or GT4088R type centre section . There are stages 1-3 using an 82mm 50T compressor , or an 82mm 56T BCI-18 comp , or the 88mm 52 trim compressor from the GT4088R .

I'm curious to see if they make some in between alternatives to the GT35R-TO4Z-GT4088R turbos . The burning question is how well will that HP turbine perform on a petrol engine .

Time will tell , cheers A .

 

I don´t think Garrett makes a BB GT37, they are all bushing turbos

 

I almosted posted a thread like this the other day. I have some feelers out there right now on these turbos.

The GT3788R is out there and has been used on diesels for a fair amount of time. The 78 trim 72.5 mm GT37 turbine wheel seems unique to these ball bearing versions and could make these quick spooling champs. I'm HIGHLY interested in these. They seem very similar to a scaled up GT35R- perfect for a 3-4L engine... I think this just might wind up being the ultimate Supra, RX7, and similar street turbo if somebody starts making T4 turbine housings for them.

Aren't these UHP turbines, not HP turbines? I thought I read that somewhere a few days ago, but can't find it now.

A link to these turbos on Garrett's website.
http://www.turbobygarrett.com/...s.htm

Tim

 

I could be wrong but I think this turbo has been discontinued.

 

you know a GT37R is a DBB T67 P-Trim

 

timg yes I am VERY interested in them as well . I tracked down some pictures of the GT3788R with the turbine housing removed . The turbine is 10 bladed so definately not a P trim . From side on the turbine blades are higher or taller than a P trim TO4 . JCav confirmed the use of the HP series turbines . You can find tem if you search in the relivant section of "The Diesel Place" site .

I'm a bit more interested in the stage 1 and 2 82mm compressors of which he said the stage 2 is a 56 trim BCI-18 (probably similar to trhe GT3582R's compressor) . He mentioned the Stage 1's 82mm 50 trim as bespoke so it could be the bush bearing GT4082's compressor with mods to fit the big shaft BB CHRA or a totally new design .

The turbine housing pics I have show it having 12 tapped holes so you can index the core round 30 deg at a time GT4088R style . The housing itself I believe is split pulsed T3 pattern and some are integral waste gate . The non gated ones not sure but sound like ones from the 88R obviously profiled to suit the GT37 turbine .

I'm hoping they end up being very responsive and offer lower turbine inlet pressure than turbos like the GT3582R . Fingers crossed - we shall see .

Cheers , Adrian from Aus .

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Quickgti1.8t &raquo;</TD></TR><TR><TD CLASS="quote">you know a GT37R is a DBB T67 P-Trim</TD></TR></TABLE>

Yes and no. Garrett's GT37R is NOT a DBB T67 P-trim. The Evo guys use something they call a GT37R, but like you said it's a T67 DBB with P trim turbine. They just picked a name and decided to use it. It's not really a GT37R.

Adrian,
Are you saying that a non-internally wastegated housing is already available? I would be interested in the 82mm, but on a 3.4L engine I would run off the right side of the map toward redline. With the 88mm, I can stay centered on the map from 3000 rpm to 6500 rpm or more (depending on PR). I'm interested mainly because I think the GT4088R might be a bit too laggy for 2.92 gears and I don't want any turbine section smaller than a P trim.

Tim

 

I´ve a Precicion GT3767S with a T3 turbine housing but don´t had the time to test it yet, i´ve heard it is one of the best turbos on the market, it also should be better than a GT35R.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vti2 &raquo;</TD></TR><TR><TD CLASS="quote">I´ve a Precicion GT3767S with a T3 turbine housing but don´t had the time to test it yet, i´ve heard it is one of the best turbos on the market, it also should be better than a GT35R.</TD></TR></TABLE>

Great turbo for big power. Tuned one with a T4 housing

 

That's another one that I looked into, but it seems to be discontinued. Imagine a DBB GT3767...

Tim

 

Precision will sell you one.

 

I called them and talked with them about a T4 based GT3767, but they didn't seem too keen on making any more. Unless I hear otherwise, for now I'll explore options for a GT3788R...

Tim

 

I´m sure that Boosfed or Arturbo can get you one.

 

timg , the GT37R type turbine measures 72.5mm vs the P trims 74.4mm so ~ 1.9mm (0.076") the difference . The trim at 78 vs the P trims 76 would be similar as well .

From the pics I've seen the blades are thinner than the P trims and number 10 vs the P's 11 . I think the story is with turbines that the thinner the blades and the lower number of them there is - the greater the flow and turbine efficiency .

I've yet to see any TO4 turbine maps but there is at least a map of the plain bearing GT37 turbine at turbobygarrett.com , though probably in 84 trim .

As for running off the map that will depend on the engines realistic air requirements . I work on ~ 70lbs meaning 700 Hp worth of airflow but a lot will depend on how efficiently the engine uses its air and fuel , charge temperatures and particularly exhaust manifold pressure and reversion .

I'm told that trying to get the centre of the map airflow wise aligned with the engines torque peak is important because this is where volumetric efficiency is greatest and charge temperature critical . I don't have a problem with using most of the map width wise as long as the compressors efficiency does not fall off too much .

So depending on how much air you want to pump the 56 trim 82mm compressor (stage 2) may be enough . I don't know if I'm fully sold on the 88mm C117 compressor even though it works very well in the GT4088R with the med-large sized AR ratio turbine housings and its larger .72 AR ratio compressor cover .
That GT4067R was an interesting concept but I think possibly the turbine and trim were a little big For the TO4R compressor and the turbine/compressor pressure balance VS rpm were a little up the wall . The P trim seemed to work out in the TO4Z and I reckon the GT37R BB turbine would be even better matched with a good selection of propper turbine housings in a reasonable spread of AR ratios .
Anyhow until someone swaps the P trim for GT37R turbine we won't know .

I can double check the available turbine housings for the GT37R but busy ATM till mid next week .

Cheers Adrian .