I've got a B16a2 with a BRIAN CROWER 1.9L stroker kit. The block is sleeved with DARTON SLEEVES. JE PISTONS, 8.5:1 compression. BRIAN CROWER dual valve springs w/ titanium retainers. MANLEY VALVES. BRIAN CROWER stage 2 cams. I want to turbocharger to get 350whp. Any suggestions? Thanks!
Thanks to all of you.... looking for more like 400hp-500hp.

 

Disco potato, gt28, gtx28 turbo.

In the future maybe plan on higher compression pistons. And some potential combustion chamber work for safe clearance of the higher comp pistons. better pistons will help you engine make more power efficently. But not your combustion chamber clearance. Also because lf the amount stroke you have, you may need some bigger camshafts to bleed off some of the compression. That low compression isnt gona do you any favors

If all you want is 350whp and no more in the future, looking into the kraftwerks kit. Otherwise email greg at goautoworks

 

Sizing is good that ls joker recommended but look into the newer turbo. Heres some good info





My personal opinion, you'd be silly to go with a gtx28xx over a g25-xxx.

The gtx28xx has been a very responsive and popular turbo for our platform, but the g25 is recent, therefore anyone whom built or bought a turbo for platform prior to 2018 didn't have the g25 as an option.

From Stratified:
- These turbos compare well to the Gen2 GTX2867 and Gen2 GTX3071 making them excellent choices for the 2.0 EB engine.

- Turbine wheel is similar to GTX28 series in terms of size but flows 20% more and is more efficient.

- 0.72 and 0.92 A/R. The smaller 0.72 A/R flows 25% more than the 0.64 A/R of the GTX28 and 10% less than 0.72 AR GTX3071.

- The 660 has similar flow compressor to a GTX3071 but similar size wheels to GTX2867.

- The 550 has similar flow compressor to GTX2867 but similar size wheel to GTX2860.

- The surge line of the 550 is similar to Gen2 GTX2867 and 660 similar to a Gen2 GTX3071. These turbo should not surge on the 2.0 EB motor.

- The G25-550 with the 0.72 A/R should flow better up top than a Gen2 GTX2867 0.64 with similar or even better spool. The A/R is larger but shaft speed is higher and turbine efficiency is higher. We estimate this turbo to be good for up to 450whp at around 28-30psi of boost and spool to 20psi by 3200-3300 in 4th gear.

- The 660 with 0.72 A/R will flow the same as a Gen2 GTX3071 but with smaller wheels and higher shaft speed will be faster to spool than a Gen2 GTX3071 so we should see 20psi around 3800 RPM in 4th gear. Power potential will be 520-540whp at around 32-34psi of boost.

- The 0.92 A/R on the G25 turbos will slow spool by 300-400 RPM. The drop in back pressure will allow an additional 20-30whp.

 

Thanks for the input. I've had all the parts since high school when I got my '99 Si. I was T boned and the car was totalled. All parts and engine went into storage. Now I have 90 crx Hf and can afford to finish the project and want to turbocharge it. I'm learning all this stuff all over again.

 

You'll have to run a bit more boost and will feel a bit lazy off boost to overcome the low compression. Personally, I'd look at a BorgWarner EFR7163. It can easily make 350-400whp, spool quickly, and it's a nice all-in-one package.

 

What is a decent compression ratio to try and add to the bottom end?

 

With modern ECUs (LinkEcu, FuelTech, Haltech etc), e85 fuel, and COP which have all been game changers for running a turbo honda reliably, I'd probably build a 10:1 or 10.5:1 motor. Somewhere around there. That extra 2 points of compression is going to be like 20hp (or more) through the midrange and will really help spool the turbo. But whatever, that's in a perfect world. You already have a block capable of huge power, I'd personally send it as-is. You'll have no problem making 600whp@30psi with a properly sized turbo (big boy turbo) with an engine setup like you have.

Making 350 will be easy - Garrett g25-550, g30-660, or the BorgWarner EFR 7163 and EFR 7670 would all be excellent choices for your goals. I'd probably stick with the g25-550 or EFR7163 and keep it in the 350-450whp range since any more than that you'll just blow the tires out in the first 4 gears (and while that's fun, it's not fast) unless you run drag radials or have an AWD setup. I run a sticky 245 tire on a 15x9 wheel on the front of my time attack race car and with just 400whp it is very traction-limited in lower gears to the point that I run traction control and boost-by-gear to control wheel spin.

 

I love the sound of that! If I went with G25-550 what intercooler would compliment it. It would go into a 1990 crx hf.

 

The problem i see is lower compression will need higher boost pressures. Which means potentially being outside the efficiency zone. Or at the surge limit.

 

From what I've read isn't a let compression ratio safe when running on pump gas?

 

Post the links where you read that. Id bet its from the very early 2000s

 

it probably was. I'm finding a lot from back then. That's what led me here. Trying to get more updated information.

 

Lots to pick from. I use a go-autoworks FMIC which are fine, affordable, and you can get a whole piping kit for any Honda and it's pretty bolt-on. There are better cores out there, Garrett makes some really nice cores for example. I'd stay away from a $50 eBay varieties.eadstoned

 

I will most likely go with the G25-550 so I'll look into the Garrett intercooler. I tried looking for a complete Garrett intercooler, but all I found were Garrett cores. Do they make a compete kit? Thank you for your help!

 

I found someone who can do the necessary welds on the core. Do I look for any intercooler rated for the HP of the turbo?

 

 

So after some research 450hp-500hp is a more honest number. The engine is built for it, so I might as well use it 🤘

 

Be still my beating heart... I love the way you think joker.

You still have low compression pistons... which will require about 6psi MORE boost to make your HP number than a comparable engine built following a 2020 recipe.

 

2020 recipe?
Is lsjoker referring to you?

 

He just means higher comp

 

So this changes things quite a bit. I would suggest something in the 56mm-58mm compressor sizing. But your compression is gona be a complex. You will need something a bit bigger. Bigger because you will be able to throw alot more psi at it. In which you will need with that compression that low and your goal.

Kraftwerks setups are legit for 300-350whp. However for that whp goal, theres a chance one could still get a better powerband. Versus the linear (big NA like) powerband. Itll definitely make the power, but a gt28 or gtx28 would kick the power curve in alot sooner from my experience.

i was recommending the kraftwerks setup for you. But that is potentially unrealistic now, as your goals have changed.

Now, all that being said, not everbody can afford 2700 for a g series turbo. I like my garrett gtw3476r turbo. Next time around im shooting for the gtx3576r