Hey guys

Newby here from the UK I run a uk accord type r with the h22a7 motor I'm in the process on getting a T4 turbo fitted running P28 question I have I'm looking to achieve around 280 to 300 bhp is 650cc injectors a overkill or shall I go for 525cc? I have also been offered a set of used Id1000cc

Any advise is appreciated

Chris

 

Welcome to the forum.
500cc is the minimum that would get you there (assuming fuel is gasoline).
But having a little head room is always appreciated.

 

This is also the kind of question you should ask your tuner, to see what he's comfortable with. I'm assuming all three of those injector options are not made by the same company. Injector brand and tuning software are the two things you should always let your tuner pick.

 

im attempting my first turbo build for my 90 crx si question is would I be okay running the stock injectors? my setup is a obd0, sohc zc nonvtech stock mpfi intake manifold stock everything so im not sure what the injector cc are. I will be running a t3/t4 a/r .50 at 8psi.... ps I do plan on getting it tuned to get it running good im only looking to make around 140-180hp range

 

Hey guys

Yep the tuner is well known and the best within the UK I'm sure he be using crome. I'm sticking to stock internals so 280 is probably max running at 8psi so similar setup a corn.crx.. The injectors in mind are FIC 650cc or the 525cc but after speaking to FIC now sticking to 650cc. But I have been offered a used set of ID's 1000cc at a good price with adaptors and get these turned down to run the 280bhp but worried it may run lean

 

No they won't work.

And for your power goal a t3/t4 hybrid anything is stupidly huge. You'll have nothing but lag and no power except for the last few thousand rpm.

Your definition sounds like an eBay turbo but I'm not even gonna start on that topic. That size turbo will do nothing but create surge at your power levels, it's simply way too damn big.

You could make that power on a stock sr20 t25 and have a much much more useful (and practical) powerband.

You need to do some serious research on turbo sizing vs power output.

 

Ok thanks for the heads up the only reason I have the t3/t4 it kit i purchased from another user had this turbo and was advised it ran fine with 8psi

Any heads up on the injector sizes mainly the 1000cc

 

Just been thinking I thought lag is from the size of your manifold I used have a junk cast iron one but now have a stainless steel twin scroll

 

Lag is from a combination of things - manifold design/size, turbo size, charge piping length, etc....

A T4 topmount + corresponding T4 anything turbo is going to mean weeks of lag for your 300hp goal. You would be much better off selling the manifold and starting off with something smaller (T3 miniram) and a smaller turbo (T3/T04e 50 or 57 trim). Otherwise plan to lag, lag, lag ..... hit boost for 1-2k rpms and shift, lag, lag, lag, .....

 

OK thanks for the advise I have a T3/T4 50 is this big or just right?

 

Also I wasn't replying to you, just your thread jacker in an attempt to quiet him lol.

 

But yes t4 anything on a Honda motor is laggy, especially at only 300hp.

Also your turbo isn't twin scroll, simply divided which isn't the same thing... So you won't get the response benefits and flat torque curve that a twin scroll setup offers.

You at most need a t3 turbine side turbo. Like a t3/t04e with a stage 3 turbine wheel.

If you want a broad powerband then something like a t25 flanged gt2860r, gt2860rs, or a gt2871r.

The 2871 would support about a maximum of 430whp while delivering a very broad powerband.

The t4 setup you're using will probably only make power from 5500-6000rpm and up at best. It will probably be laggier than that, especially if you're using a large turbine housing.

And in regards to "works fine at 8psi"... Pressure doesn't determine if a turbo works well... Airflow does.

Running too large of a turbo at low boost can result in large amounts of surge and make the car almost undriveable. Depending on the actual airflow of the motor you might not even be on the compressor map yet.

Bigger isn't better, a turbo needs to be properly sized to the application for it to work, you need to plot your motor on some compressor maps and you'll see what I'm talking about.

 

Great advice thanks

This the turbo I got with kit of someone on the forum I use



Looks like I need to get a T25

 

Hey Chris,

Fuel Injector Clinic 525cc injectors should support roughly 275 whp on gasoline.
Fuel Injector Clinic 650cc injectors should support roughly 340 whp on gasoline.

You can play with other injector sizes, configuring fuel type, fuel pressure, and other variables using the injector flow calculator on our website here: Flow Calculator

If you have any other questions please feel free to ask and we'll be happy to help you out.

 

That is a Chinese eBay special turbo. I wouldn't even bother taking the time to bolt it up.

You need a small t3/t04e, a straight t3 60 trim, or if your budget allows a gt or gtx 2860 through 2871 turbo.

 

Or a stock rb25 turbo, which is basically a 'gt2566' with a T3 inlet flange. It will be prefect for your power goal and spool very quickly they can also be found pretty cheap, compared to $1k+ for a new Garrett.

 

cheers guys that turbo is being returned for a refund ..i'm now on a hunt foe nissan sr20 gt25 turbo or F22master says rb25turbo

 

The rb25 turbo is a step up from the sr20 turbo. It will support 300+whp, whereas the sr20 will do~50hp less. Both are great turbos for street cars and they can be found cheap.

 

Found a RB25DET turbo so I will purchase this now. I want to use a external wastegate is it as simple as removing the internal one from the RB25DET and link up as normal

 

Why go external?

 

No, it's nothing like that at all. You would have to weld the flapper shut inside the turbo.

 

yeah its a crap egay turbo but I was given that turbo from a friend so I figured might as well use it on my stock zc, while I build my z6 and im saveing up for a garrett gt2259

 

just bought this

 

Stock SR20 turbo?

 

description from seller

removed from a skyline gtr rb26. It has a t25/t28 style

It's just had a full rebuild with all new bushes and 360 upgrade bearing turbo spins perfectly. It has got a brand new up rated hardened steel shaft/turbine wheel as the standard is a brittle ceramic shaft prone to breakage.