Slammedteggy01

I traded my EK for a 91 CRX over the weekend. The CRX has a B20Z2 block that is sleeved with a blueprinted and balanced crank, Eagle Rods, with 9:5:1 pistons. It has a B16A head, GSR cams, ARP headstuds with upgraded springs & retainers, port and polished. Skunk2 IM, and 450cc injectors. Its currently running 15psi on a turbonetics .57 turbo.. I was wondering what I should see number wise and what I should do for tune wise? Its currently OBD0 so i figured i could get a jumper harness and run my P28, what are some thoughts??

2kdrift

15 psi on what turbo? 15 psi on any turbo sounds like alot for 450 cc injectors. 450 cc supports 250 horses so thats gonna be your biggest limiting factor. i would def run a p28 with a proper tune your maximum power will depend on what turbo u have 15 psi on a t25 is alot different then 15 psi on a t3.t4

Freemananana

iTrader: (3)

He did say it was a .57 trim Turbonetics, not that that is enough information to make a good guess. But I would definitely run it with a tune, no matter what OBD it may be.

Also, I think bench racing is prohibitted here. So the "how much power am I making" threads are frowned upon.

Slammedteggy01

It is a t3/t4, so you think I should get bigger injectors? What size? Any reputable brands you prefer?

Schister66

How much power are you hoping to make? That turbo is limited to ~450whp at max.

Also, what fuel are you using? E85 vs 91-93oct makes a big difference.

Until we know the answers to these two questions, we really can't help you that well. To be on the safe side, get 880cc for 91 and 1000cc for e85

2kdrift

injector size really depends on your power goal but bigger is always better in case you decide to turn up the boost but also more expensive. i would recommend injector dynamics or fuel injector clinic injectors

Slammedteggy01

Im hoping for just around 450 and Im gonna be on 93 octane

dcmatt

iTrader: (7)

get 1000cc injectors and find a reputable tuner in your area. is it tuned now?

Schister66

x2

If you have the cash, buy a set of Injector Dynamic 1000s. Large injectors on pump gas tend to idle a bit lumpy, but IDs seem to buck that trend.

Slammedteggy01

It is not tuned yet but I just ordered a basemap from phearable.net for the meantime and knocked the boost down to 9psi. I plan on taking it too a local dyno tuner thats pretty good friends with my dad. Would those 1000cc injectors hold up even if I was to up the boost to about 21psi?

BLU CIVIC

I'd probably take the head off to make sure it is sleeved unless you're absolutely certain it it. seen a lot of people buy cars/engines that had supposedly had "sleeved" blocks

soaringchimp

HondataS300 all day 8]

Slammedteggy01

I planned on doing that anyways just to make sure, along with quite a bit of other gaskets

Schister66

Since 21psi on that turbo is still less than 450whp (which is what we base fuel injector sizing on), yes they will still work. There's a simple formula to roughly calculate injector size - basically 6cc per whp.

450whp x 6cc (per whp) = 2700cc total flow
2700cc/ 4 injectors = 675cc at minimum

1000cc injectors x 4 injectors = 4000cc total flow
4000cc / 6cc (per whp) = 666whp pushed to the max
**Realistically, they will cap out before that**

This is by no means an exact science but gives you a ballpark idea of the size injector you should use. If you are planning to use e85, you must add 30% to the injector size - rather than 6cc/whp you need to use 6(1.3)= 7.8cc/whp

Slammedteggy01

Okay thats awesome to hear! Im hoping to get my chip this weekend from phearable.net, would I be fine to drive around on the basemap for a while if I dont beat on it until a local shop can get me in for a dyno tune?

TheShodan

iTrader: (14)

I wouldn't. Have another car ready to drive to get to your employment while you get ready for tuning. Or, take your chances.

BLU CIVIC

Schister66

I have to agree with the others. I would only drive it to the tuner...nothing more. Driving around untuned is one of the quickest ways to pop a motor

Slammedteggy01

Okay, so what should I get for a tune management then?

4drEF

Find your tuner, find out what systems they can tune, and then ask them what they recommend to meet your goals.

wantboost

iTrader: (2)

you can't just use a jumper harness and run a p28. the distributor is different from obd0-obd1 so you'd need a dizzy jumper harness and an obd1 dizzy or the car won't even crank

Slammedteggy01

Well I talked to my tuner today and he recommended me to get the S300 for about $600 and then he said a flat rate of $550 for a street/dyno tune. So before I waste all that money I think I might take the turbo kit off until I have money for some Injector Dynamics 1000cc and a bigger fuel pump so I can crank it up to 21psi before I sink all that money into a tune for something thats not even at its full potential. I also picked up a virgin EK coupe today to swap everything over into! So what Im getting at is if I take the kit off could I run the B20 Vtec on my chipped P28 safely WITHOUT boost???

wantboost

iTrader: (2)

you can but expect to lose a lot of economy (mpg), it won't be a responsive motor as 9:1 is low for an NA motor... it'll be a dog to drive around and won't make much in terms of power

there's no real point in tuning an NA, stock cam, 9:1 motor... just use the stock ecu, it will work fine

a lot of turbo guys run their built motors on stock ecus when it's emissions time

TheShodan

iTrader: (14)

No. Run stock until you have it all. Stop worrying about the chip so much.

Slammedteggy01

so just run it on a stock ecu??