91 CRX Si Special Edition w/ 93 Integ GSR motor
 

Vehicle: 91 CRX Si Special Edition
Engine: 93 Integra GS-R 1.7L DOHC VTEC
Modifications: - Generic intake pipe and filter
- High flow catalytic converter
- 2 1/4 inch exhaust pipe from catback
- Magnaflow exhaust

Had a post earlier regarding my 1.7 GSR motor in my CRX lacking power, this is what i found. Muffler was plugged, TPS was reading 0.3V - 4.4V, and lazy oxygen sensor. So, replaced the muffler with my old magnaflow one lying around, adjusted the TPS (hacksawed rivets and installed some torx screws) to 0.47 - 4.61 (closed - WOT), and replaced that lazy oxygen sensor with an NTK replacement.

I finally got around to going to dyno to get some base numbers to work with, this is where i figured out the oxygen sensor must be lazy if you look at the light load acceleration at 3 -4500 RPM you'll notice my A/F ratio was about 15:1 and went to stoich as engine management switched to open loop.

Did 4 runs, first run with distributor timing found to be at 14 deg btdc, then adjusted up to 17 deg btdc and found a little gain in HP but a 7 ft lb gain in torque with final results to the wheels: 145.18hp and 114.14ft lb torque.

Now finally after the above repairs, i have a respectable baseline to start with, planning to go turbo, i've purchased a Walbro HO 255LPH fuel pump, B&M adjustable fuel pressure regulator, Hondata s300 engine management computer.

I'm looking for ideas for this build, and any input you have if you have experience with building and tuning as this will be my first build. Also any comments on my dyno chart are welcome as well. I'll be posting future progress and dyno results in the future as well after modifications when i can.

what kind of dyno?

DynoJet

I haven't done a turbo build myself, but I've read that vtec b18's aren't as good for turbo as other b18's because they're higher compression. You may want to consider swapping your pistons for ones that'll give you lower CR (only if you want to boost). According to Wikipedia, your b17 has a 9.7:1 CR, compared with the 9.2-9.4 of the B18A' and B18B's. Maybe that's close enough?

Do you have a cable tranny or a hyrdo one?

Compression is a little high, i'm wondering if i should install a thicker head gasket to lower compression a bit, i'm not planning to run any crazy boost or anything, i just want a little more power. I heard anything over 200whp is pointless with front wheel drive cars, whats your opinion?

It has a YS1 cable trans, it's a pretty rare motor in a rare car, funny how i came about both the car and engine.

whatever person told you more than 200whp is pointless must only make 200whp :chuckles:

Haha, i suppose, anyone else got any comments on 200whp on a front wheel drive car? Keep in mind, this application is for street use so it's not like i can drive around with that thing on the back of my car to keep the front end down.