A couple months ago a customer of ours had a super-clean late-model Integra GSR for sale. Knowing the car's history and the condition it was in, Bill (my father) decided it would be the perfect project car to ****** up for my younger sister (a high school student) to drive.

Long-story short, the engine was a tad tired. It had almost 180k miles on the clock, and had begun to use a copious amount of oil. The engine was completely bone stock, with the exception of an off-the-shelf GReddy cat-back exhaust.

Here's the car:


And the lovely stock engine:


To alleviate the oil consumption, we planned to rehone, and throw a set of pistons/rings in the engine. Before doing so, we also wanted to see what kind of power the stock engine with a catback exhaust made.

Here's the results of the stock B18C1 engine, with a catback, with all accessories:

137whp / 110wtq



As you can see, it's nothing crazy, by any means. So, instead of just throwing a set of OEM P72's back in the block, we decided to make a couple more changes...

To be specific:
- Nippon P73-A0 pistons / rings
- Blox Type A camshafts
- Professional Products intake manifold
- IMW-Spec B-Series Narrow race header
- IMW-Spec test pipe
- IMW-Spec custom 3" aluminum cold air intake system
- Tuned with Neptune

Here's the results.



And the dyno plots:

After it was all said and done

168whp / 121wtq

And the comparison


As you can see, the difference up top is substantial. The general consensus regarding the deficit of torque in the midrange could be a result of the lack of adjustability in the cam gears, the lack of runner length compared to the longer-runnered GSR intake manifold, or possibly the length of the intake arm. Regardless, a solid gain of 30+whp / 10+wtq was seen with a mild bump in compression (11:1 now, up from 10:1), and a very MILD camshaft (that utilizes the stock valvetrain even), and a 2.36" exhaust.

Unfortunately, the ground is covered in snow currently, so I don't have a review in the difference from my poorly-calibrated butt dyno, but as soon as it clears up, I'll be sure to add some commentary.

Thanks for looking!

Derek Robinson
InnovativeMotorWorks

 

Very cool derek...even though this is a mild simplistic daily driver build, it takes you back and lets you reflect on how much has changed. 5 years ago this would have been a fairly aggressive street car build lol
How are the welds? Cant see painted black... you might be tig'in up some 3 in'' intercooler piping for my s2000 build soon ; )

 

Agreed, it's amazing how things change so quickly!

Here's a crappy cell phone pic of the intake after welding, but before coating.



- Derek

 

thats whats up derek clean *** gsr. my hatch is still runing strong after john tuned it..

 

thx man for this test.

 

Hey Derek! You can see the 4500 rpm hump from the intake, I'm thinking some cam gear tuning might take that dip out of the middle. Thanks for posting the tests

 

Saw the car be dyno tuned in person today, solid gains for the little bit of money bill invested. Should def be a fun little street car.

My whp guess was off by .3whp

Lol

 

Agreed. It's merely a matter of time until my father decides to bite the bullet and grab some adjustable cam gears.

 

Good job d-rob.. Put a set of pro1's in that biatch and it'll probably do even better.

 

Very Nice.

Pro 1's would require valve train.

 

Ehhh that'd be a bit overcammed on an 11:1 81x87.2 gsr

 

No it wouldn't.

 

Eh, I felt my 11:1 81x87.2 gsr with a cccylinderheads ported head and pro1s was a tad overcammed, good top end, just no mid range, super late vtec and wanted to rev to the moon to make power.

It loved 12.5:1 a lot more


I'm sure this car would make more power with them tho, just sacrifice some midrange

 

bmo, each motor is different.. But for every motor that is overcammed, 4 work perfectly, i've had bone stock gsr's love pro1's and i've had stock itr's do alright..


overall pro1's would be a better choice.

 

i dont think they were looking for goobs of power given the cam selection, stock valvetrain, and the fact that its going to be a daily/female driven car. (if you read the thread)

drob, good job here. specs on the header? pics?

 

its just another RMF knock off just under a different name

 

exactly lol this is for dereks sister who i dont think even has her license yet and hasnt learned to drive stick yet.

 

Essentially, yes.

Couple small things like being a TIG-welded one-piece unit.

 

You pretty much hit the nail on the head. If they were going for more power I'm sure they would have never bothered with the blox A's.

 

Nice solid gains
Good thing you actually posted the before dyno, because the haters would eventually come through.
How did the stock bottom end look?

 

Off topic but Skunk2 Stage 1 tuner series are similar if not exact copies of those cams?

Also Drob why did you opt for the P73's why not the P30's?