I've been doing a lot of homework on K swapping my 92 Si, but it's just so dang expensive to do it right, plus my car now is a really well sorted B18 swap (sleeved, so actually a 2 liter).

I was thinking maybe spending $2-4k on turbo-ing the car would get me somewhere near what a K24A2 swap might give.

But then I realized that I think my car already has 11.5 or so compression... is that just way too high to put even a small turbo on and run just pump gas (they have 93 octane where I live)?

Anyone have any thoughts or guidance?

 

That is not an unreasonable compression ratio for boost and pump gas these days.

 

Agreed.

Also, how did you come to the conclusion that your compression would be around 11.5:1 ?

 

I remember the seller saying something to me to that effect (but like 10+ years ago, the car has been idle for a long time).

Google research indicates that a b18c5 has 11.1:1 CR (although sleeved to 2 liters, not sure if that makes any difference), but with the P72 head, which apparently adds 0.3 - 0.4 of CR since the combustion chamber is smaller than the PR3 head. This seems to corroborate what the seller had said, and puts the CR in the 11.5 ish range?

 

https://www.zealautowerks.com/bseries.html

Stock c5 is 10.8:1

C5 with C1 head is 11.04:1

83mm bore 1887cc is 11.46:1
85mm bore 1979cc is 11.89:1
86mm bore 2026cc is 12:1:1

Assuming the pistons used were the same dome volume as the stock C5 pistons.

I would bet those are not stock oversized pistons if you went to 85mm or 86mm.

 

Now I am frustrated because I cant find the paperwork that came with the car, which had all the receipts and everything. Sadly also the title...

Absent finding the paperwork, all I can do is pull the head off to check, I guess... le sigh...

Thank you for your response by the way. it's logical and well thought out.

 

Might be able to see a part number stamped on the domes of the pistons with a bore scope.

 

I just found the paperwork. apparently this is the motor:

Head:
Acura Integra GSR head
DPR Stage V headwork by Dan Paramore
Crower valve springs and titanium retainers
Skunk 2 port-matched intake manifold
Hondata intake manifold gasket
Erick's Racing 70mm throttle body
DPR camshafts
Adjustable cam gears
RC Engineering 440 fuel injectors
AEM fuel rail
SX adjustable fuel pressure regulator

Block:
Acura Integra Type R B18C5 block
85mm bore
Golden Eagle Godzilla block sleeves
11.5:1 Wiseco pistons
Eagle rods
Integra Type R crank

 

Do you have any horsepower goals once turbo? With 93/94 octane gas you should be able to get 300whp safely with a good tune and 11.5:1 compression ratio. Even if you’re at 12:1, then 300whp should be safe.
You should get an Exhaust Gas Temperature (EGT) guage also.
The 440cc/min injectors probably won’t even support 300whp so look to upgrade those if you’re going over about 275whp.

 

Hi and thx for the reply. I have more torque goals than HP. I think when last dyno'ed it made like 220hp (@9100 rpm), but only like 130 lb ft of peak torque. if I could get like 40-50 more footpounds of torque from 3500rpm on up I would be super happy, and the car would accelerate so much better out of tight corners.

Go Autoworks has recommended a GT2860RS turbo on an inlinepro SS manifold. I am currently doing my last-minute kvetching and self-doubting before placing my order

 

Could go a bit more modern with the gtx2860r and touch 400hp at the crank.